IC-M402 Service manual

SERVICE 

MANUAL 

VHF MARINE TRANSCEIVER

INTRODUCTION 

This service manual describes the latest service information 

for the IC-M402 VHF MARINE TRANSCEIVER at the time of 

publication. 

2 versions of the IC-M402 have been designed. This service 

manual covers each version. 

MODEL 

IC-M402 

VERSION 

USA 

USA-1 

SYNBOL 

BLACK 

WHITE 

To upgrade quality, anyelectrical or mechanical parts and 

internal circuits are subject to change without notice or 

obligation. 

DANGER 

NEVER connect the transceiver to an AC outlet or to a DC 

power supply that uses more than 16 V. This will ruin the 

transceiver. 

DO NOT expose the transceiver to rain, snow or any liquids. 

DO NOT reverse the polarities of the power supply when 

connecting the transceiver. 

DO NOT apply an RF signal of more than 20 dBm (100mW) 

to the antenna connector. This could damage the transceiver's 

front end. 

ORDERING PARTS 

Be sure to include the following four points when ordering 

replacement parts: 

1. 10-digit order numbers 

2. Component part number and name 

3. Equipment model name and unit name 

4. Quantity required 

 

1110003200 S.IC TA31136FN IC-M402 MAIN UNIT 5 pieces 

8810006050 Screw Icom screw E7 IC-M402 Chassis 10 pieces 

Addresses are provided on the inside back cover for your 

convenience. 

REPAIR NOTES 

1. Make sure a problem is internal before disassembling 

the transceiver. 

2. DO NOT open the transceiver until the transceiver is disconnected 

from its power source. 

3. DO NOT force any of the variable components. Turn 

them slowly and smoothly. 

4. DO NOT short any circuits or electronic parts. An insulated 

turning tool MUST be used for all adjustments. 

5. DO NOT keep power ON for a long time when the transceiver 

is defective. 

6. DO NOT transmit power into a signal generator or a 

sweep generator. 

7. ALWAYS connect a 40 dB to 50 dB attenuator between 

the transceiver and a deviation meter or spectrum analyzer 

when using such test equipment. 

8. READ the instructions of test equipment thoroughly 

before connecting equipment to the transceiver.

TABLE OF CONTENTS 

SECTION 1 SPECIFICATIONS 

SECTION 2 INSIDE VIEWS 

2-1 IC-M402 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1 

2-2 HM-127 (OPTIONAL UNIT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2 

SECTION 3 DISASSEMBLY INSTRUCTIONS 

SECTION 4 CIRCUIT DESCRIPTION 

4-1 RECEIVER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 

4-2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2 

4-3 PLL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3 

4-4 DSC CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4 

4-5 LOGIC CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4 

4-6 POWER SUPPLY CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4 

4-7 PORT ALLOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5 

SECTION 5 ADJUSTMENT PROCEDURES 

5-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 

5-2 PLL ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2 

5-3 TRANSMITTER ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3 

5-4 RECEIVER ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3 

SECTION 6 PARTS LIST 



6-3 HM-129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-7 

SECTION 7 MECHANICAL PARTS AND DISASSEMBLY 


7-2 HM-129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-3 


SECTION 8 SEMI-CONDUCTOR INFORMATION 

SECTION 9 BOARD LAYOUTS 

9-1 VR-A BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1 

9-2 VR-B BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1 

9-3 HM-129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1 

9-4 LOGIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-2 

9-5 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-4 


SECTION 10 BLOCK DIAGRAM 

SECTION 11 VOLTAGE DIAGRAM 

11-1 LOGIC BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-1 

11-2 MAIN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-2 


11-4 HM-129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-4

SECTION 1 

SPECIFICATIONS 

‘ GENERAL 

• Frequency coverage 

: 156.025–157.425 MHz (Tx) 

156.050–163.275 MHz (Rx) 

• Mode 

: 16K0G3E (FM) 

16K0G2B (DSC) 

• Usable channels 

: All USA, international and Canadian channels 

plus 10 weather channels 

• Power supply requirement 

: 13.8 V DC ±10 % (negative ground) 

• Usable temperature range 

: –20˚C to +60˚C; –4˚F to +140˚F 

• Frequency stability 

: ±10 ppm (–20˚C to +60˚C; –4˚F to +140˚F) 

• Current drain (at 13.8 V DC) : Transmit at 25 W 6.0 A (approx.) 

Receive max. audio 1.2 A (approx.) 

• Antenna impedance 

: 50 Ω (nominal) 

• Input impedance (MIC) 

• Output impedance (Audio) 

• Dimensions (projections not included) 

• Weight 

: 600 Ω 

: 4 Ω 

: 153(W)×67(H)×141.6(D) mm; 6(W)×25⁄8(H)×53⁄5(D) in 

: 900 g; 2 lb 

‘ TRANSMITTER 

• Output power (at 13.8 V DC) : High 25 W 

Low 1 W 

• Modulation 

: Variable reactance frequency modulation 

• Maximum frequency deviation : ±5.0 kHz 

• Frequency error 

: ±10 ppm 

• Spurious emissions 

: 70 dBc 

• Adjacent channel power 

: 70 dB 

• Residual modulation 

: 40 dB 

• Audio harmonic distortion 

: Less than 10% at 60% deviation 

• Audio frequency response 

: +1 dB to –3 dB of 6 dB octave from 300 Hz to 2500 Hz 

‘ RECEIVER 

• Receive system 

: Double conversion superheterodyne system 

• Intermediate frequencies : 1st 21.7 MHz 

2nd 450 kHz 

• Sensitivity 

: 0.32 µV at 12 dB SINAD 

• Squelch sensitivity : 0.32 µV 

• Adjacent channel selectivity 

: 70 dB 

• Spurious response 

: 70 dB 

• Intermodulation rejection ratio 

: 70 dB 

• Hum and noise 

: 40 dB 

• Audio output power (at 13.8 V DC) : 4.5 W typical at 10% distortion with an 4 Ω load 

• Audio frequency responce 

: +1 dB to –3 dB of –6 dB octave from 300 Hz to 3000 Hz 

Specifications are measured in accordance with TIA/EIA-603 

All stated specifications are subject to change without notice or obligation. 

1 - 1

‘ VHF MARINE CHANNEL LIST 

Channel No. Frequency (MHz) Channel No. Frequency (MHz) Channel No. Frequency (MHz) 

USA 

01A 

03A 

05A 

06 

07A 

08 

09 

10 

11 

12 

13* 2 

14 

15* 2 

16 

17* 1 

18A 

19A 

20 

20A 

INT 

01 

02 

03 

04 

05 

06 

07 

08 

09 

10 

11 

12 

13 

14 

15* 1 

16 

17 

18 

19 

20 

21 

CAN 

01 

02 

03 

04A 

05A 

06 

07A 

08 

09 

10 

11 

12 

13* 1 

14 

15* 1 

16 

17* 1 

18A 

19A 

20* 1 

21 

Transmit 

156.050 

156.050 

156.100 

156.150 

156.150 

156.200 

156.200 

156.250 

156.250 

156.300 

156.350 

156.350 

156.400 

156.450 

156.500 

156.550 

156.600 

156.650 

156.700 

156.750 

156.800 

156.850 

156.900 

156.900 

156.950 

156.950 

157.000 

157.000 

157.050 

Receive 

160.650 

156.050 

160.700 

160.750 

156.150 

160.800 

156.200 

160.850 

156.250 

156.300 

160.950 

156.350 

156.400 

156.450 

156.500 

156.550 

156.600 

156.650 

156.700 

156.750 

156.800 

156.850 

161.500 

156.900 

161.550 

156.950 

161.600 

157.000 

161.650 

USA 

21A 

22A 

23A 

24 

25 

26 

27 

28 

61A 

63A 

64A 

65A 

66A 

67* 2 

68 

69 

70* 3 

71 

72 

INT CAN 

21A 

22 

22A 

23 23 

24 24 

25 25 

26 26 

27 27 

28 28 

60 60 

61 

61A 

62 

62A 

63 

64 64 

64A 

65 

65A 65A 

66 

66A 66A* 1 

67 67 

68 68 

69 69 

70* 3 70* 3 

71 71 

72 72 

Transmit Receive 

157.050 157.050 

157.100 161.700 

157.100 157.100 

157.150 161.750 

157.150 157.150 

157.200 161.800 

157.250 161.850 

157.300 161.900 

157.350 161.950 

157.400 162.000 

156.025 160.625 

156.075 160.675 

156.075 156.075 

156.125 160.725 

156.125 156.125 

156.175 160.775 

156.175 156.175 

156.225 160.825 

156.225 156.225 

156.275 160.875 

156.275 156.275 

156.325 160.925 

156.325 156.325 

156.375 156.375 

156.425 156.425 

156.475 156.475 

156.525 156.525 

156.575 156.575 

156.625 156.625 

USA 

73 

74 

77* 1 

INT 

73 

74 

77 

78 

CAN 

73 

74 

77* 1 

Transmit 

156.675 

156.725 

156.875 

156.925 

Receive 

156.675 

156.725 

156.875 

161.525 

78A 

79 

78A 156.925 

156.975 

156.925 

161.575 

79A 

80 

79A 156.975 

157.025 

156.975 

161.625 

80A 

81 

80A 157.025 

157.075 

157.025 

161.675 

81A 

82 

81A 157.075 

157.125 

157.075 

161.725 

82A 

83A 

84 

84A 

83 

84 

82A 

83 

83A 

84 

157.125 

157.175 

157.175 

157.225 

157.225 

157.125 

161.775 

157.175 

161.825 

157.225 

85 

85A 

85 85 157.275 

157.275 

161.875 

157.275 

86 

86A 

86 86 157.325 

157.325 

161.925 

157.325 

87 

87A 

87 87 157.375 

157.375 

161.975 

157.375 

88 88 88 157.425 162.025 

88A 

157.425 157.425 

* 1 Low power only, * 2 Momentary high power, * 3 Receive only 

NOTE: Channels 3, 21, 23, 61, 64, 81, 82 and 83 CANNOT be used by the general public in USA waters. 

‘ WX CHANNEL LIST 

Weather 

channel 

Transmit 

Frequency (MHz) 

Receive 

Weather 

channel 

Transmit 

Frequency (MHz) 

Receive 

WX01 

Receive only 

162.550 

WX06 

Receive only 

162.500 

WX02 

Receive only 

162.400 

WX07 

Receive only 

162.525 

WX03 

Receive only 

162.475 

WX08 

Receive only 

161.650 

WX04 

Receive only 

162.425 

WX09 

Receive only 

161.775 

WX05 

Receive only 

162.450 

WX10 

Receive only 

163.275 

1 - 2

SECTION 2 

INSIDE VIEWS 

2-1 IC-M402 

• MAIN UNIT 

AF power amplifier 

(IC9: LA4425A) 

Pre-driver 

(Q10: 2SC3775 3) 

YGR amplifier 

(Q11: 2SC3268) 

DSC decoder 

(IC6: NJM2211M) 

Reference oscillator 

(X2: CR-659) 

Antenna switching circuit 

VCO circuit 

1st mixer 

(Q1:3SK272) 

FM IF IC 

(IC1: TA31136FN) 

2nd IF filter 

(FI3: ALFY450E) 

PLL IC 

(IC2: MPD3140GS) 

1st IF filter 

(FI1,FI2,: FL-310) 

• FRONT UNIT 

Reset IC 

(IC6: NJM2211M) 

EEPROM 

(IC2: HN58X2432TI) 

VR-A board 

MAIN MPU 

(IC1: HD6473847RH) 

Speaker 

VR-B board 

System clock 

(X1: CR-691) 

LOGIC board 

2 - 1

2-2 HM-127 (OPTIONAL UNIT) 

• TOP VIEW 

LCD 

(DS1: A0119) 

• BOTTOM VIEW 

System clock 

(X1: CSTCC4.91MG) 

CPU 

(IC1: µPD789405AGK-A30-9EU) 

Data buffer circuit 

Dimmer circuit 

Reset IC 

(IC7: S-80928ANMP) 

5V regulator 

(IC5: TA78L05F) 

8V regulator 

(IC6: TA7808F) 

Volume IC 

(IC3: M62429FP) 

AF/MIC switch 

(IC9: TC4W53FU) 

MIC amplifier 

(IC4: NJM2125F) 

AF amplifier 

(IC2: TA7368F) 

2 - 2

SECTION 3 

DISASSEMBLY INSTRUCTIONS 

• REMOVING THE CASE 

1 Unscrew 6 screws, A. 

Note: When replacing the screw, 10–12 kg of torque MUST 

be applied to ensure water resistance. 

• REMOVING THE MAIN UNIT 

1 Unsolder DC cable (4 points) and antenna connector, 

B (2 points), as shown below. 

2 Unscrew 2 screws, C, and 6 screws, D, to remove the 

MAIN unit. 

C 

B 

D 

A 

2 Slide the case free of the chassis in the direction of the 

arrow. 

3 - 1

SECTION 4 

CIRCUIT DESCRIPTION 

4-1 RECEIVER CIRCUITS 

4-1-1 ANTENNA SWITCHING CIRCUIT 

(MAIN UNIT) 

The antenna switching circuit functions as a low-pass filter 

while receiving and as resonator circuit while transmitting. 

The circuit does not allow transmit signals to enter receiver 

circuits. 

Received signals enter the MAIN unit from the antenna connector 

and pass through the low-pass filter (L13, L14, 

C106–C109, C111). The signals are then applied to the RF 

circuit via the antenna switching circuit (D15, L15, C197, 

C198). 

4-1-2 RF CIRCUIT (MAIN UNIT) 

The RF circuit amplifies signals within the range of frequency 

coverage and filters out-of-band signals. 

The signals from the antenna switching circuit pass through 

a tunable bandpass filter (D19, L16, L17, L19, L20, 

C199–C204, C206–C210) where the object signals are led 

to the RF amplifier circuit (Q27). 

The amplified signals at Q7 are applied to the 3-stage tunable 

bandpass filter (D20, L21, L22, L24, L25, C213–C218, 

C220–C224) to suppress unwanted signals and improve the 

selectivity. The signals are then applied to the 1st mixer circuit. 

4-1-3 1ST MIXER AND 1ST IF CIRCUITS 

(MAIN UNIT) 

The 1st mixer circuit converts the received signal to a fixed 

frequency of the 1st IF signal with a 1st LO (VCO output) frequency. 

By changing the 1st LO frequency, only the desired 

frequency will be passed through two crystal filters at the 

next stage of the mixer. 

The signals from the RF circuit are mixed with the VCO signals 

at the 1st mixer circuit (Q1) to produce a 21.7 MHz 1st 

IF signal. 

The 1st IF signal is applied to two crystal filters (FI1, FI2) to 

suppress out-of-band signals and is then amplified at the IF 

amplifier (Q2). The amplified signal is applied to the 2nd 

mixer circuit (IC1). 

4-1-4 2ND IF AND DEMODULATOR CIRCUITS 

(MAIN UNIT) 

The 2nd mixer circuit converts the 1st IF signal to a 2nd IF 

signal. A double superheterodyne system (which converts 

receive signals twice) improves the image rejection ratio and 

obtains stable receiver gain. 

The FM IF IC (IC1) contains the 2nd local oscillator, 2nd 

mixer, limiter amplifier, quadrature detector, and noise 

detector circuits, etc. 

The 1st IF signal from Q2 is applied to the 2nd mixer section 

of IC1 (pin 16), and is mixed with a 21.25 MHz 2nd LO signal 

generated at the PLL circuit using the reference frequency 

(21.25 MHz) to produce a 450 kHz 2nd IF signal. 

The 2nd IF signal from IC1 (pin 3) is passed through the 

ceramic filter (FI3), where unwanted signals are suppressed, 

and is then applied to the 2nd IF (limiter) amplifier 

in IC1 (pin 5). The signal is applied to the FM detector section 

in IC1 for demodulation into AF signals. 

The FM detector circuit employs a quadrature detection 

method (linear phase detection), which uses a ceramic discriminator 

(X1) for phase delay to obtain a non-adjusting circuit. 

The detected signal from IC1 (pin 9) is applied to the AF 

circuit. 

• 2ND IF AND DEMODULATOR CIRCUITS 

Squelch level 

adjustment pot 

(R16) 

C26 

AF signal "DET" 

C25 

R17 

R18 

R15 

Active 

filter 

FM 

detector 

C24 

C28 C27 R19 

2nd IF filter 

450 kHz 

FI2 

8 R20 7 5 3 

9 

10 

X1 

Noise 

detector 

Limiter 

amp. 

11 

C20 

R14 

R21 

RSSI 

13 

R5 

Mixer 

(21.25 MHz) 

2 

17 16 

PLL IC 

IC3 

X2 

21.25 MHz 

IC2 TA31136F 

16 

1st IF (21.7 MHz) 

from the IF amplifier (Q2) 

"SQL" signal to the CPU 

(LOGIC board; IC1,pin 90) 

4 - 1

4-1-5 AF AMPLIFIER CIRCUIT 

(MAIN AND FRONT UNITS) 

The AF amplifier circuit amplifies the detected signals to 

drive a speaker. The AF circuit includes an AF mute circuit 

for the squelch. 

AF signals from IC1 (pin 9) are applied to the de-emphasis 

circuit (R101, C140). The de-emphasis circuit is an integrated 

circuit with frequency characteristic of –6 dB/octave. 

The integrated signals pass through the high-pass filter 

(Q21, R96–R100, C138, C139) to suppress unwanted lower 

noise signals. 

The filtered signals are applied to the AF mute circuit (IC5A), 

and then passes through the [VOLUME] control (VR-A 

board; R1) via the “VOL1” signal. The signals are applied to 

the AF power amplifier (IC9, pin 1). The output signal from 

IC9 (pin4) drives the internal (external) speaker. 

4-1-6 SQUELCH CIRCUIT 

(MAIN UNIT AND LOGIC BOARD) 

A squelch circuit cuts out AF signals when no RF signals are 

received. By detecting noise components in the AF signals, 

the squelch circuit switches the AF mute switch. 

A portion of the AF signals from the FM IF IC (IC1, pin 9) 

pass through the squelch adjustment pot (R16), and are 

then applied to the active filter section (IC1, pin 8). The 

active filter section amplifies and filters noise components. 

The filtered signals are applied to the noise detector section 

and output from pin 14 as the “SQL” signal. The “SQL” signal 

is applied to the CPU (LOGIC board; IC1, pin 90). The 

CPU analyzes the noise condition and outputs the “RMUM”, 

“RMUTS” signals to toggle the AF mute switches (IC5A, 

IC5B). 

4-1-7 WEATHER ALERT DECODER CIRCUIT 


When the weather alert function is activated and a 1050 Hz 

alert tone from an NOAA weather radio broadcast is 

received, the IC-M402 emits beep tones and indicates flashing 

“ALT” on the display to inform of an emergency weather 

report on the air. 

AF signals from the FM IF IC (IC1, pin 9) pass through the 

low-pass filter (Q28) via the “DET” signal, and are then 

applied to A/D port of the CPU (LOGIC board; IC1, pin 88) 

as “WXDEC” signal. The CPU has the tone decoder function. 

When a 1050 Hz signal is detected by software decode, 

the CPU (LOGIC unit; IC1) controls beep tones and the 

“ALT” indicator. 

4-2 TRANSMITTER CIRCUITS 

4-2-1 MICROPHONE AMPLIFIER CIRCUIT 

(MAIN UNIT) 

The microphone amplifier circuit amplifies audio signals with 

+6 dB/octave pre-emphasis from the microphone to a level 

needed at the modulation circuit. 

The AF signals from the microphone are amplified at the 

microphone amplifier (IC7B) via the analog switch (IC4A, pin 

1). A capacitor (C159) and resistor (R121) are connected to 

the amplifier to obtain the pre-emphasis characteristics. 

The amplified signals are applied to the IDC amplifier (IC7C, 

pin 9) and are passed through the splatter filter (IC7D) to 

suppress unwanted 3 kHz or higher signals. The filtered signals 

are then applied to the modulation circuit. 

4-2-2 MODULATION CIRCUIT (MAIN UNIT) 

The modulation circuit modulates the VCO oscillating signal 

(RF signal) using the microphone audio signals. 

Audio signals from the splatter filter (IC7D) pass through the 

frequency deviation adjustment pot (R138) and are then 

applied to the modulation circuit (D2, D3, D4) to change the 

reactance of D2, D3, D4 and modulate the oscillated signal 

at the VCO (Q5, Q6). 

4-2-3 DRIVE AMPLIFIER CIRCUIT (MAIN UNIT) 

The drive amplifier circuit amplifies the VCO oscillating signal 

to a level needed at the power amplifier. 

The VCO output is buffer-amplified by Q7 and Q9, and is 

then applied to the Tx/Rx switch (D6). The transmit signal 

from the Tx/Rx switch is amplified to the pre-drive (Q10) and 

YGR (Q11) amplifiers to obtain an approximate 300 mW signal 

level. The amplified signal is then applied to the RF 

power amplifier (IC3). 

4-2-4 POWER AMPLIFIER CIRCUIT (MAIN UNIT) 

The power amplifier circuit amplifies the driver signal to an 

output power level. 

IC3 is a power module which has amplification output capabilities 

of about 35 W with 300 mW input. The output from 

IC3 (pin 4) is passed through the antenna switching circuit 

(D10) and is then applied to the antenna connector via the 

low-pass filter. 

• AF AMPLIFIER CIRCUIT 

External SP 

HVS 

PWR 

AMP 


(VR-A board) 

AF 

MUTE 

HPF 

de-emphasis 

circuit 

R101 

C140 

"DET" signal from the 

FM IF IC (IC1, pin 9) 

Internal SP 

(LOGIC board) 

4 - 2

4-2-5 APC CIRCUIT (MAIN UNIT) 

The APC circuit stabilizes transmit output power. 

The RF output signal from the power amplifier (IC3) is 

detected at the power detector circuit (D8, D9, L12) and is 

then applied to one of the differential amplifier inputs (Q15, 

pin 5) via the High/Low control circuit (R71, Q16). The 

applied voltage controls the differential amplifier output 

(Q15, pin 2) and the bias voltage control (Q12). Thus the 

APC circuit maintains a constant output power. 

4-3 PLL CIRCUITS 

4-3-1 GENERAL 

The PLL circuit provides stable oscillation of the transmit frequency 

and receive 1st LO frequency. The PLL circuit compares 

the phase of the divided VCO frequency to the reference 

frequency. The PLL output frequency is controlled by a 

crystal oscillator and the divided ratio of the programmable 

divider. 

IC2 on the MAIN unit is a dual PLL IC which controls both 

VCO circuits for Tx and Rx, and contains a prescaler, programmable 

counter, programmable divider, phase detector, 

charge pump, etc. 

The PLL circuit , using a one chip PLL IC (MAIN unit; IC2), 

directly generates the transmit frequency and receive 1st IF 

frequency with VCOs. The PLL sets the divided ratio based 

on serial data from the CPU on the LOGIC unit and compares 

the phases of VCO signals with the reference oscillator 

frequency. The PLL IC detects the out-of-step phase and 

output from pins 8 for Tx and Rx. The reference frequency 

(21.25 MHz) is oscillated at X2 (MAIN unit). 

4-3-2 TX AND RX LOOP (MAIN UNIT) 

The generated signal at the VCO (Q4, Q5, Q6, D1–D4) 

enters the PLL IC (IC2, pin 2) and is divided at the programmable 

divider section and is then applied to the phase 

detector section. 

The phase detector compares the input signal with a reference 

frequency, and then outputs the out-of-phase signal 

(pulse-type signal) from pin 8. 

The pulse-type signal is converted into DC voltage (lock 

voltage) at the loop filter (R29–R31, R41, C41, C42, C50, 

C51), and is then applied to varactor diodes (D3, D4) of the 

VCO to stabilize the oscillated frequency. The lock voltage 

from the loop filter is amplified at the buffer amplifier (Q7) 

and then applied to the RF circuit. 

• APC CIRCUIT 

RF signal 

from PLL 

Q11 

YGR 

amp. 

1 

Power module 


2 3 

4 

RF detector 

circuit 

D8 

L12 

D9 

to antenna 

"TMUT" signal from the CPU 

(LOGIC board; IC1, pin 83) 

Q14 

Q12 

Q15 

APC control circuit 

HV 

R70 

R69 

T5 

R71 

R73 

C93 

Q16 

"TXDET" signal to the CPU 

(LOGIC board; IC1, pin 92) 

R74 

HI/LO 

• PLL CIRCUIT 

VCO 

Q4 Q6, D1 D4 

Buffer 

Q7 

Buffer 

Q9 

Buffer 

D6 

D5 

to transmitter circuit 

to 1st mixer circuit 

Q8 

Loop 

filter 

IC2 (PLL IC) 

8 Phase Programmable 

2 

Prescaler 

detector counter 

21.25 MHz signal to the 

3 

FM IF IC (IC1, pin 2) 17 Programmable 

Shift register 

4 

divider 

5 

X2 

16 

21.25 MHz 

PSTB 

PCK 

PDATA 

4 - 3

4-3-4 VCO CIRCUIT (MAIN UNIT) 

The VCO outputs from Q4–Q6 are buffer-amplified at the 

buffer amplifiers (Q7 and Q9), and are then sent to the Tx/Rx 

switch (D5 and D6). The receive LO signal is applied to the 

1st mixer circuit (Q1) through a low-pass filter, and the transmit 

signal is applied to the pre-drive amplifier (Q10). A portion 

of the VCO output is reapplied to the PLL IC (IC2, pin 2) 

via the buffer amplifier (Q8). 

4-4 DSC CIRCUITS 

4-4-1 DSC ENCODE CIRCUIT 

(LOGIC BOARD AND MAIN UNIT) 

The DSC signal created at CPU (IC1), is passed through the 

buffer amplifier (Q8), and applied to the D/A convertor 

(R55–R73) to convert into the analog signal. The analog signal 

passes through the low-pass filter (MAIN unit; IC7D), 

and is then applied to the VCO circuit to modulate the DSC 

signal. 

4-4-2 DSC DECODE CIRCUIT 


The AF signal from the FM IF IC (IC1, pin 9) are filtered at 

the low-pass filter (Q28) to suppress unwanted higher noise 

signals. The filtered signals are converted analog signals 

into digital signals at the DSC decoder IC (IC6), and are then 

applied to the CPU (LOGIC board; IC1, pin 18). 

4-6 POWER SUPPLY CIRCUITS 

LINE 

HV 

HVS 

VCC 

5V 

T5 

R5 

DESCRIPTION 

The voltage from the connected DC power supply. 

Same voltage as the HV line which is passed 

through the [PWR] switch (VR-A board; R1). 

Same voltage as the HVS line. The voltage is 

applied to the optional microphone (HM-127). 

Common 5 V converted from the HVS line at the 

5V regulator circuit (MAIN unit; IC8). 

Transmit 5 V controlled by the 5V control circuit 

(MAIN unit; Q24, Q25) using the SEND signal 

from CPU (LOGIC board; IC1). The controlled 

voltage is applied to the transmitter circuit. 

Receive 5 V controlled by the R5 control circuit 

(MAIN unit; Q22, Q23) using the RCV circuit 

from CPU (LOGIC board; IC1). The controlled 

voltage is applied to the receiver circuit. 

4-5 LOGIC CIRCUITS (LOGIC BOARD) 

• CPU 

IC1 is an 8 bit signal chip micro-computer and contains LCD 

driver, serial I/O, timer, A/D converter, programmable I/O, 

ROM and RAM. 

• SYSTEM CLOCK CIRCUIT 

X1 is a ceramic oscillator and ocillate 9.8304 MHz system 

clock for the CPU (IC1). 

• RESET CIRCUIT 

IC6 is a reset IC. When turn power ON, IC6 outputs a reset 

signal (“LOW” pulse) to the CPU (IC1, pin 15) via the “RES” 

line. 

• LOW BATTERY DETECTOR 

HVS voltage is divided by R74, R75 and is applied to the low 

battery detector section in the CPU (IC1, pin 91) via the 

“LBAT” line. 

• DIMMER CIRCUIT 

CPU (IC1), Q2, Q3 and Q4 are dimmer circuit and control 

the 4 steps the LCD backlight (DS3–DS8). 

4 - 4

4-7 PORT ALLOCATIONS 

4-7-1 CPU (LOGIC BOARD; IC1) 

Pin 

number 

1 

2 

3 

5 

6 

7 

8 

16 

17 

18 

20 

21 

22 

23 

27 

28 

29 

31 

83 

84 

88 

89 

90 

91 

Port 

name 

CONT1 

CONT2 

BEEP 

CH16 

CHWX 

H/L 

DSDEC 

PCK 

PSTB 

PDATA 

ICFC 

BPLVL 

ECK 

EDA 

HI/LO 

RRXD 

RRXD 

BPFV 

TMUT 

NMEAI 

WXDEC 

SQLV 

SQL 

LBAT 

Description 

Outputs control signal for the LCD 

contrast. 

CONT1 CONT2 CONTRAST 

0 0 LIGHT 

1 1 DEEP 

Outputs beep audio signal. 

Input port for the CH16 switch. 

Low: While CH16 switch is pushed. 

Input port for the CHWX switch. 

Low: While CHWX switch is pushed. 

Input port for the H/L switch. 

Low: While H/L switch is pushed. 

Input port for ATIS/DSC decode signal. 

Outputs clock signal to the PLL IC 

(MAIN unit; IC2, pin 4). 

Outputs strobe signals to the PLL IC 


Outputs data signals to the PLL IC 


Outputs control signal to swtich NMEA 

or ICF3 (Optional unit; HM-127). 

Outputs beep volume control signal. 

Low: Beep audio is maximum. 

Outputs clock signal for the EEPROM 

(IC2, pin 6). 

I/O port for the EEPROM data signals. 

Output port for RF output power (High 

or Low) select signal. 

Input port for the communication data 

from HM-127. 

Outputs communication data to HM- 

127. 

Outputs bandpass filter select signals. 

Low: Receiving more than 160 MHz. 

High: Receiving less than 160 MHz. 

Outputs transmit mute signal. 

High: While transmitting. 

Input port for GGA and NMEA data. 

Input port for WX alert signal. 

Input port for the squelch volume 

level. 

Input port from the FM IF IC (MAIN 

unit; IC1) for the squelch operation. 

Input port for the connected power 

supply voltage detection (low battery 

indicator). 

Pin 

number 

92 

93 

94 

95 

96 

97 

98 

99 

Pin 

number 

4 

5 

6 

7 

11 

12 

13 

14 

Port 

name 

TXDET 

KEYM 

PTT 

DTRS 

DSC 

UP 

DOWN 

UNLK 

Port 

name 

RMUTM 

RMUTS 

PTTM 

PTTS 

MMUTE 

SMUTE 

SEND 

RCV 

Description 

Input port for TX LED control signal. 

Input port for the smart mic functions. 

2.02 V: [UP] is pushed. 

3.00 V: [DN]] is pushed. 

3.84 V: [16/9] is pushed. 

Input port for the PTT switch from HM- 

129. 

Low: While PTT is pushed. 

Input port for the DTRS switch. 

Low: While DISTRESS switch is 

pushed. 

Input port for the DSC switch. 

Low: While DSC switch is pushed. 

Input port for the UP switch. 

Low: While UP switch is pushed. 

Input port for the DOWN switch. 

Low: While DOWN switch is pushed. 

Input port for the PLL unlock signal. 

Low: While PLL is locked. 

4-7-2 I/O EXPANDER IC (LOGIC BOARD; IC3) 

Description 

Outputs the AF mute swtich (MAIN 

unit; IC5) control signal for main body. 

Low: While squelched 

Outputs the AF mute swtich (MAIN 

unit; IC5) control signal for the optional 

remote microphone (HM-127). 

Low: While squelched 

Outputs main microphone (HM-129) 

select signal to the analog swtich 

(IC4) while intercom operation. 

Outputs optional microphone (HM- 

127) select signal to the analog swtich 

(IC4) while intercom operation. 

Outputs select signal for the speaker 

of the main microphone (HM-129) to 

the analog swtich (IC5) while intercom 

operation. 

Outputs select signal for the speaker 

of the optional microphone (HM-127) 

to the analog swtich (IC5) while intercom 

operation. 

Outputs the T5 regulator (MAIN unit; 

Q24, Q25) control signal. 

High: While transmitting 

Outputs the R5 regulator (MAIN unit; 

Q22, Q23) control signal. 

High: While receiving. 

4 - 5

SECTION 5 

ADJUSTMENT PROCEDURES 

5-1 PREPARATION 

■ REQUIRED TEST EQUIPMENT 

EQUIPMENT 

DC power supply 

RF power meter 

(terminated type) 

Frequency counter 

FM deviation meter 

DC voltmeter 

Digital multi-meter 

Distortion meter 

‘ CONNECTIONS 

GRADE AND RANGE 

Output voltage : 13.8 V DC 

Current capacity : 10 A or more 

Measuring range : 1–50 W 

Frequency range : 100–300 MHz 

Impedance : 50 Ω 

SWR : Less than 1.2 : 1 

Frequency range : 0.1–300 MHz 

Frequency accuracy : ±1 ppm or better 

Sensitivity : 100 mV or better 

Frequency range : 30–300 MHz 

Measuring range : 0 to ±10 kHz 

Input impedance : 50 kΩ/V DC or better 

Input impedance : 10 MΩ/V DC or better 

Frequency range : 1 kHz ±10 % 

Measuring range : 1–100 % 

EQUIPMENT 

Audio generator 

Standard signal 

generator (SSG) 

Oscilloscope 

AC millivoltmeter 

External speaker 

Attenuator 

Dummy load 

Frequency range 

Measuring range 


Output level 




Input impedance 

Capacity 

Power attenuation 

Capacity 

Resistance 

Capacity 

GRADE AND RANGE 

: 300–3000 Hz 

: 1–500 mV 

: 0.1–300 MHz 

: 0.1 µV–32 mV 

(–127 to –17 dBm) 

: DC–20 MHz 

: 0.01–20 V 

: 10 mV–10 V 

: 4 Ω 

: 5 W or more 

: 40 or 50 dB 

: 50 W or more 

: 50 Ω 

: 100 W or more 

Standard signal 

generator 

17 to 125 dBm 

(32 mV to 0.13 V) 

RF power meter 

50 / 1 50 W 

CAUTION: 

DO NOT transmit while SSG is 

connected to the antenna connector. 

to DC cable 

+ 

DC power supply 

13.8 V /15 A 

Frequency 

counter 

FM deviation 

meter 

Attenuator 

40 dB or 50 dB 

to the antenna connector 

Red line 

Black line 

to EXT Speaker 

Red cap 

(EXT SP jack) 

Distortion meter 

Speaker 

5 - 1

5-2 PLL ADJUSTMENTS 

ADJUSTMENT 

LOCK 

VOLTAGE 

REFERENCE 

FREQUENCY 

1 

2 

1 

ADJUSTMENT CONDITION 

• Operating channel : ch16 

• Receiving 


• Output power : Low 

• Transmitting 



• Connect an RF power meter or a 

50 Ω dummy load to the antenna 

connector. 


ADJUSTMENT 

MEASUREMENT 

VALUE 

POINT 

UNIT LOCATION UNIT ADJUST 

MAIN 

Rear 

Panel 

Connect a digital 

multi-meter or oscilloscope 

to the 

check point CP1. 

Loosely couple the 

frequency counter 

to the antenna connector. 

1.8 V 

1.6 V 

156.8000 MHz MAIN 

Verify 

C36 

C36 

Reference frequency 

adjustment 

CP1 

PLL lock voltage 

check point 

5 - 2

5-3 TRANSMITTER ADJUSTMENTS 

ADJUSTMENT 

OUTPUT 

POWER 

FREQUENCY 

DEVIATION 

1 

1 



• Output power : High 




• Connect an audio generator to J4 

(pin 3) on the MAIN unit with an 

AC millivoltmeter and set as: 

Frequency : 1 kHz 

Level 

: 45 mV 

• Set an FM deviation meter as: 

HPF 

: OFF 

LPF 

: 20 kHz 

De-emphasis : OFF 

Detector : (P–P)/2 


ADJUSTMENT 

MEASUREMENT 

VALUE 

POINT 


Rear 

Panel 

Rear 

Panel 

Connect an RF 

power meter to the 

antenna connector. 

Connect an FM 

deviation meter to 

the antenna connector 

through an 

attenuator. 

26 W 

±4.3 kHz 

MAIN 

MAIN 

R71 

R138 

5-4 RECEIVER ADJUSTMENTS 

ADJUSTMENT 

SENSITIVITY 

SQUELCH 

1 

1 



• [SQUELCH] control: 

Max. counterclockwise 

• Connect an SSG to the antenna 

connector and set as: 

Frequency : 156.800 MHz 

Level : 100 µV* 

(–67 dBm) 

Modulation : 1 kHz 

Deviation : ±3.5 kHz 

• Receiving 


• [SQUELCH] control: 

Max. counterclockwise 

• Connect an SSG to the antenna 

connector and set as: 

Frequency : 156.800 MHz 

Level : 0.22 µV* 

(–120 dBm) 

Modulation : 1 kHz 

Deviation : ±3.5 kHz 

• Receiving 

ADJUSTMENT 

MEASUREMENT 

VALUE 

POINT 


MAIN 

MAIN 

Connect the distortion 

meter to the 

[EXT SP] jack with a 

4 Ω load. 

Connect a DC voltmeter 

to the check 

point CP2. 

*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit. 

Less than 0.32 µV 

1.0 V MAIN 

Verify 

R16, 

5 - 3

R71 

Output power 

adjustment 

R138 

Frequency deviation 

adjustment 

R16 

Squelch level 

adjustment 

CP2 

Squelch level 

check point 

J2 

1 

4 

r 

q 

Audio generator 

300 Hz to 3 kHz 

+ 

[PTT] 

AC millivoltmeter 

2 200 mV 

+ 

5 - 4

SECTION 6 

PARTS LIST 


[LOGIC BOARD] 

REF 

NO. 

ORDER 

NO. 

DESCRIPTION 

IC1 1140009410 S.IC HD6433847RA29H (FX-2438A) 

IC2 1130009680 S.IC HN58X2432TI 

IC3 1130007570 S.IC BU4094BCFV-E2 

IC4 1130005290 S.IC TC74HC14AF 

IC5 1130006080 S.IC TC74HC02AF (TP1) 

IC6 1130009110 S.IC S-80942ANMP-DD6-T2 

IC7 1170000350 S.IC PC357N6T 

Q1 1590000720 S.TRANSISTOR DTA144EUA T106 

Q2 1530002850 S.TRANSISTOR 2SC4116-BL (TE85R) 

Q3 1520000460 S.TRANSISTOR 2SB1132 T100 R 


Q5 1530002060 S.TRANSISTOR 2SC4081 T107 R 

Q6 1590000680 S.TRANSISTOR DTC114EUA T106 

Q7 1510000510 S.TRANSISTOR 2SA1576A T106R 

Q8 1560000810 S.FET 2SK1069-4-TL 


Q10 1560000810 S.FET 2SK1069-4-TL 

Q11 1560000810 S.FET 2SK1069-4-TL 

D1 1750000550 S.DIODE 1SS355 TE-17 

D2 1750000550 S.DIODE 1SS355 TE-17 

X1 6050011090 S.XTAL CR-691 (9.8304 MHz) 


REF 

NO. 

ORDER 

NO. 

DESCRIPTION 

R61 7030003560 S.RESISTOR ERJ3GEYJ 103 V (10 kΩ) 










R71 7030003490 S.RESISTOR ERJ3GEYJ 272 V (2.7 kΩ) 






R77 7030003280 S.RESISTOR ERJ3GEYJ 470 V (47 Ω) 

















R7 7030003800 S.RESISTOR ERJ3GEYJ 105 V (1 MΩ) 







































C1 4030006860 S.CERAMIC C1608 JB 1H 102K-T-A 






C7 4030006900 S.CERAMIC C1608 JB 1E 103K-T-A 

C8 4510004630 S.ELECTROLYTIC ECEV1CA100SR 


C10 4030008890 S.CERAMIC C1608 JB 1C 273K-T-A 










C24 4030007060 S.CERAMIC C1608 CH 1H 270J-T-A 





C29 4510005860 S.ELECTROLYTIC ECEV1HA2R2SR 




J1 

J2 

J3 

J4 

6510015540 S.CONNECTOR B4B-ZR-SM3-TF 

6510018960 S.CONNECTOR B2B-PH-SM3-TB 


6510022470 S.CONNECTOR 40FLT-SM1-TB 

DS1 5030001950 LCD TTR5341 

DS3 5040002310 S.LED SML-311YTT86 

DS4 5040002310 S.LED SML-311YTT86 

DS5 5040002310 S.LED SML-311YTT86 

DS6 5040002310 S.LED SML-311YTT86 

DS7 5040002660 S.LED FY1101F-TR (LED) 


S.=Surface mount 

6 - 1


REF 

NO. 

ORDER 

NO. 

EP1 0910053453 PCB B 5584C 

EP2 8930054970 LCD CONTACT SRCN-2438-SP-N-W 

[VR-A BOARD] 

REF 

NO. 

ORDER 

NO. 

R1 7210002350 VARIABLE TP96N97N15F-10KA-1301 

W1 8900010510 CABLE OPC-1044 

EP1 0910053462 PCB B 5585B 

DESCRIPTION 

DESCRIPTION 

[MAIN UNIT] 

REF 

NO. 

ORDER 

NO. 

DESCRIPTION 

D1 1790000620 S.DIODE MA77 (TX) 

D2 1790000620 S.DIODE MA77 (TX) 

D3 1720000370 S.VARICAP HVU350TRF 

D4 1720000370 S.VARICAP HVU350TRF 

D5 1790000620 S.DIODE MA77 (TX) 

D6 1790000620 S.DIODE MA77 (TX) 

D7 1750000550 S.DIODE 1SS355 TE-17 

D8 1790000690 S.DIODE HSM88ASR-TR 

D9 1790000690 S.DIODE HSM88ASR-TR 

D10 1710001080 DIODE XB15A308 

D11 1790000700 DIODE DSA3A1 

D12 1750000550 S.DIODE 1SS355 TE-17 

D14 1750000130 S.DIODE DA204U T107 

D15 1710001080 DIODE XB15A308 

D16 1790001210 S.DIODE 1SS375-TL 

D19 1790000620 S.DIODE MA77 (TX) 

D20 1790000620 S.DIODE MA77 (TX) 

D21 1790000660 S.DIODE MA728 (TX) 

FI1 2010002420 MONOLITH 21R15AB (FL-310) 

FI2 2010002420 MONOLITH 21R15AB (FL-310) 

FI3 2020001680 CERAMIC ALFY450E 

[VR-B BOARD] 

REF 

NO. 

ORDER 

NO. 

R1 7210002360 VARIABLE TP96N97-15F-10KB-1301 

EP1 0910053472 PCB B 5586B 

[MAIN UNIT] 

REF 

NO. 

ORDER 

NO. 

DESCRIPTION 

DESCRIPTION 

IC1 1110003200 S.IC TA31136FN (EL) 

IC2 1130007610 S.IC µPD3140GS-E1 (DS8) 

IC3 1150001540 IC M57710-A/SC-1302 



IC6 1110003650 S.IC NJM2211M-TE1 

IC7 1110002680 S.IC NJM2902M-T1 

IC8 1180001070 S.IC TA7805F (TE16L) 

IC9 1110003090 IC LA4425A 

Q1 1580000660 S.FET 3SK272-(TX) 

Q2 1530002360 S.TRANSISTOR 2SC2714-Y (TE85R) 



Q5 1530002920 S.TRANSISTOR 2SC4226-T2 R25 


Q7 1530002600 S.TRANSISTOR 2SC4215-O (TE85R) 



Q10 1530002240 S.TRANSISTOR 2SC3775-3-TB 

Q11 1530003710 S.TRANSISTOR 2SC3268 (TE12L) 

Q12 1520000380 TRANSISTOR 2SB1143 S 


Q15 1590000670 S.TRANSISTOR FMW1 T148 


Q17 1540000550 S.TRANSISTOR 2SD1664 T100Q 



Q20 1560000810 S.FET 2SK1069-4-TL 


Q22 1510000670 S.TRANSISTOR 2SA1588-GR (TE85R) 


Q24 1510000670 S.TRANSISTOR 2SA1588-GR (TE85R) 





X1 6070000210 S.DISCRIMINATOR CDBCA450CX24 

X2 6050010800 S.XTAL CR-659 (21.25 MHz) 

L1 6200003050 S.COIL NL 322522T-R82J-3 

L2 6200002410 S.COIL NL 252018T-056J 

L3 6200002430 S.COIL NL 252018T-082J 

L4 6200003090 S.COIL NL 322522T-2R7J-3 

L5 6200008190 S.COIL 0.25-1.9-8TL 80N 

L6 6200009180 S.COIL ELJRE R10J-F3 



L9 6200002430 S.COIL NL 252018T-082J 

L10 6200002430 S.COIL NL 252018T-082J 

L11 6170000230 COIL LW-25 

L12 6110001600 COIL LA-243 

L13 6110001600 COIL LA-243 

L14 6110001670 COIL LA-253 

L15 6110001600 COIL LA-243 

L16 6200007760 S.COIL LQN21A 82NJ04 

L17 6200007760 S.COIL LQN21A 82NJ04 

L19 6200007760 S.COIL LQN21A 82NJ04 

L20 6200007760 S.COIL LQN21A 82NJ04 

L21 6200007760 S.COIL LQN21A 82NJ04 

L22 6200007760 S.COIL LQN21A 82NJ04 

L24 6200007760 S.COIL LQN21A 82NJ04 

L25 6200007760 S.COIL LQN21A 82NJ04 

L26 6200004720 S.COIL MLF1608D R10K-T 

L27 6200003550 S.COIL MLF1608A 4R7K-T 

L28 6200009150 S.COIL ELJRE 82NJ-F3 

L29 6200009170 S.COIL ELJRE 47NJ-F2 

L30 6200002600 S.COIL NL 252018T-047J 

L31 6200002600 S.COIL NL 252018T-047J 













R16 7310002760 S.TRIMMER RV-152 (RH03A3AJ4X0HA) 223 

R17 7510001050 S.THERMISTOR NTCCM1608 4LH 333KC-T 










6 - 2

[MAIN UNIT] 

REF ORDER 

NO. NO. 

DESCRIPTION 



































R63 7030000960 S.RESISTOR MCR18EZHJ 33 Ω 

R64 7030000960 S.RESISTOR MCR18EZHJ 33 Ω 







R71 7310002670 S.TRIMMER RV-143 (RH03A3AS2) 471 



R75 7030000240 S.RESISTOR MCR10EZHJ 68 Ω (680) 





































[MAIN UNIT] 

REF 

NO. 

ORDER 

NO. 

DESCRIPTION 

















R135 7510001150 S.THERMISTOR NTCCM1608 4BH 103KC 



R138 7310002600 S.TRIMMER RV-110 (RH03A3AS4X0AA) 473 






R144 7030001070 S.RESISTOR MCR50JZHJ 33 Ω (330) 









R154 7030000100 S.RESISTOR MCR10EZHJ 4.7 Ω (4R7) 



































C9 4030007010 S.CERAMIC C1608 CH 1H 100D-T-A 




C14 4030011770 S.CERAMIC C1608 CH 1H 060B-T-A 




C19 4030011810 S.CERAMIC C1608 JB 1A 224K-T-N 




6 - 3

[MAIN UNIT] 

REF ORDER 

NO. NO. 

DESCRIPTION 









C30 4030011600 S.CERAMIC C1608 JB 1C 104KT-N 






C36 4610001590 S.TRIMMER TZC03R100A110 10P 





C41 4550006810 S.TANTALUM ECST1VY473R 

C42 4550006560 S.TANTALUM ECST1CY225R 








C50 4550006360 S.TANTALUM ECST1VY104R 




C54 4030009540 S.CERAMIC C1608 CH 1H 1R5B-T-A 

























C80 4510007630 ELECTROLYTIC 35 MV 47 CA 



C83 4510004600 ELECTROLYTIC 16 MV 1000 HC 

C84 4510004440 S.ELECTROLYTIC ECEV1HA010SR 


















C102 4010008530 CERAMIC HM74SJ CH 360J 500V 



[MAIN UNIT] 

REF 

NO. 

ORDER 

NO. 

DESCRIPTION 


C106 4010005790 CERAMIC HM60SJ YB 102K 500V 


C108 4010005430 CERAMIC HM60SJ CH 050C 500V 


C111 4010005420 CERAMIC HM60SJ CH 040C 500V 




































C149 4340000020 S.MYLAR ECWU 1C 333JB5 
















C171 4510006220 S.ELECTROLYTIC ECEV1CA101UP 


























6 - 4

[MAIN UNIT] 

REF ORDER 

NO. NO. 

DESCRIPTION 

























































C272 4550006700 S.TANTALUM ECST1AY106R 






[FRONT UNIT] 

REF 

NO. 

ORDER 

NO. 

DESCRIPTION 

MC1 0800005970 MICROPHONE HM-129B ACC 

MC1 0800005980 MICROPHONE HM-129W ACC 

SP1 2510001110 SPEAKER 045P1601 

W1 7120000470 JUMPER ERDS2T0 


W3 8900010500 CABLE OPC-1046 

J2 

J4 

J5 

J6 




6510022470 S.CONNECTOR 40FLT-SM1-TB 


W6 7030003860 S.JUMPER ERJ3GE JPW V 

EP1 0910053443 PCB B 5583C 


6 - 5

6-2 MH-127 

[MAIN UNIT] 

REF 

NO. 

ORDER 

NO. 

DESCRIPTION 

IC1 1140009280 S.IC µPD78F9418AGK-9EU (FX-2345D) 

IC2 1110001810 S.IC TA7368F (TP1) 

IC3 1110004490 S.IC M62429FP 700C 

IC4 1120002830 S.IC NJM2125F-TE1 

IC5 1180000420 S.IC TA78L05F (TE12R) 

IC6 1180001250 S.IC TA7808F (TE16L) 

IC7 1110004710 S.IC S-80928ANMP-DDR-T2 

IC8 1130007420 S.IC TC7W14FU (TE12L) 

IC9 1130006220 S.IC TC4W53FU (TE12L) 

Q1 1560000810 S.FET 2SK1069-4-TL 

Q2 1520000460 S.TRANSISTOR 2SB1132 T100 R 


Q4 1590001390 S.FET 2SJ144-Y (TE85R) 


Q6 1590000980 S.TRANSISTOR DTB123EK T147 

Q9 1560000810 S.FET 2SK1069-4-TL 

Q10 1530002060 S.TRANSISTOR 2SC4081 T107 R 

Q11 1510000510 S.TRANSISTOR 2SA1576A T106R 


D1 1750000130 S.DIODE DA204U T107 

D2 1160000060 S.DIODE DAN202U T107 

D3 1750000550 S.DIODE 1SS355 TE-17 

X1 6060000750 S.CERAMIC CSTCC4.91MG 
























R26 7510001150 S.THERMISTOR NTCCM1608 4BH 103KC 


























[MAIN UNIT] 

REF 

NO. 






















C3 4510005430 S.ELECTROLYTIC ECEV0JA220SR 








C12 4030012600 S.CERAMIC C2012 JB 1A 105M-T-A 





































J1 

J2 

ORDER 

NO. 

DESCRIPTION 



DS1 5030001900 LCD A0119 LCD36*28.5 



DS4 5040002310 S.LED SML-311YTT86 




6 - 6

[MAIN UNIT] 

REF 

NO. 

ORDER 

NO. 

DESCRIPTION 

DS7 5040002310 S.LED SML-311YTT86 

DS8 5040002310 S.LED SML-311YTT86 

DS9 5040002310 S.LED SML-311YTT86 

DS10 5040002310 S.LED SML-311YTT86 

6-3 MH-129 

[MAIN UNIT] 

REF 

NO. 

ORDER 

NO. 

DESCRIPTION 

R1 7010006890 RESISTOR R20J 12 K Ω 

R2 7010006880 RESISTOR R20J 6.8K Ω 



MC1 7700002480 MICROPHONE SKB-2746 LPC 

C1 4010008030 CERAMIC DD104 B 471K 50V 

S1 2260002140 S.SWITCH SKQLLC 




EP1 0910053142 PCB B 5526B 

EP2 8930051120 LCD CONTACT SRCN-2320-SP-N-W 

MC1 7700002500 MICROPHONE KUC3523-040245 

S1 2260002330 SWITCH SKHHLP014A 

S2 2260002340 SWITCH SKHHAM024A 



W1 9018490010 WIRE 71/98/010/X98/X98 

W2 9018490010 WIRE 71/98/010/X98/X98 

EP1 0910053701 PCB B-5587A 


6 - 7

SECTION 7 

MECHANICAL PARTS AND DISASSEMBLY 


[CHASSIS PARTS] 

[VR-A BOARD] 

REF. NO. ORDER NO. DESCRIPTION QTY. 

J1 6510004880 Connector MR-DSE-01 1 

W1 8900010470 Cable OPC-1029 (incl. nut, packing) 1 

W2 8900010480 Cable OPC-1040 1 

MP2 8010018470 2438 Chassis 1 

MP3 8930052440 2345 B-IC clip 1 

MP4 8510013700 2438 Case [BLACK] 1 

8510013850 2438 Case (A) [WHITE] 1 

MP5 8930054660 2438 R-PACKING 1 

MP6 8930045280 2040 F-PACKING 1 

MP7 8930034300 1542 ANT SEAL 1 

MP8 8930054620 2438 B-Bush plate 1 

MP9 8830001530 2438 MB nut 2 

MP10 8510011870 2040 MODULE cover 1 

MP11 8930055070 2438 SHEET 1 

MP12 8930053740 O ring 2 

MP13 8930052290 O ring 6 

MP14 8810008680 Screw PH M3x8 NI 4 

MP15 8810008660 Screw PH B0 M3x8 NI-ZU (BT) 6 


MP17 8810002950 Screw BiH M3x6 SUS 2 

MP18 8810006050 Screw E7 6 

MP19 8850000690 Flat washer M3 SUS 6 

MP20 8930055040 2438 cap 1 

MP21 8930049040 Insulating plate 1 

[FRONT UNIT] 


MC1 0800005970 Microphone HM-129B [BLACK] 1 

0800005980 Microphone HM-129W [WHITE] 1 

SP1 2510001110 Speaker 045P1601 1 


R1 7210002350 TP96N97N15F-10KA-1301 (incl. nut) 1 

[VR-B BOARD] 


R1 7210002360 TP96N97N15F-10KB-1301 (incl. nut) 1 

[MAIN UNIT] 


IC3 1150001540 SC-1302 1 

MP1 8510013860 2435 Shield case 1 

MP2 8510013710 2438 Module plate 1 

MP3 8510002280 VCO shield plate (A) 1 

MP4 8930052270 Shield sponge (D) 1 

[ACCESSORIES] 


W1 8900009040 Cable OPC-891 1 

MP1 8950005110 2289 MIC hanger 1 

MP2 8010017250 2040 Mobile bracket [BLACK] 1 

8010017270 2040 Mobile bracket (A) [WHITE] 1 

MP3 8610010560 2040 Knob bolt [BLACK] 2 

8610010590 2040 Knob bolt (A) [WHITE] 2 

MP4 8810004700 Screw PH A0 M3x16 SUS 2 

MP5 8810001490 Screw PH A0 M5x20 SUS 2 

MP6 8850000180 Flat washer M5 SUS 2 

MP7 8850000500 Spring washer M5 SUS 2 

W3 8900010500 Cable OPC-1046 1 

MP1 8210017690 2438 Front panel [BLACK] 1 

8210017770 2438 Front panel (A) [WHITE] 1 

MP2 8930054640 2438 Key board 1 

MP3 8310050810 2438 Window plate 1 

MP4 8610011030 Knob N-286 [BLACK] 2 

8610011040 Knob N-286 (A) [WHITE] 2 

MP5 8930014280 SP net 1 


MP7 8830001350 Sonicrock SL-M3-5.8 4 

MP8 8930052010 2345 Shaft 1 

MP9 8930052030 2345 Spring 1 

MP10 8110007460 2438 D-cover 1 

MP11 8930052020 2345 Shaft angle 1 

MP12 8930052280 O ring (AC) 2 

MP13 8310051220 2438 C-Bush plate 1 

MP14 8610009240 Knob spring 1 



MP2 

W1 

Screw abbreviations 

MP1 

MP3 

A0, B0, BT: Self-tapping 

PH: Pan head 

BiH: Bind head 

NI: Nickel 

SUS: Stainless 

NI-ZU: Nickel-Zinc 

MP4 

MP5 

MP6 

MP7 

DS1 5030001950 LCD TTR5341 1 

EP2 8930054970 LCD contact SRCN-2438-SP-N-W 2 

MP1 8210017700 2438 Reflector 1 

MP2 8930054650 2438 LCD holder 1 

MP3 8930055060 2438 White sheet 1 

7 - 1

MP17 (C) 

MP13 (C) 

MP19 (C) 

MP18 (C) 

MP5 (C) 

MP7 (C) 

J1 (C) 

MP11 (C) 

MP18 (C) 

MP18 (C) 

MP4 (C) 

MP18 (C) 

MP18 (C) 

MP14 (C) 

MP8 (C) 

W2 (C) 

MP19 (C) 

MP13 (C) 

MP18 (C) 

MP6 (F) 

W3 (F) 

MP20 (C) 

W1 (C) 

MP3 (L) 

EP2 (L) 

MP6 (F) 

MP2 (C) 

MP21 (C) 

SP1 (F) 

MP2 (F) 

MP2 (L) 

LOGIC BORAD 

MP14 (C) 

MP14 (C) 

MP3 (C) 

MP6 (C) 

MP5 (F) 

DS1 (L) 

MP1 (L) 

MAIN UNIT 

MP14 (C) 

W1 (C) 

EP2 (L) 

MP3 (F) 

R1 (VB) 

MP11 (F) 

MP8 (F) 

MP12 (F) 

VR-B BOARD 

VR-A BOARD 

MP15 (C) 

MP4 

(M) 

MP3 (M) 

W1 (C) 

MP10 (F) 

MP9 (F) 

R1 (VB) 

MP13 (F) 

R1 (VA) 

MP12 (F) 

MP15 (C) 

IC3 (M) 

MP10 (C) 

MP2 (M) 

MP1 (F) 

R1 (VA) 

MP16 (C) 

MP4 (F) 

MC1 (F) 

UNIT abbreviations 

(C): CHASSIS PARTS, (L): LOGIC BOARD, (M): MAIN UNIT 

(VA): VR-A BOARD, (VB): VR-B BOARD, (F): FRONT UNIT 

7 - 2

7-2 HM-129 


[MAIN UNIT] 



[MAIN UNIT] 

REF. NO. ORDER NO. DESCRIPTION QTY. REF. NO. ORDER NO. DESCRIPTION QTY. 

W1 8900010450 Cable OPC-1034 [BLACK] 1 MC1 7700002500 Microphone KUC3523-040245 1 

8900010460 Cable OPC-1035 [WHITE] 1 

MP1 8210017670 2352 front panel (B)-1 [BLACK] 1 

8210017680 2352 front panel (C)-1 [WHITE] 1 

MP2 8210016850 2352 rear panel [BLACK] 1 

8210017110 2352 rear panel (A) [WHITE] 1 

MP3 8930052160 2352 key 1 

MP4 8930052150 2352 PTT rubber 1 

MP5 8930052140 2352 PTT holder 1 

MP6 8930052690 2352 MIC rubber 1 

MP7 8930052120 2352 rubber 1 

MP8 8930052110 2352 main seal 1 

MP9 8610010870 2352 hanger knob 1 

MP10 8310048760 2352 R-plate 1 

MP11 8310048780 2352 MIC plate 1 

MP12 8820001150 2352 screw 5 

MP13 8850001850 ICOM washer (Y) 5 

MP14 8930052340 O-ring (AE) 5 

MP15 8930052350 O-ring (AF) 1 

MP16 8930053870 2352 sheet (A) 1 

MP17 8930054910 2449 SP Rubber 1 


MP19 8810009260 Screw PH B0 2 × 6 NI 3 

MP21 8810009240 Screw BiH M4 × 10 ZK 1 

MP4 (C) 

MP5 (C) 

MP19 (C) 

Screw and washer abbreviations 

B0: Self-Tapping PH: Pan head 

NI: Nickel 

SUS: Stainless 

ZK: Black 


MP21 (C) 

MP18 (C) 

MP10 (C) 

MP9 (C) 

MP11 (C) 

MP13 (C) 

MP14 (C) 

MP12 (C) 

MP2 (C) 

MP9 (C) 

MP15 (C) 

REF. NO. 

ORDER NO. DESCRIPTION QTY. 

W3 8900010220 Cable OPC-997 [BLACK] 1 

8900010230 Cable OPC-998 [WHITE] 1 

SP1 2510001090 Speaker 036D0801 1 

MP1 8210017261 2417 front panel-1 [BLACK] 1 

8210017291 2417 front panel (A)-1 [WHITE] 1 

MP2 8310049820 2417 Window plate 1 

MP3 8930053510 2417 key board 1 

MP4 8930053540 2417 PTT rubber 1 

MP5 8930053990 2417 PTT sheet 1 

MP6 8930053550 2417 PTT holder 1 

MP7 8930053520 2417 top key 1 

MP8 8930053760 2417 key plate 1 

MP9 8930011900 SP net (A) 1 

MP10 8930039000 1757 sheet 1 

MP11 8810009180 Screw FT B0 M2 × 5 NI-ZU 3 

MP12 8930053750 2417 plate 1 

MP13 8210017250 2417 rear panel [BLACK] 1 

8210017300 2417 rear panel (A) [WHITE] 1 

MP14 8310049970 2417 R-plate 1 

MP15 8610010980 2417 hanger knob 1 

MP16 8930053740 O-ring (AJ) 1 

MP17 8810008450 Screw BiH M4 × 8 ZK 1 


MP19 8930053530 2417 rubber 1 

MP20 8820001180 2417 screw 2.6 × 16 6 

MP21 8930053730 O-ring (AI) 6 

[ACCESSORIES] 

REF. NO. 


W1 8900010280 Cable OPC-1000 1 

MP1 8950005110 2289 mic hanger 1 

MP2 8810004700 Screw PH M3 × 16 SUS 2 

MP3 8310050320 2417 C-plate 1 

MP4 8810004700 Screw PH M3 × 16 SUS 3 

MP8 (C) 

MP2 (M) 

EP2 (M) 

MAIN UNIT 

MP3 (M) 

REF. NO. 


DS1 5030001900 LCD A0119 (LCD 36 × 28.5) 1 

EP2 8930051120 LCD contact SRCN-2320-SP-N-W 2 

MC1 7700002480 Microphone SKB-2746 LPC 1 

MP1 8930053780 2417 LCD holder 1 

MP2 8210017240 2417 reflector 1 

MP3 8310050200 2417 H-plate 1 

MP4 8930039610 Thermally sheet (C) 1 

MP5 8930054890 Insulate sheet (GM) 2 

Screw and washer abbreviations 

PH: Pan head FT: Flat head 

B0: Self-tapping NI-ZU: Nickel-zinc 

SUS: Stainless ZK: Black 


MP11 (C) 

MP4 

(M) 

MP19 (C) 

MP14 (C) 

MP18 

(C) 

MP17 

(C) 

MP21 (C) 

MP16 (C) 

MP13 (C) 

MP20 (C) 

MP15 (C) 

MP17 (C) 

MP1 (C) 

MP8 (C) 

MP16 (C) 

MAIN UNIT 

MC1 (M) 

MP3 (C) 

HM-129 

UNIT abbreviations 

MP7 (C) 

W1 (C) 

(C): CHASSIS PARTS, (M): MAIN UNIT 

MP4 (C) 

MP7 (C) 

MP5 (M) 

DS1 (M) 

MP1 (M) 

MC1 (M) 

MP3 (C) 

MP6 (C) 

MP5 (C) 

MP10 (C) 

MP1 (C) 

SP1 (C) 

W3 (C) 

MP12 (C) 

HM-127 UNIT abbreviations 

(C): CHASSIS PARTS 

(M): MAIN UNIT 

W1 

MP3 MP1 

MP2, MP4 

HM-127 ACCESSORIES 

7 - 3

SECTION 8 

SEMI-CONDUCTOR INFORMATION 

• TRANSISTOR AND FET’S 

• DIODES 

2SA1576 R 

(Symbol: FR) 

2SA1588 

(Symbol: ZG) 

2SB1132 R 

(Symbol: BAR) 

2SB1143 S 

(Symbol: B1143) 

E 

2SC2714 Y 

(Symbol: QY) 

1SS355 

(Symbol: A) 

1SS375 

(Symbol: FH) 

DA204 U 

(Symbol: K) 

DAN202 U 

(Symbol: N) 

HSM88ASR 

(Symbol: C3) 

B 

E 

C 

B 

E 

C 

B 

C 

B 

E 

C 

A 

C 

B 

C 

E 

2SC3268 

(Symbol: ME) 

2SC3775 3 

(Symbol: OY3) 

2SC4081 R 

(Symbol: BR) 

2SC4116 BL 

(Symbol: LL) 

2SC4215 O 

(Symbol: QO) 

HVU350 

(Symbol: 4) 

MA77 

(Symbol: 4B) 

MA728 

(Symbol: 2A) 

XB15A308 

(Symbol: T8) 

B 

E 

C 

B 

E 

C 

A 

K 

A 

C 

2SC4226 R25 

(Symbol: R25) 

2SD1664 Q 

(Symbol: DAQ) 

2SJ144 Y 

(Symbol: VY) 

2SK1069 

(Symbol: FJ) 

3SK272 

(Symbol: DU) 

B 

E 

C 

B 

C 

E 

C 

S 

D 

G 

S 

D 

G 

G1 

G2 

S 

D 

DTA114 EUA 

(Symbol: 14) 

DTA144 EU 

(Symbol: 16) 

DTB123 EK 

(Symbol: F12) 

DTC114 EU 

(Symbol: 24) 

DTC144 EU 

(Symbol: 26) 

B 

B 

B 

B 

B 

C 

C 

C 

C 

C 

E 

E 

E 

E 

E 

FMW1 

(Symbol: W1) 

8 - 1

S3 

SECTION 9 

BOARD LAYOUTS 

9-1 VR-A BOARD 

to Main unit J5 

W1 

HV 

GND 

VOL2 

VOL1 

HVS 

9-3 HM-129 

• TOP VIEW 

1 

5 

1 

W1 

R1 

R1 

B-5585B 

S2 

R2 

R3 

C1 

R4 

MC1 

S4 

9-2 VR-B BOARD 

to Main unit J5 

W1 

GND 

SQLV 

5V 


1 

3 

1 

W1 

R1 

S1 

B-5586B 

9 - 1

9-4 LOGIC BOARD 

• TOP VIEW 

C32 

Q11 

C22 

C28 

R87 


R86 

R26 

R46 

R47 


R17 

R20 

Q8 

Q4 


R82 

R7 C24 

X1 

C14 

R78 

R1 

R2 

R79 

R39 


Q9 

R76 

D2 

C7 

Q6 Q10 

R42 

Q5 

R41 R6 R34 

C9 

D1 

C4 

R5 

R4 

J4 

J1 

J2 

C3 C6 C5 

9 - 2 

R71 

R8 

R77 

Q7 

R9 

Q1 

C25 

R43 

R26 

R36 

R3 


C11 


C27 

C13 

R81 

R80 

R84 

R75 

R44 

R45 

C21 

R11 

R83 

R10 

R74 C20 

C31 

R69 

R68 

R67 

R66 

R65 

R64 

R63 

R62 

R72 

R53 

R54 

R52 

R35 C2 

R70 

R73 

R61 

R60 

R59 

R58 

R57 

R56 

R55 

R51 

R50 

R85 C8 

C18 C30 

C10 R12 

R22 R18 

R19 

R13 

R16 

R14 

R21 

R15 

R12 

Q2 

Q3 

B5584B 

ICOM 

C1 

J3 

SP— 

to Front unit SP1 

to Front unit SP1 

SP+ 


1 

1 

1 

J3 J4 

J1 J2 

J3 

J4 

40 2 

SP+ 

SP 

BEEPM 

— 

HVS 

5V 

RCV 

SEND 

GND 

GND 

DSENC 

DSDEC 

WXDEC 

PTTS 

PTTM 

RMUTM 

MMUTE 

GND 

PDATA 

PCK 

GND 

KEYM 

SP+ 

— 

SP 

BPLVL 

HVS 

— 

5V 

GND 

GND 

TMUT 

TXDET 

HI/LO 

SQLV 

PTT 

BPFV 

RMUTS 

SMUTE 

SQL 

UNLK 

PSTB 

GND 

ICF3 

CLDA 

LCDA 

2 1 

From Smart Mic HM-129 

39 

From/to Main unit J6 

1 

J1 

NMEA 

NMEA+ 

4 1 

From/to Remoto Mic HM-127 

J2 

2 1 

From External GPS 

C23 

BE


DS1 

DS4 

DS8 

DS3 

DS7 

DS6 

DS5 

9 - 3

9 - 4 

9-5 MAIN UNIT 

• TOP VIEW 

C259 

C109 

C111 L14 

C107 

D10 

C106 

C197 C198 

C102 

C108 

L13 

C105 

L11 

L15 

D15 

MP1 

L12 

R71 

[TX-PWR] 

FI1 

FI2 

CP2 

[SQL] 

R16 

[REF] 

C36 

CP1 

[MOD] 

R138 

T5 

R5 

FI3 

C80 

C83 

EXT-MIC 

D11 

VR-A/B 

C185 

C186 


Q12 

CP3 

B-5583C 

L19 

C207 

C202 

D21 

C211 

C212 

C253 

R157 

C214 

C226 

C213 

C215 

C208 

L20 

D19 

C209 

R187 

C252 

C227 

C228 

R155 

R190 

R158 

L26 

Q27 

C210 

R185 

R186 

C251 

C206 

C204 

C203 

C225 

C256 

L1 

W6 

C67 

R51 

R49 

R50 

C64 

L8 

C65 

C54 

C56 

C63 

Q8 

Q9 

R45 

R44 

R48 

R41 

C59 

L5 

C53 

C52 

D3 

D4 

C55 

C58 

C57 C62 

C66 

C43 

R43 

R25 

C37 


R26 

C35 

X2 

R28 

Q24 

R147 

C179 

C180 

R148 

C246 

R138 

C178 

C177 

C146 

C145 

C40 

J4 

C112 

C113 

C191 

C114 

C193 

C192 

C194 

J2 

R57 

R60 

R192 

R139 

R76 

C98 

C92 

C91 

Q15 

R75 

R71 

Q14 

C75 

R61 

C79 

C78 

C76 

C196 

C195 

C190 

R63 

L9 

C173 

C172 

C127 

C126 

C123 

C122 

C125 

C124 

C175 

C174 


R144 

J5 

J6 

R112 

R111 

R110 

C152 

R109 

C151 

R93 

R95 

R166 

R167 

R94 

R98 

R96 

C137 

R99 

C138 

R97 

C139 

R100 

R101 

C140 

C231 

R161 

R106 

C143 

C245 

R160 

R107 

R108 

C146 

R159 

C230 

R162 

C229 

R104 

C142 

C147 

C145 

C144 

R105 


C168 

R169 

R140 

R142 

R143 

R141 

C156 

C148 

C136 

C150 

C170 

C141 

R103 

R102 

Q21 

Q28 C149 

C181 C84 

C182 

R151 

R152 

C183 

C184 

C176 

C171 

C270 

C74 

Q11 

L30 L31 

R62 

D7 

L10 

Q10 

C77 

R64 

C189 

C128 R170 R82 

R90 

R91 



Q20 

C133 

C135 

R92 

C134 

R89 

Q19 

C131 

R85 

R86 

R83 

R87 

R81 

R84 

R88 

Q18 

D12 

C132 

C130 

C129 

Q23 

C34 

C39 

R165 

C227 

R80 

C120 

C121 

Q25 

Q22 

C33 C38 

C36 

R136 

R137 

R135 

R39 

C45 

R37 

R38 

C47 

R27 

C32 

C260 

R22 

R14 

C29 

C30 


X1 

Q6 

R46 

C60 

Q5 

Q7 

L6 

R52 

R33 

C258 

C61 

R42 

C21 

C20 

C19 

R47 

L7 

L4 

C50 

C51 

Q3 

L28 

C22 

R16 

R67 

R68 

R69 

R74 

R66 

C90 

C95 

C94 

R70 

Q17 

C99 

C100 

C101 

R77 

R56 

C268 

L29 

C267 

R58 

C73 

R54 

C70 

C72 

R59 

C68 

C71 

C11 

C10 

C9 

L16 

L17 

C5 

R6 

R5 

L27 

C4 

C3 

C6 

R7 

C254 

R188 

C224 

C223 

L2 L3 

R163 

R3 

Q1 

ICOM 

PTT 

MICG 

MIC 

GND 

1 

J4 

4 

from Smart Mic HM-129 

VCC 

AF/MIC 


PTTC 

1 

J2 

4 

from/to Optional unit 

HM-127 

SP+ 

— 

SP 

BPLVL 

HVS 

— 

5V 

GND 

GND 

TMUT 

TXDET 

HI/LO 

SQLV 

PTT 

BPFV 

RMUTS 

SMUTE 

SQL 

UNLK 

PSTB 

SP+ 

SP 

BEEPM 

— 

HVS 

5V 

RCV 

SEND 

GND 

GND 

DSENC 

DSDEC 

WXDEC 

PTTS 

PTTM 

RMUTM 

MMUTE 

GND 

PDATA 

PCK 

1 39 

2 

J6 

40 

to Logic unit J4 

HVS 

VOL1 

VOL2 

GND 

HV 

5V 

SQLV 

GND 

8 

J5 

1 

from/to VR-A, 

VR-B boards

9 - 5 

SP+ 

SP- 

R65 

R154 

C187 

C118 

C188 

GND 

to LOGIC board J2 

C115 

C116 

C271 

C81 

HV 

C85 

C86 

C87 

C161 

R126 

C166 

R133 

R127 

R128 

C164 

C165 

R125 

R129 

R131 

R132 

C274 

C273 

R124 

R130 

R183 

C162 

R199 

C160 

R123 

R198 

C276 

R121 

C159 

R201 

R113 

R122 

C155 


R150 

R149 

Q26 

D14 

R134 

C255 

C262 

C261 

MP3 

R168 

R195 

R196 

R194 

R193 

C265 

C264 

R169 

R32 

R29 

R30 

R31 

C41 

C42 

C28 

C27 

C23 

C257 

C18 

C25 

Q2 

R13 R12 

R19 

R17 R18 

C275 

R10 

C272 

R36 

R34 R35 

R20 

C31 

C24 

R15 

C26 

R21 

C16 

C17 

R11 

Q4 

C46 

C44 

C14 

C266 

R9 

C7 

L25 

L24 

L21 

C217 

C222 

C218 

C220 

D20 

C221 

L22 

C216 

C12 

R8 

R53 

C249 

C200 

C199 

C201 

R191 

D16 

D5 

D6 C49 

C48 

R40 

D2 

D1 

D9 

R79 

C104 

C93 

D8 

C103 

R78 

R73 

C88 

C82 

C89 

C97 

C96 

Q16 

• BOTTOM VIEW


• TOP VIEW 

9 - 6


21 

20 

40 

41 

1 

80 

4 

1 

5 8 

60 61 

8 5 

8 5 

1 

4 

1 

4 

J1 

PWRC 8 

RRXDA 

RTXDA 

PTTC 

GND 



VCC 1 

to IC-M402 

MAIN unit J2 and 

LOGIC board J1 

5 1 

6 

10 

9 - 7

SECTION 10 

BLOCK DIAGRAM 

FRONT UNIT 

MAIN UNIT 

FI3: ALFY450E 

OPTION 

EXTERNAL SPEAKER 

EXT.SP 

WXDEC 

Q28: 

2SC4116 BL 

LPF 

IC1: 

TA31136FN 

FM 

DET 

2nd IF 

AMP 

CERAMIC 

BPF 

2nd 

MIX 

Q2: 

2SC2714 Y 

IF 

AMP 

FI1,2: FL310 

XTAL 

BPF 

Q1: 

3SK272 

BPFV 

BPF 

Q27: 2SC4226 R25 

RF 

AMP 

BPF 

LPF 

Q17: 2SD1664 Q 

D10: XB15A308 

D15: XB15A308 

HVS 

ANT 

SW T5 

ANT 

HM-129 

SMART MIC 



PTT 

DSDEC 


NJM2211M 

DSC 

DECODER 

NOISE 

AMP 

NOISE 

DET 

2nd Lo 

BUFF 

TX/RX 

SW 

Q10: 

2SC3775 3 

PRE 

DRIVE 

Q11: 

2SC3268 

YGR 

AMP 


SC-1302 

PWR 

AMP 

RF OUT 

DET 

D8, D9: HSM88ASR 

TXDET 

D5: MA77 

D6: MA77 

HV 

Q12: 2SB1143 S 

Q15: FMW1 

INTERNAL 

SPEAKER 

SP 

SQL 

X2: CR659 

APC 

CTRL 

HVS 

T5 

VR-B BOARD 

5V 

KEY 

BOARD 

SQLV 

X1: CR-691 

9.8304MHz 


BU4094BCFV 

DECODER 

&MULTI 


S-80942A NMP-DD6 

RESET 

LOGIC BOARD 

RCV 

SEND 

SMUTE 

MMUTE 

PTTS 

PTTM 

RMUTS 

BEEPM 

BPLVLM 


LA4425A 

HVS 

PWR 

AMP 

Q26: DTC144EU 

D14: DA204U 

LEVEL 

CONV 

VR-A BOARD 

(FRONT UNIT) 


PD3140GS 

VCO 

D1, D2: MA77 

D3, D4: HVD350 

Q4: DTC144EU 

Q5, Q6: 2SC4226 R25 

LOOP 

FIL 

PLL 

IC 

Q3: 

2SC4116 BL 

RIPPLE 

FIL 

VCO 

Q8: 

2SC4215 O 

5V 

BUFF 

Q7: 

2SC4215 O 

BUFF 

Q9: 

2SC4215 O 

BUFF 

SEND 

T5 

TX 

MUTE 

CTRL 

Q24: 2SA1588 GR 

Q25: DTC144EU 

T5 

CTRL 

TMUT 

Q14: DTC144EU 

IC8: TA7805F 

+5 

REG 

PWR 

CTRL 

Q16: DTC144EU 

HI/LO 

VR-A BOARD 

(FRONT UNIT) 

DS1: 

TTR5341 

LCD 

MPU 

IC1: HD6473847RH 


HN58X2432TI 

EEPROM 

RMUTM 

IC7D: 

NJM2902M 

LPF 

R5 

IC7C: 

NJM2902M 

IDC 

RCV 

R5 

Q22: 2SA1588 GR 

Q23: DTC144EU 

RS 

CTRL 

HVS 

PTT 

Q2: 2SC4116 BL 

Q3: 2SB1132 R 

Q4: 2SC4116 BL 

DIM 

CTRL 

LCD 

CONT 

Q11: 

2SK1069 4 

D/A 

Q8: 2SK1069 4 

DSENC 

BUFF 

Q21: 2SC4116 BL 

HPF 

IC7B: 

NJM2902M 


AMP 

DSENC 

5V 

HV 

D11: DSA3A1 

REVERSE 

CONECT 

PROTECT 

13.8V 

EXTERNAL 

GPS 

NMEA+ 

NMEA 


PC357N6T 

PHOTO 

COUPLE 

IC4F: 

TC47HC14AF 

BUFF 

GATE 

CTRL 


TC47HC02AF 

TMUT 

HI/LO 

RMUTM 

AF 

MUTE 

AF 

MUTE 

MMUTE 

AF 

MUTE 

IC4A: 

BU4066BCFV 

IC4D: 

BU4066BCFV 

AF 

MUTE 

Q6: DTC114EU 

Q9: DTC114EU 

D2: 1SS355 

IC4B: TC74HC14AF 

CI-V 

I/F 

BUFF 

IC4A, IC4C: 

TC74HC14AF 

Q5: 2SC4081 R 

Q7: 2SA1576 R 

Q10: 2SK1069 4 

TXDET 

WXDEC 

DSDEC 

SQL 

BPFV 

BEEPM 

BPLVL 

IC5A: BU4066BCFV 

IC5B: BU4066BCFV 

RMUTS 

AF 

MUTE 

IC5D: BU4066BCFV 

IC5C: BU4066BCFV 

AF 

MUTE 

SMUTE 

Q20: 2SK1069 4 

BUFF 

PTTM 

IC4B: 

BU4066BCFV 

AF 

MUTE 

PTTS 

Q18: DTC144EU 

D12: 1SS355 

GATE 

CTRL 

/PTTC 

IC4C: 

BU4066BCFV 

AF 

MUTE 

PTTC 

Q19: DTA144EU 

GATE 

CTRL 

COMMON LINE 

RX LINE 

TX LINE 

LINE 

OPTION 

REMOTE MIC 

HM-127 


VCC (HVS) 


PTTC 

PTT 

DATA BUS LINE 

10 - 1

SECTION 11 

VOLTAGE DIAGRAM 

11-1 LOGIC BOARD 

J2 

from 

external 

GPS 

J1 

from/to 

Remoto MIC 

(HM-127) 

DS1 

TTR5341 

S27 1 

S28 2 

S13 3 

S14 4 

S15 5 

S16 6 

S17 7 

S18 8 

S19 9 

S20 10 

S21 11 

S22 12 

S23 13 

S24 14 

S25 15 

S26 16 

C0 17 

C1 18 

C2 19 

C3 20 

S1 21 

S2 22 

S3 23 

S4 24 

S5 25 

S6 26 

S7 27 

S10 28 

S11 29 

S8 30 

S9 31 

S12 32 

3 

1 

2 

4 

5 

1 

2 

3 

4 

6 

SEG26 

SEG27 

SEG12 

SEG13 

SEG14 

SEG15 

SEG16 

SEG17 

SEG18 

SEG19 

SEG20 

SEG21 

SEG22 

SEG23 

SEG24 

SEG25 

COM0 

COM1 

COM2 

COM3 

SEG0 

SEG1 

SEG2 

SEG3 

SEG4 

SEG5 

SEG6 

SEG9 

SEG10 

SEG7 

SEG8 

SEG11 

NMEA+ 

NMEA 

C26 

0.01 

LCDA 

CLDA 

ICF3 

GND 

R77 

47 

R41 

1 k 

R42 

47 k 

R34 

470 

D1 

ISS355 

EXSTB 

PDATA 

PCK 

RMUTM 

RMUTS 

PTTM 

PTTS 

C9 

0.0047 

Q5 

2SC4081 R 

R36 

4.7 k 

Q7 

2SA1576 R 

Q10 

2SK1069 4 

R43 

1 k 


5V 

BU4094BCFV 

1 

STRB VDD 

2 

16 DATA OENA 

3 

15 

CLK Q5 

4 

Q1 Q6 

5 

Q2 Q7 

6 

Q3 Q8 

7 

Q4 Q’S 

8 

VSS QS 9 

10 

11 

12 

13 

14 

C14 

0.01 


PC357N6T 

R35 

6.8 k 

D2 

ISS355 

C13 

0.01 

C27 

0.01 

Q9 

DTA114EU 

Q6 

DTC114EU 

5V 

14 

13 

12 

11 

10 

9 


TC74HC14AF 

1 

2 

3 

4 

5 

6 

R39 

47 k 

NMEAI 

7 8 

ICF3_ON 0 V 

HM-127_ON 4.98 V 

C25 

0.01 

EXOE 

RCV 

SEND 

SMUTE 

MMUTE 

PTTS 

PTTM 

RMUTS 

RMUTM 


S-80942 ANMP-DD6 

5 

CD OUT 1 

4 VDD 2 

NC VSS 3 

C10 

0.027 

9.83 MHz 

3.8 Vp-p 


TC74HC02AF 

1 

14 

2 

13 

3 

12 

4 

11 

5 

10 

6 

9 

7 8 

DS7 

FY1101 F-TR 

DS8 

FY1101 F-TR 

R26 

330 

R84 

100 k 


HN58X2432TI 

1 

A0 VCC 

2 

A1 WP 

3 

A2 SCL 

4 

VSS SDA 5 

6 

7 

8 

NMEAI 

5V 

HVS 

R44 

39 k 

C12 

0.01 

C11 

0.01 

DIM3 

R45 

39 k 


DIM3 

DIM3 

DIM2 

DIM1 

RRXD 

RTXD 

NMEAI 

CONT1 

CONT2 

R20 18 k 

R46 

8.2 k 

R47 

10 k 

R21 

18 k 

C24 

27 P 

R22 

18 k 

DSDEC 

BEEPM 

X1 

CR-691 

R17 

10 k 

R18 

10 k 

R19 

18 k 

R78 

100 k 

CONT1 

CONT2 

BEEPM 

EXOE 

CH16 

CHWX 

H/L 

DSDEC 

R15 

39 k Q2 

2SC4116 BL 

R16 

47 k 

R7 

1 M 

C28 24 P RES 

PCK 

PSTB 

PDATA 

EXSTB 


BPLVL 

ECK 

EDA 

DIM1 

DIM2 


R80 10 k 

R81 10 k 

R82 100 k 

Q11 

2SK1069 4 

R85 

3.3 k C30 

0.01 

R50 

15 k 

5V 

Q3 

2SB1132 R 

R51 

1.5 k 

R12 

12 k 

Q4 

2SC4116 BL 

R14 

1 k 

R75 

150 k 

R74 

47 k 

R79 

100 k 

R76 

100 k 

R13 

3.3 k 

1 

P10/TMOW 

2 

P11/TMOFL 

3 

P12/TMOFH 

4 

P13/TMIG 

5 

P14/IRQ4/ADTRG 

6 

P15/IRQ1/TMIC 

7 

P16/IRQ2 

8 

P17/IRQ3/TMIF 

9 

X1 

10 

X2 

11 

VSS 

12 

OSC2 

13 

OSC1 

14 

TEST 

15 

RES 

16 

P20/SCK1 

17 

P21/SI1 

18 

P22/SO1 

19 

P23 

20 

P24 

21 

P25 

22 

P26 

23 

P27 

24 

P30/PWM 

25 

P31/UD 

R52 

10 k 

HVS 

R54 

10 k 

R10 

27 

R11 

27 

R83 

27 

C20 

0.01 

UNLK 

DN 

UP 

DSC 

DTRS 

PTT 

KEYM 

TXDET 

LBAT 

SQL 

SQLV 

WXDEC 

100 

99 

P32/RESO 

P33/SCK31 

98 

97 

96 

95 

94 

AVSS 

PC3/AN11 

PC2/AN10 

26 

27 

28 

29 

30 

31 

32 

DIM3 

HI/LO 

RRXD 

RTXD 

PC1/AN9 

PC0/AN8 

PB7/AN7 

PB6/AN6 

P34/RXD31 

P35/TXD31 

P36/AEVH 

P37/AEVL 

BPFV 

R53 

10 k 

C21 

0.001 

R72 

20 k 

BAND EXTENTION 

C32 

0.001 


HD6473847 RH 

CSEG3 

CSEG2 

CSEG1 

BE 

DSENC 

NMEAI 

/TMUT 

HVS 

SEG27 

SEG26 

SEG25 

93 

92 

91 

90 

89 

88 

87 

86 

85 

84 

83 

82 

81 

80 

79 

78 

77 

76 

PB5/AN5 

PB4/AN4 

PB3/AN3 

PB2/AN2 

PB1/AN1 

PB0/AN0 

AVCC 

P43/IRQ0 

P42/TXD32 

P41/RXD32 

P40/SCK32 

P97/SEG40/CL1 

P96/SEG39/CL2 

P95/SEG38/DO 

P94/SEG37/M 

P93/SEG36 

P92/SEG35 

P91/SEG34 

33 

34 

35 

36 

37 

38 

39 

40 

41 

42 

43 PA0/COM1 

PA1/COM2 

PA2/COM3 

PA3/COM4 

VCC 

V0 

V1 

V2 

V3 

VSS 

CVCC 

44 

45 

46 P52/WKP2/SEG3 

P51/WKP1/SEG2 

P50/WKP0/SEG1 

47 

48 

49 

50 

P57/WKP7/SEG8 

P56/WKP6/SEG7 

P55/WKP5/SEG6 

P54/WKP4/SEG5 

P53/WKP3/SEG4 

COM3 

COM2 

COM1 

COM0 

DSENC0 

DSENC1 

DSENC2 

DSENC3 

DSENC4 

DSENC5 

DSENC6 

DSENC7 

DSENC1 

R62 

20 k 

R55 

10 k 

R86 

100 k 

R63 

20 k 

R56 

10 k 

PTT 

R87 100 k 

R9 

33 k 

C22 

10 

DSENC2 

R64 

20 k 

R57 

10 k 

DTRS 

DS3 

SML-311 YT 

P90/SEG33 75 

P87/SEG32 

P86/SEG31 

P85/SEG30 

P84/SEG29 

P83/SEG28 

P82/SEG27 

P81/SEG26 

P80/SEG25 

P79/SEG24 

P76/SEG23 

P75/SEG22 

P74/SEG21 

P73/SEG20 

P72/SEG19 

P71/SEG18 

P70/SEG17 

P67/SEG16 

P66/SEG15 

P65/SEG14 

P64/SEG13 

P63/SEG12 

P62/SEG11 

P61/SEG10 52 

53 

54 

55 

56 

57 

58 

59 

60 

61 

62 

63 

64 

65 

66 

67 

68 

69 

70 

71 

72 

73 

74 

P60/SEG9 

51 

DSENC3 

C23 

0.01 

DTRS 

S1 

TMUT 

Q1 

DAT144EU 

5V 5V 

R65 

20 k 

R58 

10 k 

R1 

100 k 

S2 

R2 

100 k 

R3 

100 k 

S3 

5V 

DSC UP DN 

DS4 

SML-311 YT 

C18 

0.01 

C8 

10 

SEG24 

SEG23 

SEG22 

SEG21 

SEG20 

SEG19 

SEG18 

SEG17 

SEG16 

SEG15 

SEG14 

SEG13 

SEG12 

SEG11 

SEG8 

SEG7 

SEG10 

SEG9 

SEG6 

SEG5 

SEG4 

SEG3 

SEG2 

SEG1 

SEG0 

5V 

DSENC4 

R66 

20 k 

R59 

10 k 

DSC 

DSENC5 

KEYM 

KEYM 

DSENC6 

R67 

20 k 

R60 

10 k 

UP 

R6 

820 

HVS 

DSENC7 

R68 

20 k 

R61 

10 k 

5V 

DN 

DSENC 

R69 

20 k 

S4 

R73 

220 k 

R4 

100 k 

16CH 

DS5 

SML-311 YT 

C2 

0.001 

BEEPM 

BPLVL 

RCV 

SEND 

5V 

CH16 

HVS 

TMUT 

TXDET 

DSENC 

HI/LO 

DSDEC 

SQLV 

WXDEC 

PTT 

PTTS 

BPFV 

PTTM 

RMUTS 

RMUTM 

SMUTE 

MMUTE 

SQL 

UNLK 

PDATA 

PSTB 

PCK 

4.98 

Q8 

2SK1069 4 

S5 S6 S7 

13.81 V 

5V 

CHWX 

DS6 

SML-311 YT 

KEYM 

DSENC 

R70 

820 k 

R71 

2.7 k 

CHWX 

C1 

0.001 

C5 

0.001 

C6 

470 P 

R8 

10 k 

C4 

470 P 

C31 

0.01 

H/L 

R5 

820 

C3 

0.001 

C7 

0.01 

DTRS 

DSC 

UP 

DN 

CH16 

CHWX 

H/L 

SP+ 

SP+ 

SP 

SP 

BEEPM 

BPLVL 

HVS 

HVS 

5V 

5V 

RCV 

SEND 

TMUT 

TXDET 

DSENC 

HI/LO 

DSDEC 

SQLV 

WXDEC 

PTT 

PTTS 

BPFV 

PTTM 

RMUTS 

RMUTM 

SMUTE 

MMUTE 

SQL 

UNLK 

PDATA 

PSTB 

PCK 

J4 

39 

37 

35 

33 

31 32 

29 

27 28 

25 26 

23 24 

21 22 

19 20 

17 18 

15 

13 

9 

7 

5 

3 

1 

3 

1 

2 

4 

40 

38 

36 

34 

30 

16 

14 

11 12 

10 

8 

6 

4 

2 

SP 

to Internal Speaker 

SP+ 

from/to main unit J6 

J3 

from Smart Microphone 

(HM-129) 

11 - 1

11-2 MAIN UNIT 

J6 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

17 

from/to 

18 

LOGIC BOARD 19 

J4 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

31 

32 

33 

34 

35 

36 

37 

38 

39 

40 

SP+ 

SP+ 

SP 

SP 

BEEPM 

BPLVL 

HVS 

HVS 

5V 

5V 

RCV 

SEND 

TMUT 

TXDET 

DSENC 

HI/LO 

DSDEC 

SQLV 

WXDEC 

PTT 

PTTS 

BPFV 

PTTM 

RMUTS 

RMUTM 

SMUTE 

MMUTE 

SQL 

UNLK 

PDATA 

PSTB 

PCK 

C195 

0.001 

C189 

0.001 

C196 

0.01 

C192 C193 

22 P 0.01 

C255 

0.001 

C190 

0.001 

SP+ 

SP 

BEEPM 

BPLVL 

TXDET 

DSENC 

HI/LO 

DSDEC 

SQLV 

WXDEC 

PTT 

PTTS 

BPFV 

PTTM 

RMUTS 

RMUTM 

SMUTE 

MMUTE 

SQL 

R194 1 k R196 1 k 

C261 

0.001 

C265 

47 P 

C264 

47 P 

R193 

1 k 

C191 

22 P 

RCV 

SEND 

TMUT 

R195 

1 k 

1.79V 

C262 

47 P C194 

0.01 

R165 

100 k 

PSTB 

PCK 

PDATA 

UNLK 

DET 

5V 

R5 

HVS 

HV 

T5 

5V 

R5 

HVS 

HV 

T5 

5V 

R5 

HVS 

HV 

T5 

4.98V 

DET 

5V 

C39 

0.001 

R28 330 

R29 

1 k 

C40 

0.01 

C41 

0.047 

IC2 UPD3140GS 

1 

VCC1 GND1 

2 

IN1 IN2 19 

20 

3 

ENB VCC2 

4 

CLK XB 

5 

DATA XI 

16 

17 

18 

6 

T1 

XO 

7 

LOK GND2 14 

15 

8 

CP1 CP2 13 

9 

FI1 FI2 

10 

FO1 FO2 11 

12 

R30 

10 

R31 

2.2 k 

C42 

2.2 

Q3 

2SC4116 BL 

R33 

1 k 

C257 

0.01 

R36 

100 

Q4 

DTC144EU 

R37 33 k 

R38 

100 k 

5V 

DET 

C143 

0.1 

R106 

33 k 

R143 

6.8 k 

C43 

10 

C47 

0.1 

R142 

6.8 k 

R139 

8.2 k 

R39 C45 

22 k 0.01 

R141 

8.2 k 

HV 

HVS 

T5 

R5 

5V 

R32 

10 k 

R5 

HVS 

HV 

CP1 

T5 

5V 

VCO5 

R34 

1 k 

R35 

47 k 

C44 

0.001 

R104 

18 k 

R160 

10 k 

C231 

0.0068 

C170 

10 

R138 

RV-110 

DSENC 

C171 

100 

5V 

C169 

0.1 

R137 

15 k 

C172 

0.01 

R41 

560 

C50 

0.1 

R40 1.8 k 

C46 C272 

470 P 10 

R161 

10 k 

0.5Vp-p 

at 1kHz 3kHz DEV 

L28 82 nH 

R25 100 

C258 

9 P 

C34 C33 

C259 

0.01 0.1 

9 P 

C260 

0.001 

C38 

0.001 

R26 

330 

X2 CR-659 

C37 C36 

12 P 10 P 

L4 

2.7 H 

C51 

0.001 

D1 D2 

MA77 MA77 

C142 

0.01 

Q28 

2SC4116 BL 

R140 

10 

C173 

0.1 

R162 

10 k 

C230 

0.022 

C229 

0.0022 

4.95V 

R136 

18 k 

C246 

0.0022 

C168 

0.001 

O 

C48 C49 

0.001 470 P 

R159 

1 k 

5V 

VBIAS 

AF5 

C273 

0.1 

R134 

33 k 

R135 

103 

C274 

0.018 

C145 

0.01 

R105 

10 k 

IC8 TA7805 

G 

I 

C144 

0.0068 

R199 

68 k 

L5 

80 nH 

C52 

47 P 

C53 

39 P 

C35 

18 P 

R27 

1.5 k 

D3 

HVU350 D4 

HVU350 

WXDEC 

5V 

DET 

R107 

47 k 

C174 C175 

0.1 0.01 

R108 

470 k 

C146 

0.22 

13 

14 

12 

IC7D 

NJM2902M 

DSENC 

DSDEC 

C166 

56 P 

R144 

33 

C176 

10 

5V 

2ndLO 

R5 R5 

2.35V 

DET 

C54 

1.5 P 

R43 

8.2 k 

DET 

SQL 

C26 

0.001 

R16 

RV-152 

C266 

0.001 

R44 

100 

R45 

390 

R42 

8.2 k 

C56 

0.001 

R46 

180 

C55 

1.5 P 

C245 0.1 

C147 

0.1 

C23 C22 C21 

0.22 10 0.01 

C25 

0.001 

R15 

470 

R18 

33 k 

R17 

333 

R47 

680 

IC6 NJM2211M 

1 

V+ CAP 14 

2 

IN CAP 

3 

LOCK R 12 

13 

4 

GND LOOP 11 

5 

Q REF 10 

6 

Q NC 

7 

DATA FSK 8 

9 

CP3 

C177 

0.1 

R133 

82 k 

RCV 

3.55V 

R14 1.2 k 

X1 

CDBCA450CX24 

C24 C29 

R21 

0.001 0.001 

390 

C27 220 P 

C59 

470 P 

C60 

C57 

0.5 P 

470 P 

Q5 

2SC4226 

C58 

470 P 

C28 

220 P 

R19 R20 

820 330 k 

Q6 

2SC4226 R25 

R103 47 

C148 

10 

C149 

0.033 

R48 

68 k 

L6 

0.1 H 

Q7 

2SC4215 0 

R110 

39 k 

R109 

100 k 

C150 C151 

0.0022 0.1 

C165 

0.0047 R131 

82 k 

R132 

82 k 

C164 

820 P 

DSENC 

HV 

HVS 

T5 

R5 

5V 

C141 

10 

R111 15 k 

R112 

2.2 k 

C152 

0.01 

C30 

0.1 

C20 

100 P 

9 

10 

11 

12 

13 

14 

15 

16 

C31 

0.1 

5V 

R5 

HVS 

HV 

2ndLO 

T5 

5V 

R49 

470 

C61 

470 P 

C62 

5 P 

R50 

68 k 

Q8 

2SC4215 0 

W6 

4.72V R102 1 k 4.28V 

R183 

100 k 

Q22 2SA1588 GR 

R145 

10 k 

0.89V 

R130 

18 k 

Q23 

DTC144EU 

R129 

27 k 

R128 

4.7 k 

C162 

0.1 

C178 

0.01 

R146 

2.2 k 

2.45V 

C140 

0.1 

R101 

15 k 

C139 

0.022 

R98 

470 k 

IC7C 

NJM2902M 

SEND 

8 

C161 

12 P 

R127 

560 k 

9 

10 

C138 

0.022 

R100 

15 k 

R99 

150 k 

CP2 

2 1 

C32 

5 4 3 0.001 

FI3 ALFY450E 

8 

7 

6 

5 

4 

3 

2 

1 

R22 1.5 k 

L7 

0.1 H 

C63 

22 P 

C66 

12 P 

R12 

1.5 k 

C19 

0.22 

R13 

470 

C18 0.01 


TA31136FN 

C5 

0.001 

Q2 

2SC2714 Y 

R8 

2.2 k 

C12 

0.01 

R51 

100 

Q9 

2SC4215 0 

C65 

0.001 

L8 

0.1 H 

1stLO 

D5 

MA77 

C17 

0.001 

R11 

100 k 

C275 

0.001 

R10 

1.5 k 

C11 

0.001 

C68 

0.01 R54 

2.2 k 

R192 

100 

D6 

C64 

MA77 

470 P C67 

18 P 

3.28V 

R52 

R53 

27 k 

1 k 3.97V 

Q21 

2SC4116 BL 

R96 

2.7 k 

R97 

390 

R126 

100 k 

Q24 2SA1588 GR 

C179 

0.1 

AFOUT 

QUAD 

IFOUT 

RSSI 

N-DET 

N-REC 

GND 

MIXIN 

FILIN 

FILOUT 

DEC 

IFIN 

VCC 

MIXOUT 

OSCOUT 

OSCIN 

R147 

10 k 

R125 

6.8 k 

Q25 

DTC144EU 

R124 

1 k 

RX: 4.94 V 

TX: 0.00 V 

R148 

2.2 k 

1.00V at 3dB RX 

C137 

0.1 

R166 

100 k 

R167 

100 k 

INCOM 

5V 

VBIAS 

AF5 

IC7B 

NJM2902M 

C180 

0.01 

7 

C160 

270 P 

BEEPM 

BPLVL 

R95 R94 

1M 1M 

6 

5 

R123 

56 k 

RMUTS 

SMUTE 

RX: 0.00 V 

TX: 4.94 V 

D14 

DA204U 

MP1 

1 

2 

3 

4 

5 

6 

R93 

1M 

C16 

0.022 

FI2 

FL-310 

C4 C3 

0.001 0.022 

C14 

6 P 

L3 

82 nH 

C10 

15 P 

C71 

0.001 

C70 

10 P 

C267 

18 P 

FI1 

FL-310 

R56 

4.7 k 

L29 

47 nH 

C136 

2.2 

L2 

56 nH 

C268 

18 P 

IC5 BU4066BCFV 

1 

I/O VDD 14 

2 

O/I CONT.A 

3 

O/I CONT.D 12 

13 

4 

I/O I/O 11 

5 

CONT.B O/I 

10 

6 

CONT.C O/I 

7 

VEE I/O 8 

9 

R122 

18 k 

C156 C155 

10 0.01 

R121 

2.2 k 

R149 

15 k 

R150 

1.2 k 

Q26 

DTC144EU 

C182 

0.01 

C159 

0.01 

C9 

10 P 

R7 

3.3 k 

C7 

0.001 

C72 

0.001 

R9 

1.5 k 

L1 

0.82 H 

C254 

0.001 R188 

100 

R59 

10 

L9 

82nH 

R6 

10 

C6 

68 P 

R5 

10 k 

L27 

4.7 H 

R57 R58 C73 

4.7 k 100 0.001 

VBIAS 

5V 

VOL1 

C226 

470 P 

R158 22 

Q1 3SK272 

C225 

12 P 

R60 

1 k 

R3 

10 k C224 

5 P 

C74 

R61 

18 P 

100 

Q10 

2SC3775 3 

D7 

1SS355 

C133 

0.001 

Q20 

2SK1069 4 

C135 

0.01 R168 

100 k R169 

100 k 

4 

2 

1 

3 

11 

IC7A 

NJM2902M 

R152 

1M 

MMUTE 

RMUTM 

R151 22 k 

C183 

0.1 

C184 

0.001 

R198 

100 k 

C181 2.2 

1 

2 

R92 

1 k 

5 

3 

C77 

0.001 

C75 

0.001 

R91 

1M 

R90 

1M 

C134 

0.1 

C227 

0.001 

C223 

12 P 

R62 

1 k 

SAFO 

R170 

100 k 

R113 

100 k 

HV 

HVS 

VOL2 

4 

C76 

0.5 P 

R89 

1M 

C185 

470 

C186 

470 


LA4425A 

C228 

470 P 

L25 

82 nH 

C221 

12 P 

C222 

33 P L24 

82 nH 

R63 

33 

HVS 

HV 

T5 

R64 

33 

L10 

82 nH L30 

47 nH 

C78 

22 P 

C79 C270 

18 P 39 P 

D20 

MA77 

C220 

2 P 

R190 

10 k 

C256 

0.001 

L31 

47 nH 

C271 

18 P 

Q11 

2SC3268 

Q12 

2SB1143 S 

TMUTE 

MICAF 

PTTS 

C188 

47 P 

Q14 

DTA144EU 

R66 

33 k 

C90 

0.01 

VBIAS 

5V 

VOL1 

MMIC 

SMIC 

R68 

10 k 

C218 

1 P 

L22 

82 nH 

R163 

1 k 

IC4 BU4066BCFV 

1 

I/O VDD 14 

2 

O/I CONT.A 

3 

O/I CONT.D 12 

13 

4 

I/O 

I/O 11 

5 

CONT.B O/I 

10 

6 

CONT.C O/I 

7 

VEE I/O 8 

9 

C276 

0.1 

R154 

4.7 

C187 

0.1 

C126 

0.01 

R201 

10 k 

TX_H 9.87V 

TX_L 5.12V 

C127 

47 P 

C249 

0.001 

L26 

0.10 H 

Q27 

2SC4226 R25 

C215 C213 

12 P 47 P 

L21 

82 nH 

C217 

15 P 

C81 C80 

0.001 47 

C132 

0.01 

C216 

33 P 

C214 

5 P 

R191 

10 k 

IC3 SC-1302 

R65 

47 k C84 

1 

Q15 

FMW1 

C82 

0.001 C83 

1000 

2 

C85 

470 P 

R69 

220 

R87 

100 k 

R86 

1M 

D12 

1SS355 

PTTM 

3 

4 

1 

2 

3 

4 

5 1 

R85 

1M 

C253 

0.01 

R70 

10 k 

C128 0.1 

C212 

470 P 

C89 

0.01 

C86 

0.001 

R5 

C252 

0.001 

R157 

47 

R155 

33 k 

R187 

1 k 

C211 

47 P 

C209 

12 P 

D21 C210 

MA728 5 P 

R75 

68 

C98 

0.001 

R76 

470 

C91 C102 

C87 C88 22 P 36 P 

0.01 22 P 

C130 

2.2 

R67 

2.2 k 

C131 

0.1 

Q19 

DTA144EU 

R88 

100 k 

SQLV 

C125 

0.001 

C92 

0.001 

R73 

6.8 k 

VBIAS 

5V 

VOL1 

MMIC 

SMIC 

C129 

2.2 

L20 

82 nH 

C208 

33 P 

Q17 

2SD1664 Q 

R78 

2.2 k 

C103 

0.001 

C207 

12 P 

C99 C100 

0.001 470 P 

R82 

2.7 k 

R81 

10 k 

R84 

8.2 k R83 

1.2 k 

C124 C123 

47 P 47 P 

L19 

82 nH 

R77 

68 

L12 

LA-243 

C104 

0.001 

D8 

HSM88ASR 

R71 

RV-143 

PTT 

HI/LO 

Q18 

DTA144EU 

PTTC 

HV 

GND 

SP+ 

SP— 

5V 

VBIAS 

GND 

SQLV 

5V 

HV 

GND 

VOL2 

VOL1 

HVS 

3.7V 

D19 

MA77 

C206 

2 P 

C101 

0.001 

R185 

10 k 

C251 

0.001 

L11 

LW-25 

R79 

2.2 k 

C93 

0.001 

Q16 

DTC144EU 


PTTC 

VOL1 

5V 

VBIAS 

VCC 

1 

2 

3 

4 

5 

6 

7 

8 

C122 

0.001 

9 

10 


PTT 

J5 

R186 

1 k 

C105 

27 P 

D16 

1SS375 

C204 

1 P 

D9 

HSM88ASR 

W1 

1 

2 

3 

4 

5 

6 

7 

8 

C203 

12 P 

L17 C202 

82 nH 33 P 

D10 

XB15A308 

R74 

100 k 

C201 

12 P 

L16 

82 nH 

C106 

0.001 L13 

LA-243 

C107 

15 P 

C95 

22 P 

C97 

22 P 

C114 C112 

0.01 0.001 

C113 

47 P 

SP+ 

SP— 

PTT 

R80 

100 

C121 C120 

0.001 47 P 

GND 

SQLV 

5V 

HV 

GND 

VOL2 

VOL1 

HVS 

13.83V 

GND 

SQLV 

5V 

C108 

5 P 

TXDET 

13.81V 

C200 

5 P 

C109 

24 P 

C116 

47 P 

1 

2 

3 

1 

2 

3 

4 

5 

C199 

47 P 

L14 

LA-253 

C94 

0.01 

C96 

0.01 

C277 

0.001 

C198 

36 P 

C111 

4 P 

L15 

LA-243 

D15 

XB15A308 

CH16_RX 4.72V 

WX10_RX 0.0V 

W1 

VCC 



PTTC 

D11 

DSA3A1 

C115 

0.001 

C118 

470 P 

PTT 



GND 

1 5 

2 

3 

4 6 

VR-B BOARD 

HV 

GND 

VOL2 

VOL1 

HVS 

TX_H 3.02V 

TX_L 3.26V 

VR-A BOARD 

C197 

27 P 

BPFV 

1 

J1 

2 

J2 

From/to 

EXT SP/MIC 

HV 

From 

DC POWER 

GND 

SP+ 

to EXT SP 

SP 

From smart mic 

1 

5 

(HM-129) 

2 

3 J4 

4 6 MIC 

R1 

100 k 

R1 

100 k 

CHASSIS 

unit 

11 - 2


11 - 3 

J2 

6 

5 

4 

3 

2 

1 

GND 

RXD 

TXD 

RESET 

VPP 

5V 

STXD 

SRXD 

RESET 

VPP 

5V 

5V 

SRXD 

STXD 

47k 

R55 

1k 

R54 

TC7W14FU 


8 

7 

6 

5 

4 

3 

2 

1 

2SA1576 

Q11 

47 

R58 

4.7k 

R57 

RRXDA 

PTT 

0.1 

C46 

2SC4081 

Q10 

RTXDA 

27k 

R51 

1k 

R56 

5V 

0.01 

C45 

0.027 

C42 

2SK1069 

Q9 

S-80928ANMP 


5 

CD 

4 

NC 

3 

VSS 

2 

VDD 

1 

OUT 

100k 

R50 

PTT 

VCC 


AF5V 

from/to MAIN unit J2 

or LOGIC board J1 

RMUTE 

BEEP 

RESET 

VCCSW 

0.1 

C44 

100k 

R53 

PTT 

PWR 

100k 

R18 

DOWN 

UP 

CONT3 

CONT2 

100k 

R15 

100k 

R14 

100k 

R17 

100k 

R16 

RMUTE 

BEEP 

100k 

R10 

5V 

5V 

5V 

5V 

100k 

R13 

100k 

R12 

100k 

R11 

0.01 

C4 

22 

C3 

SEG27 

SEG26 

SEG25 

SEG24 

SEG23 

SEG22 

SEG21 

SEG20 

CONT1 

RESET 

VPP 

CONT1 

CONT2 

CONT3 

DIM1 

DIM2 

VCCSW 

DIM3 

DIM4 

1M 

R19 

SQL 


VOL 

HL 

39k 

R61 

10k 

R60 

10k 

R29 

10k 

R31 

10k 

R33 

20k 

R32 

18k 

R30 

20k 

R28 

15k 

R59 

2SC4116 

Q3 

PWR 

2SC4116 

Q12 

3.9k 

R64 

10k 

R63 

47k 

R62 

0.1 

C38 

1k 

R34 

100 

C39 

330 

C41 

39k 

R52 

DAN202U 

D2 

0.1 

C40 

8V 

CP18 

CP16 

CP14 

100 

R69 

47p 

C52 

47p 

C51 

CP17 

PWRC 

RRXDA 

RTXDA 



J1 

PTTC 

GND 

VCC 

100 

R68 

CP12 

CP15 

1 

C54 

1SS355 

D3 

TC4W53FU 


8 

7 

6 

5 

4 

3 

2 

1 

1M 

R67 

0.001 

C50 

470P 

C47 

22 

R77 

22 

R76 

22 

R75 

CP11 

VCC 

0.1 

C36 

0.1 

C34 

TA78L05F 


TA7808F 


VCC 

5V 

0.01 

C9 

2SB1132 

Q2 

10k 

R27 

NTCCM16084BH 

R26 

10k 

R23 

20k 

R22 

39k 

R21 

2SK1069 

Q1 

0.1 

C7 

1.2k 

R24 

PTT 

VRDAT 

VRCK 

5V 

8V 

BEEP 

RMUTE 

5V 

PTT 

PWRSW 

10k 

R25 

VCCSW 

VRDAT 

VRCK 

0.01 

C5 

CSTCC4.91MG 

X1 

C6 0.01 

DIM3 

DIM2 

DIM1 

µPD789405AGK-A30-9EU 


79 

P41/KR1 78 

P42/KR2 77 

P43/KR3 76 

P44/KR4 75 

P45/KR5 74 

IC 73 

XT1 

72 

XT2 

71 

VDD0 70 

VSS0 69 

X1 

68 

X2 

67 

RESET 66 

P46 

65 

P47 

64 

P00 

63 

P01 

62 

P02 

39 

AVDD 

38 

P80/S27 

37 

P81/S26 

36 

P82/S25 

35 

P83/S24 

34 

P84/S23 

33 

P85/S22 

32 

P86/S21 

31 

P87/S20 

30 

P90/S19 

29 

P91/S18 

28 

P92/S17 

27 

P93/S16 

26 

S15 

25 

S14 

24 

S13 

23 

S12 

22 

S11 

61 

P03 

P66/ANI6 

P65/ANI5 

P64/ANI4 

P63/ANI3 

P62/ANI2 

P61/ANI1/CMPREF 

P60/ANI0/CMPIN0 

AVSS 

WDSW 

SCAN 

CHWX 

CH16 

PWR 

PTT 

MODE 

DOWN 

UP 

BEEP 

STXD 

SRXD 

BPLVL 

P27/INTP3/CPT5 

P26/INTP2/TO5 

P25/INTP1/TI1 

P24/INTP0/TI0 

P23/CMPTOUT0/TO 

P22/SI/RXD 

P21/SO/TXD 

P20/SCK/ASCK 

P53 

P52 

P51 

P50 

40 

AVREF 

21 

S10 

80 

P40/KR0 

SEG10 

SEG19 

SEG18 

SEG17 

SEG16 

SEG15 

SEG14 

SEG13 

SEG12 

SEG11 

10k 

R7 

10k 

R6 

10 

C1 

SKQLLC 

S4 

CP7 

10k 

R8 

PTT 

10k 

R9 

CH16 

6.8k 

R20 

10KEY 

S7 

PTT 

22 

C37 

0.1 

C28 

10 

C30 

AF5V 

22 

C35 

5V 

0.001 

C29 

DTC144EU 

Q5 

DTB123EK 

Q6 

100k 

R45 

0.01 

C53 

1M 

R65 

1M 

R66 

47p 

C32 

100k 

R44 

NJM2125F 


5 

4 

2 

1 

3 


CP6 


SKB-2746 LPC 

MC1 

CP5 

CP4 

470k 

R47 

1 

C33 

1 

C26 

470p 

C27 

12k 

R42 

33k 

R46 

100k 

R41 

33 

R70 

22 

C23 

1 

C24 

2SJ144 

Q4 

0.01 

C25 

0.22 

C31 

0.01 

C22 

470k 

R40 

100k 

R39 

2.7K ERJ3GE 

R43 

M62429FP 


8 

VIN2 

7 

VOUT2 

6 

VCC 

5 

CLK 

4 

DATA 

3 

GND 

2 

VOUT1 

1 

VIN1 

VOL 

VRCK 

PWRSW 

VRDAT 

15k 

R38 

DA204U 

D1 

DOWN 

CHWX 


150 

R3 

SML-311YT 

DS10 

SML-311YT 

DS9 

10KEY 

S11 

10KEY 

S8 

10KEY 

S9 

10KEY 

S6 

SKQLLC 

S3 

SKQLLC 

S2 

120 

R2 

SKQLLC 

S1 

SEG21 

SEG17 

SEG13 

COM3 

COM2 

COM1 

COM0 

SEG0 

SEG1 

SEG2 

SEG3 

SEG4 

SEG5 

SEG6 

SEG7 

SEG8 

SEG9 

SEG10 

SEG11 

SEG15 

SEG19 

MAIN UNIT 

120 

R1 

FY1101F-TR 

DS6 

FY1101F-TR 

DS5 

A0119 

DS1 

SEG25 

SEG23 

SEG24 

SEG20 

SEG16 

SEG12 

SEG13 

SEG14 

SEG15 

SEG17 

SEG18 

SEG19 

SEG21 

SEG22 

SEG23 

SEG25 

SEG26 

SEG27 

SEG24 

SEG20 

SEG16 

SEG12 

SEG13 

SEG14 

SEG15 

SEG17 

SEG18 

SEG19 

SEG21 

SEG22 

SEG23 

SEG25 

SEG9 

SEG8 

SEG7 

SEG6 

SEG5 

SEG4 

SEG3 

SEG2 

SEG1 

SEG0 

COM3 

COM2 

COM1 

COM0 

S9 

S8 

S7 

S6 

S5 

S4 

S3 

S2 

S1 

S0 

COM3 

COM2 

COM1 

COM0 

VSS1 

VLC2 

VLC1 

VLC0 

BIAS 

VDD1 

SEG26 

SEG27 

SEG21 

SEG17 

SEG13 

COM3 

COM2 

COM1 

COM0 

SEG0 

SEG1 

SEG2 

SEG3 

SEG4 

SEG5 

SEG6 

SEG7 

SEG8 

SEG9 

SEG10 

SEG11 

SEG15 

SEG19 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

39 

38 

37 

36 

35 

34 

33 

32 

31 

30 

29 

28 

27 

26 

25 

24 

23 

22 

20 

19 

18 

17 

16 

15 

14 

13 

12 

11 

10 

9 

8 

7 

6 

5 

4 

3 

2 

1 

41 

42 

43 

44 

45 

46 

47 

48 

49 

50 

51 

52 

53 

54 

55 

56 

57 

58 

59 

60 

21 

3 

2 

1 

FY1101F-TR 

DS3 

FY1101F-TR 

DS2 

SML-311YT 

DS4 

PWRSW 

SCAN 

HL 

SML-311YT 

DS7 

SML-311YT 

DS8 

10KEY 

S10 

10KEY 

S5 

0.1 

C11 

1 

C12 

SQL 

0.1 

C10 

10k 

R36 

22k 

R37 

1k 

R35 

UP 

100 

C16 

TA7368F 


10 

POUT 

9 

PWGND 8 

PREGND 7 

PHASE 

6 

NF 

5 

RIPPLE 

4 

VIN 

3 

NC 

2 

VCC 

1 

NC 

100 

C15 

0.1 

C14 

0.047 

C13 

100 

C17 

SP- 

SP+ 

+ 

- 

SP1 

036D0801 

CHASSIS 

CP2 

CP3 

330 

C18 

8 

7 

6 

5 

4 

3 

2 

1

11-4 HM-129 


MC1 

C1 

470 P 

R1 

12 k 

CHASSIS UNIT W1 

PTT 

S1 

W2 

W1 

PTT 



PTTG 

PTT 



GND 

1 

2 

3 

4 

to MAIN unit J4 

UP 

S2 

R2 

6.8 k 

KEYM 

GND 

1 

2 

to LOGIC board J3 

DN 

S3 

R3 

15 k 

UP_ON 2.0V 

DN_ON 3.0V 

16/9_ON 3.8V 

16/9 

S4 

R4 

33 k 

11 - 4

1-1-32, Kamiminami, Hirano-ku, Osaka, 547-0003, Japan 

S-13716IZ-CD 

© 2001 Icom Inc.

IC-M402 Service manual

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