DAD 1201

MODEL: DAD 1201
SPECIFICATIONS
DAD 1201 CLASS D Power Amplifier
class “D” technology
input voltage 11-14.4 VOC
frequency response 15Hz~150Hz
S/N ratio [A-weight] >95dB
input level 0.17V~8V
T.H.D. 0.05%
input impedance 10K ohm
low pass crossover variable frequency 50Hz~150Hz
crossover slope 12dB/oct
variable bass boost 0-18dB@45Hz
variable subsonic filter 10~40Hz 12dB/oct
remote subwoofer level control included
phase 0~180°
quiet ON/OFF
lit logo Dragster
fuse rating 40A×4
overall dimensions 186×490×56 mm
- 1 -
Service Manual

To engineers in charge of repair or inspection of
our products.
Before repair or inspection, make sure to follow the instructions so that customers
and Engineers in charge of repair or inspection can avoid suffering any risk or injury.
1. Use specified parts.
The system uses parts with special safety features against fire and voltage. Use only
parts with equivalent characteristics when replacing them. The use of unspecified
parts shall be regarded as remodeling for which we shall not be liable. The onus of
product liability (PL) shall not be our responsibility in cases where an accident or
failure is as a result of unspecified parts being used.
2. Place the parts and wiring back in their original positions after replacement or
re-wiring. For proper circuit construction, use of insulation tubes, bonding, gaps to
PCB, etc, is involved. The wiring connection and routing to the PWB are specially
planned using clamps to keep away from heated and high voltage parts. Ensure that
they are placed back in their original positions after repair or inspection. If extended
damage is caused due to negligence during repair, the legal responsibility shall be
with the repairing company.
3. Check for safety after repair. Check that the screws, parts and wires are put back
securely in their original position after repair. Ensure for safety reasons there is no
possibility of secondary ploblems around the repaired spots. If extended damage is
caused due to negligence of repair, the legal responsibility shall be with the repairing
company.
4. Caution in removal and making wiring connection to the parts for the automobile.
Disconnect the battery terminal after turning the ignition key off. If wrong wiring
connections are made with the battery connected, a short circuit and/or fire may occur.
If extensive damage is caused due to negligence of repair, the legal responsibility
shall be with the repairing company.
5. Cautions regarding chips.
Do not reuse removed chips even when no abnormality is observed in their
appearance. Always replace them with new ones. (The chip parts include resistors,
capacitors, diodes, transistors, etc). The negative pole of tantalum capacitors is
highly susceptible to heat, so use special care when replacing them and check the
operation afterwards.
6. Cautions in handling flexible PCB
Before working with a soldering iron, make sure that the iron tip temperature is
around 270... Take care not to apply the iron tip repeatedly(more than three times)
to the same patterns. Also take care not to apply the tip with force.
7. Turn the unit OFF during disassembly and parts replacement. Recheck all work
before you apply power to the unit.
- 2 -

EXPLODED VIEW
- 3-

CIRCUIT DIAGRAM 1
DAD 1201
- 4 -

CIRCUIT DIAGRAM 2
DAD 1201
- 5 -

CIRCUIT DIAGRAM 3
DAD 1201
- 6 -

PRINTED CIRCUIT BOARD - 1
- 7 -

PRINTED CIRCUIT BOARD - 2
- 8 -

PRINTED CIRCUIT BOARD - 3
- 9 -

PRINTED CIRCUIT BOARD - 4
- 10 -

PRINTED CIRCUIT BOARD - 5
- 11 -

PRINTED CIRCUIT BOARD - 6
- 12 -

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1C-E47625B50A1M E Cap 47UF/25V
C1 C11 C16 C37-38 C50-51 C103 C118-119
C126 C152 C156
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PARTS LIST - 1
- 13 -

3
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1C-R104A0X7035J M Cap 104J/100V
C4 C65-66 C8-10 C13 C15 C33-36 C42 C59-60
C100 C105-106
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1R-OA100X05BXXX Resistor 10Ω 3
1
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1R-OA101X05BXXX Resistor 100Ω 1/8W
R80-81 R83 R88 R101 R121 R201 7
1R-OA104X05BXXX Resistor 100K 1/8W
R155 R104 R163 R194 R78 R103 6
1R-OA103X05BXXX Resistor 10K 1/8W
R31-34 R42 R16-17 R74-75 R77 R79 R89 R96
R122 R125 R151-154 R157 R164 R166-167
R24 R26-27 R190 R210 R217 R116 R197
R216• •REM• • R9
33
1R-OA151X05BXXX Resistor 150Ω 1
4
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1
PARTS LIST - 2
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1
7
4
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W
8
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1
9
9
3
R
6
7
R
5
9
R
6
5
1
R
2
4
1
-
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4
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8
3
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2
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2
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R
1
1R-OA203X05BXXX Resistor 20K 1/8W
R127 R131 R133 R140 R119-120 R111 R35
R73 R180-182 R213 R126 R218-219 R512
17
3
7
4
1
R
5
4
1
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9
0
1
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8
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K
4
2
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3
4
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1
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8
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2
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3
7
2
A
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R
1
1R-OA220X05BXXX Resistor 22Ω 1
1
R
W
8
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1
1R-OA221X05BXXX Resistor 220Ω 8
3
2
1
R
0
0
1
R
9
5
-
8
5
R
0
5
R
7
3
R
5
-
4
R
W
8
/
1
1R-OA271X05BXXX Resistor 270Ω 3
3
4
1
R
8
5
1
R
4
4
1
R
W
8
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1
2
8
2
R
1
1
2
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4
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1
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3
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1
1R-OA470X05BXXX Resistor 47Ω 7
1
0
1
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5
7
1
-
8
6
1
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0
5
1
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7
5
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4
5
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3
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8
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1
1R-OA431X05BXXX Resistor 430Ω 1
8
0
1
R
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8
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1
1R-OA471X05BXXX Resistor 470Ω 2
2
2
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6
3
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8
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1
1R-OA561X05BXXX Resistor 560Ω 2
4
8
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2
8
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1
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1
1R-OA821X05BXXX Resistor 820Ω 1/8W R115 R215• •REM• • 2
2
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A
F
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R
1
PARTS LIST - 3
- 15 -

1R-FA220X05EXXX Resistor 22Ω 1
9
4
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2
6
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4
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1
1R-FA530X05GXXX Resistor 53Ω 6
3
5
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9
4
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8
4
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5
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C
PARTS LIST - 4
- 16 -