IC-910H Service manual.pdf - N3UJJ
IC-910H Service manual.pdf - N3UJJ IC-910H Service manual.pdf - N3UJJ
5-7 UX-910 ADJUSTMENTSADJUSTMENT2ND LO LOCKVOLTAGE1ST LO LOCKVOLTAGE112ADJUSTMENT CONDITION• Connect an optional UX-910 (1200MHz band unit).• Display frequency: 1270.5000 MHz• Receiving• Display frequency: 1240.0000 MHz• Receiving• Display frequency: 1300.0000 MHz• ReceivingADJUSTMENTMEASUREMENTVALUEPOINTUNIT LOCATION UNIT ADJUSTMAIN(UX-910)MAIN(UX-910)Connect a digitalmultimeter or oscilloscopeto check pointCP701.Connect a digitalmultimeter or oscilloscopeto check pointCP501.2.6–3.8 V6.0–7.0 V3.4–4.4 VVerifyVerifyRECEIVERGAINATT GAINIDLINGPOWERBALLANCETRANSMITTERGAIN11112341• Display frequency: 1280.0000 MHz• Connect a standard signal generatorto [12 ANT] connector and set as:Frequency : 1280.0000 MHzLevelModulation: OFF• Receiving: 710 µV* (–50 dBm)• Display frequency: 1280.0000 MHz• [ATT]: ON• Set an SSG as :Frequency : 1280.0000 MHzLevel : 710 µV* (–50 dBm)Modulation: OFF• Receiving• Display frequency: Any• Mode: CW• Preset R61, R67, R83 to max.clockwise, R13 to max. counterclockwise, and C332 to center.• Connect an RF power meter to [12ANT].• Connect an SSG to the check pointCP311 and set as :Frequency : 10.8500 MHzLevel : OFF• Transmitting• Display frequency: Any• Mode: CW• Connect an SSG to the check pointCP311 and set as :Frequency : 10.8500 MHz• Transmitting• Display frequency: 1240.0000 MHz• Transmitting• Display frequency: 1300.0000 MHz• Transmitting• Display frequency: 1270.0000 MHz• Set an SSG as :Frequency : 10.8500 MHzLevel : 18 mV* (–22 dBm)• TransmittingMAIN(UX-910)MAIN(UX-910)MAIN(UX-910)RearpanelRearpanelConnect a spectramanalyzer to checkpoint CP311.Connect a spectramanalyzer to checkpoint CP311.Connect a digitalmultimeter betweencheck points CP321and CP322.Connect an RFpower meter to [12ANT].Repeat step 2 and step 3 several times until power difference is minimum.Connect an RFpower meter to [12ANT].*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.–34 dBm (16 dB gain)–14 dBm (20 dB of gaindifference between theattenuator ON andOFF.)0.5 Vvoltage difference5 WRead the RF powermeter indication.Same power as step 25 WMAIN(UX-910)MAIN(UX-910)MAIN(UX-910)MAIN(UX-910)MAIN(UX-910)R224R288R13AdjustSSG’slevelVerifyC332R835 - 18From The N3UJJ.COM Document Library
CP321Idling check pointCP322Idling check pointR67APC adjustmentCP401APC check pointCP15APC check pointR288Attenuator adjustmentC332Power ballanceadjustmentR13Idling adjustmentCP5011st LO lock voltagecheck pointR37APC adjustmentR61APC adjustmentR83Transmitter gainadjustmentR224Receiver gainadjustmentCP7012nd LO lock voltagecheck pointCP311Receiver gaincheck point5 - 19From The N3UJJ.COM Document Library
- Page 1 and 2: SERVICEMANUALVHF/UHF ALL MODE TRANS
- Page 3 and 4: TABLE OF CONTENTSSECTION 1SPECIFICA
- Page 5 and 6: ■ RECEIVER• Receive system :VHF
- Page 7 and 8: • PA UNITTX/RX switching relay(RL
- Page 9 and 10: SECTION 3DISASSEMBLY AND OPTION INS
- Page 11 and 12: • UT-102 VOICE SYNTHESIZER UNITq
- Page 14 and 15: 4-1-6 10 MHz IF CIRCUIT (MAIN UNIT)
- Page 16 and 17: While in SSB mode, the amplified si
- Page 18 and 19: The passed signals are then applied
- Page 20 and 21: 5-2 PLL ADJUSTMENTSADJUSTMENT30.2 M
- Page 22 and 23: 5-4 RECEIVER ADJUSTMENTSReceiver ad
- Page 24 and 25: RECEIVER ADJUSTMENTS (continued)ADJ
- Page 26 and 27: 5-5 TRANSMITTER ADJUSTMENTSADJUSTME
- Page 28 and 29: TRANSMITTER ADJUSTMENTS (continued)
- Page 30 and 31: 5-6 SOFTWARE ADJUSTMENTADJUSTMENT A
- Page 32 and 33: SOFTWARE ADJUSTMENT (continued)ADJU
- Page 34 and 35: SOFTWARE ADJUSTMENT (continued)ADJU
- Page 38 and 39: UX-910 ADJUSTMENTS (continued)ADJUS
- Page 40 and 41: SECTION 6PARTS LIST6-1 IC-910[FRONT
- Page 42 and 43: [DISPLAY BOARD]REFNO.ORDERNO.DESCRI
- Page 44 and 45: [PLL UNIT]REF ORDERNO. NO.DESCRIPTI
- Page 46 and 47: [PLL UNIT]REF ORDERNO. NO.DESCRIPTI
- Page 48 and 49: [MAIN UNIT]REF ORDERNO. NO.DESCRIPT
- Page 50 and 51: [MAIN UNIT]REF ORDERNO. NO.DESCRIPT
- Page 52 and 53: [MAIN UNIT]REF ORDERNO. NO.DESCRIPT
- Page 54 and 55: [MAIN UNIT]REF ORDERNO. NO.DESCRIPT
- Page 56 and 57: [PA UNIT]REFNO.ORDERNO.DESCRIPTIONI
- Page 58 and 59: [PA UNIT]REF ORDERNO. NO.DESCRIPTIO
- Page 60 and 61: [PA UNIT]REF ORDERNO. NO.DESCRIPTIO
- Page 62 and 63: [PA UNIT]REF ORDERNO. NO.DESCRIPTIO
- Page 64 and 65: 6-2 UX-910[MAIN UNIT]REFNO.ORDERNO.
- Page 66 and 67: [MAIN UNIT] — UX-910REF ORDERNO.
- Page 68 and 69: [MAIN UNIT] — UX-910REF ORDERNO.
- Page 70 and 71: SECTION 7MECHANICAL PARTS[FRONT UNI
- Page 72 and 73: MP34 (CH)MP34 (CH)MP12 (CH)MP1851 (
- Page 74 and 75: SECTION 8SEMI-CONDUCTOR INFORMATION
- Page 76 and 77: • DIODES1SS301 1SS355 1SS375-TL 1
- Page 78 and 79: • BOTTOM VIEW (RIT BOARD)• BOTT
- Page 80 and 81: • BOTTOM VIEW (VARISTOR-A BOARD)
- Page 82 and 83: • BOTTOM VIEW (DISPLAY BOARD)J10
- Page 84 and 85: • BOTTOM VIEW (PA UNIT)64133 416F
5-7 UX-910 ADJUSTMENTSADJUSTMENT2ND LO LOCKVOLTAGE1ST LO LOCKVOLTAGE112ADJUSTMENT CONDITION• Connect an optional UX-910 (1200MHz band unit).• Display frequency: 1270.5000 MHz• Receiving• Display frequency: 1240.0000 MHz• Receiving• Display frequency: 1300.0000 MHz• ReceivingADJUSTMENTMEASUREMENTVALUEPOINTUNIT LOCATION UNIT ADJUSTMAIN(UX-910)MAIN(UX-910)Connect a digitalmultimeter or oscilloscopeto check pointCP701.Connect a digitalmultimeter or oscilloscopeto check pointCP501.2.6–3.8 V6.0–7.0 V3.4–4.4 VVerifyVerifyRECEIVERGAINATT GAINIDLINGPOWERBALLANCETRANSMITTERGAIN11112341• Display frequency: 1280.0000 MHz• Connect a standard signal generatorto [12 ANT] connector and set as:Frequency : 1280.0000 MHzLevelModulation: OFF• Receiving: 710 µV* (–50 dBm)• Display frequency: 1280.0000 MHz• [ATT]: ON• Set an SSG as :Frequency : 1280.0000 MHzLevel : 710 µV* (–50 dBm)Modulation: OFF• Receiving• Display frequency: Any• Mode: CW• Preset R61, R67, R83 to max.clockwise, R13 to max. counterclockwise, and C332 to center.• Connect an RF power meter to [12ANT].• Connect an SSG to the check pointCP311 and set as :Frequency : 10.8500 MHzLevel : OFF• Transmitting• Display frequency: Any• Mode: CW• Connect an SSG to the check pointCP311 and set as :Frequency : 10.8500 MHz• Transmitting• Display frequency: 1240.0000 MHz• Transmitting• Display frequency: 1300.0000 MHz• Transmitting• Display frequency: 1270.0000 MHz• Set an SSG as :Frequency : 10.8500 MHzLevel : 18 mV* (–22 dBm)• TransmittingMAIN(UX-910)MAIN(UX-910)MAIN(UX-910)RearpanelRearpanelConnect a spectramanalyzer to checkpoint CP311.Connect a spectramanalyzer to checkpoint CP311.Connect a digitalmultimeter betweencheck points CP321and CP322.Connect an RFpower meter to [12ANT].Repeat step 2 and step 3 several times until power difference is minimum.Connect an RFpower meter to [12ANT].*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.–34 dBm (16 dB gain)–14 dBm (20 dB of gaindifference between theattenuator ON andOFF.)0.5 Vvoltage difference5 WRead the RF powermeter indication.Same power as step 25 WMAIN(UX-910)MAIN(UX-910)MAIN(UX-910)MAIN(UX-910)MAIN(UX-910)R224R288R13AdjustSSG’slevelVerifyC332R835 - 18From The <strong>N3UJJ</strong>.COM Document Library
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