Icom IC-910H service manual Section Board Layouts

Page 75

SECTION 9

BOARD LAYOUTS

9-1 VR-A BOARD

9-3 RIT BOARD

• TOP VIEW

• TOP VIEW

2 6

J1

GND

NC

MSVR

MAVR

NC

+5V

1 5

to DISPLAY board J2

9-2 VR-B BOARD

• TOP VIEW

2					6
J1		NC		SFVR		+5V


	GND		RIVR		NC

1					5

to DISPLAY board J10

2					6
J1		NC		SSVR		+5V


	GND		SAVR		NC

1					5

to DISPLAY board J11

9 - 1

Image 75

Contents Service Manual EUR IntroductionOrdering Parts Repair NotesTable of Contents General SpecificationsReceiver FM if IC SectionInside Views Main and PLL UnitsPA Unit TOP View Bottom ViewPLL IC Disassembly and Option Instructions Opening the transceiver’s caseUX-910 1200MHz Band Unit Opening the PA unit cover FL-132/FL-133 CW Narrow FilterMain SUB UT-106 DSP Unit Installing 1st DSP unit front panel sideInstalling 2nd DSP unit rear panel side UT-102 Voice Synthesizer UnitCR-293 High Stability Crystal Unit Receiver Circuit Circuit DescriptionSquelch Circuit Main Unit 6 10 MHz if Circuit Main UnitDemodulator Circuit Main Unit Squelch Control Circuit Main UnitMeter Circuit Main Unit Transmitter CircuitsNoise Blanker Circuit Main Unit AGC Circuit Main UnitRF Circuit PA Unit Transmit if Amplifier Circuit Main UnitModulation Circuit Main Unit CW Keying Circuit Main UnitPLL Circuits PLL Circuits 7 1LO PLL Circuit8 2LO PLL Circuit ‘ Connections Adjustment ProceduresPreparation Before Sarvicing Required Test EquipmentFrequency Adjustment PLL AdjustmentsPLL and Main Units Receiver Adjustments L354 R360 R547P501 L353Main Band OFF EXTNoise BlankerCP852 L283L22 CP851Transmitter Adjustments R131 R503C659 R138LO Leak If TotalMain Gain GNDR1613 R504R202 CP1613Software Adjustment Meter Software AdjustmentNoise SQL Calibration FilterTX Power Deviation HPF OFFLPF UX-910 Adjustments R13 CP321CP322 C332APC Power SETPre-setting for APC adjustment Section Parts List Front UnitDisplay Board Resistor ERA3YED Func Board VR-A BoardVR-B Board PLL Unit RIT BoardJack Board MIC BoardResistor ERA3YEB Thermistor Tantalum ECST1AD107R REG BA09T Main UnitDiode DAN222TL Resistor ERA3YKD R364 7030003320 R915 7030003520 Tantalum Temsva 1C 335M-8L Electrolytic ECEV1EA4R7SR Electrolytic Relay Diode HSU88TRF Coil Eljre 15NG-F Resistor ERJ1WYJ181U Resistor ERJ1TYJ102U JB 1H JB 1C Mica BARISTOR-C Board DRV BoardBARISTOR-A Board VARISTOR-B BoardMain Unit UX-910 2UX-910MAIN UnitResistor RGB3L R15 Resister ERA3YED Tantalum ECST1CC226R CH 1H Connectot 25FMN-BTK Chassis Parts Mechanical PartsDisplay Unit Cover PartsUX-910 Unpacking UnpackingUX-910 Chassis Parts UX-910 Main Unit Transistors and FET’S SEMI-CONDUCTOR InformationDTA114 EE TL MA29B DiodesSection Board Layouts Page Icom America Inc 13714HZ-C1