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IC-910H service manual
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78 pages, 5.19 Mb
SERVICE
MANUAL
VHF/UHF ALL
MODE TRANSCEIVER
i910H
Contents
Main
INTRODUCTION
DANGER
ORDERING PARTS
REPAIR NOTES
TABLE OF CONTENTS
SECTION 1 SPECIFICATIONS
GENERAL
TRANSMITTER
RECEIVER
SECTION 2 INSIDE VIEWS
2-1 IC-910H
MAIN ANDPLL UNITS
PAUNIT
2-2 UX-910 (OPTIONAL UNIT)
BOTTOM VIEW
SECTION 3 DISASSEMBLYAND OPTION INSTRUCTIONS
Opening the transceivers case
CAUTION:
UX-910 1200MHz BAND UNIT
WARNING!
WARNING!
UT-102 VOICE SYNTHESIZER UNIT
UT-106 DSP UNIT
RECOMMENDATION:
Installing 1st DSP unit (front panel side)
Installing 2nd DSP unit (rear panel side)
CR-293 HIGH STABILITY CRYSTAL UNIT
SECTION 4 CIRCUIT DESCRIPTION
4-1 RECEIVER CIRCUIT
4-1-1 VHF TRANSMIT/RECEIVE SWITCHING CIRCUIT (PAUNIT)
4-1-2 VHF RF CIRCUIT (PAUNIT)
4-1-3 VHF 1ST MIXER CIRCUIT (PAUNIT)
4-1-6 10 MHz IF CIRCUIT (MAIN UNIT)
4-1-7 DEMODULATOR CIRCUIT (MAIN UNIT)
4-1-8 SQUELCH CONTROL CIRCUIT (MAIN UNIT)
4-1-9 SQUELCH CIRCUIT (MAIN UNIT)
4-1-10 AF AMPLIFIER CIRCUIT (MAIN UNIT)
4-2 TRANSMITTER CIRCUITS
4-2-1 MICROPHONE AMPLIFIER CIRCUIT (MAIN UNIT)
4-2-2 MODULATION CIRCUIT (MAIN UNIT)
4-2-3 CW KEYING CIRCUIT (MAIN UNIT)
4-2-4 TRANSMIT IF AMPLIFIER CIRCUIT (MAIN UNIT)
4-2-5 RF CIRCUIT (PAUNIT)
4-2-6 DRIVE AMPLIFIER CIRCUIT (PAUNIT)
4-3 PLL CIRCUITS
4-3-1 VHF PLL CIRCUIT (PLL UNIT)
4-3-2 UHF PLL CIRCUIT (PLL UNIT)
4-4 UX-910 (1200 MHz BAND UNIT)
4-4-1 ANTENNA SWITCHING CIRCUIT (for RX)
4-4-2 1200 MHz RF CIRCUIT (for RX)
4-4-3 1200 MHz 1ST/2ND MIXER CIRCUITS (for RX)
4-4-4 IF AMPLIFIER CIRCUIT (for TX)
4-4-5 DRIVE/POWER AMPLIFIER CIRCUITS (for TX)
4-4-6 PLL CIRCUITS
SECTION 5 ADJUSTMENT PROCEDURES
4-1 PREPARATION BEFORE SARVICING
IC-910H
REQUIRED TEST EQUIPMENT
CONNECTIONS
5-2 PLL ADJUSTMENTS
5-3 FREQUENCY ADJUSTMENT
Page
5 - 4
5-4 RECEIVER ADJUSTMENTS
Page
RECEIVER ADJUSTMENTS (continued)
5 - 6
Page
5 - 8
5-5 TRANSMITTER ADJUSTMENTS
Page
5 - 10
TRANSMITTER ADJUSTMENTS (continued)
Page
5 - 12
5-6 SOFTWARE ADJUSTMENT
CAUTION: NEVER
5 - 13
5 - 14
5 - 15
5 - 16
5 - 17
5 - 18
5-7 UX-910 ADJUSTMENTS
Page
5 - 20
UX-910 ADJUSTMENTS (continued)
Page
[DISPLAYBOARD]
6-1 IC-910
[FRONT UNIT]
6 - 1
SECTION 6 PARTS LIST
[DISPLAYBOARD]
[DISPLAYBOARD][DISPLAYBOARD]
6 - 2
[DISPLAYBOARD][DISPLAYBOARD]
6 - 3
[FUNC BOARD]
[VR-A BOARD]
[VR-B BOARD]
[PLL UNIT][RIT BOARD]
6 - 4
[JACK BOARD]
[MIC BOARD]
6 - 5
6 - 6
6 - 7
[MAIN UNIT][PLL UNIT]
6 - 8
6 - 9
6 - 10
6 - 11
6 - 12
6 - 13
6 - 14
6 - 15
6 - 16
6 - 17
6 - 18
6 - 19
6 - 20
6 - 21
6 - 22
6 - 23
[DRV BOARD][PAUNIT]
6 - 24
[BARISTOR-A BOARD]
[VARISTOR-B BOARD]
[BARISTOR-C BOARD]
6-2 UX-910
[MAIN UNIT]
6 - 25
6 - 26
6 - 27
6 - 28
6 - 29
6 - 30
SECTION 7 MECHANICAL PARTS
[FRONT UNIT]
[COVER PARTS]
[DISPLAYUNIT]
[VR-A BOARD]
[PA UNIT]
[UX-910 CHASSIS PARTS]
[PLL UNIT]
[MAIN UNIT]
[DRV BOARD]
SECTION 8 SEMI-CONDUCTOR INFORMATION
(Symbol: TGR) (Symbol: P2) (Symbol: IJ) (Symbol: K1) (Symbol: UP)
2SK882 GR 2SK1577 2 T7 2SK1740 2SK1829 2SK2854
2SA1162 GR 2SA1586 GR 2SA1588 GR 2SB1132 T100 R 2SB1133 R
2SB1201 S 2SC2712 BL 2SC2712 GR 2SC2714 O 2SC3102
8 - 2
2SK2855 2SK2973 2SK2975 3SK131 T2 LA 3SK177 T1B U73
XP4315 XP4601
3SK241 R CPH3404-TL DTA114 EE TL DTA114EUA T106 DTA144EUA T106
DTC114EUA T106 DTC114TUA T106 DTC144EUA T106 DTC144TU T107 FMW1 T148
DIODES
NC
9-1 VR-A BOARD
SECTION 9 BOARD LAYOUTS
9-3 RIT BOARD
9-2 VR-B BOARD
Page
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