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Service Manual

4. Connect the palm microphone to the radio (via front-panel connector). When the palm microphone is

not in use, hang it on the microphone hanger.

581

Table of Contents

Default Chapter2
- Preface2
- Table of Contents3
1 Revision History7
2 Copyright Information8
3 Disclaimer9
4 Product Overview10
- Intended User10
5 Product Controls11
- Front Panel11
- Rear Panel12
- Power Supply13
- Keys13
- LCD Display13
- Diagram of Front Panel13
- Leds and Backlight14
- MMC14
- Audio Output14
- Volume Control14
7 Baseband Section15
- Power Section15
- Power On/Off16
- Clock17
- Interface Distribution17
- Audio Section22
- PCB Difference25
- Watchdog Circuit25
8 GPS Circuit26
- Circuit Description26
- Schematic Diagram26
- Diagram of GPS Circuit26
- Parts List27
- Troubleshooting Flow Chart28
9 Tuning Description29
10 Interface Definition30
11 UHF1 (400-470Mhz 25W) Information33
- Transmitter Circuit33
- Receiver Circuit35
- Receiver Back-End36
- Frequency Generation Unit (FGU)36
- Parts List60
- Troubleshooting Flow Chart95
  - Description of Normal Situations96
  - Fgu99
12 UHF1 (400-470Mhz 45W) Information101
- Transmitter Circuit101
- Receiver Circuit103
- Frequency Generation Unit (FGU)104
- PCB View107
- Block Diagram111
- Schematic Diagram114
- Parts List128
- Troubleshooting Flow Chart163
13 UHF2 (450-520Mhz 25W) Information169
- Transmitter Circuit169
- Receiver Circuit171
- Frequency Generation Unit (FGU)172
- PCB View175
- Block Diagram179
- Schematic Diagram182
- Parts List196
- Troubleshooting Flow Chart232
14 UHF2 (450-520Mhz 45W) Information238
- Transmitter Circuit238
- Receiver Circuit240
- Frequency Generation Unit (FGU)241
- PCB View244
- Block Diagram248
- Schematic Diagram251
- Parts List265
- Troubleshooting Flow Chart301
15 UHF3 (350-400Mhz 25W) Information307
- Transmitter Circuit307
- Receiver Circuit309
- Frequency Generation Unit (FGU)310
- PCB View313
- Block Diagram317
- Schematic Diagram320
- Parts List334
- Troubleshooting Flow Chart370
16 UHF3 (350-400Mhz 45W) Information376
- Transmitter Circuit376
- Receiver Circuit378
- Frequency Generation Unit (FGU)379
- PCB View382
- Block Diagram386
- Schematic Diagram389
- Parts List403
- Troubleshooting Flow Chart439
17 VHF (136-174Mhz 25W) Information445
- Transmitter Circuit445
- Receiver Circuit447
- Frequency Generation Unit (FGU)448
- PCB View451
- Block Diagram455
- Schematic Diagram458
- Parts List472
- Troubleshooting Flow Chart509
18 VHF (136-174Mhz 50W) Information515
- Transmitter Circuit515
- Receiver Circuit517
- Frequency Generation Unit (FGU)518
- PCB View521
- Block Diagram525
- Schematic Diagram528
- Parts List542
- Troubleshooting Flow Chart579
19 Disassembly and Assembly585
20 Exploded View588
21 Packing Guide591
22 Specifications592

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