TP620 Service Manual
Contents
1.
Overview ................................................................................................................................................... 1
1.1.
Scope ............................................................................................................................................................... 1
1.2.
Safety Precaution ............................................................................................................................................. 1
2.
Introduction.............................................................................................................................................. 2
2.1.
External Views and Functional Keys................................................................................................................ 2
2.2.
LED Indicator ................................................................................................................................................... 2
3.
Circuit Description .................................................................................................................................. 3
3.1.
Tx/Rx Signal Procedure ................................................................................................................................... 3
3.1.1.
Tx Circuit ....................................................................................................................................................... 3
3.1.2.
Rx Circuit ....................................................................................................................................................... 4
3.1.3.
Frequency Synthesizer Circuit ...................................................................................................................... 6
3.2.
Power Section .................................................................................................................................................. 7
4.
Function Description and Parameter Settings ..................................................................................... 8
4.1.
Conventional Functions ................................................................................................................................... 8
4.2.
Function Parameter Settings ........................................................................................................................... 8
5.
Assemble and Disassemble Instructions ........................................................................................... 11
5.1.
Attaching and Detaching the Battery ............................................................................................................. 11
5.2.
Attaching the antenna .................................................................................................................................... 12
5.3.
Attaching the Speaker /Microphone ............................................................................................................... 13
5.4.
Attaching the Belt Clip .................................................................................................................................... 13
5.5.
Separating the Shell from the Chassis .......................................................................................................... 13
5.6.
Separating the Aluminum Shell from the Main Board .................................................................................... 14
5.7.
Exploded View ............................................................................................................................................... 15
6.
Adjustment and Test ............................................................................................................................. 17
6.1.
Components for Adjustment ........................................................................................................................... 17
6.2.
Adjustment Test Method ................................................................................................................................ 17
6.2.1.
Frequency Description ................................................................................................................................ 17
6.2.2.
Test Tools .................................................................................................................................................... 18
6.2.3.
Tx Test and Modulation ............................................................................................................................... 18
6.2.4.
Rx Test and Modulation ............................................................................................................................... 20
7.
Technical Functions and Specifications ............................................................................................. 21
8.
Maintenance and Test Equipment ....................................................................................................... 23
9.
Troubleshooting .................................................................................................................................... 24
Appendix ....................................................................................................................................................... 25
List 1 Material List (Electronic Section 400-470MHz) ............................................................................................. 25
List 2 Material List (Electronic Section 136-174MHz) ............................................................................................. 35
List 3 Material List (structure material) .................................................................................................................... 46
Figure 1 TP620 Main Board Top Side PCB View(400-470MHz) ............................................................................ 48
Figure 2 TP620 Main Board Bottom Side PCB View(400-470MHz) ....................................................................... 48
Figure 3 TP620 Main Board Top Side PCB View(136-174MHz) ............................................................................ 49
Figure 4 TP620 Main Board Bottom Side PCB View(136-174MHz) ....................................................................... 49
Figure 5 TP620 Mainboard Schematic Diagram(400-470MHz) ............................................................................. 50
Figure 6 TP620 Mainboard Schematic Diagram(134-174MHz) ............................................................................. 56
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Summary of Contents for TP620
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