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8-46 Maintenance: 800 MHz Troubleshooting Charts

8.14.6 Troubleshooting Flow Chart for Transmitter (for PCB No. 8480641Z02/

8480641Z03)

Is the fuse

F501 OK?

Is there a

short circuit

after C113?

Is overall

radio current

between 0.8

and 1.3 A

when

transmitting?

Is the voltage

at pin 4 of

U102

between 2V

and 5.6V?

Is the voltage

at pin 32 of

U102 between

6V and 9V?

START

No Power out or Low

Power

Yes

Check L101, L102, C101,

CR101 for open circuit

Find and remove

short circuit from

antenna switch or

harmonic filter

Low Power

Yes

Replace F501

Yes

Replace

U102

Is the voltage

at R105 and

C116 between

1.8V and

2.2V?

Is the voltage

at pins 6, 5, 8, 9 of

U101 between 5.5V

and 7.5V?

Yes

Troubleshoot

VCO

Replace

U101

Replace

Q101

No Power

Yes

Is the

voltage at pin 24

of U102 between

2V and 5V for High

Power, 0V for

Low Power?

Default Chapter2
Chapter 1 Introduction25
Chapter 2 Radio Power Distribution29
- Figure 2-1. DC Power Distribution Block Diagram29
Chapter 3 Keypad31
Chapter 4 UHF Band 1 Theory of Operation35
Chapter 5 UHF Band 2 Theory of Operation43
Chapter 6 VHF Theory of Operation51
Chapter 7 Low Band, 800 Mhz, Passport & 900 Mhz Theory of Operation63
Chapter 8 Maintenance91
Chapter 9 Schematic Diagrams, Overlays, and Parts Lists151

Battery Type	Li-Ion
Waterproof	IP54
Operating Temperature	-30°C to +60°C
Frequency Range	VHF: 136-174 MHz
Number of Channels	16

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