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Maintenance: 900 MHz Troubleshooting Charts 8-53

8.17.2 Troubleshooting Flow Chart for Controller (Sheet 2 of 2)

7.5V at

Pin 3/5 U202?

4/3.3V at Pin 1

U203.

5V at U202?

3.3V at U203?

MCU Check.

Power Up

Alert Tone

OK?

Speaker

OK?

U409 EXTAL=

7.3728 MHz?

U201 Pin 19

16.8 MHz.

U409 Reset

Pin 94 High?

MCU is OK.

Not able to

program RF

Board ICs.

Before replacing

MCU, check SPI

clock, SPI data,

and RF IC select.

Replace

Speaker.

Read Radio

OK?

Check

Setup.

Reprogram the

correct data.

See FGU

Troubleshooting.

Check

Q400.

Replace

U202/U203.

Check any short to

SWB+,

Vdda or Vddd.

YES

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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