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Maintenance: 900 MHz Troubleshooting Charts 8-57

8.17.6 Troubleshooting Flow Chart for Receiver (for PCB No. 8471203M01)

(Sheet 2 of 2)

IF Signal at

L305?

RF Signal at

pin 8 of U301?

RF Signal at

C316?

Check RF amp Q302 Stage

Inject RF into J101

Check filter FL301 and

associated circuitry

Check U301, C323 and

R320.

Yes

1st LO O/P

OK?

Locked?

Yes

Check FGU

Yes

Trace IF signal from

L305 to Q350.

Check for bad XTAL

filter.

Yes

Q350 collector

OK?

IF signal present?

Before replacing

U350, check U350

voltages; trace IF

signal path.

Yes

Check for 3.0VDC

@ Q350-C

Is 5V supply

present?

Check U202.

Yes

RF Signal at

C302?

Yes

Check harmonic filter L104 & L105 and

antenna switch CR101, CR102 and

associated components.

No or

weak RF

Check filter FL300 &

associated circuitry.

Yes

RF Signal at

C300?

No or

weak RF

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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