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Maintenance: Low Band Troubleshooting Charts 8-37

8.13.3 Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)

IF Signal at

L301?

RF Signal at

T501?

RF Signal

at collector

Q509?

RF Signal at

C504?

RF Signal at

C147?

No or

Check transmit harmonic filter, antenna

switch and J101

Check filter between C147 &

C504

Inject RF into J101

Yes

Check RF amp (Q509)

Stage

Check filter between Q509&

T301

Yes

Check T501, T502, D501,

R507, R508, R509,C516,L508

Yes

1st LO O/P

310OK?

Locked?

Yes

Check FGU

Yes

Trace IF signal from

L301 to U301. Check

for bad XTAL filter

Yes

U301 drain

OK?

IF signal

present?

Before replacing U303,

check U303 voltages;

trace IF signal path

Yes

Biasing on U301

OK?

Troubleshoot biasing,

AGC circuits and U301

Yes

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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