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3-2

Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)

1.1

Inject RF into J3401

IF Signal at

C3035?

RF Signal at

T3001?

RF Signal at

C3012?

RF Signal at

C3008?

No or

weak RF

RF Signal at

C3474?

Check Harmonic Filter

J3401 and

Antenna Switch

D3471,D3472,L3472

Trace IF signal from

Yes

C3035 to Q3101.

Check for bad XTAL

filter

1st

Yes

LO level OK?

Locked?

Yes

Check filter between

C3012 & T3001

Yes

Check RF amp

(Q3001) Stage

Check filter between C3474

Yes

& C3008. Check tuning

voltage at R3019

IF signal at Q3102

Check FGU

Check T3001, T3002,

D3031, R3030-R3034,

L3032, C3034 and C3035

Check for 5VDC

Is 9V3 present?

Check Supply Voltage

circuitry. Check Q0681,

U3211 and U0641

Is tuning

Yes

voltage OK?

Check U3501

TROUBLESHOOTING CHARTS

Yes

collector?

Before replacing

U3101, check

U3101 voltages

Yes

Check varactor filter