3-2 Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)
1.1 Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
IF Signal at
pin 2 of
U1051
No
RF Signal
at pin 3 of
U1051?
RF Signal at
C1017?
No
RF Signal at
C1013?
No
RF Signal at
C1002?
No or
Check harmonic filters J1401 and ant.switch
Check preselector and RF
amp.
Inject RF into J1401
No
Yes
Check RF amp (Q1001)
Stage.
Check filter between C1017
& mixer U1051
Yes
Check for detailed mixer.
Yes
1st LO level
OK?
Locked?
Yes
Check FGU
Yes
Trace IF signal from
C1036 to Q1106.
Check for bad
XTAL filter.
No
Yes
IF signal at
Q1106 collec-
tor?
Before replacing
U1103, check
U1103 voltages.
Yes
Is 9V3 present?
Check Supply Voltage cir-
cuitry. Check U0681,
U3211 and U0641.
No
No
Yes
A
B
weak RF
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