Receiver Front
End
Circuit Board
TROUBLESHOOTING CHART
NOTE: Heath part numbers that correspond to the circuit
component numbers will be found in the Parts
List
starting
on Page
11
of this Manual.
SYMPTOM
Reseleftor filter or filters
cannot
be
aligned properly.
.
No HFO injection at
G2 Q701.
.
No VFO injection at
G2 Q704.
No
8.65
MHz
output at drain of
0701.
No
3.395
MHz
wgut
at pin
1.
No
+11
V
at pin
13
in receive mode.
.
POSSIBLE CAUSE
1.
Alignment cable soldered to
wrong foil on counter board.
2.
Filter coils interchanged beiween
filters.
3.
Switching diodes installed backwards,
defective, or not properly biased.
D701
-
D718.
1.
Check pin
6.
If no signal, inter-
connecting cable may be improperly
installed or defective. Check pin
2
on board
D.
2.
Q703.
1.
Check pin
4.
If no signal, check
at VFO output on rear panel.
2. L728, C777, C778.
1. 0701.
2.
No HFO injection at
G2 0701.
3.
Q702.
1.
Q704.
2. L725, L726, L727, L729.
3.
Q702.
1.
'2705.
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