Transmitter
IF
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 73 of this Manual.
w
SYMPTOM
No output on any band.
No output on one band.
ALC inoperative (power
output too low or high,
no ALC meter indication).
Refer to the "X-Ray View" and "Voltage Chart" (fold-out
from this page).
POSSIBLE CAUSE
1.
0301, 0304. 0305, IC301.
2.
11V missing.
3. Premix missing.
4.
No IF input (from card
E).
1. Premix missing.
2. Defective component in
bandpass filter or
bandswitch.
3. 3.395
MHz
trap misadjusted
(80 meters).
4.
L309, L310, L31Q. L320
require alignment
(10
meters).
1. 0302,
Q303.
2. IC301.
3.
FilterIALC (card
K).
4.
ALC line shorted to chassis.
5.
Insufficient drive to
develop ALC.
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