Heathkit SB-104 - Transmitter Audioireg C~Rcuit Board; Circuit Board

Transmitter Audio/Reg
Circuit Board
TROUBLESHOOTING CHART
SYMPTOM
5V missing or low.
11V missing or low.
No TX audio, no VOX, no
sidetone.
No TX audio, VOX
OK.
No VOX, TX audio OK,
PTT OK.
PTT inoperative.
Relay inoperative.
No side tone, no tune mode,
VOX OK.
POSSIBLE CAUSE
1.
13.8V missing.
2.
IC202, D206.
3. Q1 (5V rource).
4. 5V line shorted.
1.
13.8V missing.
2.
IC203, D207.
3. Q2 (1 1V source).
4. 11 V line shorted.
IC201.
1. IC201.
2. Q201.
3. Level control (Mic).
1. IC201.
2. VOX button not depressed.
3. Depress VOX button.
4. 0203. Q204, ZD201.
1. 0205. Q206.Q207,0208.
2. ZD202.
-
1. Relay mil.
2. 0207.
3. D204.
4. ACC plug jumper.
5. Switch
S3E.
1. IC201.
2. 0209. Q210.
&