Heathkit SB-104 - Carrier Genixtal Filter Circuit Board

Carrier Gen/Xtal Filter Circuit
Board
TROUBLESHOOTING CHART
SYMFTOM
No output in transmit, receiver
OK.
No output in transmit
CW,
receiver OK.
No
wQwt in SSB transmit,
receiver OK.
Receiver and transmitter not
operable, any mode.
Receiver inoperative,
trano
mitter OK.
No
Jignal in receive CW, OK in
SSB.
No signal in SSB receive.
Transmit OK, receive
CW OK.
POSSIBLE
CAUSE
1. 0607.
2. D607, D608, D609, D611.
3. Carrier Null control R665.
4. T601.
5. 0604,0608.
1. D612
not forward biased.
2. CW oscillator not running.
061 1. Y602.
1.
No audio input at pin 24.
2.
Pos~tive voltage at anode of
D612.
1. BFO's not running:
a.
LSB - 0608. Y601.
b. USE - 0613, Y603.
c. CW - Q611, Y602.
2. 0606.
3. SSB filter.
4. L602, L603.
1. 0601. 0603.
1. 0612.
2. CW filter.
3. C676, L677.
4.
D683 and D685 not foward
biased in CW.
5.
D686 and D684 not reverse
biased in
CW.
1.
D678 and D681 not forward
biased in
SSB.
2. D679 and D682 not reverse ,
biased in SSB.