Zenith CM-150 Series Service Manual page 26

POW ER UP CHECKS - DEAD SET
Check Standby Conditions
Power Supply
(F5)
150VDC - CR3402 C
15VSB - L3416 (E6)
37VSB - CR3488 cath (E6)
PW RFA - R3442 (E5)
YES
Check Standby Conditions
Main Module
5VSB - R4108 (C2)
YES
Power ON Conditions
Main Module
5VSW - W 9
YES
Power ON Conditions
Power Supply
3.8VDC - R3432
YES
Power ON Conditions
Power Supply
115VDC - RX3437 left end
CM150/PV150
TROUBLESHOOTING
GM A Line Projection TV
Check AC Power
Then Replace
NO Power Supply
Check 6A3 Cable
Then Replace
Main Module (E5)
NO
Replace
Main Module
NO
(C2)
Check 6A3 Cable
Then Replace (E5)
(E6) Power Supply
NO
Replace
Power Supply
(E4)
NO
SW EEP/HV CHECKS - DEAD SET
Sweep ON Conditions
Power Supply
H DRV - R3264 (G2) NO
4V p-p / 1V AC
# = H DRV can also be checked
YES
on top of the 9-1642/1645
2N3 pin 2
Sweep ON Conditions
(G4)
Power Supply
250VDC - RX3206 YES
NO
HV ON Conditions
Power Supply
(G4)
Unplug 4F YES
250VDC - RX3206
NO
HV ON Conditions
Power Supply (E3)
NO
47 - 52K ohm - 4F
YES
Replace
Power Supply
Also Check CRTs
3-4
Check 2N3 Cable
Then Replace (G2)
Main Module
Check System
For Video
Shut Down
Replace
Focus Block
Replace
(G4)
Focus Block
250VDC - RX3206
NO
Replace
Power Supply
Also Check CRTs
GM CHASSIS