No Blanking; Hor./Osc/Def/Hv Circuit Fault - HP D8911A Service Manual

CHECK THE RELATIVE
CIRCUIT OF BLANKING
NG
OK
CHECK IC801 PIN 16 ON VIDEO PCB,
CHECK G1 RELATIVE CIRCUIT
Q705, R718, C707 ON MAIN PCB
1. NO RASTER (DISCONNECT WITH SIGNAL CABLE)
CHECK IC401 PIN 10 ABOUT 11.5 VDC
OK
CHECK IC401 PIN 8 WAVE FORM
ABOUT 10Vpp
OK
CHECK THE COLLECTOR VOLTAGE
OF Q402 ABOUT 40Vpp
OK
CHECK THE COLLECTOR VOLTAGE
OF Q403 ABOUT 1100Vpp AT FH:31KHz

6-3 NO BLANKING

6-4 HOR./OSC/DEF/HV CIRCUIT FAULT

NG
NG
NG
NG
CHECK THE RELATIVE CIRCUIT
OF C433, D410, R635, R636, IC105
ON MAIN PCB
CHECK IC401 PIN 10 RELATIVE CIRCUIT
CHECK IC401 PIN 26 ~ 31
RELATIVE CIRCUIT
CHECK Q402, T401
RELATIVE CIRCUIT
CHECK T401, T402, Q402, Q403,
D408, C418, C419, H-DY