Trouble Shooting Chart; Raster, Crt Relative Circuit Problems - Tatung VM5ERDA Service Manual

6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS
88V, 12V
CHECK MAIN PC BOARD
NG
OK
CHECK THE HIGE VOLTAGE
OF CRT ABOUT 23.5KV ~ 25KV
NG
OK
CHECK THE VOLTAGE OF CRT
HEATER ABOUT 6.3V
NG
OK
CHECK SCREEN VOLTAGE ABOUT
400V TO 600V
LESS THAN 300V
OK
BRIGHTNESS SET TO MAX.
THEN CHECK CRT G1 VOLTAGE
NG
OK
CHECK VOLTAGE OF THE CRT
CATHODE ABOUT 60V TO 70V
NG

6.TROUBLE SHOOTING CHART

CHECK POWER SAVING CIRCUIT,
Q909, Q910
CHECK FAILSAFE CKT Q402, Q403
RELATIVE CKT.
CHECK CRT'S HEATER
RELATIVE CIRCUIT Q907, Q908
CHECK FBT. D706, R723, C713
CHECK BRIGHTNESS CIRCUIT
Q703, Q704, Q705 RELATIVE CKT.
REFER ITEM 6-2
"ABNORMAL DISPLAY"