Trouble Shooting Chart; No Raster, Crt Relative Circuit Problems - Fujitsu MCM1514V Service Manual

6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS

1.ABNORMAL POWER SUPPLY
90V,12V
CHECK MAIN PC BOARD
NG
OK
CHECK THE HIGE VOLTAGE
OF CRT ABOUT 23.5 ~ 25.5KV
NG
OK
CHECK THE VOLTAGE OF CRT
HEATER ABOUT 6.3V
NG
OK
CHECK SCREEN VOLTAGE
ABOUT 400V TO 600V
RELATIVE CKT.
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 8-2
"ABNORMAL DISPLAY"