12
2. No Raster
No
No
Refer to trouble in
power supply unit.
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Refer to trouble
in P.S.U
Is
Heater Voltage
(CRT PWB)
about
6V?
Is
CRT heater
red-hot?
Is
whole screen
bright?
Check
G1 voltage about
-70V?
Is CRT
G2 (screen) voltage
about 560V?
Is
65Vdc line
normal?
Yes
Does
increasing of the
Brightness control level
make screen
bright?
No
No
No Raster
Increase the Brightness
& Contrast control level
fully Maxium
Trouble in
power supply
circuit
Trouble in
video
circuit
Trouble in
CRT
Trouble in G1
line of Main
PWB
Trouble in FBT
Trouble in 65Vdc
line of power
supply unit
No High Voltage
trouble in FBT
Raster OK
Summary of Contents for CMC-518X
Page 30: ...28 BLOCK DIAGRAM...
Page 31: ...PCB LAYOUT 29 Main PCB Solder Side...
Page 32: ...30 Video PCB Solder Side...
Page 33: ...31 Main PCB Component Side...
Page 34: ...32 Video PCB Component Side...
Page 35: ...SCHEMATIC DIAGRAM 33...
Page 36: ...34...
Page 37: ...EXPLODED VIEW DIAGRAM 35...
