CONFIDENTIAL
5 Troubleshooting
CF21G*
5-9
5-1-17 No Video
IC101 Pins 1, 3 and 5
inputs are right?
IC101 Pins 20, 22 and 24
outputs are right?
Check Vcc on IC101
and replace IC101.
Yes
Yes
No
Check CN101, IC1, QR51, QG51,
QB51, and IC3 on BNC Board.
No
IC102 Pins 25, 28 and 30
outputs are right?
Check +12 V line.
Check and replace IC102.
Yes
No
Are there waveforms at CRT
Socket Pin Red, Green, Blue?
Check +80 V line.
Check and replace IC105 and
components around IC105.
Yes
No
G2 voltage is right?
Heater Voltage is right?
Check D598, D599 and G2 wire.
Check CN102 wire Assy.
Change CRT.
Yes
Done.
No
Check signal cable and connection.
15
WAVEFORMS
15
CRT Socket, Red, Green, Blue
Summary of Contents for CF21G Series
Page 32: ...CONFIDENTIAL CF21G 6 1 6 Exploded View and Parts List ...
Page 33: ...Memo 6 Exploded View Parts List 6 2 CF21G CONFIDENTIAL ...
Page 61: ...CONFIDENTIAL Memo 8 Block Diagrams 8 2 CF21G ...
Page 63: ...Memo 9 Wiring Diagram 9 2 CF21G CONFIDENTIAL ...
Page 65: ...CONFIDENTIAL 10 Schematic Diagrams 10 2 CF21G 1 368 V IC601 1 ...