CONFIDENTIAL
5 Troubleshooting
5-2
CF21G*
5-1-2 PFC Failure
Check the Voltage at IC701 Pin5.
The Voltage is around 10V
DC
?
Check and Replace D702,
R711, ZD705, ZD706.
Yes
No
Q701 Gate waveform is right?
Replace IC701.
Yes
No
Check the Voltage at D701 cathode.
The Voltage is about 400V
DC
?
Replace Q701, D701.
Yes
No
Done.
5-1-3 DPMS Failure
Check signal source
H/V sync. video signal.
Make No H/V sync.
( That is power off mode).
LED blinks?
Does +12V Line off?
(Check the IC651 output Pin 2)
Check IC201 Pin 25
or replace IC201.
Yes
No
Does +14V_V Line off?
(Check the Q670 Collector)
Check Q671, D670.
Yes
No
Does the Q620 activate?
Check IC201 Pin 22
or replace IC201.
Yes
No
Done.
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 ...