Panasonic UF-5500 Service Manual page 199

11.2.21.2. Troubleshooting Flow Chart
Is F1 open?
Is F2 open?
Is D104 short?
Is D503 short?
Is F101 open?
Power ON
24V output OK?
Power OFF
Replace the whole board.
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Check the Fuser Unit.
Replace F1.
Yes
Is D1 short?
No
Yes
Is C5 short?
No
Yes
Is Q1(D-S, D-G
or S-G) short?
No
Replace F2.
7pin-5pin of
Yes
CN101 is short?
No
Replace F101.
Yes
7V output OK?
No
199
Replace D1.
Replace C5.
Replace Q1.
Replace D104.
Replace D503.
Check the Main Board.
OK
END
UF-5500 / 4500