41316401TH Rev.9
109 /
Oki Data CONFIDENTIAL
5
Fusing Unit Error
•
Has the fuser error occurred immediately after power-on?
•
Yes Is the heat roller thermistor broken or short-circuited? (See Figure 5-1.)
(approx. 190k to 980k
Ω
at room temperatures of 0 to 43˚C)
•
Yes Replace the fuser unit.
▼
•
No
Is the backup roller thermistor broken or short-circuited? (See Figure 5-1.)
(Approx. 190k to 980k
Ω
at room temperatures of 0 to 43˚C)
•
Yes Replace the fuser unit.
▼
•
No
▼
•
No
Has the fuser unit error occurred three minutes after power-on?
•
No
Go to .
▼
•
Is the heater of the fuser unit on (Is it hot)?
•
Yes Replace the engine board.
▼
•
No
Replace the fuser unit.
▼
•
No
Is AC voltage output between the CN1 connector pin1 and pin3 of the low voltage power unit.
No
Replace the low voltage power unit.
▼
•
Yes
Replace the fuser unit.
Figure 5-1
▼
A
Backup roller thermistor
Heat roller thermistor
A
Summary of Contents for C7400
Page 14: ...41316401TH Rev 9 14 Oki Data CONFIDENTIAL 2 2 Parts layout Figure 2 1 A B A B B A A B...
Page 15: ...41316401TH Rev 9 15 Oki Data CONFIDENTIAL Top Cover Assy Figure 2 2...
Page 16: ...41316401TH Rev 9 16 Oki Data CONFIDENTIAL Printer Unit 1 2 Figure 2 3 A A...
Page 17: ...41316401TH Rev 9 17 Oki Data CONFIDENTIAL Printer Unit 2 2 Figure 2 4 45...
Page 18: ...41316401TH Rev 9 18 Oki Data CONFIDENTIAL Cassette Guide Assy L R Figure 2 5 A B B A C C C C...
Page 19: ...41316401TH Rev 9 19 Oki Data CONFIDENTIAL Duplex Unit A B D C A B C D E E F G G F Figure 2 6...
