41316401TH Rev.9
102 /
Oki Data CONFIDENTIAL
2
-1 Paper Loading Jam (1st Tray)
•
Has the paper loading jam occurred immediately after power-on?
•
Yes Is the paper jammed at the entrance cassette sensor or the entrance MT sensor?
•
Yes
Remove the jammed paper.
▼
•
No
Does the sensor lever (entrance cassette sensor, entrance MT sensor) move properly?
•
No
Replace the defective sensor lever.
▼
•
Yes Does the sensor (entrance cassette sensor, entrance MT sensor) operate properly?
(Operate each sensor lever to check signals on the FSENS connector pin of the engine
board (71K PWB).)
Pin 4: Entrance cassette sensor, Pin 2: Entrance MT sensor
•
No
Replace the sensor board (R71 PWB) after checking the signal cable connection.
▼
•
Yes Check the signal cable connection or replace the engine board.
▼
•
No
Has the paper loading jam occurred immediately after the paper drawing into the tray?
•
Yes Has the paper reached the entrance cassette sensor or the entrance MT sensor?
•
Yes Go to .
▼
•
No
Replace the feed roller or the paper separation frame Assy of the paper cassette.
▼
•
No
Is the main feed motor running?
Yes Replace the feed roller or the paper separation frame Assy of the paper cassette.
▼
•
No
Does the resistance of the main motor lie at the rated value (approx. 4
Ω
)?
No
Replace the main feed motor.
▼
•
Yes
Is 32V output to the fuses FU2 and FU3 of the engine board?
No
Replace the low voltage power unit.
▼
•
Yes
Replace the engine board after checking the gear engagement and cable connection.
A
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...
