Oki MC770 series Maintenance Manual - page 159

45376001TH  Rev.1 

158 /

Oki  Data  CONFIDENTIAL

7. Troubleshooting and repair procedure

Error code

Cause

Error details

Remedial measure

E20A

Occur jam and Paper on the 

Feed Path

Take out the 

jammed paper.

Change the sensor 

Lever.

C h a n g e   t h e   P U 

board.

E400

Face Up Cover Jam 

Change the sensor 

Lever.

Change the cable.

Change the relay 

board or PU board.

E52A

Occur Duplex jam and Paper on 

the Transport Path

Take out the 

jammed paper.

Change the sensor 

Lever.

Change the Duplex 

board.

E57A

Occur Duplex jam and Paper on 

the  Entry Path

Take out the 

jammed paper.

Change the sensor 

Lever.

Change the Duplex 

board.

E58A

Occur Duplex jam and Paper on 

the  Reversal Path

Take out the 

jammed paper.

Change the sensor 

Lever.

Change the Duplex 

board.

C921

AC voltage zero-crossing error

C h e c k   t h e   A C 

voltage.

Change the Low-

voltage board or 

PU board.

F034

Tray4 version error

Change the Tray4 

board

F070

F071

F072

PU Flash Error

Change the PU 

board

F073

Note!

 ・Service calls C41E error, C41B error, C41D error, C37C error and C37D 

　error; These errors can occur when the printer temperature is below 0  . 

　Turn on the power again after the printer temperature has increased.

　　　・Service call C9A0 error can release temporary, by restart the MFP with 

               stapler cover open.