44952001TH Rev.2
7-50
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING PROCEDURES
(1) LCD Display Trouble ................................................................................... 7-51
(1-1) LCD displays nothing ........................................................................ 7-51
(1-2) Display of OKI logo ...........................................................................7-52
(1-3) Error message display ......................................................................7-52
(2) Abnormal MFP operation after powered on .................................................7-52
(2-1) No operation ......................................................................................7-52
(2-2) Abnormal sound ................................................................................7-53
(2-3) Abnormal odor ...................................................................................7-54
(2-4) Slow starting time ..............................................................................7-54
(3) Paper feed jam (error code 391: 1st tray)
....................................................7-64
(3-1) Jam occurs immediately after the power is turned on. (1st tray) .......7-64
(3-2) Jam occurs immediately after the paper feed is started. (1st tray) ....7-64
(4) Feed jam (error code 380)
...........................................................................7-65
(4-1) Jam occurs immediately after the power is turned on. ......................7-65
(4-2) Jam occurs immediately after the paper feed is started. ...................7-66
(5) Paper feed jam (error code 390: Multipurpose tray)
....................................7-67
(5-1) Jam occurs immediately after the power is turned on.
(Multipurpose tray) .............................................................................7-67
(5-2) Jam occurs immediately after paper feed is started.
(Multipurpose tray) .............................................................................7-67
(6) Paper running jam (error code 381:)
...........................................................7-68
(6-1) Jam occurs immediately after the power is turned on. ......................7-68
(6-2) Jam occurs immediately after a paper is taken into printer. ...............7-69
(6-3) Jam occurs in the middle of paper running path. ...............................7-70
(6-4) Jam occurs immediately after paper has reached the fuser. .............7-70
(7) Paper unloading jam (error code 382)
.........................................................7-71
(7-1) Paper unloading jam occurs immediately after the power is turned on.
7-71
(7-2) Paper unloading jam occurs after a paper is taken into printer.
.........7-71
(7-3) Paper unloading jam occurs in the middle of paper running path.
....7-72
(8) Two-sided printing jam (error code: 370, 371, 372, 373, 383)
.....................7-72
(8-1) Two-sided printing jam occurs immediately after the power is
turned on. ..........................................................................................7-72
(8-2) Two-sided printing jam occurs during taking in the paper into
Duplex unit. ........................................................................................7-72
(8-3) Two-sided printing jam occurs in the process of reversing paper.
.....7-73
(8-4) Two-sided printing jam occurs during transporting paper inside
the Duplex unit. ..................................................................................7-73
(8-5) Paper is not supplied from the Duplex unit to the regist roller. ...........7-73
(9) Paper size error (error code 400)
................................................................7-73
(9-1) Jam occurs when paper end is located near the IN1 sensor. ............7-73
(10) ID unit Up/Down error (Service call 142) .....................................................7-74
(10-1) Error occurs during the Up movement of the ID unit .........................7-74
(10-2) Error occurs during the Down movement of the ID unit .....................7-74
(11) Fuser unit error (error 170 to 177) ...............................................................7-75
(11-1) Error occurs immediately after the power is turned on. .....................7-75
(11-2) Error occurs approx. 1 minute after the power is turned on. ..............7-75
(12) Motor fan error (error code 122, 128) .........................................................7-76
(12-1) The low voltage power supply fan does not rotate immediately after
the power is turned on. ......................................................................7-76
(12-2) All fans of the printer do not rotate. ....................................................7-76
(13) Print speed is slow. (Performance is low.) ...................................................7-76
(13-1) Print speed decreases. ......................................................................7-76
(14) Option unit cannot be recognized.
...............................................................7-76
(14-1) Option tray unit cannot be recognized.
..............................................7-76
(15) LED head cannot be recognized. (error code 131, 132, 133, 134)
..............7-77
(15-1) Service call 131 to 134 (LED HEAD Missing) ...................................7-77
(16) Toner cartridge cannot be recognized. (error code 540, 541, 542, 543)
.....7-77
(16-1) Error caused by the consumable items. .............................................7-77
(16-2) Error caused by the toner sensor ......................................................7-77
(16-3) Error caused by the defective mechanism .........................................7-78
(17) Fuse cut error (error codes 153 to 155) .......................................................7-78
(17-1) Fuse cut error ....................................................................................7-78
(18) Humidity sensor error (error code 123) .......................................................7-79
(18-1) Humidity sensor error ........................................................................7-79
Note! • When replacing the CU/PU board, please read the content on the
EEPROM chip of the old board and copy it to the new board. (Refer to 5.6.1
when exchange the CU/PU board)
• Connection diagram is see Fig1-1.
7.5.5 Preparing for troubleshooting
