45530603TH Rev.2
4-36
Oki Data CONFIDENTIAL
4. TROUBLESHOOTING PROCEDURE
Note! When replacing the PU/CU PCB, load the EEPROM chip contents of the
old board first, and copy them to the new board upon completion of the
replacement. (Refer to section 5.4.1 Notes on PU/CU board replacement.)
(1) LCD display error ...........................................................................................4-37
(1-1) LCD does not display anything. ........................................................4-37
(1-2) Error message related to the control panel ......................................4-38
(1-3) “RAM checking” or “Initializing” remains displayed. .........................4-38
(2) Abnormal operations of the printer after the power is turned on ....................4-38
(2-1) Any operation does not start at all. ...................................................4-38
(2-2) Abnormal sound is heard. ................................................................4-39
(2-3) Bad odors are generated. .................................................................4-40
(2-4) Rise-up time is slow. .........................................................................4-40
(3) Jam. ...............................................................................................................4-40
(3-1) Error code numbers and locations of paper jams .............................4-40
(4) Paper feed jam (Error 391: 1st Tray) ..............................................................4-62
(4-1) Jam occurs immediately after the power is turned on. (1st tray). .....4-62
(4-2) Jam occurs immediately after the paper feed is started. (1st tray) ...4-63
(5) Feed jam (Error 380) ......................................................................................4-64
(5-1) Jam occurs immediately after the power is turned on. .....................4-64
(5-2) Jam occurs immediately after the paper feed is started. ..................4-64
(6) Paper feed jam (Error 390: MP Tray) ..............................................................4-65
(6-1) Jam occurs immediately after paper feed is started. (Multipurpose tray) ......4-65
(7) Paper running jam (Error 381) .......................................................................4-66
(7-1) Jam occurs immediately after the power is turned on. .....................4-66
(7-2) Jam occurs immediately after a paper is taken into printer. .............4-67
(7-3) Jam occurs in the middle of paper running path. .............................4-68
(7-4) Jam occurs immediately after paper has reached the fuser. ...........4-68
(8) Paper unloading jam (Error 382) ...................................................................4-69
(8-1) Paper unloading jam occurs immediately after the power is turned on. .4-69
(8-2) Paper unloading jam occurs after a paper is taken into printer. ........4-69
(8-3) Paper unloading jam occurs in the middle of paper running path. ...4-70
(9) Duplex printing jam (Errors 370, 371, 372, 373 and 383) ..............................4-70
(9-1) Duplex printing jam occurs immediately after the power is turned on. .........4-70
(9-2) Duplex printing jam occurs during taking in the paper into Duplex unit. ........4-70
(9-3) Duplex printing jam occurs during transporting paper inside the Duplex unit. ......4-71
(9-4) Paper is not supplied from the Duplex unit to the timing roller. ....................4-71
(10) Paper size error (Errors 400 and 401) ...........................................................4-71
(10-1) Jam occurs when paper end is located near the IN1 sensor. ...........4-71
(11) ID unit Up/Down error
(Service calls 143-01: K, -02: C, -03: M, -04: Y, -05: W/CL) ............................4-72
(11-1) Error occurs during the Up movement of the ID unit ........................4-72
(12) Fuser unit error (Errors 167 to 173) ...............................................................4-72
(12-1) Error occurs immediately after the power is turned on. ....................4-72
(12-2) Error occurs approx. 1 minute after the power is turned on ..............4-73
(13) Motor fan error (Service calls 128-01 to 128-10 and 051) .............................4-73
(13-1) The low voltage power supply fan does not rotate immediately
after the power is turned on. ............................................................4-73
(14) Print speed is slow. (Performance is low.) ......................................................4-74
(14-1) Print speed decreases......................................................................4-74
(15) Duplex unit cannot be recognized. .................................................................4-74
(15-1) Duplex unit cannot be recognized. ...................................................4-74
(16) Option tray unit cannot be recognized.. ..........................................................4-75
(16-1) Option tray unit cannot be recognized. .............................................4-75
(17) LED head cannot be recognized. (Service Calls 134-01 to 134-05) ..............4-75
(17-1) Errors 131 to 134 (LED HEAD Missing) ...........................................4-75
(18) Toner sensor error (Errors 5400 to 5405) ......................................................4-76
(18-1) Error caused by the consumable items. ..........................................4-76
(18-2) Error caused by the defective mechanism ......................................4-77
(19) Humidity sensor error (Service call 123) ........................................................4-77
(19-1) Humidity sensor error ......................................................................4-77
(20) Wiring diagram ...............................................................................................4-79
4.5.2 Preparation for troubleshooting
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