OKI C7550 Error Codes list and solutions

OKI C7550 Error Codes list and solutions

– Compatible Printer model: OKI C7550
– OKI C7550 Error Code description:

• Code: –
• Display: Replace fuser
• Description: Fuser counter exceeded life.
• Troubleshooting Guides: 1) Is error message displayed? 2) Was fuser unit just replaced?
  Check fuser unit life. Replace fuser immediately or at next maintenance.

• Code: –
• Display: Paper in * tray nearly empty
• Description: Paper near end detected.
• Troubleshooting Guides: Are only few papers remaining in tray? (approx. 30 sheets or less)
  Refill paper. Check paper near end sensor.

• Code: –
• Display: Disk operation error
• Description: Cannot write in HDD.
• Troubleshooting Guides: Is faulty operation being applied? Check manual operation. HDD abnormality. Replace HDD.

• Code: 001 … 011
• Display: Service Call 001: Error ~ 011: Error
• Description: CPU Exception
• Troubleshooting Guides: Does error display reappear? Turn power OFF and ON. Replace CU board. (Replace EEPROM)

• Code: 020
• Display: Service Call 020: Error
• Description: CU ROM Hash Check Error 1
• Troubleshooting Guides: Is program ROM DIMM set properly? Is error recovered by replacing program ROM DIMM?
  Reset program ROM DIMM. Replace program ROM DIMM. Replace CU board. (Replace EEPROM)

• Code: 030
• Display: Service Call 030: Error
• Description: CU Slot1 DIMM RAM Check Error
• Troubleshooting Guides: Is subject RAM DIMM set properly? Is error recovered by replacing subject ROM DIMM?
  Reset subject RAM DIMM. Replace RAM DIMM. Replace CU board. (Replace EEPROM)

• Code: 031
• Display: Service Call 031: Error
• Description: CU Slot2 DIMM RAM Check Error
• Troubleshooting Guides: Is subject RAM DIMM set properly? Is error recovered by replacing subject ROM DIMM?
  Reset subject RAM DIMM. Replace RAM DIMM. Replace CU board. (Replace EEPROM)

• Code: 032
• Display: Service Call 032: Error
• Description: CU Slot3 DIMM RAM Check Error
• Troubleshooting Guides: Is subject RAM DIMM set properly? Is error recovered by replacing subject ROM DIMM?
  Reset subject RAM DIMM. Replace RAM DIMM. Replace CU board. (Replace EEPROM)

• Code: 035
• Display: Service Call 035: Error
• Description: Slot1 RAM Spec Error. The CU RAM Slot1 DIMM specification is not supported.
• Troubleshooting Guides: Is RAM DIMM genuine? Is subject RAM DIMM gap setting proper? Is error recovered by replacing subject ROM DIMM?
  Use genuine RAM DIMM. Reset subject RAM DIMM. Replace RAM DIMM. Replace CU board. (Replace EEPROM)

• Code: 036
• Display: Service Call 036: Error
• Description: Slot2 RAM Spec Error. The CU RAM Slot2 DIMM specification is not supported.
• Troubleshooting Guides: Is RAM DIMM genuine? Is subject RAM DIMM gap setting proper? Is error recovered by replacing subject ROM DIMM?
  Use genuine RAM DIMM. Reset subject RAM DIMM. Replace RAM DIMM. Replace CU board. (Replace EEPROM)

• Code: 037
• Display: Service Call 037: Error
• Description: Slot3 RAM Spec Error. The CU RAM Slot3 DIMM specification is notsupported.
• Troubleshooting Guides: Is RAM DIMM genuine? Is subject RAM DIMM gap setting proper? Is error recovered by replacing subject ROM DIMM?
  Use genuine RAM DIMM. Reset subject RAM DIMM. Replace RAM DIMM. Replace CU board. (Replace EEPROM)

• Code: 040
• Display: Service Call 040: Error
• Description: CU EEPROM Error
• Troubleshooting Guides: Is error recovered by replacing EEPROM on CU board?
  Replace EEPROM. (Recover user environment.) Replace CU board. (Replace EEPROM)

Solve OKI C7550 Error codes

• Code: 041
• Display: Service Call 041: Error
• Description: CU Flash Error Flash ROM error on CU board.
• Troubleshooting Guides: Does error display reappear? Replace CU board. (Replace EEPROM.)

• Code: 042 … 044
• Display: Service Call 042: Error ~ 044: Error
• Description: Flash File SYSTEM Error
• Troubleshooting Guides: Failed access to Flash set directly on CU board.
  Press 0, 3, 5, 6 to turn power ON, release buttons when [FLASH FORMAT] appears, wait until [ON-LINE] (2sec) and replace CU board if symptom does not change.

• Code: 048
• Display: Service Call 048: Error
• Description: CU ROM for PS+PCL was set in Non-PS device.
• Troubleshooting Guides: Is proper program ROM set? Replace program ROM DIMM. Replace with proper program ROM DIMM.

• Code: 049
• Display: Service Call 049: Error
• Description: CU type mismatch CU ROM does not match with the device.
• Troubleshooting Guides: Is proper program ROM set? Replace program ROM DIMM. Replace with proper program ROM DIMM.

• Code: 050
• Display: Service Call 050: Error
• Description: Operator Panel Error
• Troubleshooting Guides: Does error display reappear? Refer to no LCD display flow chart.

• Code: 051
• Display: Service Call 051: Error
• Description: CU Fan Error Abnormal CPU cooling fan on CU board.
• Troubleshooting Guides: Is connector set properly on CU board? Is error recovered by replacing fan?
  Connect properly. Replace fan. Replace CU board. (Replace EEPROM.)

• Code: 063
• Display: Service Call 063: Error
• Description: Network comm. Error Abnormal H/W I/F between CU-NIC
• Troubleshooting Guides: Is network board set properly? Is error recovered by replacing network board?
  Set properly. Replace Network. Replace CU board. (Replace EEPROM.)

• Code: 065
• Display: Service Call 065: Error
• Description: NIC Combination Error
• Troubleshooting Guides: Is proper Network board for the model set?
  Replace NIC card. Replace with proper Network board.

• Code: 070
• Display: Service Call 070: Error
• Description: CANT_HAPPEN PS firmware fault detected.
• Troubleshooting Guides: Confirm that error is recovered by turning power OFF/ON. Replace CU board. (Replace EEPROM.)

• Code: 072
• Display: Service Call 072: Error
• Description: Engine communication error I/F error between PU-CU.
• Troubleshooting Guides: Is CU assembly set properly? Is error recovered by replacing CU board?
  Set properly. Replace CU board. (Replace EEPROM.) Replace PU board.

• Code: 073 … 075
• Display: Service Call 073: Error ~ 075: Error
• Description: Video overrun detect
• Troubleshooting Guides: Is CU assembly set properly? Is error recovered by replacing CU board?
  Set properly. Replace CU board. (Replace EEPROM.)

• Code: 102
• Display: Service Call 102: Error
• Description: Error in engine RAM read/write detected at power ON.
• Troubleshooting Guides: Does error reoccur? Replace engine control board.

• Code: 103
• Display: Service Call 103: Error
• Description: Error in engine SRAM read/write detected at power ON.
• Troubleshooting Guides: Does error reoccur? Replace engine control board.

• Code: 104
• Display: Service Call 104: Error
• Description: Error in engine EEPROM check total detected at power ON.
• Troubleshooting Guides: Does error reoccur? Replace engine control board.

• Code: 105
• Display: Service Call 105: Error
• Description: EEPROM not detected at power ON.
• Troubleshooting Guides: Does EEPROM exist? Does error reoccur?
  Check for EEPROM and set if not found. Replace engine control board.

• Code: 106
• Display: Service Call 106: Error
• Description: Error in engine control logic detected at power ON.
• Troubleshooting Guides: Does error reoccur? Replace engine control board.

• Code: 107
• Display: Service Call 107: Error
• Description: Engine ROM check sum error.
• Troubleshooting Guides: Does error reoccur? Is error recovered by reloading PU F/W?
  Reload PU I/F. Replace engine control board.

• Code: 110 … 116
• Display: Service Call 110: Error ~ 116: Error
  110: Envelope Feeder 111: Duplex unit
  112: 2nd Tray 113: 3rd Tray 114: 4th Tray
  115: 5th Tray 116: Finisher
• Description: Option unit for different model detected.
• Troubleshooting Guides: Is a proper option unit for the printer set? Set proper option unit. Check connections and turn power ON. If error is not recovered, replace the unit.

• Code: 120
• Display: Service Call 120: Error
• Description: PU unit fan motor error.
• Troubleshooting Guides: 1) Is fan in PU unit operating? 2) Error reoccurs after replacing fan motor.
  Replace fan motor. Replace engine control board. Replace engine control board.

• Code: 121
• Display: Service Call 121: Error
• Description: High-voltage power supply I/F error.
• Troubleshooting Guides: Is cable between PU board andhighvoltage power LSI connected properly? Connect properly. Replace high-voltage power supply. Check improper connections for high-voltage.

• Code: 122
• Display: Service Call 122: Error
• Description: Low-voltage power supply fan error. Low-voltage power supply temperature error.
• Troubleshooting Guides: 1) Is fan in low-voltage power supply unit operating? 2) Error reoccurs after replacing fan motor.
  Replace fan motor. Replace low-voltage power supply. Replace low-voltage power supply.

• Code: 123
• Display: Service Call 123: Error
• Description: Improper environment humidity detected by sensor.
• Troubleshooting Guides: 1) Is error message displayed? 2) Does error reoccur?
  Turn ON power again. Replace humidity sensor.

• Code: 124
• Display: Service Call 124: Error
• Description: Improper environment temperature detected by sensor.
• Troubleshooting Guides: 1) Is error message displayed? 2) Does error reoccur?
  Turn ON power again. Replace humidity sensor.

• Code: 125
• Display: Service Call 125: Error
• Description: Error detected at MT home position.
• Troubleshooting Guides: 1) Is error message displayed? 2) Does error reoccur?
  Turn ON power again. Replace MT.

• Code: 126
• Display: Turn power OFF and wait 126: Dew error
• Description: Sensor dew error.
• Troubleshooting Guides: Sensor dew error detected. Turn ON power after a while.

• Code: 130
• Display: Service Call 130: Error
• Description: Temperature rise detected at LED head.
• Troubleshooting Guides: 1) Is error message displayed? 2) Does error reoccur?
  Leave alone for 30 min. Turn power OFF. Leave for 30 min., then turn power ON. Replace LED head.

• Code: 131, 132, 133, 134
• Display: Service Call 131: Y Head 132: M Head
  133: C Head 134: K Head
• Description: Same unit not detected upon power ON or opening cover.
• Troubleshooting Guides: 1) Is error message displayed? 2) Is LED head properly set? 3) Does error reoccur?
  Confirm that LED head is set properly. Turn power ON again. Replace LED head assembly.

• Code: 140, 141, 142, 143
• Display: Service Call 140: Y ID 141: M ID
  142: C ID 143: K ID
• Description: Error detected at proper ID position.
• Troubleshooting Guides: 1) Is error message displayed? 2) Does error reoccur?
  Turn power ON again. Replace drum assembly.

• Code: 150, 151, 152, 153
• Display: Service Call 150: Y 151: M 152: C 153: K
• Description: When a fuse could not be disconnected in the ID unit.
• Troubleshooting Guides: Is ID unit set properly? Check cable connections and replace engine board.

• Code: 154
• Display: Service Call 154: Error
• Description: When belt unit fuse cannot be disconnected.
• Troubleshooting Guides: Is belt unit set properly? Check cable connections and replace engine board.

• Code: 155
• Display: Service Call 155: Error
• Description: When fuser unit fuse cannot be disconnected.
• Troubleshooting Guides: Is fuser unit set properly? Check cable connections and replace engine board.

• Code: 160, 161, 162, 163
• Display: Service Call 160: Y Toner 161: M Toner
  162: C Toner 163: K Toner
• Description: Error detected by toner sensor.
• Troubleshooting Guides: 1) Is error message displayed? 2) Does error reoccur?
  Replace toner sensor or assembly (Y71-PWB). Same as above.

• Code: 170, 171, 174, 175
• Display: Service Call 170: Error 171: Error
  174: Error 175: Error
• Description: Short circuit in fuser thermistor or open detected (high temp. or low temp.)
• Troubleshooting Guides: 1) Is error message displayed? 2) Does error reoccur?
  Turn ON power again. Replace thermistor and turn power OFF. Leave aside for 30 min.

• Code: 172, 176
• Display: Service Call 172: Error 176: Error
• Description: Thermistor indicates high-temperature error.
• Troubleshooting Guides: 1) Is error message displayed? 2) Does error reoccur?
  Turn ON power again. Replace thermistor and turn power OFF. Leave aside for 30 min.

• Code: 173, 177
• Display: Service Call 173: Error 177: Error
• Description: Thermistor indicates low-temperature error.
• Troubleshooting Guides: 1) Is error message displayed? 2) Does error reoccur?
  Turn ON power again. Replace thermistor and turn power OFF. Leave aside for 30 min.

• Code: 179
• Display: Service Call 179: Error
• Description: Wrong fuser standard
• Troubleshooting Guides: 1) Does fuser match with model and power voltage? 2) Error reoccurs after setting fuser properly
  Set proper fuser. Check if fuser is set properly. Replace fuser.

• Code: 180 … 186
• Display: Service Call 180: Error ~ 186: Error
• Description: Communication disability with option unit detected by engine.
• Troubleshooting Guides: 1) Is error message displayed? 2) Does error reoccur?
  Turn ON power again. Replace option unit.

• Code: 187
• Display: Service Call 187: Error
• Description: Communication with control panel disabled.
• Troubleshooting Guides: Is cable properly connected to control panel? Connect properly. Replace control panel and cable.

• Code: 310
• Display: Close cover 310: Top cover open
• Description: Printer engine cover open.
• Troubleshooting Guides: 1) Check if top cover is open. 2) Check if cover switch is proper.
  Close top cover. Close side cover. Replace cover switch.

• Code: 320
• Display: Reset fuser 320: Fuser error
• Description: Same unit not detected upon power ON or opening cover.
• Troubleshooting Guides: 1) Is error message displayed? 2) Is fuser unit set properly? 3) Does error reoccur?
  Check if fuser is set properly. Reset fuser and turn ON power again. Replace fuser unit assembly.

• Code: 321
• Display: Turn power OFF and wait 321: MOTOR OVERHEAT
• Description: Printer cannot be used temporarily due to motor overheat.
• Troubleshooting Guides: Turn ON power after a while.

• Code: 323
• Display: Open/close cover 323: Paper thickness error
• Description: Sensor output out of range with no media. (Only for Factory Mode)
• Troubleshooting Guides: 1) Are foreign objects mixed in sensor? 2) Does printer recover when detecting paper thickness by opening/closing tray? 3) Does printer recover by power OFF/ON.
  Remove foreign objects. Normal.

• Code: 324
• Display: Open/close cover 324: Paper thickness error
• Description: Sensor output gap out of range with no media. (Only for Factory Mode)
• Troubleshooting Guides: 1) Are foreign objects mixed in sensor? 2) Does printer recover when detecting paper thickness by opening/closing tray? 3) Does printer recover by power OFF/ON.
  Remove foreign objects. Normal.

• Code: 325
• Display: Open/close cover 325: Paper thickness error
• Description: Media detect value out of range.
• Troubleshooting Guides: 1) Is different media type mixed in? 2) Is media being double fed?
  Remove foreign objects.

• Code: 326
• Display: Open/close cover 326: Paper thickness error
• Description: U-Heavy mode media detect value out of range.
• Troubleshooting Guides: Is different media type mixed in? Remove foreign objects.

• Code: 330
• Display: Reset belt 330: Belt error
• Description: Same unit not detected upon power ON or closing cover.
• Troubleshooting Guides: 1) Is error message displayed? 2) Is belt unit set properly? 3) Does error reoccur?
  Check set condition of belt unit. Reset belt unit and turn power ON again. Replace belt unit assembly.

• Code: 330 … 343
• Display: Reset drum 330~343: Drum error
• Description: Same as above.
• Troubleshooting Guides: 1) Is error message displayed? 2) Is image drum set properly? 3) Does error reoccur?
  Check set condition of ID. Turn power ON again. Replace ID unit assembly.

• Code: 350, 351, 352, 353
• Display: Set new drum 350: Yellow drum life
  351: Magenta drum life
  352: Cyan drum life
  353: Black drum life
• Description: ID unit life.
• Troubleshooting Guides: Right after replacing ID unit? Check ID unit life. Replace ID unit.

• Code: 354
• Display: Set new fuser 354: Fuser life
• Description: Fuser life (occurs when fuser life continuation is OFF).
• Troubleshooting Guides: Right after replacing fuser? Check fuser life. Replace fuser.

• Code: 355
• Display: Set new belt 355: Belt life
• Description: Belt life notified (alarm). Print N-count by opening and closing cover.
• Troubleshooting Guides: Right after replacing belt? Check belt life. Replace belt.

• Code: 356
• Display: Set new belt 356: Belt life
• Description: Waste toner belt life notified (alarm). Print N-count by opening and closing cover. N=20
• Troubleshooting Guides: Right after replacing belt? Check belt life. Replace belt.

• Code: 360
• Display: Set duplex unit 360: Duplex unit is open.
• Description: When duplex unit is removed from printer.
• Troubleshooting Guides: Does error recover by resetting duplex unit? Normal. Replace duplex unit or engine board.

• Code: 370
• Display: Check DUPLEX 370: Paper jam
• Description: Paper jam detected after paper rotated in duplex unit.
• Troubleshooting Guides: Check paper jam in duplex unit. Remove jammed paper. Check/replace duplex unit.

• Code: 371
• Display: Check DUPLEX 371: Paper jam
• Description: Paper jam during paper feed from duplex unit.
• Troubleshooting Guides: Check paper jam in duplex unit. Remove jammed paper. Check/replace duplex unit.

• Code: 372
• Display: Check DUPLEX 372: Paper jam
• Description:
• Troubleshooting Guides: Check miss-feed in duplex unit. Remove miss-fed paper and close cover. Check/replace duplex unit.

• Code: 380
• Display: Open front cover 380: Paper jam
• Description: Paper jam during paper feed from cassette 1, 2, 3, 4 or 5.
• Troubleshooting Guides: Check miss-feed in duplex unit. Remove miss-fed paper and set cassette. Check/replace cassette 1, 2, 3, 4, or 5.

• Code: 381
• Display: Open top cover 381: Paper jam
• Description: Paper jam detected between black ID and fuser
• Troubleshooting Guides: 1) Check paper jam between yellow ID and fuser. 2) Check fuser unit load.
  Remove jammed paper. Replace fuser unit.

• Code: 382
• Display: Open top cover 382: Paper jam
• Description: Paper jam detected in fuser or during paper ejection from fuser.
• Troubleshooting Guides: 1) Check paper jam in fuser and between yellow ID and fuser. 2) Check if paper ejection switch is proper.
  Remove jammed paper. Replace paper ejection switch.

• Code: 383
• Display: Open top cover 383: Paper jam
• Description: Paper jam detected when paper started to enter duplex print unit.
• Troubleshooting Guides: Check paper jam in duplex unit or at entrance. Remove jammed paper. Check/replace duplex unit.

• Code: 389
• Display: Open top cover 389: Paper jam
• Description: Jam generated in paper path.
• Troubleshooting Guides: Open front cover and check jammed paper. Remove jammed paper.

• Code: 390
• Display: Check MP tray 390: Paper jam
• Description: Paper jam during paper feed from MT.
• Troubleshooting Guides: Check for miss-fed paper around MT cassette. Remove miss-fed paper and close cover. Check/replace MT.

• Code: 391 … 395
• Display: Check tray * 391~395: Paper jam
• Description: Paper jam detected between cassette and black ID.
• Troubleshooting Guides: 1) Check jammed paper between cassette and yellow ID. 2) Check if paper entry switch is normal.
  Remove jammed paper. Replace entry switch.

• Code: 400
• Display: Open top cover 400: Paper size error
• Description: Non-set paper (45mm or above) detected by printer engine.
• Troubleshooting Guides: 1) Is paper custom size? 2) Is paper standard size?
  No treatment required. Adjust paper size guide in cassette. Replace paper size board (PXC PWB).

• Code: 410, 411, 412, 413
• Display: Refill toner 410: Yellow 411: Magenta 412: Cyan 413: Black
• Description: Certain toner is almost empty.
• Troubleshooting Guides: 1) Selected toner cartridge is almost empty. 2) Check if selected toner cartridge is normal.
  Replace with new toner kit. Replace selected toner sensor.

• Code: 480
• Display: Remove paper 480: Stacker full
• Description: Paper ejection stacker is full.
• Troubleshooting Guides: 1) Check if stacker is full. 2) Check if stacker full sensor is operating properly.
  Remove paper from stacker. Replace stacker full sensor.

• Code: 490
• Display: Set *** 490: No paper in MP tray (* stands for A4 B4, etc.)
• Description: No paper in selected cassette. cassette is not set, or paper ran out in cassette being used.
• Troubleshooting Guides: 1) Check if paper is empty in MT. 2) Check if paper-end sensor is operating properly.
  Set paper in MT. Replace paper-end sensor.

• Code: 491 … 495
• Display: Set *** 491~495: No paper in * tray (* stands for A4 B4, etc.)
• Description: Paper empty in cassette 1, 2, 3, 4, or 5.
• Troubleshooting Guides: 1) Check if paper is empty in selected cassette. 2) Check if paper-end sensor is operating properly.
  Set paper in selected cassette. Replace the corresponding paper-end sensor.

– Get more information about Epson XP 15000 troubleshooting, click here

– Get more error code list with quick guide to fix printer product, click here
– About get help with reseting Epson inkpad or others, click here

Waste Ink Pad Counter Utility Functions:

– Cleaning printhead.
– Ink charge.
– Fix Epson red lights blinking Error

– Fix Epson Service Required Error: A printer’s ink pad at the end of its service life Please contact Epson Support.

– Check the current value of waste ink counters and ink level counters.
– Clear Waste Ink Counters.
– Read and write serial number.
– Read and write USB ID.
– Read and write HEAD ID.
– Make EEPROM dump, backup.
– Paper feed test.
– Nozzle check.
– Color check pattern.
– Initialize (disable) PF deterioration offset.
– Retrieve device information

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