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390

OKI printer error code 390: paper jam at multipurpose MP tray

Verified with sources10 sourcesReviewed Oct 18, 2026
Technician coming? See the 2 steps they must show you
Home office laser multifunction printer
Túllio FCC BY-SA 4.0Image source

Risk level

Medium

Proceed carefully and stop if the check is unclear.

Urgency

Medium

Quick answer

Error code 390 on an OKI laser printer or MFP indicates a paper jam at the multipurpose tray (MP Tray). Open the scanner unit and top cover without touching the hot fuser, lift out the image drum, open the transparent resist guide to pull the sheet out, and check the MP tray feed roller.

Safety first

Stop and check this first

  • The fuser inside the top cover is extremely hot: never touch the fuser unit when clearing a paper jam.
  • Do not expose the removed image drum to direct sunlight or light of 1,500 lux or more, and never leave it in room light for 5 minutes or more.

Safe checks you can perform

  • Open the scanner unit and top cover and lift out the image drum safely
  • Open the transparent resist guide, pull out the jammed sheet, and reseat the drum
  • Verify the MP tray feed roller is raised and reload media properly
  • Clean the MP tray paper feed rollers with a well-wrung damp cloth

Leave these tasks to a qualified professional

  • Do not attempt this professional task: Inspect the MP tray roller guide latch and feed clutch assembly
  • Do not attempt this professional task: Check the transparent resist guide and registration entry sensor

What a technician must be able to justify

Technician visit

These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.

These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.

  1. Inspect the MP tray roller guide latch and feed clutch assembly

    What they doIf the MP tray paper feed roller repeatedly drops down or fails to turn and triggers error 390, a technician must inspect the roller guide tabs, spring mechanism, and MP tray feed clutch.

    They must show youthe secured roller guide assembly and a successful multi-sheet test print from the MP tray without error 390.

    In writingthe error 390 diagnosis, the MP tray components repaired or replaced, and the functional test result.

  2. Check the transparent resist guide and registration entry sensor

    What they doWhen sheets stall beneath the transparent resist guide despite clean rollers and proper loading, official OKI service must inspect the registration sensor actuator and entry chute ahead of the image drum.

    They must show youan unobstructed registration path and smooth MP tray feeding on a test job.

    In writingthe verified cause in the registration section and post-service verification.

Before accepting a part or repair

Nothing has been shown yet. Do not accept a part swap based on the code alone.

Follow these steps

Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.

  1. Open the scanner unit and top cover and lift out the image drum safely

    No special tools

    Who:
    you, keeping hands away from the extremely hot fuser.
    How:
    remove any documents from the ADF or glass, open the scanner unit, press the top cover open button to open the top cover, lift the image drum out gently by its handle with both hands and the toner cartridge attached, set it on a flat surface covered with paper, and cover it with black paper so it is not exposed to 1,500 lux or more or room light for 5 minutes or more.
    Result that matters:
    exposing the internal transparent resist guide while protecting the image drum from light and heat.
    If the image drum lifts out cleanly and is covered from light:
    proceed to open the transparent resist guide.
    If the image drum resists removal:
    do not force the gears or touch the green drum surface underneath.
    Evidence to keep:
    photo of Error: 390 on the operator panel.

    Evidence: OKI MB492/MB562 Web Manual - If the Error Code is 390 · OKI MB492/MB562 Web Manual - Error Message List · OKI MB492/MB562 Web Manual - Loading Paper in the MP Tray · OKI MB492/MB562 Web Manual - Cleaning the Paper Feed Rollers (MP Tray) · OKI MB492/MB562 Web Manual - Available Paper Types

  2. Open the transparent resist guide, pull out the jammed sheet, and reseat the drum

    No special tools

    Who:
    you.
    How:
    open the transparent resist guide in the direction of the arrow, pull the jammed sheet out gently by its top end (moving it in the arrow direction first if only the middle is visible), align the right and left pegs (1) of the image drum into slots (2), and close the top cover and scanner unit.
    Result that matters:
    removing the sheet trapped at the MP tray feed entrance and closing the imaging path.
    If the sheet comes out whole and pegs (1) seat into slots (2):
    error 390 clears when the covers close.
    If the paper tears and leaves a scrap inside the guide:
    do not probe inside with sharp tools.
    Evidence to keep:
    check that the removed sheet is complete with no missing corners.

    Evidence: OKI MB492/MB562 Web Manual - If the Error Code is 390 · OKI MB492/MB562 Web Manual - Error Message List · OKI MB492/MB562 Web Manual - Loading Paper in the MP Tray · OKI MB492/MB562 Web Manual - Cleaning the Paper Feed Rollers (MP Tray) · OKI MB492/MB562 Web Manual - Available Paper Types

  3. Verify the MP tray feed roller is raised and reload media properly

    No special tools

    Who:
    you.
    How:
    open the MP tray forward, unfold the paper supporter, check if the paper feed roller has fallen down and raise it back into place; adjust the manual feeding paper guide, load paper print-side up below the limit mark (up to 100 sheets at 80 g/m2 or 10 envelopes at 85 g/m2) without pressing down on the paper during printing, and set Paper Size, Media Type, and Media Weight.
    Result that matters:
    ensuring the MP tray feed roller is in position and paper settings match the stack.
    If the roller was down and clicks back up into position:
    test a single print from the MP tray.
    If the roller is raised properly but sheets still slip:
    clean the MP tray rollers as described next.
    Evidence to keep:
    position of the MP tray roller and Paper Setup settings.

    Evidence: OKI MB492/MB562 Web Manual - If the Error Code is 390 · OKI MB492/MB562 Web Manual - Error Message List · OKI MB492/MB562 Web Manual - Loading Paper in the MP Tray · OKI MB492/MB562 Web Manual - Cleaning the Paper Feed Rollers (MP Tray) · OKI MB492/MB562 Web Manual - Available Paper Types

  4. Clean the MP tray paper feed rollers with a well-wrung damp cloth

    No special tools

    Who:
    you.
    How:
    open the empty MP tray, close it halfway until the left and right tabs (1) fit into the grooves (2) of the arms, spread the two arms slightly outward to release tabs (3) of the roller guide, raise the roller guide against the machine body, wipe the rollers with a wet cloth wrung out well, and lower the guide until it locks before closing the MP tray.
    Result that matters:
    restoring grip on the MP tray paper feed rollers by removing paper lint.
    If the rollers are clean and tabs (3) lock the roller guide back into its original position:
    run a test print.
    If error 390 persists after cleaning the rollers and locking the guide:
    have official OKI service inspect the MP tray feed assembly.
    Evidence to keep:
    note of the MP tray roller cleaning completed.

    Evidence: OKI MB492/MB562 Web Manual - If the Error Code is 390 · OKI MB492/MB562 Web Manual - Error Message List · OKI MB492/MB562 Web Manual - Loading Paper in the MP Tray · OKI MB492/MB562 Web Manual - Cleaning the Paper Feed Rollers (MP Tray) · OKI MB492/MB562 Web Manual - Available Paper Types

Still not solved

If the error persists, stop here. See what the technician must do and show you.

Where this code applies

A code is meaningful only inside the right product and version context.

Primary scope

System
Printers
Brand
OKI
Product type
Laser printer

Known code variants

  • 390
  • Código de error 390
  • Error 390
  • Error 390 : MP Tray
  • Error 390: Bandeja multiuso
  • Error code 390
  • Error: 390

What it means

In the official OKI MB492 and MB562 Web Manual (Error Message List and If the Error Code is 390 procedure), error code 390 identifies a paper jam at the MP Tray with the prompt to open the scanner unit and top cover to check inside. It occurs when media fed from the front multipurpose tray stalls at the transparent resist guide ahead of the image drum. Other OKI models may vary, and this error code alone never proves a hardware part is defective.

Warnings and stop conditions

  • Highsource verified

    The fuser inside the top cover is extremely hot: never touch the fuser unit when clearing a paper jam.

    Evidence: OKI MB492/MB562 Web Manual - If the Error Code is 390 · OKI MB492/MB562 Web Manual - Error Message List · OKI MB492/MB562 Web Manual - Loading Paper in the MP Tray · OKI MB492/MB562 Web Manual - Cleaning the Paper Feed Rollers (MP Tray) · OKI MB492/MB562 Web Manual - Available Paper Types

  • Mediumsource verified

    Do not expose the removed image drum to direct sunlight or light of 1,500 lux or more, and never leave it in room light for 5 minutes or more.

    Evidence: OKI MB492/MB562 Web Manual - If the Error Code is 390 · OKI MB492/MB562 Web Manual - Error Message List · OKI MB492/MB562 Web Manual - Loading Paper in the MP Tray · OKI MB492/MB562 Web Manual - Cleaning the Paper Feed Rollers (MP Tray) · OKI MB492/MB562 Web Manual - Available Paper Types

Symptoms and causes

Probable causes · in order

  • MP tray paper feed roller dropped out of place after forceful opening or closingCommon

    The OKI Web Manual notes that opening or closing the MP tray vigorously can cause the paper feed roller to fall down, immediately causing misfeeds and error 390.

    Evidence: OKI MB492/MB562 Web Manual - If the Error Code is 390 · OKI MB492/MB562 Web Manual - Error Message List · OKI MB492/MB562 Web Manual - Loading Paper in the MP Tray · OKI MB492/MB562 Web Manual - Cleaning the Paper Feed Rollers (MP Tray) · OKI MB492/MB562 Web Manual - Available Paper Types

  • Paper loaded above the limit mark, mixed media sizes, or pressing sheets while feedingPossible

    Exceeding the MP tray capacity of 100 sheets of 80 g/m2 (20 lb) paper or 10 envelopes, mixing sizes or weights, or pressing down on the stack during printing causes jams.

    Evidence: OKI MB492/MB562 Web Manual - If the Error Code is 390 · OKI MB492/MB562 Web Manual - Error Message List · OKI MB492/MB562 Web Manual - Loading Paper in the MP Tray · OKI MB492/MB562 Web Manual - Cleaning the Paper Feed Rollers (MP Tray) · OKI MB492/MB562 Web Manual - Available Paper Types

  • Dust or paper lint on the MP tray paper feed rollersPossible

    Paper dust buildup on the feed rollers beneath the MP tray roller guide reduces grip when feeding 60 to 163 g/m2 (16 to 43 lb) media or 85 g/m2 (24 lb) envelopes.

    Evidence: OKI MB492/MB562 Web Manual - If the Error Code is 390 · OKI MB492/MB562 Web Manual - Error Message List · OKI MB492/MB562 Web Manual - Loading Paper in the MP Tray · OKI MB492/MB562 Web Manual - Cleaning the Paper Feed Rollers (MP Tray) · OKI MB492/MB562 Web Manual - Available Paper Types

  • Mismatched Paper Size, Media Type, or Media Weight in Paper SetupLess common

    If the Paper Size, Media Type, and Media Weight configured for the MP tray on the touch panel do not match the loaded stock, the sheet halts at the registration entry.

    Evidence: OKI MB492/MB562 Web Manual - If the Error Code is 390 · OKI MB492/MB562 Web Manual - Error Message List · OKI MB492/MB562 Web Manual - Loading Paper in the MP Tray · OKI MB492/MB562 Web Manual - Cleaning the Paper Feed Rollers (MP Tray) · OKI MB492/MB562 Web Manual - Available Paper Types

Virtual technician

Does 390 still appear after these checks?

Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.

Start diagnosis

Sources and technical references

  1. 1

    OKI MB492/MB562 Web Manual - If the Error Code is 390

    OKI Data Corporation · 2014 · official_doc

  2. 2

    Manual Web OKI MB492/MB562 - Si el código de error es 390

    OKI Data Corporation · 2014 · official_doc

  3. 3

    OKI MB492/MB562 Web Manual - Error Message List

    OKI Data Corporation · 2014 · official_doc

  4. 4

    Manual Web OKI MB492/MB562 - Lista de mensajes de error

    OKI Data Corporation · 2014 · official_doc

  5. 5

    OKI MB492/MB562 Web Manual - Loading Paper in the MP Tray

    OKI Data Corporation · 2014 · official_doc

  6. 6

    Manual Web OKI MB492/MB562 - Cargando papel en la bandeja multiuso

    OKI Data Corporation · 2014 · official_doc

  7. 7

    OKI MB492/MB562 Web Manual - Cleaning the Paper Feed Rollers (MP Tray)

    OKI Data Corporation · 2014 · official_doc

  8. 8

    Manual Web OKI MB492/MB562 - Limpieza de los rodillos de alimentación de papel (Bandeja multiuso)

    OKI Data Corporation · 2014 · official_doc

  9. 9

    OKI MB492/MB562 Web Manual - Available Paper Types

    OKI Data Corporation · 2014 · official_doc

  10. 10

    Manual Web OKI MB492/MB562 - Tipos de papel disponibles

    OKI Data Corporation · 2014 · official_doc

Sources: OKI MB492/MB562 Web Manual - If the Error Code is 390 · Manual Web OKI MB492/MB562 - Si el código de error es 390 · OKI MB492/MB562 Web Manual - Error Message List · Manual Web OKI MB492/MB562 - Lista de mensajes de error · OKI MB492/MB562 Web Manual - Loading Paper in the MP Tray · Manual Web OKI MB492/MB562 - Cargando papel en la bandeja multiuso · OKI MB492/MB562 Web Manual - Cleaning the Paper Feed Rollers (MP Tray) · Manual Web OKI MB492/MB562 - Limpieza de los rodillos de alimentación de papel (Bandeja multiuso) · OKI MB492/MB562 Web Manual - Available Paper Types · Manual Web OKI MB492/MB562 - Tipos de papel disponiblesreviewed 2026-10-18 · verified

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