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Toshiba e-studios 5540c C390 C3A0

Just bought a used 5540C SE with finisher. $500/400k copies I know it's an old machine, but it still has some more copies to give. I'm getting a C390 error. Call service. Pulled the EPU tray and checked the connections I could see. Cleaned the sensor under cyan and reinstalled. Powered on and then got C3A0 error. Did same procedure with magenta. And the rest at the same time Powered on again and was back at C390. The machine has not been used for 4 years but had no errors when it was shut off. It was transported in a trailer but was properly secured. Of course, there was vibrations and some bumps when loading and unloading. it's one heavy mf. Any ideas on where to check? I would guess there is just something that has come loose somewhere or toner that has ended up on some sensor maybe.

Posted by Thomas Melbye on

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Pawel Nietyksza

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The C3A0 error code in a Toshiba e-studios 5540c copier usually indicates a problem with the magenta color developer unit. The C390 error code is a general error code that is usually displayed when a specific error cannot be determined.
To troubleshoot the issue, you can try the following steps:

  1. Check the connections of all the units, including the magenta developer unit, to make sure they are securely in place.
  2. Clean the sensors and contacts of the developer units and the main controller board.
  3. Check for toner or other debris that may have accumulated on the sensors or inside the developer units.
  4. Make sure the developer units are properly loaded with toner and are functioning correctly.
  5. If the issue persists, it may be necessary to replace one or more of the developer units or the main controller board.
If you are not comfortable with these procedures or the issue persists, it is recommended to contact a professional technician

It's possible that the EPU tray may have come loose during transport, leading to a C390 error

Posted on Feb 01, 2023

  • Thomas Melbye Feb 03, 2023

    Thank you,

    I have run 03-114 and 03-115. All 4 motors run as normal
    I have checked all connections and can’t find any loose connections anywhere. Checked the EPU and LGC board.
    Checked fuses just to make sure.

    I have lifted the entire EPU tray, cleaned the connections, lifted the drums and cleaned the sensor underneath.

    Replaced all toners as it was very low. Now the error has moved to C380.
    According to the error code list all the codes points to Auto-toner sensor abnormality (upper limit)
    C380 – K, C390 – C, C3A0 – M (just waiting for C3B0 Y)

    Its unlikely that all developers or sensors have gone bad at the same time.

    As its not showing C382, C392, C3A2 or C3B2 it indicates that the sensor is detected by the boards.

    I’m leaning towards toner compacting in developer during transport or that its covering some sensors.

    Found adjustment of the auto-toner sensor. 6.1.2 page 550 in the manual.

    It’s a little hassle but it will clear any compacted toner in the developer and it will refill the developer with the correct amount. Guess it also will reset the sensor.

    Is this a good idea or am I way off?


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Step 7: Turn on the machine with the power rocker switch.


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