Bizhub C558 conversion from 110V to 220V

[timemaster]

Hi,

I’m encountering a strange issue and could use some advice.

I have two C558 units, both originally designed for 110V. They work perfectly, but here in the EU (220V) I’ve been running them through a voltage converter. The converter works, but it’s expensive, constantly draws power, generates heat, and isn’t ideal for long-term use.

To avoid the converter, I sourced all the components needed for a 230V conversion:

• A795M40B00 – Power source (230V)
• A79JM40H00 – Noise filter (230V)
• A79KM40D00 – Fixing coil (230V)

As far as I can tell, these are the only components directly connected to live mains voltage.

However, after installing them, the printer powers on but immediately shows the error:
C-3B09 – IH Communication Error.

The only “signal” connection in this chain comes from the noise filter, which has a small three-pin data connector. I followed the full troubleshooting steps from the service guide:

• Checked all connections and fuses
• Replaced all of the above components (I have spares for each)
• Verified that all parts seem to work properly

Despite this, the printer seems to expect some different signal—possibly from the noise filter—than what it’s receiving. I can’t find any other relevant components in the mains path.

I even wiped the storage partitions and reinstalled the firmware, but the problem persists. This leads me to think it could be either:

• A service mode setting telling the printer to expect a different value from the noise filter, or
• Something entirely unrelated that I’m overlooking

Does anyone have ideas on what I should check next?

[Synthohol]

the FUPU board is different for that market region too.
id start there.

[timemaster]

Are you referring to a fuser unit or something else? I couldn’t find a fupu board by a quick search.

[Synthohol]

my bad, the diagram was a 4 series, i thought i clicked on the 8 series parts book however...

in the parts manual any electric component with a different market ie: usa is a B and europe is a C so when you see the same part with 2 different #s and its offered for B and C then it makes sense that different boards/sensors from a different market and twice the voltage may cause a hiccup somewhere in the soup.
you may have to page through and see what other board may be different. if it was a USA machine before then the paper size sensors under the glass are for US sizes. there are metric sensors to be added for metric area i believe, at least they used to.
could be bit switches not for europe enabled.
sounds like a huge undertaking, im curious if you get this to work!

[tsbservice]

timemaster
Great post I tip my hat to you.
I would like to help but seems you did your homework well and I need some time to investigate manuals.
Stay tuned and drink awesome Chech beer 🍺

[copyman]

I would think the fuser or the IH that heats fuser would be different between voltages?

[timemaster]

I’ll try replacing the fuser unit again. While it doesn’t connect directly to the mains voltage, it does come in separate 110V and 220V variants, so it’s possible it’s sensing something from the fixing coil, which is connected directly to the mains.

[timemaster]

Hmm, so this is the procedure:

1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the fusing unit-MFPB CN22E for proper connection and correct or change as necessary.
4. Check the connector between MFPB CN13E-NFB CN3 for proper connection and correct as necessary.
5. Check the connector between NFB CN2-IHPU CN1 for proper connection and correct as necessary.
6. Check the connector between IHPU-IHC for proper connection and correct as necessary.
7. Check the connector between IHC-IHMEB for proper connection and correct as necessary.
8. Replace the fusing unit. ((bizhub C658/C558) Part# A79JR71066 (bizhub C458) Part# A79MR70222)
9. Replace IHC. (Part# A79JM40C00)
10. Replace IHPU. (Part# A8KNM40A02)
11. Replace IHMEB. (Part# A796H00W00)
12. Replace MFPB. (C458 Part# A79MH02102 / C558 or C658 Part # A79JH02102)
13. Replace NFB. (Part# A795M40J00)

Connections are fine. The fusing unit, IHC, NFB, and IHPU have been replaced, so only two boards could cause the issue.
The MFPB is the computer mainboard, which I didn’t want to replace because I don’t believe it’s necessary. If it’s a mainboard failure, there must be a firmware difference, which should be possible to flash instead of replacing.

There’s one board I don’t know what it is: IHMEB, as shown in the attached picture.

Screenshot 2025-08-14 at 11.48.57.png


Maybe I failed some configuration steps when I was loading a new software on it

[tsbservice]

IHMEB(IH magnetic erasing board) may be the culprit try to replace it.

[timemaster]

It’s going to be that mainboard. I’ve been searching for the exact part because I didn’t understand the purpose of this board.
I found this: IHMEB (IH magnetic erasing board) mentioned in the procedure matches with a part number with the description of PWB Assembly (PWB-CR ASSY), which is completely different description in my head
When I finally found what it is, it’s a relay board with absolutely nothing on it. There’s a relay and two wires to close it. This works for sure because I can easily test it, and it also works fine with the 110V parts. The control voltage to the relay is something small DC, not live.