Question about Ricoh Aficio AP3800C Laser Printer

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Sc670 errormessage Can you tell me how to find the BCU board. I have an old 3800c that I have taken some boards out of before trashed it. I have been told that it is probably the BCU board that is bad but I am not sure where it is or what it looks like. Thanks BobJBoffset

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  • Anonymous Feb 28, 2008

    Fuser Jam.
    I recently replaced the BCU board to get rid of an erro message SC670, which it did. The machine now boots up normally but when I try to print it the sheet jams just as it is entering the fuser. It seem that the fuser is not turning to accept the sheet, it is warming up but does not take the sheet in. I am not sure if I might have distrubed something or if there is another problem. Please give me your thoughts on this.


    Bob G.



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I have replaced the BCU board with one salvaged from a machine which we got rid of.

Posted on Feb 28, 2008


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Posted on Jan 02, 2017


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Minha Ricoh SPC 430DN deu erro SC 563, podem me ajudar. Sou do Rio de Janeiro - Brazil

  • Code: 563
  • Description: Pressure roller overheat 3 (software error)
    The detected fusing roller temperature stays at 230°C or more for 1 second.
  • Causes: • Defective PSU • Defective BCU
  • Remedy: 1. Replace the pressure roller thermistor (center). 2. Replace the PSU. 3. Replace the BCU.
Ricoh Aficio SPC430DN Error Codes List page 11 from 17

Esto dice que es posible que el Photo Conductor Unit Copier Drum es malo o el Color Copier BCU Engine Control Board es malo.

Jan 26, 2018 | Ricoh Office Equipment & Supplies

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My ricoh mp 6000 is showing sc144 error what should i do

The error code indicates there is an SBU transmission error.

In other words, the machine is indicating that there is an error in the electronics of the machine, or a loose electrical/signal connection. It is an error that's a bit fuzzy.

The machine will issue the SC144, SBU transmission error because:
After the SBU switches on, the BCU detects one of the following conditions on the SBU:
- 1 second after power on, the SYDI signal does nok go high, even after 1 retry.
- 1 second after power on, the SYDI signal goes high, but the SBU ID could not be read after 3 attempts.

So what this actually means is that you have a number of potential reasons for the error code.
- The SBU is defective. The SBU is the Sensor Board Unit in the machine, that receives analog signals from the CCD (the image sensor) and converts these into digital signals used for image processing. Digital signals is important due to all the manipulations the machines does (and can do). The SBU is basically a fairly advanced analog to digital converter.

- The VIB can be defective. That is a video inteface board, located under the exposure glass, which interfaces the BCU and the IPU with the operation panel and SBU.

- If you are lucky it can also be a harness that is not connected properly.
Check the 40 pin shielded cable between the SBU and the VIB, og the shielded cable between the VIB and the BCU. The BCU is the Base Engine Control Unit), which is the main control board that controls engine sequence, timing for peripherals, image processing, and the video data path.

- The IPU (image prosessing unit) may be defective. This board processes images scanned by the CIS (contect image scanner, used inside the document feeder), and the SBU. The IPU is located on the back side of the swing out circuit board unit.

In the field a technician will check the connections, they may check for power at certain pins/locations on different board - or they have to start to change boards, and just see what's happening.

As with many error codes that may have many sources, a problem totally unrelated to the problem may be the actual cause of the error code.
I have experienced a defective ball bearing being the cause of an "advanced" error related to the power supply board for example.

Jul 03, 2017 | Ricoh Office Equipment & Supplies

1 Answer

Photo copier ricoh sc144

SBU Communication Error
  • Connection to SBU cannot be confirmed. (Connection detection error)
  • Cannot communicate with the SBU, or the communication result is abnormal.
  • SBU defective
  • The other side of the communication (BCU, IPU etc.) defective
  • Power/signal harness defective
  1. Turn the power off/on.
  2. Reconnect the power/signal harness.
  3. Replace the following parts:
    • Replace the SBU board.
    • Replace the IPU board.
    • Replace the BCU board.
    • Replace the power/signal harness.

Apr 11, 2016 | Ricoh Office Equipment & Supplies

1 Answer

Pro c900. What does error code sc544 mean?

SC 544
Heating roller thermopile (center) error 3 The thermopile detected a temperature over 260?C. • TRIAC short, AC drive board defective • Defective IOB 2 • Defective BCU sc_note_1.gif
Related SC code: SC 553, SC563 1. Do SP5810 to cancel the SC fusing code. 2. Replace the AC drive board. 3. Replace the IOB 2. 4. Replace the BCU.
GO TO SERVICE MODE AND SP5810 to Clear - Check temp inputs - SP5803 150, 151, 152

Mar 13, 2016 | Ricoh Office Equipment & Supplies

1 Answer

Code to solution problem 690sc

SC 690 - GAVD IC2 communication error.
690-001 :Y
Possible cause:loose connection,defective BCU,defective LD controller board.
Turn the main switch OFF and ON,check the cable connection,replace the laser optics housing unit or replace the BCU board.

Feb 17, 2013 | Ricoh Aficio 2232C Color Copier

1 Answer

My Ricoh aficio 3800c keeps stalling with error code sc220-4. How do I fix it?

Hi. The SC220 issue is a known one on the 3800c. It's a firmware related problem, and the code, which points to the synchronizing detector boards, is erroneous. You can read more about it, and possible ways to avoid it here.
Updating the firmware to get rid of this problem is not an easy job.

Nov 07, 2011 | Ricoh Aficio AP3800C Laser Printer

1 Answer

My Ricoh 3350B copier has displayed error SC670 can you tell me what this means?

This error meams that you have a communication error modem.
This may happened after a instalation. Did you install a new fax board?
Make sure that the fax board are well instaled. It have a jumper that needs to put it ON.

If this does not helps reply to me and give more info.

See you!

Jul 16, 2011 | Office Equipment & Supplies

1 Answer

Ricoh mp6500 sc670 error code

sc670 is an engine startup error. A lot of times if you reset the copier (turn it off with the orange switch on the left side of the front cover, then turn it back on) the error will go away. If it doesn't the BCU board may need to be replaced.

Mar 16, 2011 | Ricoh Aficio AP3800C Laser Printer

2 Answers

Error code SC670 shows up on my board

It’s an over load of information by the file.
Here is the actual code: SC670 mistake Engine Response.

It’s always a good idea to ask for a fix along with a question about an error code...
so what’s going on is no response from the BCU at power on; which means when the main power is turned on or the machine starts warming up from energy-saving mode, the controller does not receive a command signal from the BCU. So that could mean a

• Loose connection
• Defective controller
• Defective BCU

You can try these things:

1. Turn the main switch off and on.
2. Check the connection between the
BCU and controller.
3. Replace the controller.
4. Replace the BCU.
After replacing the BCU or controller, remove the NVRAM on the old board and put it on the new one.
If you have not worked on these units before you may need the help of a shop.

Mar 01, 2010 | Office Equipment & Supplies

2 Answers

When use adf with letter paper sise, push print botton then askme paper 5 1/2 X 8 1/2 inch´s, why do this?

is there any sensors on the adf unit, if so is the paper being feed into the adf unit, there might be a bad/defective sensor, try placing a letter size sheet on the document glass and make a copy, if it copies you have a problem with the adf, and it needs to be serviced

Feb 19, 2010 | Ricoh Aficio 2018D All-In-One Laser...

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