Question about Ricoh Aficio SP C420DN Laser Printer

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My Ricoh Aficio SP C420DN Laser Printer shows color tone SC366 and some time SC365, any ideas?

Question about Ricoh Aficio SP C420DN Laser Printer SC366 and some time SC365

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You just have a problem with colour PCU (SC 365 - magenta, SC366 - cyan). The main reason is that toner density is abnormal. Sometimes, when you replace toners, printer receive to much toner for a short time, and after that you have an abnormal toner density (higher). You can check in service mode (hold up and down arrows for 6-7 sec, release them and press ok button) following thing :
choose 2. engine
then with arrows choose 3. process
then choose Vt display,
for each color by default there should by somewhere arround 2.4V. If you see for some colors, for example 0.02V, then this is a problem(to much toner). In this case the only thing that you can do is to restart printer and try to print enough pages, filled with problem color. Usually you can print max 3 pages. Then restart printer and try another 3 pages. Print until the you will be able to print at least 4 pages continuously.
Good luck and remember that this is a technical problem and you should ask someone qualified for the job. I am sure that 80% of service engineers can't repair this issue. But I can.

Posted on Apr 17, 2015

Testimonial: "sory I printed blue paper, but the problem persists"

  • pifonski Apr 18, 2015

    i am doing technical support for Ricoh from 15 years. I have more than a 200 Spc420 printers hardly working in many diferent offices. Just check toner density for each color in service mode. LEAVE THE LASER ALONE.

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That code can indicate that the laser is no longer functioning and needs replacement.

Posted on Apr 17, 2015

Testimonial: "The Colour Blue ??? or waht"

  • Ted Baxter
    Ted Baxter Apr 18, 2015

    Laser either works or it doesn't on all colors. Take out the intermediate transfer unit which sits above the 3 color pcus and the one black pcu. Once removed, use a flashlight to look at each of the PCU's. Does one of the PCU's have a line of toner along the length while the other's are clean? If so, that pcu is not rotating. That would mean the gear that rotates the pcu is not engaged with the pcu. The gears can get stuck in a locked and disengaged position. Put some grease on the gears and pull the gear back and forth with needlenose pliers.

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