Bizhub C252 faint copies with P 26 & P 29 warning code

[Juggy]

We are experiencing a problem of Blank / very faint copies on C252c with an P26 & P29 warning status after replacing a new Transfer belt unit. This problem appeared immediately after 10-20 copies.

Problem: P26 & P29 warning displayed with intermittent P5,6,7,8 and 21 messages displayed.
Action taken so far
1. New Transfer belt replaced, new C,Y and M drum unit replaced
2. Latest Firmware upgraded
3. NVRAM recovery done
4. Checked and cleaned all contacts to Transfer belt

[pepper38_cnd]

This may sound like a dumb question, but if this happened right after changing the transfer belt, did you try putting the old belt back in or try a different belt?

[Juggy]

yes i tried first with old Transfer belt and the problem didnt disappear and then i again tried up with a brand new Transfer belt out of the box and still no luck

[pepper38_cnd]

Everything seems to point at the Transfer belt, But one thing to check is that the print heads haven't been knocked out of position remove the IU's and look at the gears that adjust the print heads they should mesh together, If they don't then grab the front of each print head and gently rock it you will feel it click back to it's proper position.

I am assuming that the transfer belt you put in was new and not a fused unit, if it was fused and the wrong value fuse was used you may have taken out a board.

[Juggy]

Problem solved by replacing HV1 power supply

[aussie]

Try cleaning AIDC sensors under transfer belt

[ni311]

P-26: 1st image transfer ATVC (Black) failure

Relevant Electrical Parts
High Voltage Unit (HV1)
Mechanical Control Board (PWB-M)
Image Transfer Belt Unit


1 Check the contact of the Transfer Belt Unit and that of HV1 for connection and clean or correct
the contact as necessary.
2 Change the Image Transfer Belt Unit.
3 Change HV1.
4 Change PWB-M.