C458 Solid Vertical Color Bands

[joelea]

Have a C458 putting solid vertical bands on the prints, see attached. So far it does it with K and C and just started with M. It starts off feint then gets more solid in a few copies, it doesnt repeat on the same impression but next time it does it it will have moved a few mm. Its intermittent but can guarantee the issue will show in a run of 20 prints.

Have tried updating firmware to latest, HV board, Drums, Devs, Transfer Belt, Transfer Roller, PH Unit but issue still remains. The drum/belt cavity is pristine and the IDC sensors are clean. Theres no P codes in service mode.

Any ideas would be gratefully received.
Image111.jpg

[Gift]

Re: C458 Solid Vertical Color Bands

Once I had an issue with that holder assy for the 2nd transfer roller in the inner-door leading do weird lines across running direction. Not shure if it was related to the HV/ground contact or something else.

[Digital]

Re: C458 Solid Vertical Color Bands

Have you tried with another Power Supply Assy (A79JR7XXXX)? The board next to the ph unit.
But if you tried with all components maybe is the motherboard...

[4Toon]

Re: C458 Solid Vertical Color Bands

Had the same issue just the other month and it was doing yellow and magenta. I did everything you did to this one too. I ended up also getting a CCD code C6576 at the same time the DSM had me going out there to replace the wire that comes off the HV into the MFPB. So I ended up replacing that HV wire that the DSM want changed and then I changed out the power supply and CCD cable at the same time in hope to fix the 6576 issues and it did and also the lines have not came back. So I am not 100% sure if it was the HV wire to MFPB or it was the power supply at this point was just happy to have it fixed. Do with this information as you will, hope it helps a little wish I had a 100% fix for you.

[tsbservice]

Re: C458 Solid Vertical Color Bands

...the DSM had me going out there to replace the wire that comes off the HV into the MFPB...

Technically speaking it's going from MFPB into HV board because MFP is the brain telling the body(HV) what to do.
But yeah your DSM is good I think it's probably the wires. Have you got a picture there are two from MFPB to HV.
I had one doing strange things - 2 of drums have extremely high Vdc and Vg and changing HV board did nothing so I may try your resolution.

[allan]

Re: C458 Solid Vertical Color Bands

Have a C458 putting solid vertical bands on the prints, see attached. So far it does it with K and C and just started with M. It starts off feint then gets more solid in a few copies, it doesnt repeat on the same impression but next time it does it it will have moved a few mm. Its intermittent but can guarantee the issue will show in a run of 20 prints.

Have tried updating firmware to latest, HV board, Drums, Devs, Transfer Belt, Transfer Roller, PH Unit but issue still remains. The drum/belt cavity is pristine and the IDC sensors are clean. Theres no P codes in service mode.

Any ideas would be gratefully received.
[ATTACH=CONFIG]61385[/ATTACH]

LEF or SEF?

[joelea]

Re: C458 Solid Vertical Color Bands

LEF or SEF?

LEF

I did notice that after i had tried all those parts if it's SEF it didn't do it but it could just have been a coincidence, as soon as it was LEF it did it again. I was out of gas at that point, I asked the previous engineer and he was adamant it did it SEF for him. I haven't been back since as I wanted to look into it a bit more but i've now swapped the machine for a loan one so I can work on it back in the workshop

[allan]

Re: C458 Solid Vertical Color Bands

LEF

I did notice that after i had tried all those parts if it's SEF it didn't do it but it could just have been a coincidence, as soon as it was LEF it did it again. I was out of gas at that point, I asked the previous engineer and he was adamant it did it SEF for him. I haven't been back since as I wanted to look into it a bit more but i've now swapped the machine for a loan one so I can work on it back in the workshop

Good advice given.

You are for sure loosing charge intermittently. Could be the HV not supplying or the charge current that gets grounded. It can be any of the drums or other parts that use HV that can cause the problem. Good luck finding the problem.

[4Toon]

Re: C458 Solid Vertical Color Bands

Technically speaking it's going from MFPB into HV board because MFP is the brain telling the body(HV) what to do.
But yeah your DSM is good I think it's probably the wires. Have you got a picture there are two from MFPB to HV.
I had one doing strange things - 2 of drums have extremely high Vdc and Vg and changing HV board did nothing so I may try your resolution.

It was happening intermitted for me too so every time I was there the MFP would not act up. One time I told them I would be back tomorrow walked away then came back to tell them something else and the issue then happened to them after them printing 200 pages for me on the first page after I left it happened, was a funny copier. The wires did not look off to me leading to the MFP but does not mean it was not arcing and making "noise". The wires leading to the CCD protective coating fell off with a touch to the wires witch was weird.

[joelea]

Re: C458 Solid Vertical Color Bands

I've got a lot of good answers here thanks everyone I'll have a good crack at it tomorrow and post back if I sort it.

[joelea]

Re: C458 Solid Vertical Color Bands

brought it back to workshop and ran 500 sheets with no lines so didn't fit any other parts, took it back to customer and it's been working fine for a week, now they rang to say the issue has returned and it's doing lines on all four colours

IMG_0237.jpg

[4Toon]

Re: C458 Solid Vertical Color Bands

I've got a lot of good answers here thanks everyone I'll have a good crack at it tomorrow and post back if I sort it.

brought it back to workshop and ran 500 sheets with no lines so didn't fit any other parts, took it back to customer and it's been working fine for a week, now they rang to say the issue has returned and it's doing lines on all four colours

[ATTACH=CONFIG]61494[/ATTACH]

I would do some of the things I said before looks like the same issue I had very intermittent. You could also throw a power monitor on it.

[4Toon]

Re: C458 Solid Vertical Color Bands

This is what mine looked like it always was different anytime it would do it some had lots of yellow on it some more magenta sometimes bigger lines sometimes very thin lines. I would replace power supply and the wire that goes from the MFPB to HV board and put a power monitor on it too.

[Digital]

Re: C458 Solid Vertical Color Bands

brought it back to workshop and ran 500 sheets with no lines so didn't fit any other parts, took it back to customer and it's been working fine for a week, now they rang to say the issue has returned and it's doing lines on all four colours

[ATTACH=CONFIG]61494[/ATTACH]

Have you tried changing any of the parts we suggested?