C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

[Phrag]

Hi guys.

I've got a really frustrating issue with a C451.

The Magenta/Cyan/Yellow or Black image is skewed by about 2 or 3 degrees.

I initially had a call or A C225B code (K PC drum motor malfunction) for which I replaced the K drum. We believe we've managed to fix this problem (after replacing the K drive motor, PRCB, DCPU & Firmware), but it's got a P-14 code and skewed colours.

We've changed MFPB, PRCB, DCPU, Registration sensor assembly located below the transfer belt, replaced the transfer belt and laser assembly, but this skew has come back.

This machine is supposed to get replaced in a month, and I've already spent a good 6 or 7 hours on this machine in the past 3 days.

Does anyone have any idea as to what on earth is going on?

The CMY I/U's haven't been replaced, as we seemed to be focused on getting rid of the C225B code. Perhaps I should change those, but as it's supposedly being replaced in a month, the boss man may not want to throw so much money at it.

[JustManuals]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

This Parts & Service Manual can now be purchased for $12.77 and downloaded immediately after payment from:

http://www.justmanuals.com

Paul@justmanuals.com

[Phrag]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

Changed the I/U's. That barely worked (after stabilizing). Changed the PH Relay Board, and at first it made it worse, but after I decided to give up for the day, put the machine back together, it fixed itself up. It's almost 100%, but it's still visible if you have black text over a coloured background. The customer is satisfied, considering it's up for renewal in a month.

Is there a way to manually adjust the skew wither physically or digitally?

[habik]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

Changed the I/U's. That barely worked (after stabilizing). Changed the PH Relay Board, and at first it made it worse, but after I decided to give up for the day, put the machine back together, it fixed itself up. It's almost 100%, but it's still visible if you have black text over a coloured background. The customer is satisfied, considering it's up for renewal in a month.

Is there a way to manually adjust the skew wither physically or digitally?

Page 458 in service manual

Service Mode> Machine > Skew Adjustment > lift it up by few 10s on the colour it is the worst, or if Bk then all 3 by the same number

or

Page 457 once you are happy with Skew Adjustment!

[avecosat]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

Have you a P31 also ?

[Phrag]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

Have you a P31 also ?

Negative.

It seems to be fixed for now. It's more or less aligned now. On inspection, the old Relay Board had a damaged chip on it. The housing was cracked, a little melted plastic, and instead of just sizzling softly, it look like the area around one of the pins had exploded and shot black plastic onto a nearby connector.

[BennyAU]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

there is also a firmware update for this specific p14 after replacing black iu issue

TABT1000703EN

[Phrag]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

there is also a firmware update for this specific p14 after replacing black iu issue

TABT1000703EN

Cheers for that.

[Synaux]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

Hi guys.
The Magenta/Cyan/Yellow or Black image is skewed by about 2 or 3 degrees.

Is this on all prints?
if its worse on 11x17 then you might want to try this:
Try replacing the guide plate replacing the Paper Dust Removal Guide & Guide Plate with the C652/C552/C452 type.
Paper Dust Removal Guide assembly: p/n A00J R723 00 (current)replace with p/nA0P0 R731 00.
Guide Plate: p/n A00J 7022 01 (current)replace with p/n A0P0 7022 00.

Also 10.4.7 Printer Resist Loop in the service manual.

[Synaux]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

there is also a firmware update for this specific p14 after replacing black iu issue

TABT1000703EN

Interesting...but I cannot find TABT1000703EN in the compiled bulletins or in SSD search?

[Phrag]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

Is this on all prints?
if its worse on 11x17 then you might want to try this:
Try replacing the guide plate replacing the Paper Dust Removal Guide & Guide Plate with the C652/C552/C452 type.
Paper Dust Removal Guide assembly: p/n A00J R723 00 (current)replace with p/nA0P0 R731 00.
Guide Plate: p/n A00J 7022 01 (current)replace with p/n A0P0 7022 00.

Also 10.4.7 Printer Resist Loop in the service manual.

It was on everything. And it wasn't the whole image that was skewed, it was just the black (I think.) If it wasn't the black, it was CMY.

Also, it was firmwared with the most recent update, which eliminated the C225B/C code (K PC Drum motor failure). I think I posted this earlier, but the Relay board had visibly failed. One of the silicon chips on the board had melted out around a pin.

[Synaux]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

It was on everything. And it wasn't the whole image that was skewed, it was just the black (I think.) If it wasn't the black, it was CMY.

Also, it was firmwared with the most recent update, which eliminated the C225B/C code (K PC Drum motor failure). I think I posted this earlier, but the Relay board had visibly failed. One of the silicon chips on the board had melted out around a pin.

Oh. Looks like I only read to Habik's post and thought that was all that was posted (or the page didn't completely load)...oops
Just out of curiosity, what FW version did you install--I wasn't able to find the bulletin referred to

[havokprod]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

Negative.

It seems to be fixed for now. It's more or less aligned now. On inspection, the old Relay Board had a damaged chip on it. The housing was cracked, a little melted plastic, and instead of just sizzling softly, it look like the area around one of the pins had exploded and shot black plastic onto a nearby connector.

I've also have had blown chip on the relay board....... it was effecting the cyan unit for me.

[Phrag]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

I've also have had blown chip on the relay board....... it was effecting the cyan unit for me.

The chip that blew for me was the one near the top right corner.

[sanee9493]

Re: C451 P-14 - Skewed Magenta/Cyan/Yellow or Black

p-14 is it related with drum motor at the back of mechine?? mine is C550 magenta skewed.. i tried all suggestion but still the same problem exist.. any others solution?