Bh 451 image offsets on duplex second side

[Terna247]

I got a call earlier today: the machine can run simplex perfectly, but not duplex whether fed manually or automatic front and back. The face will be OK but the back kind of offsets on all colors. Ran test prints turned the back, repeated, same offsets. Now my attempts;

1. transfer roller inspection
2. checked the fuser unit

1. changed the right door.
2. replaced the prcb.

No success.

[allan]

Re: Bh 451 image offsets on duplex second side

Any warning codes(oil can icon) on the machine?

[Terna247]

Re: Bh 451 image offsets on duplex second side

No ALLAN. no warning codes but what I gathered is that the other technician working on the machine changed the IU CHIPS for all.

[Bix]

Re: Bh 451 image offsets on duplex second side

Maybe it's time to replace UI.
It is not always enough to replace the chip

[Synthohol]

Re: Bh 451 image offsets on duplex second side

Unfortunately there are two definitions of offsets one happens to be that it acts like a printing press reprinting the previous image the other is a registration offset if you have a problem with second side registration see how it is with the internal Prince like pentameter sheet or the font list two-sided see if that's okay if it prints okay then maybe we're just down to ATF registration where use that A4 sheet with a big black box and calibrate the feeder to read the document correctly let us know

[Terna247]

Re: Bh 451 image offsets on duplex second side

Maybe I never really explained myself; I ran some copies even the test page on the front side of the paper when I turned to run on the back side of the same paper, the image doesn't copy properly. IT COPIES WITH MOST OF THE IMAGE LOOKING FADED. NOW I WAS TOLD THE LAST TECHNICIAN CBANGED EVEN THE WHOLE RIGHT DOOR. This were my further attempts on this 451,

• stopped the machine half way in print to look at the image on the itb
• stopped half way again at the second side of the paper... the image was well copied on the itb.
• stop half way with A3 paper half way again, this time around removed the Itb of the first side to look at the formed image, great. DID same on the second side of paper. STILL GREAT.
• as of now i just cleaned the IDC sensors, yet to fix back the ITB but if thjs last step doesn't work i am really screwed up here...
• you remain my last hope lest this beaut heads to scrap prompt.

[Terna247]

Re: Bh 451 image offsets on duplex second side

Allan, bix, symthohol thanks so far

[allan]

Re: Bh 451 image offsets on duplex second side

Could help.
You can adjust the transfer fine adjust on each side.
Its under <Image Process Adjust> <Transfer Fine Adjust>
Worked for me before.

Transfer.jpg

From a 452, 451 manual is corrupt...
Make sure the voltage gets to the roller proper.
Big word for me to use, the permeability of the paper changes after going thru the copy process and that causes
the second side to need more pixie pressure.

[Terna247]

Re: Bh 451 image offsets on duplex second side

OK I've been there but not with the primary. I did secondary transfer fine adjustments first and second, no success. Just surprise how the image formed well on the itb but passes almost straight back to the cleaner.

[Terna247]

Re: Bh 451 image offsets on duplex second side

OK I've been there but not with the primary. I did secondary transfer fine adjustments first and second, no success. Just surprise how the image formed well on the itb but passes almost straight back to the cleaner.

[Terna247]

Re: Bh 451 image offsets on duplex second side

OK I've been there but not with the primary. I did secondary transfer fine adjustments first and second, no success. Just surprise how the image formed well on the itb but passes almost straight back to the cleaner.

[allan]

Re: Bh 451 image offsets on duplex second side

If you have a spare HV board give that a go. Make sure there is no current leak or poor connection somewhere.

Try a different transfer roller.

[Terna247]

Re: Bh 451 image offsets on duplex second side

Allan, thanks, I got one. Feed you y'all back morrow.
Both High V. Board and roller assy.