MX4501 VERTICAL BANDING

[copytechonline]

Hi All, ive got a bit of a problem with a 4501, the copier is giving vertical bands across the entire page at what looks to be mag roller width, but the thing is it is doing it on all colours. We have run through the CQ set up and all sets up ok. Example print below. A4R (landscape) as it shows the problem better also the print is only cyan as this is the worst affected the other colours do the same but not as obvious.
Have tried everythink I can think of, heres the list...

Primary trans bed
Secondary trans bed
Dev units
Drum units
LSU
Entire right hand side door ( have a spare)
Heater unit
PS Unit
Different shutters and shutter actuator
Main Drive unit
Every Motor on the back of the machine
Scanner PWB
MFP PWB
HV PWB
Tranfer PWB

And a lot of bloody time lol...
I have now run out of ideas, so I am putting it out there to the entire world as I can not get hold of our Sharp tech suport guy.


MX-3501N_20121127_154216_001.jpg

[Akitu]

Re: MX4501 VERTICAL BANDING

I think it could be a memory issue. I've seen similar effects on a 2700 when the RAM went bad. DIMM 1/2 are used by the copy/scan engine and DIMM 3/4 are used by the print engine. I'm going to assume that was a sim print, so best bet would be to replace the 256mb RAM located in DIMM 3 should my assumption be correct, as DIMM 4 is typically empty.

Also fits considering the list of items you've changed. Be sure it's properly calibrated by running sims
44-27
44-13 (if you have the jig UKOG-0318FCZ1)
50-22
Set 63-11 to def 2 for better cyan balance
63-08
44-02
44-06
44-26
46-24 (select factory, run 3x)
44-26 again

Repeat a similar procedure for the print engine
67-26 to def 2 for better cyan balance
67-28
67-24 (select factory, run 3x)
44-26

That will be a full on calibration, not sure if you've done anything similar to this or not, but I figured it would be a good place to start. If you have the calibration jig then run that as well where I listed it. Check back on all of the above and report back if it helped or not and we can proceed from there!

[copytechonline]

Re: MX4501 VERTICAL BANDING

I think it could be a memory issue. I've seen similar effects on a 2700 when the RAM went bad. DIMM 1/2 are used by the copy/scan engine and DIMM 3/4 are used by the print engine. I'm going to assume that was a sim print, so best bet would be to replace the 256mb RAM located in DIMM 3 should my assumption be correct, as DIMM 4 is typically empty.

Also fits considering the list of items you've changed. Be sure it's properly calibrated by running sims
44-27
44-13 (if you have the jig UKOG-0318FCZ1)
50-22
Set 63-11 to def 2 for better cyan balance
63-08
44-02
44-06
44-26
46-24 (select factory, run 3x)
44-26 again

Repeat a similar procedure for the print engine
67-26 to def 2 for better cyan balance
67-28
67-24 (select factory, run 3x)
44-26

That will be a full on calibration, not sure if you've done anything similar to this or not, but I figured it would be a good place to start. If you have the calibration jig then run that as well where I listed it. Check back on all of the above and report back if it helped or not and we can proceed from there!

Hi there Akitu thanks for your coments i have already ran through the set up procedure using the jig, it happens on copies and prints, I have replaced the MFP PWB from another copier so in effect it has had a completly different set of memory chips fitted, im begging to wonder if I have bad earth somwhere or may be a damaged harness.

[JustManuals]

Re: MX4501 VERTICAL BANDING

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Paul@justmanuals.com

[Akitu]

Re: MX4501 VERTICAL BANDING

Hi there Akitu thanks for your coments i have already ran through the set up procedure using the jig, it happens on copies and prints, I have replaced the MFP PWB from another copier so in effect it has had a completly different set of memory chips fitted, im begging to wonder if I have bad earth somwhere or may be a damaged harness.

Ah, well then now that we have all the details... It leaves us kind of nowhere. You've replaced just about every part of that machine if what you say is true.

When you replaced the primary transfer belt, did you swap out the entire unit or just rebuild a new one? I've said it a dozen times before, but the primary transfer belt gear can break on the pin it sits on causing ALL kinds of funny issues, this could be one of them. I'm sure anyone who's seen this gear break can attest to one of many different symptoms they were experiencing.

[draph]

Re: MX4501 VERTICAL BANDING

Does your machine have or require the updated housings for the developing unit contacts in the back of the machine? They can cause a lot of wierd problems.

[mojorolla]

Re: MX4501 VERTICAL BANDING

Run an internal test print like 64-5. Do a panic stop by pulling a door open while it is printing. I always try this before breaking the bank on parts. Try to stop it when the sheet is in the following areas:
-between the IT belt and drum units. You can look at the image on the belt and drum surfaces. If they show streaks, you have a charge issue
-between the IT belt and second transfer. If belt image looks good until here, it's a transfer issue. Does this unit have a PTC unit and the pwb?
-between transfer and fusing. The image will be unfused, but if carefully extracted, it will show the complete result of transfer. If that looks good, it is the fuser.

It may take a few tries to get the timing right, but it helps a lot on those head scratchers.
What does a monochrome print look like?

[CCS]

Re: MX4501 VERTICAL BANDING

I would just swap the whole machine out with another 4501 and save it for parts, these machines are only around $250 now wholesale with low meters, save yourself the time and $ and headaches...