Canon IR 5570 fading issue

[Akitu]

Hi guys!

To start off with, I'm not a formally trained Canon tech so these things are a bit foreign to me in some of the concepts and parts inside the machine. I'm just the guy responsible for fixing it after taking over for Ricoh National service.

I have an IR5570 with a fading issue along the top as well as a void line lower down on the page. My former coworker reported having an issue with a pre-quenching lamp or some part with a name to that effect. Is this similar? I'm attaching a sample so someone can see what I'm trying to describe.

5570 sample.pdf

I've drawn in some arrows to best point out the problem areas. Standard config page with 2 notable light spots at the top in the "Configuration Page" banner, they appear to be charge related.

Under the PCL Settings the Fax Version line is almost gone completely from the page, I've checked the dev unit for debris potentially disturbing the dev buildup on the mag roller but it checked out.

If anyone has any suggestions at all that would be fantastic, as this thing has been giving me problems for far too long now.
If anyone read my previous post regarding a Canon 2020i, this machine is in the same building and I took over for a tech close to retirement who was putting large band-aids on larger problems.

[Tricky]

Re: Canon IR 5570 fading issue

The pre quenching lamp is more than likely the pre exposure leds in the process assembly. Go into service mode copier / test / pg type and set this 7 (solid black) this would give a better indication of the problem areas.

I would be looking at main charge and the pre transfer coronas, you can also get a build up of toner under the drum assembly which can wipe off toner before its fused.

[Akitu]

Re: Canon IR 5570 fading issue

The pre quenching lamp is more than likely the pre exposure leds in the process assembly. Go into service mode copier / test / pg type and set this 7 (solid black) this would give a better indication of the problem areas.

I would be looking at main charge and the pre transfer coronas, you can also get a build up of toner under the drum assembly which can wipe off toner before its fused.

Thanks for the response!

I'll be sure to try this out to see the full result. Will post the results.

My pre transfer corona did have a broken wire a while back, but it presented no CQ issues. The unit was changed out as a precaution when this image problem surfaced.

[zoraldinho]

Re: Canon IR 5570 fading issue

In service mode:COPIER > ADJUST > DENS>DENS-ADJ to decrease fading, increase the value.

[Akitu]

Re: Canon IR 5570 fading issue

Problem resolved!

I went on site and attempted to print out pattern 7. Initially it wasn't printing out anything at all, and after a reset would only print pattern 0. I gave up trying to get a test print and instead opted for a sky shot. My sky shot revealed the same 3 faded markings in the top of the page and a solid void line right in the same location as was on the config page.

After cracking it open I discovered the cleaner unit on the pre-transfer corona was not in the home position, and coincidentally right in the same spot as my void line. I removed the PCU and inspected the cleaning assembly, nothing was wrong and the drum was free of marks. Upon looking at the dev unit I noticed a very faint spot in the front frame side in an identical shape to my void mark. I shifted some dev over the void spot and rotated the roller and it seemed to fill in correctly.

My following test shots were all clear and free of any issues. Coincidentally, after reseating the drum and dev unit, my copier started printing test pattern 7. I would have to assume this may have been in relation to my cleaner unit in the pre-trans not being in the home position.

Thanks for all the help guys! You pointed me in the right directions and I learned some new tricks to pull with this pony.

[copymech]

These machines require tungsten wire for the primary corona to work reliably. If they are gold, I recommend replacing with tungsten.

[Akitu]

Re: Canon IR 5570 fading issue

These machines require tungsten wire for the primary corona to work reliably. If they are gold, I recommend replacing with tungsten.

I have no idea what type of corona wire they're strung with, my parts were supplied by a tech in another location who was a former Ricoh tech. I would assume they're tungsten just from looking at them, they don't appear to be gold. My main corona ass'y was ordered as is from Canon. If their default corona wire is tungsten, it's tungsten.

[Akitu]

Re: Canon IR 5570 fading issue

On another note - can someone tell me why my copier wasn't outputting any test patterns aside from 0? Would I be correct in making the assumption it was related to my cleaner unit not being in home position?