Sharp MX4100 MX4101

[buzz]

Light washed out areas, black only.
CMY OK
See test sheets for sample
Swapped cyan and blk drum same, no change.
Dev mag brush looks even (not tiger striping)

Resized_20200916_114606.jpg

I'm leaning towards Main Charge Receptacle but wanted your thoughts on this old box

Thanks!

[rspicer]

Re: Sharp MX4100 MX4101

I would also check primary transfer.

[mojorolla]

Re: Sharp MX4100 MX4101

I would also check primary transfer.

Pull the IT belt out and remove the belt. Look at the FTR (first transfer rollers). If memory serves correctly, these PM kits came with the four rolls under the belt. Ensure the rear wall and belt contacts are free of toner. Also make sure LSU glass are clean and shutter is working.

[spanky]

Re: Sharp MX4100 MX4101

Run a black skyshot and stop the copier during this process.

Are the light areas showing on the drum?

If not are they showing on the transfer?

If not that leaves the second transfer.

[Hansen88]

Re: Sharp MX4100 MX4101

You can swap the black drum unit with one of the color ones and see if the problem moves to the color you swapped it with.

[OlliK1969]

Re: Sharp MX4100 MX4101

Hi

secondary transfer belt in the door

[chubblies]

Re: Sharp MX4100 MX4101

Remove laser, there is a solenoid in the laser cavity that operates the shutter that gets covered in toner. Either leave the shutter off or remove and clean the solenoid

[miller01123@gmail.com]

Re: Sharp MX4100 MX4101

Try the clutches on the main drive that lift the T1 rollers.

[buzz]

Re: Sharp MX4100 MX4101

You can swap the black drum unit with one of the color ones and see if the problem moves to the color you swapped it with.

Thank you, yes I did swap the drums and the problem did not follow the black drum. Thanks.

[buzz]

Re: Sharp MX4100 MX4101

Remove laser, there is a solenoid in the laser cavity that operates the shutter that gets covered in toner. Either leave the shutter off or remove and clean the solenoid

We had another copier to swap out the whole laser unit and the problem was still there.

[buzz]

Re: Sharp MX4100 MX4101

It ended up being the whole Primary Transfer Assembly that fixed the issue, thanks!