Sharp AR-507 blank prints

[Guest]

no error code, high voltage wire intact, new toner, new developer

Hi, my sharp AR-507 photocopier has been giving me blank prints from both photocopying or computer network printing. there is no error code showing at all. I have added new toner, changed developer, I also checked the high voltage wires, cleaned them, and they are not broken. I have also adjust the sensor gains. when I turned it on, it sounds like DC unit motor and drum is rotating. but I found the drum unit very clean after I done a few blank prints. please help. thanks a lot

[benerin]

Re: Sharp AR-507 blank prints

Hi Guys,

Before do anything, black copy occurs? Black copy many causes, we just trace one by one...

[JustManuals]

Re: Sharp AR-507 blank prints

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[bilyahn]

Re: Sharp AR-507 blank prints

Sounds like the charge unit. Not getting a C1-00? Check your trouble codes in sim 22.

Good luck.

Bil

[thunderzhao]

Re: Sharp AR-507 blank prints

Sounds like the charge unit. Not getting a C1-00? Check your trouble codes in sim 22.

Good luck.

Bil

Thank you Bill!! C1-00 is actually the first one in sim22 trouble history list. could you please hint me what's next to do?

thanks a million

[blackcat4866]

Re: Sharp AR-507 blank prints

I think I'd start by stopping the machine mid-copy, to see if you have a good, developed latent image on the drum. If yes, you have a transfer problem.

If no, back up further to look at developing.
Missing primary charge creates black copies, so the implication here is that the primary charge is present. =^..^=

[thunderzhao]

Re: Sharp AR-507 blank prints

I think I'd start by stopping the machine mid-copy, to see if you have a good, developed latent image on the drum. If yes, you have a transfer problem.

If no, back up further to look at developing.
Missing primary charge creates black copies, so the implication here is that the primary charge is present. =^..^=

Just checked, Drum is quite clean. so it's the developing unit?
Thanks again!!

[blackcat4866]

Re: Sharp AR-507 blank prints

Just because you're not getting a developed image does not necessarily mean the developing unit is faulty.

For example, if there is no drive to the developing unit, there will be no developing. The drive is provided by the main drive pack in the rear of the machine. Or you could be missing the developer bias voltage. Again, no bias-no image. And there could be a problem with the developing unit itself.

When I say "no developing" it means that the toner didn't make it to the drum, for whatever reason. It's up to you now to determine why.
=^..^=

[thunderzhao]

Re: Sharp AR-507 blank prints

Just because you're not getting a developed image does not necessarily mean the developing unit is faulty.

For example, if there is no drive to the developing unit, there will be no developing. The drive is provided by the main drive pack in the rear of the machine. Or you could be missing the developer bias voltage. Again, no bias-no image. And there could be a problem with the developing unit itself.

When I say "no developing" it means that the toner didn't make it to the drum, for whatever reason. It's up to you now to determine why.
=^..^=

Again, thanks a million for your differential diagnosis.
When you say "main drive", does it mean the motor? so I did SIM25-1, to check the operation of the main drive, and get 107. so I guess it's functioning properly. I'm going to check bias voltage at the back of the machine.

[thunderzhao]

Re: Sharp AR-507 blank prints

Back cover is opened. How do I find out if the voltage on main charger is present?

[thunderzhao]

Re: Sharp AR-507 blank prints

those are sim44-9 results:IMG_20111228_101006[1].jpgIMG_20111228_101025[1].jpg

[thunderzhao]

Re: Sharp AR-507 blank prints

Magnetic Roller looks like this when it's taken out, middle portion is not covered by developer. wonder if this is right

IMG_20111228_120403[1].jpg

[thunderzhao]

Re: Sharp AR-507 blank prints

Cleaned the magnetic roller and threw it back for a photocopy, took it out, looks exactly like right after I cleaned it, so the roller is not rolling? why is it not rolling

[blackcat4866]

Re: Sharp AR-507 blank prints

Just because you're not getting a developed image does not necessarily mean the developing unit is faulty.

For example, if there is no drive to the developing unit, there will be no developing. The drive is provided by the main drive pack in the rear of the machine. Or you could be missing the developer bias voltage. Again, no bias-no image. And there could be a problem with the developing unit itself.

When I say "no developing" it means that the toner didn't make it to the drum, for whatever reason. It's up to you now to determine why.
=^..^=

Maybe there's no drive? =^..^=

[thunderzhao]

Re: Sharp AR-507 blank prints

Bill, You are absolutely right, I took out the developer unit, and manually rotated a roller a bit, and there are very faint prints.
I looked around the dev unit, and there's no motor, so I assume the drive is from the back. I wanted to see if it rotates, but when the dev unit is taken out, the copier refuse to move.

So there are 2 possible problems
1. Developer unit is stuck ( I found manually rotating the roller very difficult)
2. the drive to the developer unit is broken.

Bill, how do I find out which one the problem is?