Thanks: 
Likes: 
Dislikes: The machine is not working as a printer (copier only ) .
Issue is from glass copies.
And I think it has nothing with the reader unit as it appears in the middle of a multi copies job with single scan .
The machine is not working as a printer (copier only ) .
Issue is from glass copies.
And I think it has nothing with the reader unit as it appears in the middle of a multi copies job with single scan .
I'm thinking you have either a drum ground issue or primary charge issue. The sample you have has been written by the laser.
1) To check the drum ground: Measure the resistance from the metal edge of the drum surface to the frame ground. You should consistently get very close to 0 ohms. If not, you need to find where that connection is lost.
2) If you replaced the drum unit, it came with a new primary charge. That leaves either charge contacts or the HVT. In my Canon days I replaced only one HVT ever, on any Canon, so I would focus on charge contacts.
On a side note, I would apply some conductive grease to the registration roller ground.
Good luck. =^..^=
If you'd like a serious answer to your request:
1) demonstrate that you've read the manual
2) demonstrate that you made some attempt to fix it.
3) if you're going to ask about jams include the jam code.
4) if you're going to ask about an error code include the error code.
5) You are the person onsite. Only you can make observations.
blackcat: Master Of The Obvious =^..^=
Thank you all guys , Problem solved . There was a broken part in the HV pcb .
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