[CQ] intermittent dark background

[dawn]

Anybody encounter this problem?

Model: Dsm 615

Problem: Intermittent dark background when copying in platen glass. Printing and in df copying all is okey.I am sure its in optics problem but which specific parts in optics unit maybe a problem?

Thanks

[tonnerboy]

Did you try make a scanner free run?
Maybe you find something abnormal

[rsyarcia]

start with cleaning the mirrors first.