CHAPTER 10 TROUBLESHOOTINGCOPYRIGHT © 1999 CANON INC. CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 10-27C. Troubleshooting of Image Faults1. Light image (halftone areas only)CauseAE adjust-mentBlack devel-oping assem-blyLens, Dust-proofing glassPhotosensitivedrumActionEnd.Perform AE adjustment.Check that J39-1 andJ39-4 of the black devel-oping assembly are con-nected by a jumper wire.If they are not, connectthem.End.Replace the drum unit.YES/NOYESYESYESYESNOChecksDoes the image quality improve after theBasic Adjustment Procedure is followed?Is the image lighter when a copy is madeusing AE?Is the image lighter when a copy is madeusing a black developing assembly?Is the image quality improved after thelens, dust proofing glass, and mirror arecleaned?Step1234
