COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001CHAPTER 6 TROUBLESHOOTING6-923.3.22 The copy is solid blackScanning lamp1) Is the scanning lamp ON?NO: See “4.1.88 The scanning lamp fails to go ON.”Pre-exposure lamp2) Is the connector of the pre-exposure lamp connected?NO: Connect it.Primary charging assembly3) Make the following selections in service mode:COPIER>DISPLAY>DPOT. Is the reading of ‘VDM’ between 360and 420?NO: Check the primary charging assembly.----------4) Is the connection between the following PCBs normal?1. Image processor PCB2. CCD unit3. DC controller PCB4. Relay PCBNO: Connect them properly.Reader controller PCB, CCD unit5) Does the problem occur only in copy images?NO: Perform the following:1. Replace the reader controller PCB.2. Replace the DC controller PCB.YES: Replace the CCD unit.
