That's a good place to start. Disable Potential control in service mode.
COPIER > OPTION > BODY
PO-CNT
Then see what you get running a copy. If copies are still black I would suspect a laser issue of some sort. If copies are ok - check or replace potential control pcb. Could also be related to corona or hvt but I doubt it. I'm leaning toward the laser as your trouble.
Anything can be made to work if you fiddle with it long enough- San Diego Copier Repair.com
If you go into service mode Copier>Display>DPOT and see what VLT is reading (normally around 65~70 volts).
Next check VLM and what that reading is (this should be close to VLT).
If VLM is much higher than VLT ( such as VLM= 200 or 300) the Laser Scanner power is to weak, and could not bring the voltage down to correct target.
Canon Copier Repair Service. Sales, Parts & Toner. NYC/NJ area. Contact:East Coast Imaging Solutions,LLC
Its a weird case but won't hurt to check.
Tray 1 Vertical feed clutch CL8 had metal shavings around it, causing electrical feedback to the machine.
Cleaning up the area and replacing CL8 resolved the black copies.
Canon Copier Repair Service. Sales, Parts & Toner. NYC/NJ area. Contact:East Coast Imaging Solutions,LLC
It is new
olso prints
VLT AND VLM IS AROUND 30
Last edited by blazebusiness; 10-28-2010 at 03:30 PM.
Anything can be made to work if you fiddle with it long enough- San Diego Copier Repair.com
Bookmarks