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On this machine for black copies, the areas to check are the HVPS, The ROS, or the Print engin Board.
Most likely on this machine the HVPS can be the problem, then the ROS, then the printe engine board.
The definitions are the scanner platen is under the document feeder, the ROS is the actual laser scanner.
Taking this machine apart several times, one can also check the ground straps to the copy cartridge to make sure they are connecting to copy cartridge when it is inserted into the machine.
Re check all the connections. When taking off the paper feed assay, other parts and plug and jack connections were needed to be taken off first. Make sure the drum seats in its correct position, silver grounds are not bent. The copy cartridge and Dev housing are not connecting very good somewhere. Make sure the machine is unplugged. Try running copies.
In FAX mode, try printing a FAX ACTIVITY REPORT from the FAX OPTIONS MENU. IF the print is OK, your scanner light may be defective, and must be replaced by a technician. If the print is black, the DRUM or something in the DRUM CARTRIDGE has no ground or shorted ground. Remove the DRUM CARTRIDGE and CAREFULLY brush or vacuum any loose toner you can see, and reinstall. DO NOT TOUCH THE DRUM ITSELF! IT WILL BE PERMANENTLY DAMAGED BY EVEN A FINGERPRINT! Otherwise, you may have to replace the DRUM CARTRIDGE. It can be purchased as a supply item.
It sounds like you have lost the ground connection to the drum or housing.
I would suspect if you remove the cartridges and look carefully for the contacts on the cartridges and in the machine you will find either a dirty contact, a spring off, or it is possible a coincidence that one cartrigde failed.
Printing black is caused normally by a loss of ground contact or a high voltage arc.
Check the contacts and make sure everything is seated properly, and replace a cartridge
1. Instead of printing / copying page by page, collate the print...see the options while printing...it will look like 111,222,333 OR 123,123,123 etc.,
2. connect the machine to LAN network by using the LAN module 3. if LAN module is not available, connect a PC to it directly and make it the print controller -> share the printer -> install drivers in other pcs and ..... start printing