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Most often on the PC940 this means your toner cartridge is getting low on toner. To prove this is the cause, just remove the toner cartridge and while keeping it relatively level, shake it side to side a few times. This will re-distribute the remaining toner in the cartridge. Re-install and make a copy. The black streak/faded copy should be much better. If so then I would go ahead and get a new cartridge on the way.
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Just installed a new cartridge. Made one copy. worked great.
Went to make a copy today. All Black. Thought about it. Tried again and noticed lamp was not lighting. Before you say DUH! is the lamp out or is their extenuating circumstances preventing the lamp from lighting during a copy. The table top moves and everything else seems to work accordingly.
make sure the glass is clean it sounds like you either have a dirty scan glass or the wires need to be cleaned there should be a cleaner on the front cover of the macin that you you pull out and slide back abd fourth to clean it
The waste toner is in the drum unit it's self. If it full you may as well replace the drum unit all togather. Once it is full the drum is just about shoot. If the regestration is off, you may have a problem withe reg. feed clutch. Dose it show up with the paper tray and the manual feed try?
You could have a broken exposure lamp. Does the scan bar light up when you make a copy? If not that is the problem. You might also ck the contacts on the machine where they touch the toner cartridge. The toner cartridge opens a shutter to the drum when you slid it into the machine and that may be broken.