I would check the scanner slit glass under the toner cartridge. Clean the optics, pull the PCU out and clean the LED erase lamps. After this I would say it was the PCU. I NEVER would mess with the exposure baffles or the focus.
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1st the basic cause of dark/grey copies DUST. Clean w/ alcohol cloth then dry cloth totally all mirrors and the platen glass both side. If still dark check the "Optic slit " right in the upper of your halogen lamp remove it, still dark Check your halogen lamp maybe it already oxidized. The last solution adjust the CVR .
Does this happen when copying off of the glass? No? Clean the slit glass on the left. Still does it? Turn off the copier, remove the slit glass and the original glass. Gently slide the mirror carriage to the right. Carefully wipe the mirrors with a microfiber cloth and with a can air blow around the exposure lamp area. Reassemble and test. The most common problem is gunk on that slit glass which is easily remedied using a microfiber cloth.
does the lamp under the platen glass turns on when copying? if not you might need a new exposure lamp...but if you get an image but its very dark, if you are mechanically inclined you can clean the mirrors and lens and the bottom of the platen glass because after many years of use dust will make the optics dirty and cause the copies to be very dark. hope this helps.
This is going to be a user program:
1) press and hold both light and dark keys
a) the 2 buttons to lighten and darken copies
b) hold both for 5 sec until indicators light up
2) use the left copy quantity key show 2
3) press your copy key
4) use the right quantity key to change to 2 (max 90 sec)
5) press the copy key
repeat step 2 but change to 3 with left quantity key
press the copy key
change right number to (4 = 60 min, 1 is default at 5 min) then press your copy key.
Once done press both light and dark key again to exit
Note*** changing shut off timer and preheat will effect copy lamp ready state. Every 60 sec or so the scanner will move and reset. Some people do not like the noise is makes all the time. If you don't you can always change it back to the defaults. 2=0 and 3=1.
The type of printer you have reads the image you want to copy by passing the paper in front of a image reader (it is like a wand with a light-slit on a side).
If someone passed in front of this reader a paper with something like dirt on it (or typing corrector not dry enough) some of that could stick ON the light-slit, so that the section covered with it cannot read any more the image you want to copy at that point!
Try to make a copy and look from above or aside where that light-wand is located, then try to clean it with a clean hanky. It could involve some technikal skills, maybe you have to loose some screws to get to it.
If dirt stick on it after this, try with some alcohol (no solvent please!). After cleaning the reader, copies should come out ok, please let me know.