OKI C3520 MFP User Manual

Maintenance > 101
10.Push the two retaining levers towards the rear of the 
printer to lock the fuser in place.
11. Close the printer top cover and press down firmly so that 
the cover latches closed.
12. Gently  lower the scanner on to its supports.
13. Switch the MFP  ON.
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Maintenance > 102
CLEANING THE LED HEAD
Clean the LED head when printing does not come out clearly, has 
white lines or when text is blurred.
There is no need to turn the printer OFF to clean the lens.
1.Lift the scanner.
2. Press the cover release and open the printer’s top cover 
fully.

Maintenance > 103
3.Gently wipe the LED head surface (1) with LED lens 
cleaner or a soft tissue.
4. Close the printer top cover and press down firmly so that 
the cover latches closed.
5. Gently  lower the scanner on to its supports.
1
CAUTION!
Do not use methyl alcohol or other solvents on the 
LED head as damage to th e lens surface will occur.
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Troubleshooting > 104
TROUBLESHOOTING
CLEARING PAPER JAMS
Provided that you follow the recommendations in this guide on 
use of print media, and you keep the media in good condition 
prior to use, your printer should give years of reliable service. 
However, paper jams occasionally do occur, and this section 
explains how to clear them quickly and simply.
O n e  o f  t h e  m a i n  c a u s e s  o f  p a p e r  j a m s  i s  m e d i a  t h a t  h a s  b e e n  l e f t  
in the cassette tray while the...

Troubleshooting > 105
3.If there is any paper trapped in the feed mechanism.
(a)Lift the feeder mechanism by the coloured tab (2).
(b) Remove any paper from ADF mechanism.
4. Lower the ADF cover (1).
IN THE PRINTER SECTION....
1.If a sheet is well advanced out of the top of the printer, 
simply grip it and pull gently to  draw it fully out. If it does 
not remove easily, do not use excessive force. It can be 
removed from the rear later.
2. Lift the scanner.

Troubleshooting > 106
3.Press the cover release and open the printer’s top cover 
fully.
4. Note the positions of the 4 cartridges.
a
b
WARNING!
If the printer has been po wered on, the fuser may be 
hot. This area is clearly labelled. Do not touch this 
area.
1. Cyan cartridge 2.Magenta cartridge
3. Yellow cartridge 4.Black cartridge
1
2
3
4
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Troubleshooting > 107
It will be necessary to remove the four image drums to 
gain access to the paper path.
5. Holding it by its top centre , lift the cyan image drum, 
complete with its toner cartridge, up and out of the 
printer.
6. Put the cartridge down gently on to a piece of paper to 
contain any toner spillage.
CAUTION!
The green image drum surf ace is very delicate and 
light sensitive. Do not touch it and do not expose it to 
normal room light  for more than 5 minutes. If the 
drum unit needs...

Troubleshooting > 108
7.Repeat this removal procedur e for each of the remaining 
image drum units.
8. Look into the printer to check whether any sheets of paper 
are visible on any part of the belt unit.
9. Remove any sheets of paper as follows: 
>To remove a sheet with its le ading edge at the front of 
the belt (1), carefully lift the sheet from the belt and 
pull it forwards into the internal drum cavity and 
withdraw the sheet.
1
CAUTION!
Do not use any sharp or abrasive objects to separate 
sheets...

Troubleshooting > 109
>To remove a sheet from the central area of the belt, 
carefully separate the sheet from the belt surface and 
withdraw the sheet.
> To remove a sheet just entering the fuser , separate 
the trailing edge of the sheet from the belt, push the 
fuser pressure release lever (1) towards the front and 
down to release the fuser’s grip on the sheet, and 
withdraw the sheet through the drum cavity area. 
Then allow the pressure release lever to rise again.
10. Starting with the cyan image...

Troubleshooting > 110
>Holding the complete assembly by its top centre, lower 
it into place in the printer, locating the pegs at each 
end into their slots in the sides of the printer cavity.
11. Lower the printer top cover but do not press down to latch 
it closed yet. This will protect the drums from excessive 
exposure to room lighting while you check the remaining 
areas for jammed sheets.
12. Open the rear stacker  and check for a sheet of paper in 
the rear path area.
>Pull out any sheets found...