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 machine is in a high humidity 
environment (typically, in an unmanned office over a weekend).
Jams can occur due to paper misfeeding from a paper tray or at 
any point on the paper path through the printer or scanner ADF. 
When a jam occurs, the MFP immediately stops. If printing 
multiple pages (or copies), do not assume that, having cleared 
an obvious sheet, others will not also be stopped somewhere 
along the path. These must also be removed in order to clear the 
jam fully and restore normal operation.
IN THE SCANNER ADF SECTION....
1.Lift the ADF cover (1).
2. Remove any loose paper from the entry to the sheet 
feeder.
1
2
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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 to be out of the printer for longer 
than this, please wrap the cartridge inside a black 
plastic bag to keep it away from light. Never expose 
the drum to direct sunlight or very bright room 
lighting.
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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 from the belt. Th is may damage the belt 
surface.
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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 drum unit nearest the fuser, 
replace the four image drums into the drum cavity, 
making sure to locate them in the correct order.
1
NOTE:
If the sheet is well advanced  into the fuser (only a short 
length is still visible), do not attempt to pull it back. Follow 
step 12 to remove it from the rear of the printer.
1. Cyan cartridge 2. Magenta cartridge
3. Yellow cartridge 4. Black cartridge
1
2
3
4
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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 in this area.
> If the sheet is low down in this area and difficult to 
remove, it is probably still gr ipped by the fuser. In this 
case raise the top cover, reach around and press down 
on the fuser pressure release lever (1).
1
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