OKI C3400N User Manual

C3400n User’s Guide
91
     unlock belt_F5_08.jpg  
5.Turn the two fasteners (1) 90° to the left. This will release the 
belt from the printer chassis.
6.Pull the lifting bar (2) upwards so that belt tilts up towards the 
front, and withdraw the belt unit from the printer.
    belt coming out_Fig1_33.jpg  
7.Lower the new belt unit into place, with the lifting bar at the front 
and the drive gear towards the rear of the printer. Locate the 
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C3400n User’s Guide
92 drive gear into the gear inside the printer by the rear left corner 
of the unit, and lower the belt unit flat inside the printer.
   belt_roll in _ F5_09.jpg   
8.Turn the two fasteners (1) 90° to the right until they lock. This 
will secure the belt unit in place.
      belt_lock_F5_09_1.jpg 
9.Replace the 4 image drums, complete with their toner cartridges, 
into the printer in the correct positions as shown.
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C3400n User’s Guide
93
      ID Positions_Fig1_04.jpg  
     
10.Finally, close the top cover and press down firmly at both sides so 
that the cover latches closed.
1. Cyan cartridge 2. Magenta cartridge
3. Yellow cartridge 4. Black cartridge
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C3400n User’s Guide
94
Cleaning the LED head
Clean the LED head when printing does not come out clearly, has 
white lines or when text is blurred.
1.Switch off the printer and open the top cover.
2.Gently wipe the LED head surface (1) with LED lens cleaner or 
soft tissue.
       Cleaning LED Head_F5_04.jpg  
     
3.Close the top cover.
CAUTION!
Do not use methyl alcohol or other solvents on the LED 
head as damage to the lens surface will occur.
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C3400n User’s Guide
95
Installing additional memory 
This section explains how to install additional RAM memory 
into your printer as a memory upgrade. 
Part Numbers
See “Part Numbers” on page 75.
Memory upgrade
The basic printer model comes equipped with 32MB of main 
memory. This can be upgraded with an additional memory 
board containing 64MB or 256MB, giving a maximum total 
memory capacity of 288MB.
Installation takes a few minutes, and requires a medium size 
cross-head (Philips type) screwdriver....

C3400n User’s Guide
96 3.Remove each image drum units, starting with the front. Cover 
the image drum units to protect them from direct light
    IDs _ all out_cover_F8_19.jpg  
4.Locate the two fasteners (1) at each side of the belt (3) and the 
lifting bar (2) at the front end.
     unlock belt_F5_08.jpg  
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C3400n User’s Guide
97 5.Unlock the fasteners and remove the belt as shown.
       belt coming out_Fig1_33.jpg   
6.Carefully remove the new memory board from its wrapping. Try 
to handle the board only by its short edges, avoiding contact with 
any metal parts as far as possible. In particular, avoid touching 
the edge connector.
7.Notice that the memory board has a small cutout in the edge 
connector, which is closer to one end than the other.
     Memory card_Fig1_30.jpg  
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C3400n User’s Guide
98 8.Identify the RAM expansion slot  in the printer. Unclip the plastic 
cover to open this slot.
        Memory slot_Fig1_34.jpg  
9.If the RAM expansion slot already contains a memory upgrade 
board, that board will have to be removed before you can install 
the new one. To remove it proceed as follows, otherwise skip to 
step 10.
(a)Identify the locking clips at each end of the RAM expansion 
slot.
(b)Push the clips outward and back into the printer. The board 
will pop out...

C3400n User’s Guide
99 11.Gently push the board into the RAM expansion slot until it latches 
in and will not go any further.
      Memory card In_Fig1_35.jpg   
12.Close the RAM expansion slot.
13.Replace the belt and image drum units.
See “Image drum replacement” on page 82.
See “Replacing the belt unit” on page 89.
14.Close the top cover of the printer.
15.Reconnect the AC power cable and switch the printer on.
16.When the printer is ready, print a menu map by holding down the 
ON LINE button on the...

C3400n User’s Guide
100
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.
Jams can occur due to paper misfeeding from a paper tray or at any 
point on the paper path through the printer. When a jam occurs, the 
printer...