Oki B721dn User manual

B721DN Right Side Paper Tray Guide
Replacement
The symptoms are constant paper jams or the paper tray will not lock in place or will pop out.
If you have to replace the Right Side Paper Tray Guide due to breakage, you should order Oki Data Part
Number: 45373501, which is the entire right side frame assembly as shown below:
Rather than removing and replace the entire right side frame, you can remove the Right Side Paper Tray
Guide by removing the 2 screws highlighted above and performing the procedure on the next pages for
replacement of the right side paper tray guide on a customer’s machine.
Screws are indicated by Red callouts
Tabs are indicated by Blue callouts
Cables / Connectors are indicated by Green callouts
NOTE:

Step
Procedure
Photo
1
a.) Unplug the B721DN power cord from the wall.
b.) Remove the Paper Cassette from the printer
c.) Open the front and top cover and remove the Drum and Toner assembly.
2 Remove 3 screws from the upper right side
cover.
3 Remove 1 screw from the right side lower
cover.
4 Remove 2 screws from the rear cover.
5
Gently pull the rear cover away from the
printer. NOTE: The rear cover has 2 tabs
along the left and right edge at the top.

6 Open the rear paper path door
7
There are 3 tabs holding the right side cover
at the rear of the printer. Gently release all
3 tabs as described below:
2 of them are shown at right.
8 The third tab is located above the straight
through paper path door.
9
At the front of the printer, on the right
cover, there are 4 tabs to gently lift away
from the printer frame.
One at the lower right corner of the right
side.

10
Three along the upper side of the right
cover
Now, gently lift and remove the right side
cover from the printer.
11
There are 8 screws on the metal shield plate
to be removed.
1 on the top of the shield
2 on the rear of the shield
5 on the face of the shield
12
At the front of the metal shield, gently lift
the shield over the locator pin.
There are several additional locator pins at
the top of the shield that you should lift the
shield over.
13 Lift the metal shield and remove it from the
printer.

14
Remove three Power Connectors (Green
boxes) and 4 Screws from the Low Voltage
Power Supply.
Remove the Low Voltage Power Supply.
15 Remove the black plastic shield that is
behind the Low Voltage Power Supply
16
Gently unplug the Ribbon Cables (Green
boxes) from the printer’s logic board and
carefully unthread the ribbon cable through
the printer.
17
Gently unplug the purple 2 wire cable
(Green box) connector from the printer and
unthread it through the printer.
18 NOTE: You may find it easier to remove the front fan by removing the 2 screws securing it to
the chassis when unthreading the ribbon and 2 wire connector from the printer.

19
Gently unplug the wire connector from the
2nd paper tray connector in the bottom of
the frame
20 Unplug the red 2 wire connector
21
Remove the screw securing the grounding
wire from the front tray to the printer
chassis and unthread the grounding wire.
22
Remove the screw securing the bottom
frame bracket on the right side of the
printer.

24
Remove the screw from the right Front
Cover Stay and disconnect the right hinge
arm.
25
Remove the 3 screws from the right Front
Hinge assembly and remove the hinge
assembly. The right side of the front cover is
not disconnected from the right side
cassette tray guide. Carefully unthread the
wires from the frame to the front cover.
26 Close the Top Cover and the Front Cover, being careful not to pinch any of the cables at the
front cover.
27
Gently flip the printer on its right side and
remove 2 screws from the 2nd paper tray
connector and remove the connector.
28 Remove 2 recessed screws from the right
side cassette tray guide

29 Remove the bottom frame bracket from the
right side cassette guide.
30 Remove the right side cassette guide.
31
Reassemble the printer by following the disassembly guide in reverse.
CAUTION: Rethread the cables in Steps 16, 17, 20 & 24 as they were originally threaded.