Lexmark C736 Service Manual

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5.Engage the gears (D) on the right side of the COD.
6.Replace the five screws (E).
7.Verify the actuators can be seen by looking inside the printer at the triangular holes, as in step 2.
8.Check to make sure you can rotate the large COD gear from stop to stop.
9.Reconnect the cable connector to JBOR1 connector on the system board.
10.Reinstall the top cover assembly, the fuser, and the covers. 

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Contact springs kit removal
See “Contact springs kit, including:” on page 7-11 for the part number.
Charge roll contact spring removal
1.
Remove the HVPS. See “High-voltage power supply (HVPS) removal” on page 4-108.
2.Remove the charge roll contact springs (A). Be sure to push the springs under the retainers that hold them 
in place.
Installation note:  Make sure the springs are behind the retainers when installing the new springs.
A
Retainer 

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HVPS contact springs removal
1.
Remove the HVPS. See “High-voltage power supply (HVPS) removal” on page 4-108.
2.Pull out the spring that will be replaced:
•HVPS DB contact spring (A)
•HVPS DR contact spring (B)
•HVPS TAR contact spring (C)
Installation note:  Refer below for the location of the HVPS DR Contact spring and HVPS DB contact 
spring.
C
AB
27S1997 HVPS DR Contact
27S1998 HVPS DB Contact 

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Torsion spring removal
1.
Remove all the toner cartridges.
2.Remove the screw (A) and the spring cap (B) of the appropriate contact spring.
3.Press the lower half (C, D) of the springs, and remove the springs.
B A
D C 

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Installation notes: 
•When installing, make sure the top half (E) of the spring is under the straight spring (F). This is typical for 
both types of springs. Also make sure the bottom half (D,G) of both springs are compressed and locked by 
the appropriate locking tabs (H, I).
GFE
H
DI 

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Cooling fan removal
1.Remove the rear upper cover. See “Rear upper cover removal” on page 4-36.
2.Remove the rear frame cover. See “Rear frame cover removal” on page 4-33. 
3.Disconnect JFAN1 (A).
4.Remove the two screws (B).
5.Remove the cooling fan.
B 

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Cooling fan filter removal
1.Remove the rear upper cover. See “Rear upper cover removal” on page 4-36.
2.Turn the cover over.
3.Squeeze the right side of the filter, and remove it from the tabs (A). 

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Display detent spring
1.Remove the top access cover assembly. See “Top access cover assembly removal” on page 4-40.
2.Turn the top access cover assembly over.
3.Remove the nine screws (A) securing the position guide.
4.Remove the four screws (B) from the operator panel card.
Note the position of the ground cable (C). 

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5.Disconnect the operator panel cable (D).
6.Gently turn the operator panel card over, and disconnect both display cables (E).
Note:  The ribbon cable has a latch (F) that needs to be lifted to disconnect the cable.
7.Turn the top access cover assembly over.
8.Remove the operator panel bezel. See “Operator panel bezel removal” on page 4-28. 
D 

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9.Remove the screw (G) securing the display detent spring.
10.Rotate the display detent spring (H), and push down to remove the spring.
G