Lexmark C 746 Service Manual

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Contact springs kit removal
See page 7-13 for the part number.
Toner cartridge contacts removal
1.
Remove the LVPS. See “Low-voltage power supply (LVPS) removal” on page 4-119.
2.Remove the printhead. See “Printhead removal, installation, and adjustment” on page 4-145.
3.Remove contact spring cables from the cable restraints (A). 
Note:  Pay attention to the routing of the cartridge contact cables, and the appropriate slots where each 
cartridge contact is installed.
A 
						

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4.Remove the three screws (B) securing the top three bell crank links.
5.Remove the bell crank link (C) together with its bell crank spring (D).
B
CD 
						

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Installation notes:
a.When installing the bell crank link and spring back to the machine, guide the mounting hole on the 
bell crank link to the mounting pin on the cartridge guide (E), and guide one end of the spring onto the 
boss rest on the bell crank link and the other end onto the boss rest on the bell crank (F).
b.Make sure the locator pin on the bell crank rests on the locator hole of the bell crank link (G).
6.Use a prying tool to remove the bell crank.
Note:  The bell crank must be replaced due to the damage that can occur to the retention features of this 
bell crank.
7.Perform steps 5 and 6 to the other bell crank links and bell cranks, except for the one found at the lower-
most portion of the cartridge guide.
F FEG 
						

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8.Remove the lower-most bell crank spring (H) and bell crank (I).
9.Using a spring compression tool (J), align its opening to the rib on the cartridge guide as shown, then push 
and hold the spring compression tool into the cartridge contact spring.
Note:  Make sure to properly align the opening on the spring compression tool to the rib on the cartridge 
guide.
HI
J 
						

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10.Remove the cartridge contacts from the right side of the machine, then release the spring compression 
tool.
Note:  Pay attention to the color coding of the cartridge contact cables, and the appropriate slots where 
each cartridge contact is installed.
Installation notes:
a.Insert the cartridge contact spring into the slot on the cartridge guide.
12 
						

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b.Position the spring compression tool (K) as shown below and align its opening to the rib on the 
cartridge guide, then push and hold the spring compression tool into the cartridge contact spring.
Note:  Make sure to properly align the opening on the spring compression tool to the rib on the 
cartridge guide.
c.Insert the cartridge contact on the right side of the machine.
11.Perform steps 9 and10 to remove all the cartridge contacts.
K
1
2 
						

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Charge roll contact spring removal
1.
Remove the HVPS. See “High-voltage power supply (HVPS) removal” on page 4-115.
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 4-115.
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.
Open the front access door and 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