Lexmark C 746 Service Manual

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6.Disconnect the JOPP1 and JFMUSB1 cables (E) from their connectors.
7.Take out the JOPP1, and JFMUSB1 cables (F).E
F 

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8.Raise the top access cover assembly.
9.Push down on the rear-right side of the top cover (G) then pull out the right cover (H) lightly to release the 
top cover from the hinge (I).
IG H 

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10.Slide out the top access cover to remove.
Note:  If you are removing the top access cover assembly to access another FRU, then leave the operator 
panel bezel attached, and you are done. If you are replacing the top access cover assembly FRU, then 
remove the separate operator panel bezel FRU. See “Operator panel bezel removal” on page 4-41
Installation note:  When reinstalling the top access cover assembly, guide the speaker and bin full sensor...

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Top cover assembly removal
1.Remove the fuser. See “Fuser removal” on page 4-110
1.Remove the LVPS. See “Low-voltage power supply (LVPS) removal” on page 4-119.
2.Remove the top access cover assembly. See “Top access cover assembly removal” on page 4-54. 
3.Disconnect the connectors in JBLW1 (A), JFUSER1 (B), JFAN1 (C) on the system board.
Note:  If you are removing the top cover assembly of the C748x model, make sure to remove the speaker 
connector (D)....

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5.Remove the fuser AC cable from the cable restraint (D).
6.Remove the five screws (E).
EE 

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Note:  If you are removing the top cover assembly of the C748x model, remove the two screws (F) to detach the 
speaker mount. The speaker mount is not included as part of the top access cover assembly FRU.
7.Lift and remove the top cover assembly.
Installation note:  Make sure to push down on the cam after reinstalling the top cover assembly.
F 

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Printer removals
5 V interlock switch cable removal
See “5 V interlock switch” on page 7-9 for the part number.
1.Remove the EP drive assembly. See “Electrophotographic (EP) drive assembly removal” on 
page 4-90.
2.Disconnect the connector at JINT1 (A) on the system board. 

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3.Open the front access door cover, and remove the screw (B).
4.Remove the cable from the two cable retainers (C).
B 

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5.Remove the 5 V interlock switch and bracket from the printer.
6.Remove the screw (D), and remove the 5 V interlock switch cable from the bracket.
24 V interlock switch removal
See “24 V interlock switch” on page 7-9 for the part number.
1.Remove the LVPS. See “Low-voltage power supply (LVPS) removal” on page 4-119.
2.Disconnect the connector at JCVR1 (A) at system board. 

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3.Remove the screw (B), and the bracket separates from the 24 V interlock switch.
Installation notes:
Observe the routing of the 24 V interlock switch cable (C).