Lexmark X 850 Owners Manual

Repair information4-113
7500-XXX
Dual drive motor assembly removal
1.Remove the rear RIP card cover. See “Rear RIP card cover removal” on page 4-13.
2.Remove the rear motor cover. See “Rear motor cover removal” on page 4-11.
3.Open the printer left door assembly. 
4.Remove the PC cartridge. 
5.Remove the exit 1 drive belt. See “Exit 1 drive belt removal” on page 4-112.
6.Disconnect the two harness connectors from the dual drive motor assembly (A). 
7.Remove the four screws securing the dual drive motor...

4-114MFP Service Manual 7500-XXX
High voltage power supply (HVPS) card removal
1.Remove the printer front left cover. See “Printer front left cover removal” on page 4-3.
2.Remove the top cover assembly. See “Top cover assembly removal” on page 4-5.
3.Remove the PC cartridge. 
4.Remove the printer front door assembly. See “Printer front door assembly removal” on page 4-6.
5.Remove the front inner cover. See “Front inner cover removal” on page 4-8.
6.Disconnect the connector from the HVPS card assembly...

Repair information4-115
7500-XXX
Switch (main power) removal
1.Remove the top cover assembly. See “Top cover assembly removal” on page 4-5.
2.Open the printer front door assembly. 
3.Remove the right upper cover. See “Right upper cover removal” on page 4-9.
4.Remove the screw securing the bracket (A). 
5.Slide the bracket (A) to the side and then upward in the direction of the arrow. 
6.Remove the bracket (A). 
7.Disconnect the four connectors from the switch (main power) (B). 
Note:  Make note of the...

4-116MFP Service Manual 7500-XXX
Exit interface card assembly removal
1.Remove the top cover assembly. See “Top cover assembly removal” on page 4-5.
2.Disconnect all the connectors from the exit interface card assembly (A). 
Note:  Connector P430 has a hook that must first be released. 
3.Remove the two screws securing the exit interface card assembly (A). 
4.Release the plastic supports securing the exit interface card assembly (A). 
5.Remove the exit interface card assembly (A) along with the bracket...

Repair information4-117
7500-XXX
7.Remove the exit 2 card assembly (A). 
Printer engine card assembly removal
1.Remove the rear RIP card cover. See “Rear RIP card cover removal” on page 4-13.
2.Remove the rear motor cover. See “Rear motor cover removal” on page 4-11.
3.Remove the rear lower cover. See “Rear lower cover removal” on page 4-12.
4.Disconnect all the connectors from the engine controller card assembly (A). 
Note:  Connectors P405, P414, P416, and P400 have a hook that must be released....

4-118MFP Service Manual 7500-XXX
6.Remove the printer engine card assembly (A).
Connector
ARear
P418 P407 P406P404
P403P408
P405
P410
P422
P409 P419 P420
P421
P412
P401
P400
P416P413 P417
P414P415
P411 P402 

Repair information4-119
7500-XXX
LVPS card assembly removal
1.Remove the right upper cover. See “Right upper cover removal” on page 4-9.
2.Disconnect the connectors from the LVPS card assembly (A). 
Note:  The connectors P5, P521, P522, and P524 have hooks that must first be released. 
3.Remove the nine screws securing the LVPS card assembly (A) to the printer. 
P523
P522
P524
P521 P221
P5
F002F401 

4-120MFP Service Manual 7500-XXX
4.Remove the LVPS card assembly (A). 
Note:  Grasp the card by the edge; avoid touching the bottom of the LVPS assembly (A). 
A
Right 

Repair information4-121
7500-XXX
LVPS cooling fan removal
1.Remove the right upper cover. See “Right upper cover removal” on page 4-9.
2.Disconnect the connector from the LVPS cooling fan (A).
3.Remove the two screws securing the LVPS cooling fan to the machine.
4.Remove the LVPS cooling fan (A).
Connector A
Right 

4-122MFP Service Manual 7500-XXX
AC drive card assembly removal 
1.Remove the RIP card chassis bracket. See “RIP card chassis bracket removal” on page 4-127.
2.Remove the controller box side cover. See “Controller box side cover removal” on page 4-18.
3.Remove all harnesses from the clamps on the controller cage (A).
4.Remove the six screws securing the controller cage (A) to the printer.
5.Move the controller cage (A) leftward and outward.
6.Remove the controller cage (A).
7.Remove the seven connections...