Lexmark X 850 Owners Manual
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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 assembly (A) to the printer. 8.Remove the dual drive motor assembly (A). Warning: Depress the spring loaded gear (C) while removing the dual drive motor assembly (A) to prevent damage. Warning: Before reinstalling, depress the spring loaded gear (C) while replacing the dual drive motor assembly (A) to prevent damage. A C Rear Connector Connector
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 (A). 7.Release the harness from the clamps. 8.Remove the two screws securing the HVPS card assembly (A). 9.Remove the HVPS card assembly (A) by sliding it outward in the direction of the arrow. Note: Before reinstalling, ensure the HVPS (A) is inserted into the side slots properly. Clamp A ClampFrontConnector
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 proper location of the four connectors. 8.Release the hooks securing the switch (main power) (B) to the bracket (A). 9.Remove the switch (main power) (B). Note: Before reinstalling, ensure the four connectors are plugged into their proper location to prevent damage. Hook Hook FrontNotch ConnectorsAB
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 (B). 6.Remove the two screws securing the exit interface card assembly (A) to the bracket (B). ConnectorPlastic support Connector A B Front
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. 5.Remove the six screws securing the printer engine card assembly (A). P431P430P432P434P433 A
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 to the AC drive card assembly (B). 8.Remove the six screws securing the AC drive card assembly (B) to the printer. Note: Connectors P1, P4, P6, and P7 have a hook that must be released. Clamp A RearClamp