Lexmark X 850 Owners Manual
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Repair information4-133 7500-XXX Scanner top rear cover removal 1.Remove the ADF unit assembly. See “ADF unit assembly removal” on page 4-159. 2.Remove the rear upper cover. See “Rear upper cover removal” on page 4-15. 3.Remove the scanner left cover. See “Scanner left cover removal” on page 4-134. 4.Remove the scanner right cover. See “Scanner right cover removal” on page 4-135. 5.Remove the three screws securing the scanner top rear cover (A) to the scanner unit assembly. 6.Lift the scanner top rear cover (A) upward. 7.Remove the scanner top rear cover (A). A
4-134MFP Service Manual 7500-XXX Scanner left cover removal 1.Remove the two screws securing the scanner left cover (A) to the scanner unit assembly. 2.Disengage the rear side of scanner left cover (A) from the scanner unit assembly, and shift the scanner left cover (A) rearward. 3.Release the two hooks securing the front side of scanner left cover (A), and remove the scanner left cover (A). A
Repair information4-135 7500-XXX Scanner right cover removal 1.Remove the two screws securing the scanner right cover (A) to the scanner unit assembly. 2.Disengage the rear side of scanner right cover (A) from the scanner unit assembly, and shift the scanner right cover (A) rearward. 3.Release the two hooks securing the front side of the scanner right cover (A), and remove the scanner right cover (A). A
4-136MFP Service Manual 7500-XXX Operator panel assembly removal Warning: In the event of replacement of any one of the following components: •Operator panel assembly (universal) •Operator panel controller card assembly •RIP card assembly •Interconnect card assembly Only replace one component at a time. Replace the required component, and perform a POR before replacing a second component listed above. If this procedure is not followed, the printer will be rendered inoperable. Never replace two or more of the components listed above without a POR after installing each one, or the printer will be rendered inoperable. Warning: Never install and remove components listed above as a method of troubleshooting components. Once a component has been installed in a machine, it cannot be used in another machine. It must be returned to the manufacturer. 1.Remove the four screws securing the operator panel assembly (A) to the scanner unit assembly. 2.Move the operator panel assembly (A) forward. 3.Disconnect the two connectors from the operator panel assembly (A). 4.Remove the operator panel assembly (A). Warning: Do not drop the operator panel assembly (A), or damage will occur. Connectors A
Repair information4-137 7500-XXX USB connector removal 1.Remove the one screw securing the USB connector housing (A) to the operator panel assembly (B). 2.Pull the USB connector housing (A) from the operator panel assembly (B). 3.Remove the connector from the USB connector (C). 4.Remove the USB connector (C) from the USB connector housing (A). Operator panel user touch screen removal 1.Remove the operator panel assembly. Go to “Operator panel assembly removal” on page 4-136. 2.Remove one screw securing the ground wires (A) to the rear of the operator panel assembly (B). 3.Remove the six screws securing the bottom cover (C) to the operator panel assembly (B). 4.Remove the bottom cover (C) from the operator panel assembly (B). Warning: Be careful when removing ribbon connections to avoid damage. 5.Remove the three connections from the operator panel user touch screen (D). 6.Remove the two screws securing the bezel (E) to the operator panel assembly (B). 7.Remove the bezel (E). 8.Remove the four screws securing the operator panel user touch screen (D) to the operator panel assembly (B). A BC AConnector
4-138MFP Service Manual 7500-XXX 9.Remove the operator panel user touch screen (D). Note: Before reinstalling the operator panel user touch screen (D), ensure that all connections are properly replaced. Note: Before reinstalling the operator panel assembly (B), ensure that all ground wires (A) are properly replaced. Connectors E D D B E C A B A
Repair information4-139 7500-XXX Operator panel controller card assembly removal 1.Remove the operator panel assembly. Go to “Operator panel assembly removal” on page 4-136. 2.Remove one screw securing the ground wires (A) to the rear of the operator panel assembly (B). 3.Remove the six screws securing the bottom cover (C) to the operator panel assembly (B). 4.Remove the bottom cover (C) from the operator panel assembly (B). Warning: Be careful when removing ribbon connections to avoid damage. 5.Remove the three connections from the operator panel controller card assembly (D). 6.Remove the four screws securing the operator panel controller card assembly (D) to the operator panel assembly (B). 7.Remove the ground wire (A). 8.Remove the operator panel controller card assembly (D). Note: Before reinstalling the operator panel controller card assembly (D), ensure that all connections are properly replaced. Note: Before reinstalling the operator panel assembly (B), ensure that all ground wires (A) are properly replaced.175 Connectors B DA C A B
4-140MFP Service Manual 7500-XXX Operator panel inverter card assembly removal 1.Remove the USB connector. Go to “USB connector removal” on page 4-137. 2.Remove the operator assembly. Go to “Operator panel assembly removal” on page 4-136. 3.Remove one screw securing the ground wires (A) to the rear of the operator panel assembly (B). 4.Remove the six screws securing the bottom cover (C) the operator panel assembly (B). 5.Remove the bottom cover (C) from the operator panel assembly (B). 6.Remove the two connections from the operator inverter card assembly (D). 7.Remove the four screws securing the operator inverter card assembly (D) to the operator panel assembly (B). 8.Remove the operator panel inverter card assembly (D). Note: Before reinstalling the operator panel inverter card assembly (D), ensure that all connections are properly replaced. Note: Before reinstalling the operator panel assembly (B), ensure all ground wires (A) are properly replaced. Connector B D Connector C A B
Repair information4-141 7500-XXX Scanner unit assembly removal 1.Remove the ADF unit assembly. See “ADF unit assembly removal” on page 4-159. 2.Remove the operator panel assembly. See “Operator panel assembly removal” on page 4-136. 3.Remove the scanner left cover. See “Scanner left cover removal” on page 4-134. 4.Remove the scanner right cover. See “Scanner right cover removal” on page 4-135. 5.Remove the rear upper cover. See “Rear upper cover removal” on page 4-15. 6.Remove the scanner top rear cover. See “Scanner top rear cover removal” on page 4-133. 7.Remove the two power connections from the rear of the scanner unit assembly (A). 8.Remove the six screws securing the scanner unit assembly (A) to the machine. 9.Remove the scanner unit assembly (A). Front A Rear A Connectors
4-142MFP Service Manual 7500-XXX Large platen glass removal 1.Remove the two screws securing the large platen glass retainer (A) to the scanner unit assembly. 2.Remove the large platen glass retainer (A). 3.Gently lift the large platen glass (B) upward, and move it rightward in the direction of the arrow. 4.Remove the large platen glass (B). Warning: Do not drop the large platen glass (B), or damage will occur. CAUTION: Avoid touching the underside of the large platen glass (B). Note: Before reinstalling the large platen glass (B), clean the underside with glass cleaner, and then install the large platen glass assembly (B). After installation, clean the top of the large platen glass (B) with glass cleaner. A B