Lexmark X 850 Owners Manual
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Repair information4-153 7500-XXX Sensor (ADF angle) removal 1.Remove the ADF unit assembly. See “ADF unit assembly removal” on page 4-159. 2.Remove the scanner left cover. See “Scanner left cover removal” on page 4-134. 3.Remove the scanner right cover. See “Scanner right cover removal” on page 4-135. 4.Remove the scanner top rear cover. See “Scanner top rear cover removal” on page 4-133. 5.Remove the large platen glass. See “Large platen glass removal” on page 4-142. 6.Remove the ADF angle actuator assembly. See “ADF angle actuator assembly removal” on page 4-152. 7.Release the hooks securing the sensor (ADF angle) (A) to the scanner unit assembly. 8.Disconnect the connector from the sensor (ADF angle) (A). 9.Remove the sensor (ADF angle) (A). ConnectorA
4-154MFP Service Manual 7500-XXX Scanner PS card assembly removal 1.Remove the ADF unit assembly. See “ADF unit assembly removal” on page 4-159. 2.Remove the large platen glass. See “Large platen glass removal” on page 4-142. 3.Remove the CCD card/lens assembly. See “CCD card/lens assembly removal” on page 4-146. 4.Remove all connections from the scanner PS card assembly (A). 5.Remove the three screws securing the bracket (B) to the scanner unit assembly. 6.Remove the bracket (B). 7.Remove the three screws securing the scanner PS card assembly (A) to the bracket (B). 8.Remove the scanner PS card assembly (A). Connector A B
Repair information4-155 7500-XXX Scanner drive motor assembly removal 1.Remove the ADF unit assembly. See “ADF unit assembly removal” on page 4-159. 2.Remove the scanner left cover. See “Scanner left cover removal” on page 4-134. 3.Remove the scanner right cover. See “Scanner right cover removal” on page 4-135. 4.Remove the scanner top rear cover. See “Scanner top rear cover removal” on page 4-133. 5.Disconnect the connector from the scanner drive motor assembly (A). 6.Remove the scanner drive motor tension spring (B) from the scanner drive motor assembly (A). 7.Remove the three screws securing the scanner drive motor assembly (A) to the scanner unit assembly. 8.Remove the scanner drive motor assembly (A). Note: To correctly set the scanner drive belt (C) tension, install the scanner drive motor assembly (A) and the scanner drive motor tension spring (B) before completely tightening the three screws. ACB Connector
4-156MFP Service Manual 7500-XXX Scanner cooling fan removal 1.Remove the ADF unit assembly. See “ADF unit assembly removal” on page 4-159. 2.Remove the scanner left cover. See “Scanner left cover removal” on page 4-134. 3.Remove the scanner right cover. See “Scanner right cover removal” on page 4-135. 4.Remove the scanner top rear cover. See “Scanner top rear cover removal” on page 4-133. 5.Disconnect the connector from the scanner cooling fan (A). 6.Remove the harness from the clamp. 7.Lift the scanner cooling fan (A) upward in the direction of the arrow. 8.Remove the scanner cooling fan (A). Note: Before reinstalling the scanner cooling fan (A), ensure that the label on the scanner cooling fan (A) is facing toward the rear of the scanner unit assembly. Connector Rear Clamp A
Repair information4-157 7500-XXX Exposure lamp PS card assembly removal 1.Remove the large platen glass. See “Large platen glass removal” on page 4-142. 2.Remove the screw securing the exposure lamp PS card assembly (A) to the scanner carriage (B). 3.Move the exposure lamp PS card assembly rearward then release the two hooks securing it to the scanner carriage (B). 4.Remove the exposure lamp PS card assembly (A). 5.Disconnect the exposure lamp (C) from the exposure lamp PS card assembly (A). 6.Disconnect the exposure lamp PS ribbon cable (D) from the exposure lamp PS card assembly (A). 7.Remove the two screws securing the exposure lamp PS card assembly to the insulator bracket (E). 8.Remove the insulator bracket (E). Note: Before reinstalling the exposure lamp PS card assembly (A), ensure that all connections are properly connected. Note: Ensure that all harnesses and cables move freely without binding. Note: Ensure that the exposure lamp PS card assembly is securely mounted to the scanner carriage (B). C DE A B
4-158MFP Service Manual 7500-XXX Exposure lamp removal 1.Remove the large platen glass. See “Large platen glass removal” on page 4-142. 2.Gently move the scanner carriage (A) to the large opening of the frame to provide access to the front side of the exposure lamp (B). 3. Release the hook and disconnect the connector from the exposure lamp (B). 4.Remove the screw securing the exposure lamp to the scanner carriage (A). 5.Pull out the harness of the exposure lamp (B) from the square opening in the scanner carriage. 6.Remove the exposure lamp (B). Warning: Do not touch the glass surface of the exposure lamp, or failure will occur (B). Note: Before reinstalling the exposure lamp (B), ensure that the indexing pin on the end of the exposure lamp (B) is inserted into the hole on the scanner carriage (A). Note: Ensure that the exposure lamp (B) is properly reconnected. B A Connector
Repair information4-159 7500-XXX ADF removals ADF unit assembly removal Warning: The ADF is very heavy; do not drop it, or damage will occur. 1.Remove the platen cushion assembly. See “Platen cushion removal” on page 4-160. 2.Open the ADF to its full upright position. 3.Remove the connection from the ADF to the rear of the scanner unit assembly. 4.Remove the two ADF mounting screws (A). 5.Move the ADF slightly rearward, and then lift upward in the direction of the arrow. 6.Remove the ADF unit assembly. AA A Connectors
4-160MFP Service Manual 7500-XXX Platen cushion removal 1.Open the ADF unit assembly. 2.Gently pull off the platen cushion (A) from the ADF. Note: Before reinstalling the platen cushion (A), position the ADF in its upright position, and place the platen cushion (A) on the large platen glass (B) flush with the left and top edges. Gently close the ADF to attach the platen cushion (A) to the ADF. A A Platen guide 0.5+/-0.2mm 0.5+/-0.2mm
Repair information4-161 7500-XXX Media scan guide removal 1.Open the ADF unit assembly. 2.Remove the screw securing the media scan guide (A) to the ADF unit assembly. 3.Remove the media scan guide (A). 4.Remove the two media scan guide springs (B) from the media scan guide (A). A B
4-162MFP Service Manual 7500-XXX ADF media feed assembly removal 1.Remove the ADF unit assembly. See “ADF unit assembly removal” on page 4-159. 2.Remove the ADF front cover assembly. See “ADF front cover assembly removal” on page 4-166. 3.Remove the ADF rear cover. See “ADF rear cover removal” on page 4-165. 4.Remove the ADF left cover assembly. See “ADF left cover assembly removal” on page 4-168. 5.Remove the document tray assembly. See “Document tray assembly removal” on page 4-164. 6.Disconnect connectors P754, P755, P758, P761, P785, and P786 from the ADF controller card assembly (A). 7.Loosen the set screw securing the damper (B) with an Allen wrench. 8.Remove the damper (B). 9.Disconnect the two connections from the switch (ADF left cover interlock) (D) with needle nose pliers. 10.Disconnect the connector from the document set LED (E). 11.Disconnect the connector from the inverter solenoid assembly (F). 12.Release the harness from the three clamps. 13.Remove the two front screws and the five rear screws securing the ADF media feed assembly (G) to the ADF. 14.Release the two harness from the clamp molded into the base of the ADF. Note: The above clamp is located beneath the ADF registration motor. Do not excessively bend the clamp or it may break. 15.Remove the ADF media feed assembly (G) from the ADF. Note: The plunger in the inverter solenoid assembly (F) will become detached. Note: Before reinstalling the ADF media feed assembly (G), ensure that the harnesses are reinserted into their appropriate clamps. Note: Ensure that the plunger is properly reinserted into the inverter solenoid assembly (F). Note: Ensure that all connections are properly reconnected.