Lexmark X 850 Owners Manual
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Repair information4-143 7500-XXX Scanner controller card assembly removal 1.Remove the rear upper cover. See “Rear upper cover removal” on page 4-15. 2.Remove the scanner top rear cover. See “Scanner top rear cover removal” on page 4-133. 3.Remove the large platen glass. See “Large platen glass removal” on page 4-142. 4.Gently move the scanner carriage assembly completely to the left to provide access to the screws. 5.Remove the six screws securing the cover (A) to the scanner unit assembly. 6.Move the cover (A) forward then upward in the direction of the arrow. 7.Remove the cover (A). 8.Remove the four card mounting screws (B) securing the scanner controller card assembly (C) from the rear of the scanner unit assembly. 9.Disconnect all connections from the scanner controller card assembly (C). 10.Remove the eleven screws securing the scanner controller card assembly (C) to the scanner unit assembly. 11.Remove the scanner controller card assembly (C). A
4-144MFP Service Manual 7500-XXX B Connectors Connector ConnectorC
Repair information4-145 7500-XXX Small platen glass 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 scanner top rear cover. See “Scanner top rear cover removal” on page 4-133. 6.Remove the screw securing the small platen glass front retainer (A) to the scanner unit assembly. 7.Remove the small platen glass front retainer (A). 8.Remove the screw securing the small platen glass rear retainer (B) to the scanner unit assembly. 9.Remove the small platen glass rear retainer (B). 10.Remove the small platen glass (C). Warning: Do not drop the small platen glass (C), or damage will occur. CAUTION: Avoid touching the underside of the small platen glass (C). Note: Before reinstalling the small platen glass (C), clean the underside of the small platen glass (C) with glass cleaner, then install the small platen glass assembly (C). After installation, clean the top of the small platen glass (C) with glass cleaner. AB C
4-146MFP Service Manual 7500-XXX CCD card/lens assembly removal 1.Remove the large platen glass. See “Large platen glass removal” on page 4-142. 2.Remove the eight screws securing the cover (A) to the scanner unit assembly. 3.Remove the cover (A). 4.Disconnect the connections to the sensor (platen length APS 1) (B) and the sensor (platen length APS 2) (C). 5.Disconnect the CCD ribbon cable assembly (D) from the CCD card/lens assembly (E). Warning: Do not remove or disturb any red painted screws or optical misalignment will occur. 6.Remove the four screws securing the CCD card/lens assembly (E) to the scanner unit assembly. 7.Remove the CCD card/lens assembly (E). Note: Ensure that the white connector is plugged into the sensor (platen length APS 1) (B).
4-148MFP Service Manual 7500-XXX Sensor (platen length APS 1) removal 1.Remove the large platen glass. See “Large platen glass removal” on page 4-142. 2.Remove the eight screws securing the cover (A) to the scanner unit assembly. 3.Remove the cover (A). 4.Disconnect the sensor (platen length APS 1) (B). 5. Remove the screw securing the sensor (platen length APS 1) (B). 6.Remove the sensor (platen length APS 1) (B). Note: Ensure that the blue connector is plugged into the sensor (platen length APS 1) (B).
Repair information4-149 7500-XXX Sensor (platen length APS 2) removal 1.Remove the large platen glass. See “Large platen glass removal” on page 4-142. 2.Remove the eight screws securing the cover (A) to the scanner unit assembly. 3.Remove the cover (A). 4.Disconnect the sensor (platen length APS 2) (B). 5.Remove the screw securing the sensor (platen length APS 2) (B). 6.Remove the sensor (platen length APS 2) (B). Note: Ensure that the white connector is plugged into the sensor (platen length APS 2) (B).
4-150MFP Service Manual 7500-XXX Switch (platen interlock) removal 1.Remove the operator panel assembly. See “Operator panel assembly removal” on page 4-136. 2.Disconnect the connector from the switch (platen interlock) (A). 3.Release the harness of the switch (platen interlock) (A) from the clamp. 4.Remove the screw securing the switch (platen interlock) (A) to the scanner unit assembly. 5.Remove the switch (platen interlock) (A). A Connector Clamp
Repair information4-151 7500-XXX Sensor (scanner HP) removal 1.Remove the scanner top rear cover. See “Scanner top rear cover removal” on page 4-133. 2.Remove the large platen glass. See “Large platen glass removal” on page 4-142. 3.Gently move the scanner carriage (A) rightward to provide access to the sensor (scanner HP) (B). 4.Release the hooks securing the sensor (scanner HP) (B) to the scanner unit assembly. 5.Disconnect the connector from the sensor (scanner HP) (B). 6.Remove the sensor (scanner HP) (B). ConnectorB A
4-152MFP Service Manual 7500-XXX ADF angle actuator 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.Remove the large platen glass. See “Large platen glass removal” on page 4-142. 6.Remove the one screw securing the ADF angle actuator assembly (A) to the scanner unit assembly. 7.Remove the ADF angle actuator assembly (A). A