Lexmark X 850 Owners Manual

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...

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...

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...

Repair information4-147
7500-XXX
E
D Connector 

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...

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...