C3100 Scanner carriage problem
• The home position is not correct when the power is turned on or copying the document placed on the contact glass.
Poor contact of the connector terminals.
Defective scanner home position switch.
Defective engine PCB.
Defective scanner motor.
This copier may need a service adjustment. The problem could be something as simple as a switch not being in home position. Please troubleshoot accordingly. Unplug device when troubleshooting.You should also troubleshoot it by looking to see if anything is blocking or stuck causing the carriage to not go into position.
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A yellow screw is on the back of the unit, you must open it.Thus, the scanner unit is released
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