4200 Series Troubleshooting Guide
Problem:  
Printhead carriage motor doesn't run

Probable CauseSolution
Cabling problems Check for loose carriage motor assembly cabling.
+HV failure, may be no message displayed. Also, paper will not feed. See Power Supply Checks, "Problem: Printhead Carriage Fails to Home"
Motor failure or motor driver failure likely if paper feed functions. See "Motor Failures"
EPROM/MPU failure Replace daughter board
 
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