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4200 Series Troubleshooting Guide
Problem:  
No printer response,
No cooling fan operation,
No power ON LED,
No keyboard beep, and
No homing of printhead carriage.

Probable CauseSolution
EMI filter in fuse assembly open Visually check connections and components for damage.
Loose connections
Open power switch Measure power switch ON/OFF operating resistance [disconnect power cord].
 
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