TechNote  40T-047

4400  Series

Premature Board Failures on either the SMMC or SMHI boards.
04-20-95 Rich Van Breemen

Models: 4410 / 4440; 4470 / 4490

Summary:
 SYMPTOM: Symptoms may vary from failure of the stepper motors to function, shuttle motor failures or machine faults reported during power on self test..

CAUSE: Not waiting until the power supply capacitors are fully discharged before removing or installing logic boards will cause the circuits on either the SMMC or SMHI to fail.

Resolution:
 


ACTION:  Ensure that you wait at least one full minute before removing or installing
 any logic board(s) in the 44XX series of shuttle matrix printers.

Specifications subject to change without notice.
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