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WARNING
ELECTRIC SHOCK can kill
Have an electrician install and service this
•
equipment
Turn the input power off at the fuse box before
•
working on equipment
Do not touch electrically hot parts
•
Prior to performing preventive maintenance,
•
perform the following capacitor discharge
procedure to avoid electric shock
Sometimes machine failures appear to be due to
PC board failures. These problems can
sometimes be traced to poor electrical
connections. To avoid problems when
troubleshooting and replacing PC boards,
please use the following procedure:
1. Determine to the best of your technical
ability that the PC board is the most likely
component causing the failure symptom.
2. Check for loose connections at the PC
board to assure that the PC board is
properly connected.
3. If the problem persists, replace the
suspect PC board using standard
practices to avoid static electrical damage
and electrical shock.
4. Test the machine to determine if the
failure symptom has been corrected by
the replacement PC board.
NOTE: Allow the machine to heat up so that all
electrical components can reach their
operating temperature.
5. Remove the replacement PC board and
substitute it with the original PC board to
recreate the original problem.
If the original problem does not
•
reappear by substituting the original
board, then the PC board was not the
problem. Continue to look for bad
connections in the control wiring
harness, junction blocks, and terminal
strips.
If the original problem is recreated by
•
the substitution of the original board,
then the PC board was the problem.
Reinstall the replacement PC board
and test the machine.
6. Always indicate that this procedure was
followed when warranty reports are to be
submitted.
NOTE: Following this procedure and writing on
the warranty report, "INSTALLED AND
SWITCHED PC BOARDS TO VERIFY
PROBLEM," will help avoid denial of legitimate PC
board warranty claims.
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