Chapter 3 — Troubleshooting
30 PB50 and PW50 Forklift Power Supply Installation Guide
If fuses blow sporadically, or power supply shut down occurs
randomly, you may want to use a megohmmeter to check cables
for high-resistance shorts between wires or between a wire and
the cable shield. See the troubleshooting charts starting on page
page 30 for more information.
Substituting Components
Component substitution is the most expedient and certain
troubleshooting technique. It is especially valuable when trying
to resolve intermittent problems.
The disadvantage of substituting components is that you:
• must either have spare parts (power supply and both cables in
this instance).
• be prepared to “borrow” components from another working
installation.
Follow the guidelines in the following troubleshooting charts,
substituting only when directed to do so.
If an installation suffers intermittent input power fuse failures, or
if the power supply shuts down without good cause, do not
hesitate to substitute a known good power supply.
Troubleshooting Charts
The following troubleshooting chart assumes that your portable
printer or other equipment does not work and that the problem
is caused by the power supply or its associated cables. Follow the
procedures in the tables in the order they are shown for
maximum efficiency.
Some of the troubleshooting remedies tell you to reset the power
supply. Use this procedure to reset the power supply.
To reset the power supply
• Disconnect the input power cable for 10 seconds and then
reconnect it.
The power supply has automatic over-voltage, over-current, over-
temperature, and short-circuit protection. If the problem persists,
the LEDs will continue to flicker. Disable input power when
these faults activate that protection.
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