Intermec PB51 Forklift Power Supply Installation Guide - Page 37

Chapter 3 - Troubleshooting 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. For more information, see "Troubleshooting Charts" on page 27. 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. Forklift Power Supply Installation Guide 27