Initial checks
Before troubleshooting, do a visual check and verify that proper voltages are present at the power source, transformers
and power distribution board.
1. Disconnect line power by turning OFF the main disconnect switch.
2. Remove the power supply’s top panel and two side panels.
3. Inspect interior of power supply for discoloration on PC boards, or other apparent damage. If a component or module
is obviously defective, remove and replace it before doing any testing. Refer to the Parts List section to identify parts
and part numbers.
4. If no damage is apparent, connect power to the power supply, and turn the main disconnect switch ON.
5. Measure the voltage between the W, V and U terminals of TB1 located on the right side of the power supply. See
figure on next page. Also refer to the wiring diagram in Section 7, if required. The voltage between any 2 of the 3
terminals should be equal to the supply voltage. If there is a problem at this point, disconnect main power and check
connections, power cable, and fuses at line disconnect switch. Repair or replace any defective component.
DANGER
SHOCK HAZARD: Always use caution when servicing a power supply when plugged in and the covers are
removed. Dangerous voltages exist within the power supply which could cause injury or death.
HPR400XD Manual Gas Instruction Manual 5-29
MAINTENANCE
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