MAINTENANCE
HySpeed HT2000 Instruction Manual 8-7
19
Initial Checks
Before tracking down specific problems, it is good practice to do a visual check, and verify proper voltages are
present at the power source, transformer and power distribution board.
1. Disconnect line power by turning main disconnect switch off.
2. Using a Phillips head screwdriver, remove top plate, two side plates, front plate, and rear plate.
3. Inspect interior of unit for discoloration on pc boards, or other apparent damage. If a component or module
is obviously defective upon visual inspection, remove and replace it before doing any testing. Refer to the
Parts List section (Section 9) to identify parts and part numbers.
4. If no damage is apparent, plug in the power supply unit, and apply power by turning on the main
disconnect switch.
5. Measure the voltage at TB1 between L1, L2 and L3. Refer to Figure 8-1 for detail of TB1. The voltage
between any two of the three points at TB1 should be equal to your supply voltage (200, 208, 220, 240,
380, 415, 480, or 600VAC). If there is a problem at this point, disconnect main power and check
connections, power cable, and fuses at line disconnect switch. Repair and/or replace defective
component(s) if necessary.
For the 220/380/415 – volt CE power supplies, measure the voltage between the U, V and W terminals of
TB1 in the EMI filter located on the top of the power supply. Refer to Appendix E. Also refer to the wiring
diagram in Section 10, if required. The voltage between any two of the three terminals should be equal to
the supply voltage (220, 380 or 415 VAC). If there is a problem at this point, disconnect main power and
check connections, power cable, and fuses at line disconnect switch. Repair and/or replace defective
component(s) if necessary.
WARNING
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.
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