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User Manual
D750
DC Power Supply
Chapter 5 Maintenance
5.1 Introduction
This chapter provides information about maintenance, calibration and trouble shooting.
5.2 Units Under Warranty
Units requiring repair during the warranty period should be returned to a DELTA
authorized service facility. Refer to the addresses listing on the back cover of this manual.
Unauthorized repairs performed by other than the authorized service facilities may void the
warranty.
5.3 Periodic Maintenance
No routine maintenance of the power supply is required except for periodic cleaning. To
clean, disconnect the unit from the AC supply and allow 30sec. for discharging internal
voltage. The front panel and the metal surfaces should be cleaned using mild solution of
detergent and water. The solution should be applied onto a soft cloth, and not directly to the
surface of the unit. Do not use aromatic hydrocarbons or chlorinated solvents for cleaning.
Use low pressure compressed air to blow dust from the unit.
5.4 Adjustments And Calibration
No internal adjustment or calibration is required. There is NO REASON to open the power
supply cover.
5.5 Parts Replacement And Repairs
As repairs are made only by the manufacturer or by authorized service facilities, no parts
replacement information is provided in the manual. In case of failure, unusual or erratic
operation of the unit, contact a DELTA sales or service facility nearest you. Please refer to
the DELTA sales offices addresses listing on the back cover of this user manual.
5.6 Troubleshooting
If the power supply appears to operating improperly, use the troubleshooting guide
to determine whether the power supply, load or external control circuit are the cause.
Configure the power supply for basic front panel operation and perform the tests of section
2.7 to determine if the problem is with the supply.
Table 5-1 provides the basic checks that can be performed to diagnose problems, and
references to sections of this manual for further information.
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