TDK 750W HALF RACK technical manual Maintenance

CHAPTER 9 MAINTENANCE

9.1 INTRODUCTION

This Chapter provides information about maintenance, calibration and troubleshooting.

9.2 UNITS UNDER WARRANTY

Units requiring repair during the warranty period should be returned to a TDK-Lambda Americas Inc. authorized service facility. Refer to the addresses listing on the back cover of this User’s Manual. Unauthorized repairs performed by other than the authorized service facilities may void the warranty.

9.3 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 voltages. The front panel and the metal surfaces should be cleaned using a 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 hydocarbons or chlorinated solvents for cleaning. Use low pressure compressed air to blow dust from the unit.

9.4 ADJUSTMENTS AND CALIBRATION

No internal adjustment or calibration is required. There is NO REASON to open the power supply cover.

9.5 PARTS REPLACEMENT AND REPAIRS

As repairs are made only by the manufacturer or by authorized service facilities, no parts re- placement information is provided in the manual. In case of failure, unusual or erratic operation of the unit, contact a TDK-Lambda Americas Inc. sales or service facility nearest you. Please refer to the TDK-Lambda Americas Inc. sales offices addresses listing on the back cover of this User’s Manual.

9.6 TROUBLESHOOTING

If the power supply appears to be operating improperly, use the Troubleshooting Guide (Table 9- 1) 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 3.8 to determine if the problem is with the supply.

Table 9-1 provides the basic checks that can be performed to diagnose problems, with refer- ences to Sections of this User’s Manual for further information.

Table 9-1: Troubleshooting guide

SYMPTOM	CHECK	ACTION	REF
	Is the AC power cord	Check continuity, replace if	3.7
No output. All displays and	defective?	necessary.
indicators are blank.	Is the AC input voltage	Check AC input voltage.	3.6
	within range?	Connect to appropriate	3.7
		voltage source.
Output is present	Does the AC source	Check AC input voltage.	3.6
momentarily but shuts Off	voltage sag when load is	Connect to appropriate
quickly. The display	applied?	voltage source.
indicates “AC”.

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