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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 listed 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 30 seconds for discharging internal voltage. 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 hydrocarbons 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 replacement
information is provided in the User's 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 TDK- Lambda Americas Inc (Programmable & High Voltage) website:
http://www.us.tdk-lambda.com/hp/
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 references to sections of
this User's Manual for further information.
SYMPTOM
No output. All displays and
indicators are blank.
Output is present
momentarily but shuts Off
quickly. The display
indicates "AC".
Output is present
momentarily but shuts off
quickly.The display
indicates "OUP".
Output Voltage will not
adjust. Front panel CC LED
is illuminated.
Table 9-1: Troubleshooting Guide
CHECK
Is the AC power cord
defective ?
Is the AC input voltage
within range ?
Does the AC source
voltage sag when load is
applied ?
Is the power supply
configured to Remote
sense ?
Is the unit in Constant-
Current (CC) mode ?
76
83-517-000 Rev. A
ACTION
Check continuity, replace
cord if necessary.
Check AC input voltage.
Connect to appropriate
voltage source.
Check AC input voltage.
Connect to appropriate
voltage source.
Check if the positive or
negative load wire is
loose.
Check Output current limit
setting and load current.
REF
3.7
3.6
3.7
3.6
3.9.6
3.9.8
5.2.1
5.2.2
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