Service Manual UDP6900 Series Digital Control Power Supply
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Before servicing this product, read the General Safety Summary and the Service Safety Summary at the
front of the manual, as well as the following ESD information.
Caution: Electrostatic discharge (ESD) can damage any semiconductor component in this
instrument. When performing any service that requires internal access to the instrument, adhere to
the following precautions to avoid damaging internal modules and their components due to
electrostatic discharge.
1. Minimize handling of static-sensitive circuit boards and components.
2. Transport and store static-sensitive modules in their static protected containers or on a metal rail.
Label any package that contains static-sensitive boards.
3. Discharge the static voltage from your body by wearing a grounded antistatic wrist strap while
handling these modules.
4. Service static-sensitive modules only at a static-free work station.
5. Do not allow any items capable of generating or holding a static charge on the work station surface.
6. Handle circuit boards by the edges when possible.
7. Do not slide the circuit boards over any surface.
8. Avoid handling circuit boards in areas that have a floor or work-surface covering capable of generating
a static charge.
Inspection and Cleaning
Inspection and cleaning describes how to inspect for dirt and damage. It also describes how to clean the
exterior and interior of the instrument. Inspection and cleaning are the preventive maintenance. Regularly
preventive maintenance can prevent malfunction and enhance its reliability.
Preventive maintenance consists of visually inspecting and cleaning the instrument and using general care
when operating it.
The frequency of performing maintenance depends on the severity of the environment in which the
instrument is used. The appropriate time to perform preventive maintenance is before the instrument is
adjusted.
Exterior Cleaning
Clean the exterior surfaces of the chassis with a dry lint-free cloth or a soft-bristle brush. If any dirt
remains, use a cloth or swab dipped in a 75% isopropyl alcohol solution. Use a swab to clean narrow spaces
around controls and connectors. Do not use abrasive compounds on any part of the chassis that may
damage the chassis.
Caution： Avoid the use of chemical cleaning agents which might damage the plastics used in this
instrument.
Use only deionized water when cleaning the front-panel buttons. Use a 75% isopropyl
alcohol solution as a cleaner for cabinet parts. Before using any other type of cleaner,
consult UNI-T Service Center or representative.
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