WMMPXlWU~ Inspection and Cleaning
Inspection and Cleaning describes how to inspect for dirt and damage on,
and how to clean the exterior and interior of, the Laboratory DC Power Supply.
Such inspection and cleaning are performed as preventative maintenance.
Preventive maintenance, when performed regularly, may prevent instrument
malfunction and enhance reliability.
Preventive maintenance consists of visually inspecting and cleaning the power
supply and using general care when operating it.
The severity of the environment in which the power supply is used determines
the required frequency of maintenance. An appropriate time to perform preven-
tive maintenance is just before power supply adjustment.
General Care
The cabinet minimizes accumulation of dust inside the Laboratory DC Power
Supply and should normally be in place when operating the power supply.
Inspection
and The Laboratory DC Power Supply should be visually inspected and cleaned
Cleaning Procedures
as Ofte
"
as
°P
eratin
9 conditions require. Accumulation of dirt in the power
supply can cause overheating and component breakdown. Dirt on compo-
nents acts as an insulating blanket, preventing efficient heat dissipation. It
also provides an electrical conduction path that could result in instrument
failure,
especially under high-humidity conditions.
Avoid the use of chemical cleaning agents which might damage the
plastics used in this power
supply.
Use only deionized water when
cleaning the front
panel.
Use a 75% isopropyl alcohol solution as a
cieaner and rinse with deionized
water.
Before using any other type
of
cleaner,
consult your
Tektronix
Service Center or representative.
Inspect Exterior
Inspection - Inspect the outside of the power supply for damage, wear, and
missing parts, using Table 6-2 as a guide. Instruments that appear to have
been dropped or otherwise abused should be checked thoroughly to verify
correct operation and performance. Immediately repair deficiencies that could
cause personal injury or lead to further damage to the power supply.
PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual
REVAUG 1991
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