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Maintenance
6–4
TDS 684A, TDS 744A, & TDS 784A Service Manual
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 TDS 684A and 7XXA Digitizing
Oscilloscopes. Inspection and cleaning are done as preventive maintenance.
Preventive maintenance, when done regularly, may prevent oscilloscope
malfunction and enhance its reliability.
Preventive maintenance consists of visually inspecting and cleaning the
oscilloscope and using general care when operating it.
How often to do maintenance depends on the severity of the environment in
which the oscilloscope is used. A proper time to perform preventive maintenance
is just before oscilloscope adjustment.
The cabinet helps keep dust out of the oscilloscope and should normally be in
place when operating the oscilloscope. The oscilloscope’s front cover protects
the front panel and display from dust and damage. Install it when storing or
transporting the oscilloscope.
Inspect and clean the oscilloscope as often as operating conditions require. The
collection of dirt on components inside can cause them to overheat and break-
down. (Dirt acts as an insulating blanket, preventing efficient heat dissipation.)
Dirt also provides an electrical conduction path
that could cause an oscilloscope
failure, especially under high-humidity conditions.
CAUTION. Avoid the use of chemical cleaning agents which might damage the
plastics used in this oscilloscope. Use only deionized water when cleaning the
menu buttons or front-panel buttons. Use a 75% isopropyl alcohol solution as a
cleaner and rinse with deionized water. Before using any other type of cleaner,
consult your Tektronix Service Center or representative.
Inspection — Exterior. Inspect the outside of the oscilloscope for damage, wear,
and missing parts, using Table 6–2 as a guide. Oscilloscopes that appear to have
been dropped or otherwise abused should be checked thoroughly to verify correct
operation and performance. Immediately repair defects that could cause personal
injury or lead to further damage to the oscilloscope.
General Care
Inspection and Cleaning
Procedures