Tektronix 684A User Manual

Maintenance

TDS 684A, TDS 744A, & TDS 784A Service Manual

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.

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.