Tektronix TDS 420A Service Manual

Maintenance
6-4
TDS 420A, TDS 430A & TDS 460A 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 420A, TDS 430A, &
TDS 460A 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 it is a major component
of the oscilloscope cooling system. The cabinet should normally be in place
when operating the oscilloscope. The front cover protects the front panel and
display from dust and damage. Install the front cover when storing or transport-
ing 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 w hich 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.
Avoid the use of high pressure compressed air when cleaning dust from the
interior of this instrument. (High pressure air can cause ESD.) Instead, use low
pressure compressed air (about 9 psi).
Inspection — Exterior. Using Table 6--2 as a guide, inspect the outside of the
oscilloscope for damage, wear, and missing parts. 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

Tektronix TDS 420A Specifications

General

Brand	Tektronix
Model	TDS 420A
Category	Test Equipment
Language	English