MAINTENANCE
Section 5 -455 /A2/B2
This section contains information for use in preventive or corrective maintenance. The corrective maintenance portion
includes information on component removal and replacement.
CABINET REMOVAL
WARNING
Dangerous potentials exist at several points inside this instrument. To prevent electrical
shock, do not touch exposed connections or components when the instrument is operated
with the cabinet removed. Disconnect power before cleaning the instrument or replacing
components.
The cabinet top can be removed easily for servicing or recalibration. Using a large coin, rotate the three circular locks clock
wise on each side of the instrument until the slot is vertical, and lift the cabinet top straight up.
PREVENTIVE MAINTENANCE
Preventive maintenance consists primarily of cleaning and visual inspection. When performed on a regular basis, preventive
maintenance will reduce instrument failure and improve reliability. The frequency of maintenance depends on the severity of
the instrument environment. The most convenient time to perform preventive maintenance is usually just prior to recalibra
tion. The following information in general, applies to all three modules in this oscilloscope.
CLEANING
The cabinet helps keep dust out of the instrument interior.
More frequent cleaning is necessary when the instrument is
operated with the cabinet removed. The front cover helps
keep dust away from the front panel and the crt face. The
front cover should be installed when storing or transporting
the instrument.
Interior
Remove accumulated dust and dirt as often as operating
conditions require. Dirt acts as an insulating blanket on
components, preventing efficient heat dissipation, which
can cause overheating and possible component breakdown.
It also provides an electrical conduction path that can cause
instrument failure, especially under high humidity conditions.
The best way to clean the interior is to blow off the accu
mulated dust with dry, low-pressure air (approximately
9 lb/in2). Remove any remaining dirt with a soft brush or
cloth dampened with a mild detergent and water solution.
A cotton-tipped applicator is useful for cleaning in narrow
spaces or for cleaning circuit boards.
REV. A, OCT 1975
5-1
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