Preventive Maintenance; Introduction; General Care; Inspection And Cleaning - Tektronix 2445A Service Manual

Maintenance-2445A/2455A Service
9. Use a soldering iron that is connected to earth
ground.
10. Use only approved antistatic, vacuum-type
desoldering tools for component removal.
PREVENTIVE MAINTENANCE
INTRODUCTION
Preventive maintenance consists of cleaning, visual
inspection, and checking instrument performance. When
accomplished regularly, it may prevent instrument malfunc-
tion and enhance instrument reliability. The severity of the
environment in which the instrument is used determines
the required frequency of maintenance. An appropriate
time to accomplish preventive maintenance is just before
instrument adjustment.
GENERAL CARE
The cabinet minimizes accumulation of dust inside the
instrument and should normally be in place when operating
the instrument. The front cover supplied with the instru-
ment provides both dust and damage protection for the
front panel and CRT, and it should be on whenever the
instrument is stored or is being transported.
INSPECTION AND CLEANING
The instrument should be visually inspected and
cleaned as often as operating conditions require. Accumu-
lation of dirt in the instrument can cause overheating and
component breakdown. Dirt on components 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 instrument.
Use
a
nonresidue-type cleaner, preferably isopropyl
alcohol or
a
solution of 1 % mild detergent with 99%
water. Before using any other type of cleaner, con-
sult your Tektronix Service Center or representative.
Exterior
INSPECTION. Inspect the external portions of the
instrument for damage, wear, and missing parts; use
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.
Deficiencies found that could cause personal injury or
could lead to further damage to the instrument should be
repaired immediately.
Table 6-2
External Inspection Check List
Item Inspect For
Repair Action
Cabinet, Lid, Front Panel Cracks, scratches, deformations, damaged Touch up paint scratches and replace
hardware or gaskets. defective components.
Front-Panel Controls Missing, damaged, or loose knobs, buttons, and
Repair or replace missing or defective items.
controls.
Connectors Broken shells, cracked insulation, and deformed Replace defective parts, Clear or wash out
contacts. Dirt in connectors. dirt.
-
Carrying Handle Correct operation. Replace defective parts.
Accessories
Missing items or parts of items, bent pins, broken Replace damaged or missing items, frayed
or frayed cables, and damaged connectors.
cables, and defective parts.
6-2