Preventive Maintenance; Introduction; Inspection And Cleaning - Tektronix 2246 1Y Service Manual

Maintenance—2246 1Y and 2246 Mod A Service
4. Keep anything capable of generating or holding
a static charge off the work station surface.
5. Keep the component leads shorted together
whenever possible.
6. Pick up components by their bodies, never by
their leads.
7. Do not slide the components over any surface.

INTRODUCTION

Preventive maintenance consists of cleaning, visual
inspection, and checking instrument performance.
Preventive maintenance on a regular basis may pre­
vent instrument malfunction and improve instrument
reliability. The required frequency of maintenance
depends on the severity of the environment in which
the instrument is used. An appropriate time to do
preventive maintenance is just before instrument
adjustment.

INSPECTION AND CLEANING

Visually inspect and clean the 2246 1Y or 2246
Mod A as often as operating conditions require.
Accumulation of dirt in the instrument can cause
overheating and component breakdown. Dirt on
components acts as an insulating blanket, pre­
venting efficient heat dissipation. It also provides an
electrical conduction path that could result in instru­
ment failure, especially
conditions.
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Do not use chemical cleaning agents which
might damage the plastics used in this instru­
ment. Use a nonresidue-type
preferably isopropyl alcohol or a solution of
1% m ild detergent with 99% water. Before
using any other type of cleaner, consult your
Tektronix Service Center or representative.
6-2

PREVENTIVE MAINTENANCE

under high-humidity
cleaner,
8. Avoid handling components in areas that have a
floor or work-surface covering capable of gen­
erating a static charge.
9. Use a soldering iron that is connected to earth
ground.
10. Use only approved
desoldering tools for component removal.
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 that could cause per­
sonal injury or could lead to further instrument
damage should be repaired immediately.
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£ CAUTION §
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Do not allow moisture to get inside the instru­
ment during external cleaning.
enough liquid to dampen
applicator.
CLEANING. Loose dust on the outside of the instru­
ment can be removed with a soft cloth or small soft-
bristle brush. The brush is particularly useful on and
around the controls and
remaining dirt with a soft cloth dampened in a mild
detergent-and-w ater solution. Do not use abrasive
cleaners.
Clean the light filters and the crt face with a soft lint-
free cloth dampened with either isopropyl alcohol or
a mild detergent-and-w ater solution.
Interior
To access internal portions of the instrument for
inspection and cleaning, refer to the Removal and
Replacement Instructions
Maintenance part of this section.
antistatic, vacuum-type
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Use only
the cloth or
connectors. Remove
in the Corrective