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Maintenance
TDS 684A, TDS 744A, & TDS 784A Service Manual
6–5
Table 6–2: External Inspection Check List
Item Inspect For Repair Action
Cabinet, front panel,
and cover
Cracks, scratches, deformations,
damaged hardware or gaskets.
Repair or replace defective
module.
Front-panel knobs Missing, damaged, or loose
knobs.
Repair or replace missing or
defective knobs.
Connectors Broken shells, cracked insulation,
and deformed contacts. Dirt in
connectors.
Repair or replace defective
modules. Clear or wash out dirt.
Carrying handle, bail,
cabinet feet.
Correct operation. Repair or replace defective
module.
Accessories Missing items or parts of items,
bent pins, broken or frayed
cables, and damaged connec-
tors.
Repair or replace damaged or
missing items, frayed cables, and
defective modules.
Cleaning Procedure — Exterior.
To clean the oscilloscope exterior, do the following:
1. Remove loose dust on the outside of the oscilloscope with a lint free cloth.
2. Remove remaining dirt with a lint free cloth dampened in a general purpose
detergent-and-water solution. Do not use abrasive cleaners.
3. Clean the light filter protecting the monitor screen with a lint-free cloth
dampened with either isopropyl alcohol or, preferably, a gentle, general
purpose detergent-and-water solution.
CAUTION. To prevent getting moisture inside the oscilloscope during external
cleaning, use only enough liquid to dampen the cloth or applicator.
Inspection — Interior. To access the inside of the oscilloscope for inspection and
cleaning, refer to the Removal and Installation Procedures in this section.
Inspect the internal portions of the oscilloscope for damage and wear, using
Table 6–3 as a guide. Defects found should be repaired immediately.
If any electrical module is repaired or replaced, check Table 5–2 in Section 5 to
see if it is necessary to adjust the oscilloscope.