Tektronix TPS2000B Series, Service Manual

Page: 57 / 92

Maintenance
Cleaning procedure, exterior.
To clean the oscilloscope exterior and probes:
1. Remove loose dust on the outside of the oscilloscope and probes with a
lint-free cloth. Use care to avoid scratching the clear glass display shield.
2. Use a soft cloth dampened with water to clean the oscilloscope, or use a 75%
isopropyl alcohol solution for more ef
fi cient cleaning.
CAUTION.
To prevent getting moisture inside the oscilloscope during external
cleaning, use only enough liquid to dampen the cloth or applicator.
To avoid damage to the surface of the oscilloscope or probes, do not use any
abrasive or chemical cleaning agents.
Inspection, interior.
Inspect and clean the interior if it appears that the oscilloscope
may have been damaged or exposed to an unusually dirty environment.
To inspect and clean the interior, disassemble the oscilloscope by completing
each of the disassembly procedures in the order given. (See page 45,
Removal
and Installation Procedures .)
Inspect the internal portions of the oscilloscope for damage and wear using the
following table as a guide. Repair defects immediately.
Table 14: Internal inspection checklist
Item Inspect for Repair action
Front and Rear Case Cracks or deformations.
Scratched lettering or
display
fi lter. Loose
connectors or labels.
Repair or replace defective
hardware.
Circuit boards Loose, broken, or corroded
solder connections.
Burned circuit boards.
Burned, broken, or cracked
circuit-run plating. Remove failed module and
replace with a new module.
Solder connections Cold solder or rosin joints. Resolder joint and clean with
isopropyl alcohol.
Wiring and cables Loose plugs or connectors.
Burned, broken, or frayed
wiring. Firmly seat connectors.
Repair or replace modules
with defective wires or
cables.
TPS2000B Series Digital Storage Oscilloscopes Service Manual 43