General Maintenance
Inspection — Exterior.
Inspect the outside of the instrument for damage, wear, and
missing parts, using the following table as a guide. Immediately repair defects
that could cause personal injury or lead to further damage to the instrument.
Table 1: External inspection check list
Item
Inspect for
Repair action
Cabinet, front panel, and
cover
Cracks, scratches,
deformations, damaged
hardware
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
Rackmount slides
Correct operation
Repair or replace defective
module
Accessories
Missing items or parts of
items, bent pins, broken or
frayed cables, and damaged
connectors
Repair or replace damaged
or missing items, frayed
cables, and defective
modules
Inspection — Interior.
To access the inside of the instrument for inspection and
cleaning, you will need to remove the top cover.
Inspect the internal portions of the instrument for damage and wear, using the
following table as a guide. Defects found should be repaired immediately.
If any circuit board is repaired or replaced, check the following table to see if it
is necessary to adjust the instrument.
CAUTION.
To prevent damage from electrical arcing, ensure that circuit boards
and components are dry before applying power to the instrument.
Table 2: Internal inspection check list
Item
Inspect for
Repair action
Circuit boards
Loose, broken, or corroded
solder connections.
Burned circuit boards.
Burned, broken, or cracked
circuit-run plating.
Remove and replace
damaged circuit board.
Resistors
Burned, cracked, broken,
blistered condition.
Remove and replace
damaged circuit board.
Solder connections
Cold solder or rosin joints.
Resolder joint and clean
with isopropyl alcohol.
WVR7200 Waveform Rasterizer Service Manual
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