Tektronix WVR4000, Service Manual

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Maintenance
Table 1: External inspection checklist
Item Inspect for Repair action
Front panel 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.
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. Defects
found should be repaired immediately.
If any circuit board is repaired or replaced, see if it is necessary to adjust the
instrument. (See Table 1.)
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 checklist
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.
Capacitors Damaged or leaking cases.
Corroded solder on leads or
terminals. Remove and replace
damaged circuit board.
WVR4000 and WVR5000 Service Manual 11