Tektronix WFM8200, Service Manual

Page: 43 / 85

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 4-1: External inspection checklist
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
Carrying handle and cabinet
feet Correct operation Repair or replace defective
part
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
Cracks Replace the LCD assembly LCD
Dirty Clean with glass cleaner
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 Table
4-2 as a guide. 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 4-2 on page 4-3.)
CAUTION.
To prevent damage from electrical arcing, make sure that circuit
boards and components are dry before applying power to the instrument.
Table 4-2: 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.
WFM8200 and WFM8300 Waveform Monitors Service Manual 4–3