Tektronix WFM5250, Service Manual

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General Maintenance
Exterior Cleaning Clean the exterior surfaces of the chassis with a dry lint-free cloth or a soft-bristle
brush. If any dirt remains, use a cloth or swab dipped in a 75% isopropyl alcohol
solution. Use a swab to clean narrow spaces around controls and connectors. Do
not use abrasive compounds on any part of the instrument that may damaged by it.
CAUTION.
Avoid the use of chemical cleaning agents that might damage the
plastics used in the instrument. Use only deionized water when cleaning the
front-panel buttons. Use a glass cleaner to clean the LCD. For the rest of the
instrument, use a 75% isopropyl alcohol solution as a cleaner and rinse with
deionized water. Before using any other type of cleaner, consult your Tektronix
Service Center or representative.
Inspection
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 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 must 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, check to see if it is necessary to adjust
the instrument. (See Table 2 on page 13.)
CAUTION.
To prevent damage from electrical arcing, make sure that circuit
boards and components are dry before applying power to the instrument.
12 WFM5250 Waveform Monitor Service Manual