Tektronix WFM601, Service Manual

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Maintenance
6–2
WFM 601 - Service Manual
Interior. Clean the interior of the instrument by loosening the accumulated dust
with a dry, soft brush. Once the dirt is loosened remove it with low-pressure air
(high-velocity air can damage some parts). Hardened dirt or grease may be
removed with a cotton-tipped applicator dampened with a solution of mild
detergent and water. Abrasive cleaners should not be used. If the circuit board
assemblies must be removed for cleaning, follow the instructions for removal/re-
placement under the heading of Corrective Maintenance.
After cleaning, allow the interior to thoroughly dry before applying power to the
instrument.
CAUTION.
Do not allow water to get inside any enclosed assembly or component.
Do not clean any plastic materials with organic cleaning solvents, such as
benzene, toluene, xylene, acetone, or similar compounds, because they may
damage the plastic.
In order to operate in all environmental conditions these instruments require
clean unrestricted internal air flow. The air filter is located on the rear panel and
should be checked frequently for dust and grime buildup. A supply of replace-
ment filters was shipped with this instrument.
Filter Replacement. Replacement consists of removing two screws from the
fan cover, lifting out the old filter and replacing it. The cover is remounted with
the two mounting screws. Do not over tighten the screws.
Filter Cleaning. The air filters supplied with this instrument can easily be
cleaned and used again. All that is required is to wash them in warm water and
mild detergent.
Additional Air Filters. Additional air filters can be ordered directly from
Tektronix. The part number for the air filters is listed with the optional
accessories at the rear of the Replaceable Mechanical Parts list, at the back of the
book.
After cleaning, carefully check the instrument for defective connections,
damaged parts, and improperly seated transistors or integrated circuits. The
remedy for most visible defects is obvious; however, if heat-damaged parts are
discovered, determine the cause of overheating before replacing the damaged
part, to prevent additional damage.
Periodic checks of the transistors and integrated circuits are not recommended.
The best measure of performance is the actual operation of the component in the
circuit.
Replacing and Cleaning
the Air Filter
Visual Inspection