Tektronix WFM5250, Руководство по обслуживанию

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General Maintenance
Inspection and Cleaning
Inspection and Cleaning describes how to inspect for dirt and damage. It also
describes how to clean the exterior and interior of the instrument. Inspection and
cleaning are done as preventive maintenance. Preventive maintenance, when done
regularly, may prevent malfunction and enhance reliability.
Preventive maintenance consists of visually inspecting and cleaning the
instrument and using general care when operating it.
How often maintenance should be performed depends on the severity of the
environment in which the instrument is used. A proper time to perform preventive
maintenance is just before any instrument adjustment.
General Care
The cabinet helps keep dust out and should normally be in place during operation.
There is no periodic lubrication required for the instrument.
WARNING. To prevent injury or death, power off the instrument and disconnect it
from line voltage before performing any procedure that follows.
Interior Cleaning Use a dry, low-velocity stream of air to clean the interior of the chassis. Use a
soft-bristle, non-static-producing brush for cleaning around components. If you
must use a liquid for minor interior cleaning, use a 75% isopropyl alcohol solution
and rinse with deionized water.
To clean the instrument interior, perform the following steps:
1. Blow off dust with dry, low-pressure, deionized air (approximately 9 psi).
2. Remove any remaining dust with a lint-free cloth dampened in isopropyl
alcohol (75% solution) and rinse with warm deionized water. (A cotton-tipped
applicator is useful for cleaning in narrow spaces and on circuit boards.)
STOP. If, after doing steps 1 and 2 , a module is clean upon inspection, skip
the remaining steps.
3. If steps 1 and 2 do not remove all the dust or dirt, the instrument may be spray
washed using a solution of 75% isopropyl alcohol by doing steps 4 through 6.
4. Gain access to the parts to be cleaned by removing easily accessible shields
and panels.
5. Spray wash dirty parts with the isopropyl alcohol and wait 60 seconds for the
majority of the alcohol to evaporate.
6. Dry all parts with low-pressure, deionized air.
WFM5250 Waveform Monitor Service Manual 11