General Maintenance
Inspection an
d Cleaning
Inspection and Cleaning describes how to inspect for d irt and damage. It also
describes how to clean the exterior and interior of the waveform rasterizer.
Inspection a
nd cleaning are done as preventive maintenance. Preventive
maintenance, when done regularly, may prevent waveform rasterizer malfunction
and enhance its reliability.
Preventive maintenance consists of visually inspecting and cleaning the waveform
rasterizer a nd using general care when operating it.
How often maintenance should be performed depends on the severity of the
environment in w hich the waveform rasterizer is used. A proper time to perform
preventive maintenance is just before any waveform rasterizer adjustment.
General Care
The cabinet helps keep dust out of the waveform rasterizer and should normally
be in place when operating the waveform rasterizer.
Module Han dling
When h
andling modules comprising circuit boar ds, especially larger c i rcuit
boards, support the board on two sides to avoid flexing of the board material.
Flexing can cause breaks in the solder joints of SMDs.
WARNING. Before performing any procedure that follows, power down the
instrument and disconnect it from line voltage.
Int
erior 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
an
d rinse with deionized water.
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 c onnectors.
Do not use abrasive compounds on any part of the chassis that may damage the
chassis.
CAUTION. Avoid the use of chemical cleaning agents that might damage the
plastics used in the waveform rasterizer. Use only deionized water when cleaning
the front-panel buttons. 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.
4–2 WVR6020, WVR7020, and WVR7120 Waveform Rasterizers Service Manual
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