General Maintenance
6. Do not slide the
circuit boards over any surface.
7. Avoid handling circuit boards in areas that have a floor o r work-surface
covering capa
ble of generating a static charge.
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 waveform monitor.
Inspection and cleaning are done as preventive maintenance. Preventive
maintenance, when done regularly, may prevent waveform monitor malfunction
and enhance its reliability.
Preventive maintenance consists of visually inspecting and cleaning the waveform
monitor and using general care when operating it.
How often maintenance should be performed depends on the severity of the
environment in which the waveform m onitor is used. A proper time to perform
preventive maintenance is just before any waveform monitor adjustment.
Genera
l Care
The cabinet helps keep dust out of the waveform monitor and should normally
be in place when operating the waveform monitor.
WARNING. To prevent injury or death, power down the instrument and disconnect
it fr
om line voltage before performing any p rocedure that follows.
Interior Cleaning
Use a dry, low-velocity stream of air to clean the interior of the chassis. Use a
sof
t-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.
Exterior Cleaning
C
lean 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 waveform monitor. Use only d eionized 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 Cente r or representative.
4–2 WFM6120, WFM7020, and WFM7120 Waveform Monitors Service Manual