General Maintenance
Table 2: Internal inspection check list (cont.)
Item
Inspect for
Repair action
Capacitors
Damaged or leaking cases.
Corroded solder on leads or
terminals.
Remove and replace
damaged circuit board.
Wiring and cables
Loose plugs or connectors.
Burned, broken, or frayed
wiring.
Firmly seat connectors.
Repair or replace modules
with defective wires or
cables.
Chassis
Dents, deformations, and
damaged hardware.
Straighten, repair, or replace
defective hardware.
Cleaning Procedure – Interior.
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
and
, 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.
Lubrication.
There is no periodic lubrication required for the instrument.
Troubleshooting
The procedures in this section will help you trace the root cause of a problem back
to one of the replaceable parts. In general, this is a board-level replacement but
there are a few components on some boards that are replaceable.
WARNING.
Before performing this or any other procedure in this manual, read the
General Safety Summary and Service Safety Summary found at the beginning of
this manual.
To prevent possible injury to service personnel or damage to electrical component,
refer on how to prevent ESD. (See page 17.).
20
WVR7200 Waveform Rasterizer Service Manual
