Sony Tektronix WFM 1125 Service Manual page 120

Maintenance
6-6
Table 6-3: Internal Inspection check list (Cont.)
Item Inspect for
Wiring and cables Loose plugs or connectors.
Burned, broken, or frayed wiring.
Chassis Dents, deformations, and dam
aged hardware.
Cleaning Procedure Interior. To clean the waveform monitor interior, do 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 8.
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. Use hot (120_ F to 140_ F) deionized water to thoroughly rinse them.
7. Dry all parts with low-pressure, deionized air.
8. Dry all components and assemblies in an oven or drying compartment using
low-temperature (125_ F to 150_ F) circulating air.
Lubrication. There is no periodic lubrication required for this waveform monitor.
Repair action
Firmly seat connectors. Repair or
replace modules with defective
wires or cables.
Straighten, repair, or replace
defective hardware.
WFM 1125 Option 0A/0B/0C/0D Service Manual