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Maintenance
DPO4000 Series Service M anual
4-5
Cleaning Procedure — Interior. To clean the oscilloscope 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 rinsed 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
following steps.
If steps 1 and 2 do not remove all the dust or dirt, the oscilloscope may be spray
washed using a solution of 75% isopropyl alcohol by doing the following steps:
1. Gain access to the parts to be cleaned by removing easily accessible shields
and panels (see Removal Procedur es).
2. Spray wash dirty parts with the isopropyl alcohol and wait 60 seconds for the
majority of the alcohol to evaporate.
3. Use hot (120 _F to 140 _F) deionized water to thoroughly rinse them.
4. Dry all parts with low-pressure, deionized air.
5. Dry all components and assemblies in an oven or drying compartment using
low-temperature (125 _F to 150 _F) circulating air.