Maintenance
DPO4000 Series Service Manual 4-5
CleaningProcedure — 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 clot h dampened in isopropyl
alcohol (75%solution) and rinsed with warm deionized water. (A cotton-
tipped applicator is useful for cleaning in narrow s paces 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 of75% isopropyl alcohol by doing the following steps:
1. Gain access to the parts to be cleaned by removing easily access ible shields
and panels (see Removal Procedures).
2. Spray wash dirty partswith the isopropyl alcohol and wait 60 seconds for the
majority of thealcohol to evaporate.
3. Use hot (120 _F to 140 _F) deionized waterto thoroughly rinse them.
4. Dry all parts with low-pressure, deionized ai r.
5. Dry all componentsand assemblies in an oven or drying compartment using
low-temperature(125 _F to 150 _F) circulating air.