Inspection and Cleaning
Maintenance
84
CAUTION
To prevent damage from electrical arcing, ensure that circuit boards
and components are dry before applying power to the oscilloscope.
Table82:Internal Inspection Check List
Item
Inspect For
Repair Action
Circuit boards
Loose, broken, or corroded solder con
nections. Burned circuit boards. Burned,
broken, or cracked circuit run plating.
Resistors
Burned, cracked, broken, or blistered
condition.
Solder connections
Cold solder or rosin joints.
Resolder joint and clean with isopropyl
alcohol.
Capacitors
Damaged or leaking cases. Corroded sol
der on leads or terminals.
Wiring and cables
Loose plugs or connectors. Burned, bro
ken, or frayed wiring.
Firmly seat connectors. Repair or replace
modules with defective wires or cables.
Chassis
Dents and deformations
Straighten, repair, or replace chassis.
Cleaning Procedure
Interior
If, after doing steps 1 and 2, a module is clean upon inspection, skip
the remaining steps.
1. Blow off dust with dry, lowpressure, 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.)
NOTE
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 steps 3 through 7.
3. Gain access to the parts to be cleaned by removing easily accessible
shields and panels (see Removal and Replacement Procedures).
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