Maintenance
Table 2: I nternal inspection checklist (cont.)
Item Inspect for Repair action
Resistors Burned, cracked, broken, blistered condition. Remove and replace damaged circuit board.
Solder connections Cold solder or rosin joints.
Resolder joint and clean with isopropyl
alcohol.
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.
Interior Cleaning
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.)
NOTE. If, after performing steps 1 and 2, a module is clean upon inspection,
skip the following steps.
If there is still dust or dirt on the module, the oscilloscope may be spray washed
using a solution of 75% isopropyl alcohol by following these steps:
a. Spray wash d irty parts with isopropyl alcohol and wait 60 seconds for the
majority of the alcohol to evaporate.
b. Use hot (120 °F to 140 °F) deionized w ater to thoroughly rinse them.
c. Dry all parts with low-pressure, deionized air.
d. Dry all components and asse mblies inanovenordryingcompartment
using low-temperature (125 °F to 150 °F) circulating air.
Lubrication
There is no periodic lubrication required for this oscilloscope.
22 MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual
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