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MAINTENANCE
PREVENTIVE MAINTENANCE PROCEDURES
6 - 6
I-E96-508C
®
8. Replace the power entry panel top cover and install the
power entry panel.
9. Connect all wires and cables removed from the power entry
panel.
Printed Circuit Board Cleaning
There are several circuit board cleaning procedures in this sec-
tion. These procedures cover circuit board cleaning and wash-
ing, cleaning edge connectors and circuit board laminate
between edge connectors. Use the procedures that meet the
needs of each circuit board. Remove all dust, dirt, oil, corrosion
or any other contaminant from the circuit board.
Do all cleaning and handling of the printed circuit boards at
static safe work stations. Always observe the steps under
in Section 3 of this instruction when handling
printed circuit boards.
GENERAL CLEANING AND WASHING
If the printed circuit board needs minor cleaning:
Remove dust and residue from the printed circuit board sur-
face using clean, dry, filtered compressed air or an antistatic
field service vacuum cleaner.
To wash the printed circuit board:
1. Clean the printed circuit board by spraying or wiping it
with isopropyl alcohol (99.5% electronic grade). Use a foam
tipped swab to wipe the circuit board.
2. Remove excess solvent by using compressed air to blow it
free of the circuit board.
EDGE CONNECTOR CLEANING
To clean edge connector contacts:
1. Use a solvent mixture of 80% isopropyl alcohol (99.5% elec-
tronic grade) and 20% distilled water.
2. Soak a lint-free cloth with the solvent mixture.
3. Work the cloth back and forth parallel to the edge connec-
tor contacts.
4. Repeat with a clean cloth that is soaked with the solvent
mixture.