MAINTENANCE
PREVENTIVE MAINTENANCE PROCEDURES
I-E96-117B
6 - 3
Printed Circuit Board Cleaning
There are several circuit board cleaning procedures in this sec-
tion. These procedures cover circuit board cleaning, cleaning
edge connectors and circuit board edge connector contacts.
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 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 surface using clean,
dry, filtered compressed air or an antistatic field service vac-
uum cleaner.
Another method of washing the printed circuit board is:
1. Clean the printed circuit board by spraying or wiping the
board with a foam tipped swab wetted in isopropyl alcohol
(99.5% electronic grade).
2. When the circuit board is clean, 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.
5. Dry the edge connector contact area by wiping with a clean
lint-free cloth.
To clean tarnished or deeply stained edge connector contacts:
1. Use an Eberhard Faber (400A) pink pearl eraser, or equiva-
lent to remove tarnish or stains. Fiberglass or nylon burnish-
ing brushes may be used also.
