Bailey INFI 90 Instruction page 66

MAINTENANCE
Do all cleaning and handling of the printed circuit boards at
static safe work stations. Always observe the steps under SPE-
CIAL HANDLING
in Section 3 of this instruction when han-
dling 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.
Another method of washing the printed circuit board is:
1. Clean the printed circuit board by spraying it with isopro-
pyl alcohol (99.5% electronic grade) or wiping the board with a
foam tipped swab wetted in isopropyl alcohol.
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.
2. Minimize electrostatic discharge by using the 80/20 iso-
propyl alcohol and water solution during burnishing.
3. Do not use excessive force while burnishing. Use only
enough force to shine the contact surface. Inspect the edge
connector after cleaning to assure no loss of contact surface.
PREVENTIVE MAINTENANCE PROCEDURES
I-E96-610A 6 - 3