MAINTENANCE
PREVENTIVE MAINTENANCE PROCEDURES
I-E96-203C
6 - 3
vacuum cleaner. Another method of washing the printed cir-
cuit 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%
electronic 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 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 equiv-
alent to remove tarnish or stains. Fiberglass or nylon bur-
nishing brushes may also be used.
2. Minimize electrostatic discharge by using the 80/20 iso-
propyl alcohol/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.
Checking Connections
Check all signal wiring, power and ground connections within
the cabinet to verify their integrity. When checking connec-
tions, always turn a screw, nut or other fastening device in
the direction to tighten only. If the connection is loose, it will
be tightened. If the connection is tight, the tightening action
will verify that it is secure. There must not be any motion
done to loosen the connection.
NOTE: Power to the cabinet must be off while performing this task.
Verify that all cable connections are secure.