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SERVICE
MODEL
8559A
8
-
12.
Printed Circuit Board Edge Connector
Contact Cleaning
MATERIALS:
Lint
-
free cloth or equivalent (HP Part Number
93
10-0039, Check Digit 3).
Solution of 80% electronics
-
grade isopropyl
alcohol and 20% water.
Static
-
free work station.
PROCEDURE:
Dampen the cloth with the alcohol and water
solution and scrub the edge connector contacts
vigorously, using a circular motion. Polish one
side of the board at a time until the contacts
shine, keeping the cloth damp to dissolve con
-
taminants and reduce static electricity.
Using a clean cloth, dry the contacts by wiping
from their inside to outside edge. This prevents
particles from building up on the contact edges.
Do not use erasers to clean the edge
connectors They cause microscopic
damage to the contact surface,
removing the thin gold plating and
exposing the nickel under
-
plating,
which eventually corrodes. Erasers
also leave a film on the contact and
generate static electricity.
Do not use paper of any kind to clean
the edge connector contacts. Paper
or lint particles left on the edge con
-
tact surface can cause intermittent
electrical connections.
Do not touch contact or trace
sur-
faces with bare hands. Always handle
the board by its edges.