MAINTENANCE
PREVENTIVE MAINTENANCE PROCEDURES
I-E96-607A
6 - 3
PREVENTIVE MAINTENANCE PROCEDURES
This section covers tasks from Table
that require specific
instructions or further explanation:
•
Checking signal, power and ground connections.
•
Cleaning printed circuit boards and edge connectors.
Checking Connections
Check all signal wiring, power and ground connections to the
interface modules and their associated termination unit or
module. When checking connections, 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 should be off while performing this pre-
ventive maintenance task.
1. Verify module cable connections.
2. Verify that all power and field wiring connections to the
interface termination units or termination modules are secure.
Printed Circuit Board Cleaning
There are several circuit board cleaning procedures in this sec-
tion. These procedures cover circuit board cleaning and wash-
ing, and cleaning 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 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 isopropyl alcohol (99.5% electronic grade). Use a
foam tipped swab to wipe the circuit board.
2. When the circuit board is clean, remove excess solvent by
using compressed air to blow it free of the circuit board.
