MAINTENANCE
PREVENTIVE MAINTENANCE PROCEDURES
I-E96-322A
7 - 3
NOTE: This preventive maintenance task should be performed
while power to the cabinet is off.
1. Check module cable connections.
2. Verify that all power and field wiring connections to the
NTHS03 or NTDI01 termination unit, or NIDI01 termination
module are secure.
Printed Circuit Board Cleaning
There are several circuit board cleaning procedures in this sec-
tion. These procedures cover circuit board cleaning and clean-
ing 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.
To wash the printed circuit board:
1. Clean the printed circuit board by spraying or wiping it
with isopropyl alcohol (99.5% electronic grade). Use a foam
tipped swab to wipe the circuit board.
WARNING
Never clean electrical parts or components with live power
present. Doing so exposes you to an electrical shock hazard.
AVERTISSEMENT
Ne jamais nettoyer des pièces ou composants électriques dont
les circuits sont sous tension; les circuits alimentés pourraient
causer un choc électrique.
WARNING
Wear eye protection whenever working with cleaning solvents.
When removing solvents from printed circuit boards using
compressed air, injury to the eyes could result from splashing
solvent as it is removed from the printed circuit board.
AVERTISSEMENT
Des lunettes de protection devraient être portées lors de travail
avec des solvants nettoyants. Lorsqu'on enlève les solvants
des circuits imprimés à l'aide d'air comprimé, les éclabous-
sures de solvant pourraient causer des blessures aux yeux.