Preventive Maintenance Procedures
WBPEEUI240774A0 7 - 3
This section covers tasks from Table 7-1 that require specific
instructions or further explanation.
• Cleaning printed circuit boards and edge connectors.
• Checking signal, power and ground connections.
Printed Circuit Board Cleaning
There are several circuit board cleaning procedures in this sec-
tion. These procedures cover circuit board cleaning and wash-
ing, cleaning edge connectors and circuit board laminate
between 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
Special Handling
Special HandlingSpecial Handling
Special Handling 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.
2. Remove excess solvent by using compressed air to blow it
free of the circuit board.
Edge Connector Cleaning
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.
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