![background image](http://html.mh-extra.com/html/bailey/imfec11/imfec11_instruction_467115043.webp)
MAINTENANCE
PREVENTIVE MAINTENANCE PROCEDURES
WBPEEUI240756A0
6 - 3
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 listed under
in Section 3 when handling printed cir-
cuit 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 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% 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.
WARNING
Never clean electrical parts of components with live power
present. Doing so exposes you to an electrical shock hazard.
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.