ABB Symphony Harmony Series Instruction page 60

Printed Circuit Board Cleaning
WARNING
General Cleaning and Washing
Edge Connector Cleaning
WBPEEUI260047A0
Never clean electrical parts or 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.
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, corro-
sion or any other contaminant from the circuit board.
Perform all cleaning and handling of the printed circuit
boards at static safe work stations. Always observe the steps
under
Special Handling Special Handling Special Handling Special Handling
circuit boards.
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.
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.
Preventive Maintenance Procedures
in Section 2 when handling printed
3 - 3