ABB Symphony Harmony Series Instruction page 61

Preventive Maintenance Procedures
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.
5. Dry the edge connector contact area by wiping with a clean
lint-free cloth.
To clean tarnished or deeply stained edge connector contacts:
1. Use a nonabrasive eraser or equivalent to remove tarnish
or stains. Fiberglass or nylon burnishing brushes may also be
used.
2. Minimize electrostatic discharge by using the 80/20 iso-
propyl alcohol/water solution during burnishing.
3. Do not use excessive force while burnishing. Use only
enough force to shine the contact surface. Inspect the edge
connector after cleaning to assure no loss of contact surface.
4. Wipe clean with a lint-free cloth.
Checking Connections
There are exposed AC and DC connections inside the cabinet.
These exposed electrical connections present a shock hazard
that can cause injury or death.
If input or output circuits are a shock hazard after disconnect-
WARNING
ing system power at the power entry panel, then the door of the
cabinet containing these externally powered circuits must be
marked with a warning stating that multiple power sources
exist.
Check all signal wiring, power and ground connections within
the cabinet to verify their integrity. When checking connec-
tions, 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
3 - 4
NOTE: Power to the cabinet should be off while performing this preventive
maintenance task.
WBPEEUI260047A0