1. Introduction
GEM80-400
Page 1-26
ALSPA GEM80-400 CONTROLLER TECHNICAL MANUAL
Issue 3 04/99
Protective measures are required when handling PCBs to prevent damage to
ESDs. When handling PCBs containing ESDs the following rules must be
observed:
(1
Personnel handling PCBs shall NOT wear outer clothing which will generate
a static charge, e.g. synthetic materials like nylon, cotton is preferable.
(2)
All personnel handling PCBs shall put themselves in contact with a
grounded surface before removing PCBs from their protective packing or
from equipment, see the 'Recommended Antistatic Equipment' section,
later in this chapter. The antistatic equipment should be kept on during all
PCB handling.
(3)
Avoid finger contact with devices on the PCB and with its connectors
(4)
If it is necessary to place PCBs down 'unprotected', place on a static
shielding bag, refer to the section 'Recommended Antistatic Equipment', in
this chapter
(5))
PCBs shall be protected by a static shielding bag when out of equipment
1.14.4.
Protection During Arrival, Handling and Storage at Site
If PCBs are shipped in their own individual packing, remove them from the
cardboard box but leave them in the protective static shielding bag, or with
the conductive foam shorting strip on, until they are plugged into the
equipment. If the boards are to be stored for any length of time, leave them
in the original packing until they are needed.
1.14.5.
Protection During Setting Up of Equipment
The following precautions must be taken during testing/setting up operations
on equipment containing PCBs with ESDs:
(1)
All test equipment must be grounded to a common earth point.
(2)
The system power and test equipment must be switched OFF
before inserting or withdrawing PCBs
(3)
When possible, power supply voltages should be applied before
signal inputs, and should be maintained until signal inputs are
removed
(4)
Dielectric strength and insulation resistance tests should not be
carried out with the PCBs installed in the equipment
(5)
Do not use audible continuity tests on PCBs.
(6)
Do not use 'Freeze' Aerosols on PCBs.
1.14.6.
Protection During Maintenance and Spares Handling
If it is necessary to return any PCBs to Cegelec Industrial Controls Ltd for repair,
they must be enclosed in a static shielding bag, and suitably protected by
wrapping in foam plastic, and packed in a box labelled 'Caution Static
Sensitive PCBs'.