Motorola Astro XTS Instruction Manual page 52

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To avoid damaging CMOS ICs, take the following precautions when
handling, shipping, and servicing them.
1. Before touching a circuit module, particularly after having moved
around in the service area, touch both hands to a bare-metal,
earth-grounded surface. This discharges any static charge you
may have accumulated.
Note: Wear a conductive wrist strap (Motorola part number
RSX-4015A) to minimize the buildup of static charges
on your person while you are servicing CMOS
equipment.
When wearing a conductive wrist strap, be
careful near sources of high voltage. By
! !
grounding you thoroughly, the wrist strap also
increases the danger of lethal shock from
W A R N I N G
accidental contact with such a source.
2. Whenever possible, avoid touching any electrically conductive
parts of the circuit module with your hands.
3. Check the "Installation" and "Maintenance" sections of this
manual and the notes on the schematic to find out whether or
not you can insert or remove circuit modules with power applied
to the unit, and act accordingly.
4. When servicing a circuit module, avoid carpeted areas, dry
environments, and the wearing of static-generating clothing.
5. Be sure that all electrically powered test equipment is grounded.
Attach the ground lead from the test equipment to the circuit
module before connecting the test probe. Similarly, disconnect
the test probe before removing the ground lead.
6. When you remove a circuit module from the system, lay It on a
sheet of aluminum foil or other conductive surface connected to
ground through 100,000 ohms of resistance.
! !
If the aluminum foil is connected directly to
ground, you may get a shock if you touch it and
W A R N I N G
another electrical circuit at the same time.
7. When soldering, be sure the soldering iron is grounded.
8. Before connecting jumpers, replacing circuit components, or
touching CMOS pins (if this becomes necessary during the
replacement of an integrated-circuit device), be sure to discharge
any static buildup on your person (see step 1, above). Because you
can have a voltage difference across your body, you should use
only one hand if you must touch the board wiring or any of the
pins on the CMOS device.
9. When replacing a CMOS integrated-circuit device, leave the
device in its metal rail container or conductive foam until you are
ready to insert it into the pronged circuit module.
10. Connect any low-impedance test equipment, such as a pulse
generator, to CMOS device inputs after you have applied power to
the CMOS circuitry. Similarly, disconnect such low-impedance
equipment before turning off the power.