Safe Handling Of Cmos Devices; Precautions - Motorola MCS 2000 Service Instructions Manual

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• Alcohol is a high-wetting liquid and can carry contamination into unwanted places if an exces-
sive quantity is used. Make sure that controls or tunable components are not soaked with the
liquid. Do not use high-pressure air to hasten the drying process, since this could cause the liq-
uid to puddle and collect in unwanted places.
Upon completion of the cleaning process, use a soft, absorbent, lint-free cloth to dry the area. Do not
brush or apply any isopropyl alcohol to the frame, front cover, or back cover.
NOTE: Always use a fresh supply of alcohol and a clean container to prevent contamination by
dissolved material (from previous usage).

Safe Handling of CMOS Devices

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C a u t i o n

Precautions

1. Eliminate static generators (plastics, styrofoam, etc.) in the work area.
2. Remove nylon or double-knit polyester jackets, roll up long sleeves, and remove or tie back
loose hanging neckties.
3. Store and transport all static-sensitive devices in ESD-protective containers.
4. If at all possible, handle CMOS devices by the package and not by the leads. Prior to touch-
ing the unit, touch an electrical ground to remove any static charge that you may have accu-
mulated. The package and substrate may be electrically common. If so, the reaction of a
discharge to the case would cause the same damage as touching the leads.
5. Disconnect all power from the unit before ESD-sensitive components are removed or inserted
unless otherwise noted.
6. Use a static-safeguarded workstation, which can be accomplished through the use of an anti-
static kit (Motorola part number 01-80386A82). This kit includes a wrist strap, two ground
cords, a static-control table mat and a static-control floor mat. For additional information, refer
to Service and Repair Note SRN F1052, "Static Control Equipment for Servicing ESD Sensi-
tive Products", available from Motorola Literature Distribution 2290 Hammond Drive Schaum-
burg, IL 60173 (847) 576-2826.
When these items are not readily available, observing the following techniques will minimize
chance of damage.
- If a static-sensitive device is to be temporarily set down, use a conductive surface for place-
ment of the device.
December 6, 2004
Complementary metal-oxide semiconductor (CMOS) devices
are used in this family of radios. While the attributes of CMOS
are many, their characteristics make them susceptible to
damage by electrostatic or high voltage charges. Damage can
be latent, resulting in failures occurring weeks or months later.
Therefore, special precautions must be taken to prevent
device damage during disassembly, troubleshooting, and
repair. Handling precautions are mandatory for CMOS
circuits, and are especially important in low humidity
conditions. DO NOT attempt to disassemble the radio without
observing the following handling precautions.
Basic Maintenance: Safe Handling of CMOS Devices
68P81083C20-D