Safe Handling Of Cmos And Ldmos Devices - Motorola Expert Series Basic Service Manual

3-2
Cleaning Internal Circuit Boards and Components
Isopropyl alcohol (70%) may be applied with a stiff, non-metallic, short-bristled brush to dislodge
embedded or caked materials located in hard-to-reach areas. The brush stroke should direct the
dislodged material out and away from the inside of the radio. Make sure that controls or tunable
components are not soaked with alcohol. Do not use high-pressure air to hasten the drying process
since this could cause the liquid to collect in unwanted places. After completing of the cleaning
process, use a soft, absorbent, lintless 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).
3.3

Safe Handling of CMOS and LDMOS Devices

Complementary metal-oxide semiconductor (CMOS) devices are used in this family of radios, and are
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 first referring to the following CAUTION
statement.
CAUTION: This radio contains static-sensitive devices. Do not open the radio
!
unless you are properly grounded. Take the following precautions when
working on this unit:
•
•
•
•
•
•
•
•
Store and transport all CMOS devices in conductive material so that all
exposed leads are shorted together. Do not insert CMOS devices into con-
ventional plastic "snow" trays used for storage and transportation of other
semiconductor devices.
Ground the working surface of the service bench to protect the CMOS
device. We recommend using the Motorola Static Protection Assembly (part
number 0180386A82), which includes a wrist strap, two ground cords, a
table mat, and a floor mat.
Wear a conductive wrist strap in series with a 100k resistor to ground.
(Replacement wrist straps that connect to the bench top covering are Motor-
ola part number RSX-4015.)
Do not wear nylon clothing while handling CMOS devices.
Do not insert or remove CMOS devices with power applied. Check all power
supplies used for testing CMOS devices to be certain that there are no volt-
age transients present.
When straightening CMOS pins, provide ground straps for the apparatus
used.
When soldering, use a grounded soldering iron.
If at all possible, handle CMOS devices by the package and not by the leads.
Prior to touching the unit, touch an electrical ground to remove any static
charge that you may have accumulated. 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.
Safe Handling of CMOS and LDMOS Devices