Appendix C - Cmos Handling Procedures - Kenwood R-5000 User Handbook Manual

Complementary Offset Symmetry Metal-Oxide Semiconductor (CMOS) devices have
diode protection against detrimental electrical conditions such as static electricity. Although
these devices contain circuitry to protect their inputs against damage from high voltages, care
should be taken in handling them.
Severe electrical conditions can occur during handling. Static electricity generated by
someone walking across a rug can be as high as 4 to 15 kV. This depends upon the humidity,
friction, and other factors. These voltages can be disastrous when discharged into a CMOS
part. CMOS devices have built-in protection which can protect itself from overvoltages.
However, they can not protect the part from the high voltages described above.
Below are some suggested CMOS handling procedures. If you are not sure what you
are doing, enlist the help of an experienced technician.
All CMOS parts show be stored and transported in the package they were delivered in.
This package prevents static electrical charges from building up. Never use plastic bags or bins.
1. Avoid contact with the leads of the part. Always handle the part by the ends or
sides opposite the leads.
2. Avoid contact between printed wiring boards or CMOS parts and synthetic
clothing while handling static sensitive parts or boards containing static devices.
3. Do not insert or remove CMOS parts with the power still applied to the unit.
4. Use only soldering irons and tools that are properly grounded. Ungrounded
soldering iron tips will destroy CMOS parts. Never use soldering guns.
APPENDIX C
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