Installation Manual

9.2.2
Cleaning
Periodically clean smudges and grime from the exterior of the SLR 1000 Repeater with a soft cloth.
External surfaces include the top cover and repeater enclosure. Use a soft, non-abrasive cloth
moistened in a 0.5% solution of mild dishwashing detergent and water solution. Use a second cloth
moistened in clean water, and clean any dirt or debris from the heatsink fins.
The only factory recommended liquid for cleaning the printed circuit boards and their components is
isopropyl alcohol (100% by volume).
Return to Process
Preventive Maintenance on page 82
9.3
Safe Handling of CMOS and LDMOS Devices
Complementary metal-oxide semiconductor (CMOS) and laterally diffused metal-oxide semiconductor
(LDMOS) devices are used in this family of stations, 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 when disassembling,
troubleshooting, and repairing.
Handling precautions are mandatory for CMOS/LDMOS circuits and are especially important in low
humidity conditions.
DO NOT attempt to disassemble the repeater without first referring to the following CAUTION
statement.
CAUTION: This repeater contains static-sensitive devices. Do not open the repeater unless you
are properly grounded. Take the following precautions when working on this unit:
•
Store and transport all CMOS/LDMOS devices in conductive material so that all exposed
leads are shorted together. Do not insert CMOS/LDMOS devices into conventional plastic
"snow" trays used for storage and transportation of other semiconductor devices.
• Ground the working surface of the service bench to protect the CMOS/LDMOS device. Use
the Motorola Solutions Static Protection Assembly (part number 0180386A82), which
includes a wrist strap, two ground cords, a table mat, and a floor mat, ESD shoes and an
ESD chair.
• Wear a conductive wrist strap in series with a 100k resistor to ground. (Replacement wrist
straps that connect to the bench top covering are Motorola Solutions part number
4280385A59).
• Do not wear nylon clothing while handling CMOS/LDMOS devices.
• Do not insert or remove CMOS/LDMOS devices with power applied. Check all power
supplies used for testing CMOS/LDMOS devices to be certain that there are no voltage
transients present.
• When straightening CMOS/LDMOS pins, provide ground straps for the apparatus used.
• When soldering, use a grounded soldering iron.
• Handle CMOS/LDMOS devices by the package and not by the leads. Before 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.
MN003557A01-AF
Chapter 9: SLR 1000 Maintenance and Disassembly/Reassembly
83