User's Manual

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. We
recommend using 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.
• If at all possible, handle CMOS/LDMOS 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.
11.5
Disassembly
11.5.1
Disassembly – General
Station modules suspected of being faulty must be replaced with known good modules to restore the
repeater to proper operation. The following are typical procedures to remove each of the repeater
modules.
Procedure:
1 Power cord (and battery backup power, if used) and all external cables must be disconnected
before opening up repeater. Label each removed cable as required to ensure it is properly
reconnected.
2 Take the proper grounding precautions as stated in Safe Handling of CMOS and LDMOS
Devices on page 98.
3 When disassembling repeater, retain all screws for reuse.
The following tools are required for disassembling and reassembling the repeater:
• Torque Drivers (T10, T20 and T30). See Torque Charts on page 117 for the different size
fasteners of screw torques.
• Hex Nut Drivers (16 mm, ¾ inch [19 mm])
• Needle Nose Pliers (optional)
• Torque Gauge capable of measuring torque up to 20 in-lb (2.3 N-m) within
+/- 1 in-lb (0.1 N-m)
MN001436A01-AD
Chapter 11: SLR 5000 Series Maintenance and Disassembly/Reassembly
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