Tait TM8235, Руководство по обслуживанию

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108 General Information TM8100/TM8200 Service Manual
© Tait Electronics Limited June 2006
4.3 Servicing Precautions
Introduction
This section discusses the precautions that need to be taken when servicing
the radios. These precautions fall into the following categories:
■
mechanical issues
■
compliance issues
■
anti-static precautions
■
transmitter issues.
Service technicians should familiarize themselves with these precautions
before attempting repairs of the radios.
Use of Torque-
drivers
Apply the correct torque when using a torque-driver to tighten a screw or
nut in the radio. Under-torquing can cause problems with microphonics and
heat transfer. Over-torquing can damage the radio. The illustrations in
“Disassembly and Reassembly” on page 129 show the correct torque values
for the different screws and nuts.
Non-scratch Bench
Tops
Use workbenches with non-scratch bench tops so that the mechanical parts
of the radio are not damaged during disassembly and re-assembly.
(The workbench must also satisfy the anti-static requirements specified
below.) In addition, use a clear area of the bench when disassembling and re-
assembling the radio.
Compliance
Issues
Note
The radio is designed to satisfy the applicable compliance regula-
tions. Do not make modifications or changes to the radio not
expressly approved by TEL. Failure to do so could invalidate com-
pliance requirements and void the Customer’s authority to operate
the radio.
Sealing of Radio
To maintain the sealing of the radio to IP54 standards, ensure that all bungs
and seals are fitted after servicing the radio. These are for the auxiliary, RF,
external options, and programming connectors:
■
bung for auxiliary connector
■
rubber seal for RF connector
■
bung for aperture for options connector (connector not fitted)
■
cover seal for options connector (connector fitted).
In addition, ensure that the grommet sealing the aperture to the microphone
connector of the control head is properly fitted.
ESD Precautions
Important
This equipment contains devices which are susceptible to
damage from static discharges. You must handle these
devices carefully and according to the procedures described
in the manufacturers’ data books.
Purchase an antistatic bench kit from a reputable manufacturer and install
and test it according to the manufacturer’s instructions.
Figure 4.1 shows a
typical antistatic bench set-up.