User's Manual

9-14 68P81093C75-A
• If the proper display is not obtained, suspect faulty
SCM or Exciter Module
Step 8. This completes the Verifying Transmitter Circuitry
test procedure. If all displays and measurements are
correct, the transmitter circuitry may be considered to
be operating properly.
• Remove test equipment.
• Restore the station to normal service.
• Return to the trouble shooting flow chart to resume
the troubleshooting sequence.
Verifying Receiver
Circuitry
Introduction
While most module faults can be detected by running the station
diagnostics provided by the RSS, the following procedure provides
a more traditional method of troubleshooting the receiver circuitry.
This procedure is useful in the event that the RSS is not at hand, or,
for some reason, cannot be utilized (PC malfunction, etc.)
This procedure allows the service technician to make minor
adjustments and verify the proper operation of the station receive
circuitry, including:
• Receiver Module
• Power Supply Module
• 2.1 MHz Reference Oscillator Circuitry
• Receiver-related circuitry in the Station Control Module (SCM)
In general, the receiver circuitry is exercised by injecting and
measuring signals using a Motorola R2001 Communications
Analyzer (or equivalent). Measured values outside the acceptable
range indicate a faulty module; values within range verify proper
operation of the above listed modules and circuitry.
Required Test Equipment The following test equipment is required to perform the procedure:
• Motorola R2001 Communications Analyzer (or equivalent)
• Telephone-style handset with PTT switch (TMN6164, or
equivalent)
• RJ-11 to BNC cable
• Dummy Load (50Ω, station wattage or higher)