User Manual

RT7000-MSOP 4-1
CHAPTER 4
SERVICING
Detailed servicing information is beyond the scope of this manual. Only
experienced personnel should make adjustments or attempt any serious service
work. Reference to the RT7000 technical manual (RT7000-MS) is essential.
The RT7000 is of modular construction. If spare boards are available, non-
technical personnel are able to repair most faults in the field. It is strongly
recommended that non-technical personnel receive instruction from
experienced technicians in the replacement of boards.
The RT7000 has a BITE system that aids in troubleshooting down to the
individual board level. When a fault occurs, a BITE fault message is displayed
indicating the specific board affected. The BITE runs automatically on power
up or whenever Alpha 20 is selected.
Routine Maintenance
The RT7000 does not normally require periodic maintenance except to check
the calibration of the master oscillator. It is often convenient to program an
unused channel to a known frequency standard such as WWV (radiates
10,000W on 5, 10 and 15 MHz). This enables regular checks of the frequency
calibration.
Keep the exterior of the RT7000 clean by wiping it with a damp cloth and
polishing it with a soft dry cloth. Make sure all knobs are secure and connectors
tight. If you open the RT7000, make sure coaxial cables are tight and the board
connectors firmly in place. Use compressed air to remove any dirt or dust.
Board Access and Replacement
The top and bottom covers are each retained by 24 screws. After removal of the
retaining screws, the covers can be lifted off the RT7000. For board locations,
refer to the "Board Locations" figure on page 4-2.
CAUTION: When the transmitter is operating, high RF voltages are
present on the power amplifier and filter boards. Use caution as
these RF voltages can cause burns.
All boards, with the exception of the power amplifier, filter and front panel, are
plug-in board assemblies easily accessible from the top of the radio.