User's Guide

Page 14
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(8) Switch power off at the transceiver using the rear mounted Power switch. Isolate the transceiver
from the ac and/or dc supplies.
(9) Refit the transceiver’s top cover (take note of repairs caution (1) on page 5 before carrying out
this task). The transceiver can now be returned to service.
Bottom Cover
To remove the bottom cover, locate and unscrew the 15 captive screws securing the bottom cover to the
mainframe. Access can then be gained to the following modules:
❑ PA Control/Rx RF module
❑ Power supply (requires top and bottom covers to be removed)
❑ PA module (requires top cover and bottom covers to be removed)
❑ Front Panel assembly (requires top cover and bottom covers to be removed).
Dangerous voltages are present within the transceiver. Care must be taken by personnel to
avoid accidental contact with exposed circuitry when the bottom cover is removed and
power is applied to the radio.
Removing and Refitting the PA Control/Rx RF Module
The PA Control/Rx RF module is located as shown in Fig 3. A module removal diagram is shown in Fig 6.
Removal
Before attempting to remove the PA Control/Rx RF module, ensure that the transceiver is isolated from
the ac and dc input supplies.
Then proceed as follows:
(1) Remove the transceiver’s bottom cover as described above (take heed of the warning).
(2) Locate the module and disconnect the following connectors (before removing CN7 and CN12,
note the antenna configuration):
❑ CN1 50-way connector (50-way ribbon cable from Processor module)
❑ CN6 10-way connector (10-way ribbon cable from PSU Regulator module)
❑ CN5 SMB connector (reference frequency)
❑ CN3 SMB connector (RF drive)
❑ CN4 SMB connector (forward power sense)
❑ CN2 6-way connector (to PA module). Note caution (3) on page 10)
❑ CN8 SMB connector (to Processor Module)
❑ CN7 SMB connector from the Rx antenna connection or CN13 on the PA module (see
antenna configuration on page 16)
❑ CN12 SMB connector (connects to CN13 on the PA module) or Rx antenna connection (see
configuration on page 16).
(3) Remove the seven M3 x 8 mm captive washer screws that secure the module to the transceiver’s
mainframe.
(4) Remove the module from the chassis.
WARNING Dangerous Voltages