User's Guide

Page 13
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Removing and Refitting the PSU Regulator Module
The PSU Regulator module is located as shown in Fig 3. A module removal diagram is shown in Fig 5.
Removal
Before attempting to remove the PSU Regulator module, ensure that the transceiver is isolated from the
ac and dc input supplies. Then proceed as follows:
(1) Remove the transceiver’s top cover as described on page 10 (take heed of the warning).
(2) Locate the PSU Regulator module and remove the three M3 x 8 mm captive washer screws that
secure the module to the transceiver’s mainframe.
(3) Carefully raise the module to gain access to the module connectors.
(4) Disconnect the following connectors:
❑ CN5 10-way connector (10-way ribbon cable to PA Control/Rx RF module)
❑ CN6 6-way connector (2-way loom to power supply). Note caution (3) on page 10
❑ CN4 14-way connector (14-way ribbon cable to Processor module)
❑ CN3 3-way connector (3-wire loom to PA module)
❑ CN7 3-way connector (3-wire loom to rear panel On/Off switch). Note caution (3) on page 10
❑ CN2 2-way connector (2-wire loom from dc input connector on rear panel)
❑ CN1 4-way connector (4-wire cable from power supply)
❑ CN9 2-way connector (2-wire cable ac input to power supply)
❑ CN8 3-way connector (2-wire loom to rear panel ac input connector plus chassis connection).
(5) Remove the module from the chassis.
Refitting
To refit the PSU Regulator module, proceed as follows:
(1) While holding the module in position, connect the following connectors:
❑ CN8 3-way connector (2-wire loom to rear panel ac input connector plus chassis connection)
❑ CN9 2-way connector (2-wire cable ac input to power supply)
❑ CN1 4-way connector (4-wire cable from power supply)
❑ CN2 2-way connector (2-wire loom from dc input connector on rear panel)
❑ CN7 3-way connector (3-wire loom to rear panel On/Off switch)
❑ CN3 3-way connector (3-wire loom to PA module)
❑ CN4 14-way connector (14-way ribbon cable to Processor module)
❑ CN6 6-way connector (2-way loom to power supply)
❑ CN5 10-way connector (10-way ribbon cable to PA Control/Rx RF module).
(2) Locate the module in position. Ensure no wires are trapped by the module.
(3) Secure the module to the transceiver’s mainframe using the three M3 x 8 mm captive washer
screws removed during the removal procedure.
(4) Re-establish the ac and/or dc supplies (take heed of the warning on page 10).
(5) Switch power on at the radio using the rear mounted Power switch.
(6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(7) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 7.