Park Air Systems T6T, Пользовательская документация

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T6T VHF 100 W Transmitter Page 13 Maintenance
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Removing and Refitting the PA Control Module
The PA Control module is located as shown in Fig 5 . A module removal diagram is shown in Fig 10 .
Dangerous voltages are present within the transmitter. Care must be taken by personnel to
avoid accidental contact with exposed circuitry when the covers are removed and power is
applied to the radio.
Removal
Before attempting to remove the PA Control module, ensure that the transmitter is isolated from the ac
and dc input supplies. Then proceed as follows:
(1) Unscrew the 15 countersunk screws and remove the transmitter bottom cover.
(2) Locate the PA Control module and disconnect the following connectors:
❑
CN1 50-way connector (50-way ribbon cable from Processor module CN1)
❑
CN6 10-way connector (10-way ribbon cable from PSU Regulator module CN5)
❑
CN5 SMB connector (reference frequency from front panel)
❑
CN3 SMB connector (RF drive to Combiner BIT module CN16)
❑
CN4 SMB connector (forward power sense from Combiner BIT module CN27)
❑
CN2 6-way connector (6-wire loom to Combiner BIT module CN15).
(3) Remove the eight M3 x 8 mm captive washer screws that secure the module to the mainframe.
(4) Remove the module from the chassis.
Refitting
To refit the PA Control module, proceed as follows:
(1) Place the module in position. Ensure no wires are trapped by the module.
(2) Fit the eight M3 x 8 mm captive washer screws, previously removed, that secure the module to
the mainframe.
(3) Refit the following connectors to the module:
❑
CN2 6-way connector (6-wire loom to Combiner BIT module CN15)
❑
CN4 SMB connector (forward power sense from Combiner BIT module CN27)
❑
CN3 SMB connector (RF drive to Combiner BIT module CN16)
❑
CN5 SMB connector (reference frequency from front panel)
❑
CN6 10-way connector (10-way ribbon cable from PSU Regulator module CN5)
❑
CN1 50-way connector (50-way ribbon cable from Processor module CN1).
(4) Re-establish the ac and/or dc supplies.
(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 the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure
To Calibrate the Transmitter on page 26 .
WARNING Dangerous Voltages