Park Air Systems Limited B63300HS User Manual
T6T 300 Watt VHF Transmitter
Page 124
Maintenance
(11) Switch power to Standby using the rear mounted Supply switch. Isolate the drive assembly from
the ac and/or dc supplies.
(12) Refit the drive assembly top and bottom covers. The drive assembly can now be returned to
service.
Removing and Refitting the Front Panel PCB
The Front Panel assembly is located as shown in
The Front Panel assembly is located as shown in
. An assembly and PCB removal diagram is
Dangerous voltage is present within the T6T VHF drive assembly. 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.
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 Front Panel PCB, ensure that the drive assembly is isolated from the
ac and dc input supplies. Disconnect the six Amplifier Out connectors, CN1 to CN6. Then proceed as
follows:
ac and dc input supplies. Disconnect the six Amplifier Out connectors, CN1 to CN6. Then proceed as
follows:
(1)
Remove the drive assembly top and bottom covers as described on
(2)
Disconnect CN4 at the Processor module. Carefully pull the cable through the aperture in the
mainframe to free it.
mainframe to free it.
(3)
Disconnect SMB connector CN5 at the PA Control module.
(4)
Remove the four M3 x 8 mm countersunk screws from the bottom and top of the mainframe box
section (see
section (see
, Diagram A).
(5)
Remove the two black equipment handles by unscrewing and removing the four M5 x 20 mm
panhead screws and wavy washers that secure them to the drive assembly. The front panel can
now be moved forward and away from the mainframe.
panhead screws and wavy washers that secure them to the drive assembly. The front panel can
now be moved forward and away from the mainframe.
(6)
At the front panel, release the control knob by unscrewing the Allen head grub screw using a
1.5 mm Allen key. Withdraw the control knob from the spindle.
1.5 mm Allen key. Withdraw the control knob from the spindle.
(7)
Remove the Front Panel PCB from the Front Panel assembly by removing the six M3 x 6 mm
panhead screws and wavy washers (see
panhead screws and wavy washers (see
Diagram B).
Refitting
To refit the Front Panel PCB, proceed as follows:
(1)
Place the PCB in position at the Front Panel assembly. Ensure the spindle of the control knob
and microphone/diagnostics connector are correctly located. Secure the PCB to the Front Panel
assembly using the six M3 x 6 mm panhead screws and wavy washers previously removed (see
and microphone/diagnostics connector are correctly located. Secure the PCB to the Front Panel
assembly using the six M3 x 6 mm panhead screws and wavy washers previously removed (see
, Diagram B).
(2)
At the front panel, place the control knob onto the spindle and using a 1.5 mm Allen key, secure
the Allen head grub screw.
the Allen head grub screw.
(3)
Secure the Front Panel assembly to the top and bottom of the mainframe box section using the
four M3 x 8 mm countersunk screws, previously removed. Fit the two black equipment handles
using the four M5 x 20 mm panhead screws and wavy washers previously removed (see
four M3 x 8 mm countersunk screws, previously removed. Fit the two black equipment handles
using the four M5 x 20 mm panhead screws and wavy washers previously removed (see
Diagram A).
(4)
Route the ribbon cable to the Processor module connector CN4 and connect it.
WARNING Dangerous Voltage