User's Guide

T6T 50 W VHF Transmitter Page 14 Maintenance
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(7) Slide back the terminal block cover and disconnect the ac wires from the three connector terminal
block (marked L N E).
(8) Carefully remove the power supply from the transmitter.
Refitting
(1) With the transmitter on its side hold the power supply near to its securing position in the top half
of the radio.
(2) Slide back the terminal block cover and connect the ac wires to the three connector terminal
block (marked L N E); brown to terminal L, blue to terminal N and yellow/green to terminal E.
(3) Connect the dc wires to the eight connector terminal block; red to terminal 2 and terminal 3 and
black to terminal 6 and terminal 7.
(4) Connect connector CN4.
(5) Taking care not to damage the plastic supply guard, lower the power supply into position and
secure from the bottom half of the unit using the four countersunk screws.
(6) Re-establish the ac and/or dc supplies.
(7) Switch power on at the radio using the rear mounted Power switch.
(8) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(9) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.
(10) Switch power off at the transmitter using the rear mounted Power switch. Isolate the transmitter
from the ac and/or dc supplies.
(11) Refit the transmitter’s top and bottom covers. The transmitter can now be returned to service.
Removing and Refitting the PA Module
The PA module is located as shown in Fig 3. A module removal diagram is shown in Fig 8.
Removal
Before attempting to remove the PA module, ensure that the transmitter is isolated from the ac and dc
input supplies. Then proceed as follows:
(1) Remove the transmitter’s top and bottom covers as described on page 9 and page 12 (take heed
of the warnings on those pages).
(2) Remove CN3 from the PSU Regulator module.
(3) With the transmitter upside-down disconnect CN2 from the PA Control module.
(4) Disconnect the SMB connectors CN8 and CN10. Note that CN10 is located within the heatsink
fins and should be disconnected using long nosed pliers. Do not attempt to remove the connector
by pulling on the cable.
(5) Remove the black equipment handle from the PA side of the radio by unscrewing and removing
the two M5 x 16 mm panhead screws that secures it to the transmitter.
(6) Remove the six M3 x 8 mm countersunk screws and two M3 x 8 mm captive screws that secure
the PA from the bottom and top of the mainframe as shown in Fig 8. Ensure the PA module is
well supported during this operation.
(7) Withdraw the PA module from the mainframe taking care not to snag the wiring looms.