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T6TR VHF 50 W Transceiver Page 18 Maintenance
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(10) Set the rear mounted Power switch to Standby. Isolate the transceiver from the ac and/or dc
supplies.
(11) Refit the transceiver’s top and bottom covers. The transceiver can now be returned to service.
Removing and Refitting the PA Module
The PA module is located as shown in Fig 8 . A module removal diagram is shown in Fig 13 .
Removal
Before attempting to remove the PA module, ensure that the transceiver is isolated from the ac and dc
input supplies. Then proceed as follows:
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.
When carrying out repairs to the PA module, care must be taken not to damage the gasket.
If the strips become damaged, they must be replaced. Failure to comply with this instruction
may compromise the transceiver’s Electromagnetic Compatibility (EMC) and breach
European Commission regulations.
When screws are inserted into the transceiver PA casting care must be taken not to exceed
a torque of 6 Ibs/inch when tightening. This applies when replacing the top and bottom
covers and during the refitting of the PA module.
(1) Remove the transceiver’s top and bottom covers as described on page 9 and page 13 .
(2) Remove CN3 from the PSU Regulator module.
(3) With the transceiver upside-down disconnect CN2 from the PA Control/Rx RF 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 transceiver.
(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 13 . 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.
WARNING Dangerous Voltages
Caution Repairs