User's Manual Part 2
Table Of Contents
- Maintenance
- Introduction
- Scheduled Maintenance
- Unscheduled Maintenance
- Introduction
- Tools, Materials and Test Equipment Required
- T6T VHF Amplifier Procedures
- Top and Bottom Covers
- Removing and Refitting the Interface Module
- Removing and Refitting the PSU Regulation Module
- Removing and Refitting the Power Supply Modules
- Removing and Refitting the Combiner BIT Module
- Removing and Refitting the PA Modules
- Removing and Refitting the Front Panel PCB
- Removing and Refitting the Cooling Fans
- T6T VHF Drive Assembly Procedures
- Removing the Top Cover
- Removing and Refitting the Processor Module
- Removing and Refitting the PSU Regulation Module
- Removing and Refitting the Drive Module
- Removing the Bottom Cover
- Removing and Refitting the PA Control Module
- Removing and Refitting the Power Supply
- Removing and Refitting the Front Panel PCB
- Virtual Front Panel (VFP)
T6T 300 Watt VHF Transmitter Page 110 Maintenance
(3) Connect the dc wires to the eight connector terminal block, red to terminal 1 and terminal 2 and
black to terminal 5 and terminal 6.
(4) Connect 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 two countersunk screws, previously removed, for
each power supply.
(6) Connect the drive assembly cables at CN5 and CN8. Connect the antenna cable to the
Combiner.
(7) Re-establish the ac and/or dc supplies.
(8) Switch power on at the amplifier using the rear mounted Supply switch.
(9) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(10) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 102.
(11) Set the rear panel Supply switch to Standby. Isolate the amplifier from the ac and/or dc supplies.
(12) Refit the amplifier top and bottom covers. The amplifier can now be returned to service.
Removing and Refitting the Combiner BIT Module
The Combiner BIT module is located as shown in Fig 34. The removal diagram is shown in Fig 40.
Dangerous voltage is present within the T6T VHF amplifier. 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 Combiner BIT module, ensure that the amplifier is isolated from the ac
and dc input supplies. Disconnect the drive assembly cables at CN5 and CN8. Disconnect the antenna
cable to the Combiner. Then proceed as follows:
(1) Remove the amplifier top and bottom covers as described on page 106.
(2) Locate the Combiner BIT module and disconnect the following connectors:
❑ CN1 4-way connector
❑ CN2 3-way connector
❑ CN3 4-way connector
❑ CN4 3-way connector
❑ CN5 3-way connector
❑ CN6 3-way connector
❑ CN7 8-way connector
❑ CN10 3-way connector
❑ CN11 3-way connector
❑ CN12 6-way connector
❑ CN13 6-way connector
WARNING Dangerous Voltage