User's Manual

T6T VHF 100 W Transmitter Page 16 Maintenance
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Removing and Refitting the Combiner BIT Module
The Combiner BIT module is located as shown in Fig 5. The removal diagram is shown in Fig 12.
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 Combiner BIT module, ensure that the transmitter is isolated from the
ac and dc input supplies. Then proceed as follows:
(1) Remove the transmitter top and bottom covers.
(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
❑ CN14 6-way connector
❑ CN15 10-way connector
❑ CN16 SMB connector
❑ CN17 SMB connector
❑ CN18 SMB connector
❑ CN22 QMA connector
❑ CN23 QMA connector
❑ CN24 QMA connector
❑ CN25 SMB connector
❑ CN26 SMB connector
❑ CN27 SMB connector
(3) The Combiner BIT module is secured from both sides of the chassis thus requiring removal of
the Power Supply modules. Refer to page 14 and remove both Power Supply modules.
(4) Removal of the Power Supply modules will expose the six M3 x 6 mm countersunk screws that
secure the Combiner BIT module heatsink to the chassis. Remove these six screws.
WARNING Dangerous Voltages