TB8100 Service Manual Control Panel Circuit Description 273
© Tait Electronics Limited September 2006
17.3 Power Save
This circuitry is present only on the Power Save control panel board.
When the base station enters Power Save mode, the control panel will shut
down after receiving the appropriate I
2
C bus message from the reciter. The
power LED flashes once every two seconds to indicate the base station is in
Power Save mode.
The control panel will power up again when it receives a signal on the
RS-232 system control bus or serial port.
17.4 Power Supply
Standard, Dual Base
Station, and Power
Save
The control panel operates off a 28V (nominal) power supply provided by
the reciter. The power supply for the cooling fans mounted on the front
panel is fed through the control panel.
Multi-reciter The control panel is powered from the subrack interconnect board. 28VDC
is supplied to the subrack board from the PMU (if fitted). If no PMU is
fitted, 10.5VDC to 32VDC is supplied to the subrack board from the DC
input connector at the rear of the subrack. The power supply for the cooling
fan (if fitted) mounted on the front panel is fed through the control panel.
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