Specifications

extended/remote control, a turn on signal from the Controller
will be applied to relay K5. K5 contacts will close and allow
single phase 230VAC to be applied to low voltage supply
transformers T6 and T7. At this time, the low voltage supplies
will be turned on and the transmitter will start the step start
sequence and turn on. When the transmitter is shut OFF, the
drive signal to K5 will be removed and the low voltage supplies
will be turned off.
When CB3 LV Supplies Enable is in the Normal position, single
phase 230VAC will be applied directly to T6 and T7 and the low
voltage supplies will turn on and stay on whether the transmitter
is on or off. The Normal mode should be used for initial turn on,
frequency change, or troubleshooting.
4.6.1.3 Low Voltage Power Supply A
Refer to Simplified Low Voltage Power Supply diagram Figure
4-7, and/or Power Supply Schematic (843-5155-552). The Low
Voltage Power Supply provides six different unregulated DC
voltages +8VDC, - 8VDC, +12VDC, -12VDC, +22VDC and
-22VDC. All transmitter logic and other circuits, except the
Buffer, Predriver, and RF Power Amplifiers, operate from the
Low Voltage supply.
Transformer T6 is a single phase transformer, with a tapped
primary winding for operation from different input voltages.
Circuit breaker CB4 protects the supply against overloads or
shorts on the supply output. T6 has a secondary winding with
taps to provide the different supply voltages.
The top winding provides 24 Volts AC to the AC input of bridge
rectifier CR43. The negative output of CR43 is connected to
filter capacitor C9, bleeder resistor R9, and is the -22VDC
output. The positive output of CR43 is connected to filter
capacitor C8 and bleeder resistor R8 and is the +22VDC output.
Figure 4-7. Simplified Low Voltage Supply
4-12 888-2339-002 12/16/03
WARNING: Disconnect primary power prior to servicing.