COMPONENT MAINTENANCE MANUAL
IN 1502H RADAR INDICATOR
TM109102
1-15
May/01
This input is controlled at the radar system control unit and is sent to the indicator via the
interface unit, or is activated by the composite video ENABLE input.
The +28-volt input is filtered and applied to output drivers, which are modulated by an
oscillator circuit. The fi28 volts is also applied to a 12-volt regulator, which
supplies the operating voltages for on-board integrated circuits; to the output drivers; and
to the driver circuit on the high-voltage regulator board.
The DC operating voltages for the indicator are tapped off from the secondary of a power
transformer, rectified, and routed to the various indicator circuits. A current limiting circuit
receives an input from a current sense transformer and shuts down the power supply in
the event of an overcurrent condition.
The +5-volt output is fed back to a regulator circuit, which contains the adjustment
potentiometer for +5 volts. The 5-volt output is fed to the horizontal sweep circuit, where it
is used to increase the switching speed at the start of X-retrace.
The +/-12-volt outputs are used throughout the indicator. The +/-9-volt outputs, derived
from the +12 volts, are tightly regulated and are used in those indicator circuits requiring a
precision voltage reference (e.g., cathode drives).
The +52 volt output is used at the video/RS-170 module in the video amplifier circuit and
at the sweep board in the horizontal and vertical sweep circuits.
The document reference is online, please check the correspondence between the online documentation and the printed version.
