CONTROL CIRCUITRY

TM 11-7025-210-23

The power control board also contains the motor circuits. The motor is fed from the line side of the RFI filter. The motor

circuit includes the motor relay and associated circuitry to reduce voltage transients generated by the relay contacts.

Thermal overload protection is internal to the motor.

The 157 volt power supply provides power to the +109 volt regulator found on the. PSR board. Fuse Fl provides protection

against failure of the +109 volt regulator.

The low voltage power supplies provide unregulated low voltage power to the low voltage regulators on the PSR board.

The +25 volt, -25 volt, and +10 volt unregulated power supplies the +15 volt, -15 volt, and +5 volt regulators (fig. 2-16). In

addition, -25 volt unregulated power is also used to supply the -12 volt regulator.

Figure 2-16. Power Supply Regulator (PSR/1) Circuit Board Indicators

2-6. CONTROL CIRCUITRY

The control panel circuit board (LCP/3) (fig. 2-17) seats and provides the interconnections for all pushbutton control

switches and indicators on the control panel.

Figure 2-17. Control Panel (LCP/3) Circuit Board

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