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It can be seen that the micro-controller is the heart of the control system, to which the various peripherals
(power supply, serial ports, telemeasure socket, AGC port, RF amplifier module, ROM, clock, display and
keys) are interfaced.
- Power Supply
The board is powered with a continuous +24V voltage applied on the J14 connector. From that the +5V
voltage, powering the most of the chips (micro-controller, operational amplifiers, display, etc.) is derived by
means of a switching converter (see IC19). A +12Vdc voltage is obtained from it as well, by means of a linear
conversion provided by the integrated circuit IC8. From this, a -12Vdc voltage is obtained by means of the
integrated circuit IC5. The -12V voltage is used to adjust the contrast of the display.
- Connectors
On the board SCH0223A there are several connectors used as interfaces for the peripherals of the apparatus
and the ports for external communication.
POWER SUPPLY
The connectors J1, J6, J8 e J12 are used to connect the power supply powering the RF modules. The number
of power supply used changes depending on the amplifier, up to eight power supply. They are connected in
the order shown in Table 1 below. Remaining connectors, if any, are left unconnected.
Through this connection, each power supply provides the level of voltage and current acquired by the micro-
controller by means of an internal ADC. Besides the connectors allow the control board to turn on or off the
individual power supply (for instance when an alarm occurs).
RF AMPLIFICATION
The J3 connector interfaces the control board with the RF amplification section. Through this connector the
120
CONNECTOR
J1
J6
J8
J12
Table 1: Interface connectors for the power supply
POWER SUPPLY N°
1 - 2
3 - 4
5 - 6
7 - 8
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