14 Maintenance Manual
4.1.7 The Daughter Board has:
The power interfaces from the offline power supply, and to the SBC.
The PC104 Buss interface from the SBC to three UARTS and two RS232 interfaces.
A microcontroller that interfaces between the SBC and the circuits on the Daughter
and the Connector Boards.
The Internal and external Keyboard interfaces.
The interface to the Connector Board.
The audio connector to and from the SBC.
The measurement microphones multiplexer, two channel prescalers, ANSI equalizers,
anti-aliasing filters, and the Mic/Line multiplexer.
The speaker current measurement.
4.1.8 The Front Panel Keyboard has:
Twenty-two rubber key switches.
The connector to the Daughter Board.
The Power and Standby LEDs.
4.1.9 The Connector Board has:
The interface to the Daughterboard.
Two channel source attenuators, power amps, and relays directing to module 1 or 2.
The Frye Peripheral Interface(FPI) connectors to Module 1 and 2.
Four channel differential measurement microphone signal receivers.
The Line input and Voice Microphone inputs.
The external keyboard connector.
The RS232 to USB device port circuits and connectors.
The dual USB Host pass through connectors.
4.1.10 The Chamber Board has:
The FPI connector from the Connector Board.
An RS232 interface between the FPI and the microcontroller.
A microcontroller that interfaces between the SBC and the circuits on this board.
Relays that direct the source signals to the speaker, telecoil, or telewand.
The 7020 connector, the connector to the Breakout Board, and the Telewand Jack.
The Chamber Microphone connector, Prescale amplifiers, and differential line driver.
The Battery Simulator circuits and the Battery Pill jack.
The Power/Status and White LED drivers, and the Power/Status LED.
The Turntable control lines and connector to the Turntable Board.
4.1.11 The Turntable Board has:
The connector from the Chamber Board.
The H-Bridge driver to drive the Stepper Motor.
The connector to the Stepper Motor and Shaft Encoder.
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