AR 10044831, Operating And Service Manual

Page: 43 / 52

Model 175A400
Rev C 25
3.4 CONTROL SYSTEM
3.4.1 A12 Control/Fault Board (Schematic #10042218)
The A12 Control/Fault board consists of one 16-bit microcontrollers and several other ICs that monitor and
indicate the status of the amplifier. Power is supplied using only a single 5-volt power supply. The board
offers the following:
Feature Quantity
Open drain outputs 4
Digital outputs 6
Digital inputs (5-volt tolerant) 24
Analog outputs 2
2-channel encoder input 1
Inputs for a keypad 6
Display connectors 1
Serial communication jacks 2
3.4.2 A14 Interface Board (Schematic #10020073)