AR 10044778, Operating And Service Manual, Page: 43 / 54

Model 100U1000
Rev B 25
3.2.5 A8 Two-Way Combiner
A8 is a Two-Way combiner with impedance matching. The combiner operates in a zero-degree
configuration. The combiner is designed to tolerate loss of input signals at full output power.
3.3 POWER SUPPLIES (PS1, PS2)
Power supply PS1 supplies a +5VDC housekeeping supply for the control system assemblies A6
Control/Fault Board and A7 Interface Board.
PS1 also supplies -15 VDC at 2.5 amps. PS1 is a switching supply that automatically sets the AC input
circuits to the correct connections for the line voltage 100-240 VAC input ranges 47-440 Hz.
The -15 VDC at 2.5 amp power supply is fed to the A1 Pre-Amp, and A2 driver and A6 and A7 Power
Modules.
The +24 VDC at 7.5 amps power supply is fed to the B1 and B2 fan assemblies.
Power Supply PS2 is a single output supply which pr28 VDC to the A2 driver and A6 and A7 power
modules. Primary AC circuit protection is provided by the circuit breaker in the Power Entry Module.
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)