M2540-92000-01 A M2540 Ultrasound System Field Service Manual Page 42
Theory of Operation: BPAP Board
BPAP BoardThe beam processor/acoustic processor (BPAP) board contains two processors. One of them
controls beam-forming, line-to-line operation. The other handles the processing of scan
conversion, color flow, and Doppler signals.
The BPAP board does the following:
•Provides the interface between the PC and the TR boards
•Provides the interface between the PC and the demodulator board
•Receives control data sets from the PC, processes them for specific register values, and
sends them to the TR boards
•Houses the transesophageal echo cardiography (TEE) transducer interface circuitry (TEE
motor control and temperature monitoring)
•Houses the transducer ID circuitry
•Detects the presence of standalone transducers
•Houses electronic switching that allows selection of a single active transducer from the four
that can be connected
•Controls the high-voltage output from the system power supply
Omni TEE
Circuitry
The Omni Probe control circuitry on the BPAP board supplies power to the TEE transducer's
motor. It also measures the position of the angle-position sensor. The signal is digitized and sent
to the APIO board for monitoring by the PC.
The beam processor circuitry monitors thermistors in the transducer and insures that high
voltage is not applied to the transmitter unless the thermistor values are within limits.