M2540-92000-01 A M2540 Ultrasound System Field Service Manual Page 39
Theory of Operation: Internal PC
Internal PC
The M2540A uses an internal PC to coordinate and perform many of the functions that required
dedicated circuit boards in earlier ultrasound systems. The power button on the front of the PC
is the system power switch. Turning on the PC starts the ultrasound system.

Standard PC

Components

The M2540A’s internal PC contains the following standard components:
•A motherboard
•A hard drive
•A graphics card in the AGP slot
•The Acoustic Processor I/O (APIO) board, in a PCI slot (See “APIO Board” on page 43)
•A 31/2-inch floppy disk drive
•A CD-RW drive

PC Ports

The PC motherboard’s ports are used as follows:
•A USB port communicates with the system control panel.
•A USB port communicates with an optional black-and-white thermal printer.
•A USB port communicates with an optional color printer.
•A USB port communicates with an optional plain-paper printer.
•A USB port communicates with the optional physio module.
•A LAN port connects the PC to a network.
•A 3.5 mm phono jack receives audio signals from a microphone.
•A 3.5 mm phono jack supplies the signal that drives the system’s speakers.
•An RS-232 port (Com1) controls an optional VCR.