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M2540-92000-01 A M2540 Ultrasound System Field Service Manual Page 49
Theory of Operation: Functional Block Diagrams
e-box and Power
Supply
Functional Block
Diagram
Figure 4-2 shows the system’s power supply and the e-box and their connections to each other
and other components.
Figure 4-2 e-box and Power Supply Block Diagram
Connector
module
Connector
module
Connector
module
Connector
module
Motherboard
Distribution board
Fan
TR board
TR board
Demodulator board
BPAP board
Token ring
To APIO board in PC
Power supply
Unswitched
120 VAC
To PC
Switched 120 VAC
Switched 120 VAC
To monitor
Switched 120 VAC
To peripherals
To system
control panel
+5, +12, -12 VDC
90 - 264 VA
C
Control
+2 VDC
+12 VDC variable
+11, +5
+60, -140
mux V
±12, -5,
±HV
+3, +5
VDC