GE Medical Systems marquette Dash 2000, Service Manual, Page: 38 / 202

EQUIPMENT OVERVIEW: Theory of Operation
2-16 DASH 2000 Patient Monitor Revision A
2000 412-001
Power Supply PCB
Theory The power supply PCB mounts internally to the monitor rear casting
assembly. The input voltage is between 85Ð264 V AC / 49Ð64 Hz. The
power supply PCB provides a controllable output voltage between
12Ð16 V.
PCB Functions
The power supply PCB is a 40 W controllable single output, universal
input switching converter. The output voltage is controlled via control
voltage input (TB2, Pin 3).
The output voltage range is between 12Ð16 V, the control voltage range
is 0Ð16 V.
The output voltage with open control input is 15.5 V ± 100 mV.
PCB Block Diagram
TB1
L
N
100 – 240 Vac
(
±
10%)
49 – 65 Hz
T2.0A 250 VAC
(5 x 20 mm)
T2.0A 250 VAC
(5 x 20 mm)
TB2
1
2
3
5
4
6
Output
voltage
12 V – 16 V
Control voltage
0 – 16 V
40 W