![background image](http://html.mh-extra.com/html/ge/001c-051d-003a/001c-051d-003a_service-manual_128510051.webp)
Equipment overview:
Theory of operation
2000966-542D
Dash 3000/4000/5000
2-31
Real-time clock
The real-time clock incorporates an on-board quartz crystal. This feature
simplifies the design and eliminates adjustments. The time of day on a
standalone patient monitor is maintained to an accuracy of 15 seconds in
24 hours to support 24 hour trend data. The RTC device is one of the
devices on the I
2
C bus.
Audio subsystem
Audio tones are generated using a tone generator, an audio amplifier,
and an 8
, 2.5-in. speaker. The tone generator has built in D/A
converters and a mixer to generate the dual frequency tones.
Frequencies ranging from 150 Hz to 2800 Hz are produced.
Video subsystem
The microprocessor contains a video controller that supports real-time
and non-real-time waveform drawing, menu drawing, and parameter
display.
Display brightness is controlled by a 50 k
digital potentiometer. The
potentiometer is interfaced to the brightness control input of an inverter.
Analog outputs
Two analog output channels support ECG and BP. The pace pulse is
generated on the main processor board and inserted into the analog out
ECG signal. The digital-to-analog conversion for both ECG and blood
pressure output signals are performed on the main processing board via
a two channel 12-bit serial DAC. Cal data is stored on the processor/
power management PCB.
Defib Sync
The QRS complex of ECG data acquired from the DAS generates the
marker-out signal. A software selectable pulse width and pulse
amplitude is provided in the Boot Loader Menu.
Summary of Contents for 001C 051D 003A
Page 10: ...viii Dash 3000 4000 5000 2000966 542D ...
Page 11: ...2000966 542D Dash 3000 4000 5000 1 1 1 Introduction ...
Page 20: ...Introduction Service information 1 10 Dash 3000 4000 5000 2000966 542D ...
Page 21: ...2000966 542D Dash 3000 4000 5000 2 1 2 Equipment overview ...
Page 64: ...Equipment overview Theory of operation 2 44 Dash 3000 4000 5000 2000966 542D ...
Page 65: ...2000966 542D Dash 3000 4000 5000 3 1 3 Installation ...
Page 73: ...2000966 542D Dash 3000 4000 5000 4 1 4 Configuration ...
Page 99: ...2000966 542D Dash 3000 4000 5000 5 1 5 Preventive maintenance ...
Page 117: ...2000966 542D Dash 3000 4000 5000 6 1 6 Troubleshooting ...
Page 146: ...Troubleshooting Wireless LAN 6 30 Dash 3000 4000 5000 2000966 542D ...
Page 147: ...2000966 542D Dash 3000 4000 5000 7 1 7 Field replaceable units ...
Page 201: ...2000966 542D Dash 3000 4000 5000 8 1 8 Functional and electrical safety checks ...
Page 257: ...2000966 542D Dash 3000 4000 5000 A 1 A Electromagnetic compatibility EMC ...
Page 267: ...2000966 542D Dash 3000 4000 5000 B 1 B Network troubleshooting ...
Page 279: ...2000966 542D Dash 3000 4000 5000 D 1 D Checklist ...
Page 281: ......