Siemens SC 7000 Service Manual page 32

Service Manual
Docking Station
PSL
MUX
Auxiliary
Battery
Main
Battery
On/Off
Figure 2-7 Power Conversion
5.2 Outputs
5.3 Error Handling
6 Power Conversion
6.1 Power Control
6.1.1 Power Buss
6.1.2 Control and Load
Sequencing
16
V Buss
Enable
Switches
Power
Status Control
Conversion
ASIC
The pod com subsystem has four channels. Channel A is dedicated to the
two internal front ends; the MultiMed and HemoMed. Channel B is
dedicated to the cartridge slot in the back of the unit. This connector does
not require patient isolation and has higher power than the pod com
connectors. Channels C and D are both used to communicate with external
pods. They have full patient isolation for both power and data.
The pod com channels provide error detection by performing CRC checks
on data in both directions. CRC errors are reported to the front end
processor through interrupts.
Refer to Figure 2-7.
Most monitor loads are powered from a DC power buss, called VBUSS,
within the monitor. VBUSS powers the +3.3VDC, +5.0VDC, ±12VDC,
+40VDC and charger power converters. VBUSS also powers the external
pods, cartridge, strip recorder and backlight. The NBP pump and valves as
well as the internal multimed and hemomed front ends are powered from
the regulated +12V supply.
The switching of the VBUSS power inputs and the power converters is
managed by the power supply gate array. This gate array controls the
power on and power off of the monitor, and the battery charging process.
Siemens Medical Systems, EM-PCS, Danvers
NOT A CONTROLLED DOCUMENT
SC 7000 and SC 9000XL Patient Monitors
+3.3V
+5.0V
+12VDC
±12V
+40V
+40V
Battery
Battery
Charger
Pod Com
Backlight
Cartridge
Recorder
Main Processor
7k9kXLTM.c2.CD_ROM.fm/04-99/kaupp
Computer
Section
MultiMed
Power
HemoMed
Power
NBP Pump
NBP Valves
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