Siemens SC6002XL, SC6802XL Service Manual

s

SC 6002XL Patient Monitor

Field Service Manual

EM Guidelines, 1997-04-02

E331.E551U.719.01.01.02

Replaces/Ersetzt:

ASK-T941-04-7600

ADVISORY

Siemens is liable for the safety of its equipment only if maintenance, repair, and modifications are performed by authorized personnel, and if components affecting the equipment's safety are replaced with Siemens spare parts.

Any modification or repair not done by Siemens personnel must be documented. Such documentation must:

•be signed and dated

•contain the name of the company performing the work

•describe the changes made

•describe any equipment performance changes.

It is the responsibility of the user to contact Siemens to determine warranty status and/or liabilities if other than an authorized Siemens Service Representative repairs or makes modifications to medical devices.

Field Service Manual	SC 6002XL Patient Monitor

Table of Contents

Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1	Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		1
	1.1	Service Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1
	1.2	Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1
	1.3	Technical Manual Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1
2	Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		2
	2.1	Monitored Patient Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2
	2.2	SC 6002XL Monitor Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2
	2.3	TFT-LCD Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2
	2.4	Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
	2.5	Monitor/Software Tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
3	Preventative Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		3
	3.1	General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
	3.2	Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
4	Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		4
	4.1	General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
		Table 1-1 General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
	4.2	Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
		Table 1-2 Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
	4.3	Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
		Table 1-3 Display Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	4.4	Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
		Table 1-4 Output Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	4.5	Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
		Table 1-5 Connector Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
5	Monitor Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		6
	5.1	Main Screen Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	5.2	Menu Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	5.3	Alarm Limits Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	5.4	Alarm Silence Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	5.5	All Alarms Off Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	5.6	NBP Start/Stop Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	5.7	Zoom Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	5.8	Record Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7

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Field Service Manual	SC 6002XL Patient Monitor

Chapter 2: Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 2-1 SC6002XL Patient Monitor Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2 Parameter Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3 Main PC Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1 LCD Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2 Network Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.3 Front Panel Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.4 Pod Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.5 Battery Control and ON/OFF Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.6 BOOT Process, Flash Memory, and DRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.7 SRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.8 68HC11 Microcontroller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4 Front End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.1 NIBP Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 2-2 Front End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5 Physiological Parameter Data Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.1 ECG/Resp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 2-1 Parameter Sampling Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.1 ECG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 2-3 Lead-Forming Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.1.2 Lead Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.1.3 Lead-Off Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.1.4 Low-Pass Filtering and Common Mode Enhancement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2 Respiration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 2-4 SpO2 Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.3 SpO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.3.1 SpO2 Front End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 2-5 Sensor LED Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.3.2 Input Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.3.3 Brightness Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.3.4 Ambient Light Rejection Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 2-6 IBP Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.4 Invasive Blood Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.5 Non-Invasive Blood Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.5.1 NBP Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 2-7 NBP Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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5.5.2 NBP System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.5.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.5.4 NBP Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.5.5 Valve Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.5.6 Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.5.7 Power Supply Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.5.8 Safety Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.5.9 Pressure Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 2-8 Temperature Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.6 Temperature Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.6.1 Reference Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.6.2 A/D Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Figure 2-9 etCO2 Sensing Process Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 6 etCO2 Pod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Figure 2-10 Power System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6.1 Power Supply System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6.1.1 Main Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6.1.2 AC Power Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Chapter 3: Subassembly Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . .				25
1	Introduction		. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	25
2	Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			25
3	Service Policy and Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			25
4	Non-Invasive Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			26
	4.1	Replacing Rotary Knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		26
	4.2	Replacing Foot Pads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		26
5	Accessing Replaceable Subassemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			26
	Figure 3-1		Right Side Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26
	5.1	Removing Side Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		26
		5.1.1	Removing Right-Hand Side Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27
	Figure 3-2		Removing Left Side Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27
		5.1.2	Removing Left Side Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27
		5.1.3	Reinstalling Side Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
	Figure 3-3		Bezel Retaining Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
	5.2	Front Bezel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		28
	Figure 3-4		Front Bezel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
	5.3	Replacing Optical Encoder Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		29
	Figure 3-5		Optical Encoder Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29
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5.4		Front Bezel Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . . . . . . . . . 30
	Figure 3-6		TFT-LCD Display Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 30
5.5		Removing/Installing TFT-LCD Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . . . . . . . . . 30
		5.5.1	Removing TFT-LCD Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 30
		5.5.2	Installing TFT-LCD Display Subassembly . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 31
	Figure 3-7		Speaker Subasssembly Connector . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 31
5.6		Speaker Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . . . . . . . . . 31
	Figure 3-8		TFT-LCD Display Subassembly (Back View). . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . 32
5.7		Front Panel PC Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . . . . . . . . . 32
5.8		Inverter Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . . . . . . . . . 32
	Figure 3-9		Backlight Retaining Tabs Location . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 33
5.9		TFT-LCD Display Backlight Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . . . . . . . . . 33
	5.10PodPort PC Board Removal/Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 33
		5.10.1 Removing PodPort PC Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . . . . . . . . . 33
	Figure 3-10 Removing PodPort PC Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 34
		5.10.2 Installing PodPort PC Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . . . . . . . . . 34
	Figure 3-11 Removing Intermediate Subassembly . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 35
	5.11Replacing Intermediate Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 35
		5.11.1	Removing Intermediate Subssembly . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 35
		5.11.2	Installing Intermediate Subssembly . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 35
	5.12Replacing Main Processor Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 36
		5.12.1 Removing Main Processor Subassembly . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . . . . . . . . . 36
	Figure 3-12 Securing Screw Access Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 36
	Figure 3-13 Accessing Main Processor Subassembly . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 36
	Figure 3-14 Connector Locations on Main Processor Subassembly . . . . . . . . .			. . . . . . . . . . . . . . . . 37
		5.12.2 Installing Main Processor Subassembly . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . . . . . . . . . 37
	5.13Monitor Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 38
		5.13.1	Removing Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 38
	Figure 3-15 Removing Handle retaining Plate . . . . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 39
		5.13.2	Installing Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 39
	Figure 3-16 Location of NBP Subassembly in Rear Housing . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 40
	5.14Replacing NBP Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 40
		5.14.1	Removing NBP Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 40
		5.14.2	Installing NBP Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 40
	5.15Replacing NBP Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 41
	Figure 3-17 NBP Air Intake Filter Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 41
		5.15.1 Replacing Air Intake Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . . . . . . . . . . . 41
	Figure 3-18 NBP Manifold Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . .			. . . . . . . . . . . . . . . . 42
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5.15.2 Replacing Manifold Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.16Replacing Battery Connector Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Figure 3-19 Battery Connector Subassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Figure 3-20 Battery Connector Subassembly Access Inside Rear Housing . . . . . . . . . . . . . . . . . . . . 43 5.17Correcting Hardware Revision Number Stored in Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.17.1 Windows 3.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.17.2 Windows 95 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.17.3 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Figure 3-21 Support Menu (Item numbers may differ in different versions of installed software.) . . 45

Chapter 4: Functional Verification and Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

1 Functional Verification Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 1.1 Power Circuits and Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 1.2 Optical Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 1.3 TFT-LCD Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 1.4 Fixed Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 1.5 ECG/RESP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 1.6 Asystole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 1.7 SpO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 1.8 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

1.8.1 Functional Verification Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 1.8.2 Temperature Calibration Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Table 4-1 Resistance Value vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 1.9 etCO2 (if installed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Figure 4-1 Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

1.10Non-Invasive Blood Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 1.10.1 System Setup and Pneumatics Leakage Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 1.10.2 Functional and Calibration Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Figure 4-2 IBP Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 1.11Invasive Blood Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 2 Leakage Current Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Table 4-2 Leakage Current Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Figure 4-3 Block Diagram: Earth Leakage Current (AC/DC Power Adapter) . . . . . . . . . . . . . . . . . . . 56 Figure 4-4 Block Diagram: Earth Leakage Current (CPS/Docking Station) . . . . . . . . . . . . . . . . . . . . 56 Figure 4-5 Block Diagram: Earth Leakage Current (Infinity Docking Station) . . . . . . . . . . . . . . . . . . 56

3 Calibrating NBP System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Table 4-3 NBP Calibration Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

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3.2 Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Figure 4-6 Calibration Potentiometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 3.3 Characterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Figure 4-7 NBP Characterization Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 3.3.1 Characterization Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 3.3.2 Windows 3.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 3.3.3 Windows 95 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 3.3.4 Complete Characterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Figure 4-8 Support Menu (Item numbers may differ between versions of installed software.) . . . . 61

Chapter 5: Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .			63
1.1	Power Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		63
	1.1.1	No Response When POWER ON/OFF Key Pressed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	63
	Table 5-1 Power-On Problems		63
	1.1.2	Power On/Off Piezo Tone Fails to Sound. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	65
	Table 5-2 Power-off Alarm Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		65
	1.1.3	Power-Up Sequence Fails to Complete Properly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	65
	Table 5-3 Power-up Process Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		65
1.2	Optical Encoder Malfunction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
	Table 5-4 Rotary Knob Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		65
1.3	TFT-LCD Display Malfunction.Fixed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		65
	Table 5-5 LCD Display Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		65
1.4	Fixed Key Fails to Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		66
	Table 5-6 Fixed Key Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		66
1.5	Visual or Audible Alarm Reporting Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		66
	Table 5-7 Alarm Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		66
1.6	NBP Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		67
	Table 5-8 NBP Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		67
1.7	etCO2 Malfunction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
	Table 5-9 etCO2 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		67
1.8	No Printout from Recorder. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
	Table 5-10Recorder Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		68
1.9	Isolating Cable Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		69
1.10Patient-Related Data Not Retained or Monitor Fails to Compute Trends . . . . . . . . . . . . . . . . . . . . .			69

Appendix A: Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		71
Table A-1 SC 6000XL - Replaceable Parts and Subassemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . .		72
Figure A-1 SC 6002XL Exploded View		73
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Figure A-2 NBP Subassembly (shown with filters exposed) . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 73
Appendix B: Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . 75
Figure B-1 IBP Connector (see Table B-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 75
Figure B-2 MultiMed Pod Connector (see Table B-2) . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 75
Table B-1 IBP Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 75
Table B-2 MultiMed Pod Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 75
Figure B-3 Docking Station Connector (see Table B-3) . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 76
Figure B-4 SHP ACC CBL ALARM UNTERM 5M (see Table B-4) . . . . . . . . . .	. . . . . . . . . . . . . . . . 76
Table B-3 Docking Station Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 76
Table B-4 Remote Alarm Cable Color Code . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 76
Figure B-5 Interface Plate Connector (see Table B-5) . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 77
Figure B-6 SHP ACC CBL Y RECORDER/ALARM (see Table B-6) . . . . . . . . . .	. . . . . . . . . . . . . . . . 77
Table B-5 Interface Plate Connectors Pinouts . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . 77
Table B-6 Remote Alarm Cable Color Code . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 77
Figure B-7 Basic/Device CPS Connectors - Infinity Network (see Table B-7) . .	. . . . . . . . . . . . . . . . 78
Table B-7 InfinityNet CPS Connector Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 78
Figure B-8 Infinity Docking Station Connectors(Refer to Table B-8.) . . . . . . . .	. . . . . . . . . . . . . . . . 79
Table B-8 Infinity Docking Station Connectors . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 79
Figure B-9 PodPort Connector (see Table B-9) . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 80
Table B-9 PodPort Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . 80

Appendix C: Error and Diagnostic Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 1.1 Startup Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 1.2 Diagnostic Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 Table C-1 Support Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 1.3 Severity Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

1.4 Reset Causes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 2 Diagnostic Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Table C-2 Startup Diagnostic Log Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Table C-3 Exception Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 Table C-4 Hardware-related Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 Table C-5 Intertask Mail Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Table C-6 Miscellaneous Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Table C-7 Alternative Memory Manager to PSOS OSL Messages . . . . . . . . . . . . . . . . . . . . . . . . . 86 Table C-8 NP Subsystem Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 Table C-9 Diagnostic Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 Table C-10INTER Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 Table C-11Print Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

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Table C-12MAIN Processor Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Table C-13ACT Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Table C-14Audio Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Table C-15Database Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Table C-16Front End Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Table C-17Alarm Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Table C-18Monitoring Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Table C-19SpO2 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Table C-20HCOM Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Table C-21LCOM Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Table C-22NET Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Table C-23etCO2 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Appendix D: Functional Verification Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	105
Appendix E: Supplemental Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	107
Software Installation Instructions - Software Version VE0 . . . . . . . . . . . . .	109
Service Setup Instructions - Software Version VE0 . . . . . . . . . . . . . . . . . . .	110

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Chapter 1: Introduction

1 Introduction

1.1 Service Strategy

1.2 Replaceable Parts

1.3Technical Manual Conventions

In keeping with the service strategy for the SC6002XL, this service manual provides the necessary information required to service an SC 6002XL patient monitor in the field. The SC 6002XL is both a stationary and a portable monitor designed to monitor patient vital signs (refer to user’s guide for monitoring options). For stationary operation near a bedside, the monitor is connected to an AC/DC power adapter or placed on a specially designed docking station attached to a shelf, wall, or rolling stand that securely locks it into place. While on the docking station, the monitor is powered by a CPS or an IDS power supply. When the monitor is detached from a CPS or IDS, it is powered by a lead acid battery or by an optional Lithium ion battery. The monitor is reattached to the AC/DC Power Adapter or placed back on a CPS or IDS to recharge the battery.

The monitor has been designed for high reliability, with an estimated MTBF of 50,000 hours (5.7 yrs.) of continuous operation.

Therefore, the service strategy is based on few failures in the field, a clear definition of failure analysis by field service personnel, and a quick repair turnaround. The field repair philosophy is based on the distributed and approved spare parts list. Refer to Appendix A: Replaceable Parts.

This manual is intended to serve as a source of technical information, for qualified field service personnel to use in servicing SC6002XL patient monitor in accordance with the Siemens Service Strategy. Field service is expected to be successful “First-Time Every Time.”

SC 6002XL monitors have several replaceable subassemblies, each of which also has replaceable subassemblies and/or components.

•Front Bezel Subassembly

•Front Panel PC Board

•TFT-LCD Display Subassembly,

•Main Processor Subassembly,

•NBP Subassembly, and

•Rear Housing Subassembly with integrated serial number chip.

Individual “consumable” replaceable parts include the battery, fluorescent backlight, and NBP filters. A complete listing of spare parts is included in Appendix A: Replaceable Parts of this manual. Replacement of components other than those listed in Appendix A should be performed only at Siemens service depots in Danvers, MA, U.S.A. or in Solna, Sweden, where specialized repair and testing equipment can assure product reliability.

The following conventions are employed in this manual:

A NOTE calls attention to items of special interest or provides additional related information about a specific topic:

Note: Attempting to repair any PC board to the component level may void any warranty, either express or implied.

A Caution indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate property damage. It may also alert against unsafe practices.

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Caution	3

Printed circuit boards in these monitors contain components that are easily damaged by static electricity. Open monitors only in a static-protected environment. Observe proper procedures to prevent damage to the equipment resulting from static discharge.

A Warning indicates a potentially hazardous situation which, if not avoided, may result in death or serious injury.

2 Product Overview

Warning

Do not operate this product in the presence of flammable gasses or liquids. If this device is operated where flammable anesthetics, skin cleansers, or disinfectants are used, the possibility of an explosion cannot be excluded. This product must be operated only in strict conformance with local fire prevention regulations.

SC 6002XL Patient Monitors are light-weight, battery-equipped, hand-held or semi-permanently mounted devices for general purpose monitoring of a preconfigured set of physiological parameters. When not connected to a hospital’s main ac power, they use a battery with approximately 1¼ hours (3 hrs. for Li option battery) of operating time. A power adapter, CPS/ docking station combination, or IDS, which also charges the battery, can be used to operate the monitor from the hospital’s main ac power circuit.

2.1Monitored Patient Parameters

The SC6002XL monitors the following physiological parameters:

• ECG (three-lead, five-lead, or six-lead pod)

•Respiration

•Pulse Oximetry (SpO2 and PR)

•Temperature

•NBP

•IBP1, IBP2 (locked option)

•etCO2 via PodComm Port (locked option)

•Arrythmia

•OCRG (locked option)

•Dual Lead S-T Segment Analysis (locked option, ≥ VF0 SW required)

2.2SC 6002XL Monitor All functions are controlled by a 16-position rotary knob and nine front

Controls	panel fixed keys - Alarm Silence, Record, Alarm Limits, NBP Start/Stop, All
	Alarms Off, Zoom, Main Screen, Menu, and ON/OFF. Turning the rotary
	knob locates different menu items, and pressing the knob in selects the
	item. Depending on the item selected, pressing the knob in may either
	bring up another menu or initiate an action. See Section 5. For detailed
	operating instructions, consult the SC 6002XL Patient Monitor User Guide
	applicable to the installed software.

2.3 TFT-LCD Display

The SC 6002XL monitor has a 6.5 inch (16.5cm), 3-channel color TFT-LCD display. Waveforms display in Erase Bar mode at 25 ±20% mm/s (except for respiration and etCO2 waveforms which display at 6.25 ±20% mm/s). All displays for a given parameter (label, unit of measure, and waveform) are in the same color. If a waveform is not displayed for a parameter, its label is gray.

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2.4	Alarms	Alarm limits can be set either on a user-definable setup table, or
		automatically based on current parameter values. Three alarm grades,
		each with a distinct alarm tone, announce alarm situations of varying
		severity:
		• life-threatening (asystole or ventricular fibrillation - red)
		• serious (parameter limit alarms - yellow)
		• advisory (technical alarms - white)
		The message field background and parameter field of the parameter in
		alarm are displayed in the color associated with the alarm grade as given
		above.
2.5	Monitor/Software	Each monitor has a unique ID chip installed in its rear housing for diagnostic
	Tracking	and tracking purposes, and un/locking optional software features.

3Preventative Maintenance

3.1	General	SC 6002XL monitors require replacement of the lead-acid battery (12 months),
		NBP air intake filter (24 months) and fluorescent bulb (45K - 50K hours).
		Siemens recommends that a full functional verification be performed
		annually. See Chapter 4: Functional Verification and Calibration. Also, some
		national jurisdictions require that a temperature calibration (see Section
		1.8.2 in Chapter 4) and an NBP calibration be performed at least every two
		years. Refer to Section 3, Calibrating NBP System in Chapter 4 for the NBP
		calibration procedure.
			Note: Replace the internal manifold filter on the NBP subassembly
			only if the NBP subassembly should fail characterization.
3.2	Battery	To obtain maximum life from a new lead-acid battery, install the battery
		into the monitor and run the monitor on battery power for a period of 15
		minutes. After the 15 minute period, either plug in the monitor’s power
		adapter or lock the monitor onto a powered docking station and charge the
		battery, or remove the battery from the monitor and connect the battery to
		an external charger. (This initial sequence is not needed for Li batteries.)
		When in storage or not in use for an extended period of time, lead-acid
		batteries self-discharge and develop a “float-charge” as a characteristic of
		the self-discharge process. The “float charge” must be drained off before
		the battery can be properly charged. If a new battery is immediately placed
		on a charger, the “float charge” provides an incorrect indication of the
		battery’s charge condition, and the charger may not fully charge the battery.
		Between discharges, the lead-acid battery must be recharged as soon as
		possible. Once charged, it can be stored for ª 4 months without recharging.
		Siemens recommends that the battery charge be maintained at >80% to
		maximize the battery’s capacity and cycle life. Starting at a 100% charge
		level, at room temperature the battery will self-discharge below the
		acceptable minimum in about 6 months on a shelf and in about 2 months
		in an unpowered spare monitor.
			Warning
			Dispose of used batteries in accordance with local regulations
			governing disposal of hazardous materials.
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4 Technical Data

Technical Data included in this Section is as of publication date of this Manual. Changes are reported in User Guide applicable to installed SW.

4.1 General

Table 1-1 General Specifications

Parameter	Specification
Power Requirements	100-250 VAC through AC power adapter
Mains Frequency	50/60 Hz
AC Power Consumption	60 VA AC
Battery Type	Lead-acid: PANASONIC LC-T121R8PU or equivalent
	Lithium-ion: Siemens Li+ Battery Pack
DC Input	11 - 14 V; 32 W continuous, 49 W peak
Battery Operating Time (means	Lead-acid: 75 mins
running with NBP measurement	Lithium-ion: 180 mins
every 15 min @ 25°C temperature,
no etCO2 running
Battery Recharging Time	Lead-acid: 5 ½ hours, typical
	Lithium-ion: 8 hours, typical
Battery Charge/Discharge/Charge:	Lithium-ion only (operating as defined above): 2 hours, charging for 2
	hours, operating 2 hours
Patient Leakage Current	< 10 µA @ 110 V and 60 Hz (per UL 544)
	< 10 µA @ 220 V and 50 Hz (per IEC 601-1)
Chassis Leakage Current with	< 100 µA @ 110 V and 60 Hz (per UL 544)
battery eliminator	< 500 µA @ 220 V and 50 Hz (per IEC 601-1)

4.2 Environmental

Table 1-2 Environmental Specifications

	Parameter		Environmental Specification
	Cooling Method		Convection and cooling chimney (no fan)
	Temperature:
	Operating		0°C to +40°C (without recorder)
	Storage		-20°C to +50°C
	Relative Humidity:
	Operating		>30% and <95%, non-condensing
	Storage		>10% and <95% non-condensing
	Altitude:
	Operating		-381 to +3048 m (-1250 to 10,000 ft.)
			525 to 795 mmHg (70.0 to 106 kPa)
	Storage		-381 to 5486 m (-1250 to 18,000 ft.)
			375 to 795 mmHg (50.0 to 106 kPa)
	Water Resistance		Drip-Proof
	Dimensions (H x W x D):		196 x 223 x 134 mm (7.7 x 8.8 x 5.3 in) (w/ rotary knob)
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		Table 1-2 Environmental Specifications (Continued)
			Parameter		Environmental Specification
		Weight:
			SC 6002XL (w/o etCO2)		3.42 kg (7.54 lb) w/ lead-acid battery
					3.22 kg (7.10 lb) w/ lithium-ion battery
					2.87 kg (6.32 lb)) w/o battery
			Battery		Lead-acid: 0.55 kg (1.22 lb)
					Lithium-ion: 0.35 kg (0.78 lb)
		Finish:			Front: white
			according to Siemens		Rear and Handle: anthracite gray
			Corporate Design Guidelines		Material: ABS Polycarbonate Blend (injection molded plastic)
4.3			Display
		Table 1-3 Display Specifications
			Parameter		Specification
		Type			Color Thin Film Transistor - Liquid Crystal Display (TFT-LCD)
		Size			170 mm (6.7 in) diagonal
		Resolution			640 x 480 pixels
		Active Viewing Area			132.5 x 99.4 mm
		Pixel pitch			0.207 mm x 0.207 mm
		Sweep Speeds			fixed 25 mm/s ±20% for ECG, SpO2, and IBP curves
					fixed 6.25 mm/s ±20% for Rsp and etCO2 curves
		Display Mode			Erase bar (updates waveforms from left to right)
4.4			Outputs
		Table 1-4 Output Specifications
			Parameter		Specification
		QRS Synchronization:
			Timing:		For heart rates from 30 to 250 [1/min], with QRS widths from 40 to 120
					msec and QRS amplitudes from 0.5 to 5 mV, a sync pulse is delayed no
					more than 35 msec from peak of R-wave for each valid QRS complex.
			Output Pulse:		+12 V, 100 ms duration
		Alarm Output			12 V Open collector output for external alarm indicator
		Recorder			UART interface w/ recorder through interface plate or docking station
					connector
		Debug Port			UART interface w/ a PC to retrieve diagnostic information through
					interface plate or docking station connector
		External VGA			Video signals sent to external VGA display for remote viewing of
					SC6002XL screen. -- not available when Infinity Serial Hub interface plate
					in use.
		Export Protocol			UART interface w/ external devices using proprietary export protocol. --
					not available when Infinity Serial Hub interface plate in use.
		Network			Serial connection to Infinity Network through Infinity Serial Hub interface
					plate or docking station connector.
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4.5 Connectors

Table 1-5 Connector Specifications

Parameter	Specification
DC Input	Siemens 2-pin power connector
Docking Station	Siemens 28-pin connector to provide Alarm Output, Recorder, Debug
	Port, Network, External VGA and Power
Memory Card	PCMCIA slot
QRS Sync	Phone jack connector
MultiMed Pod	16-pin shielded female input connector
IBP	7-pin shielded female input connector
NBP Hose	One-hand coupling system
etCO2	7-pin shielded female PodComm connector

Note: For patient parameter specifications, refer to User Guide applicable to installed software version.

5 Monitor Controls

5.1Main Screen Key

5.2Menu Key

The rotary knob in the lower right corner of the front panel is a pointing and selecting device. Turn the knob to select a screen area or menu item or to change a default value, and press the knob in to confirm your selection and to set a default value. Press Main Screen key to return to the MAIN screen.

Note: Instructions in this chapter are intended to provide only a cursory overview of basic monitor controls for accessing and performing service-related functions. Refer to the User Guide for the installed software version for complete operating information.

Pressing the Main Screen key exits the current menu or screen and displays the home screen.

--provides access to the Main menu. In general, functions of direct concern to the CSE or Biomed are accessed via Monitor Setup → Biomed on the Main menu. Password-protected service-related functions are to be performed by only authorized technical personnel. Use Biomed password (375) to access the following:

•Save Setups - Confirm or Cancel

•Locked Options - four locks into which monitor-specific 2-digit codes must be entered to enable locked options

•Diagnostic Logs

•Units

-Temperature - °C or °F

-Pressure - mmHg or kPa

•Service - requires Service password. (The password is given on the Service Setup Instructions for the installed software version.)

-Update Software

-Line Frquency - set the frequency equal to the ac mains line according to local conditions (50 or 60 Hz).

Note: An incorrect setting of line frequency can cause artifact or excessive waveform noise on the ECG waveform.

-Language - selection appropriate for clinical site

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5.3Alarm Limits Key

5.4Alarm Silence Key

5.5All Alarms Off Key

5.6NBP Start/Stop Key

5.7Zoom Key

5.8Record Key

-Test Pulse - Confirm or Cancel, one-shot test pulses for ECG (1mV spike) and Temp (–5°C and +50°C, respectively). An

additional test is performed for IBP, Resp Pulse, and SpO2. Test indication is reported in the trend table.)

•Exit

--calls up a setup table for alarms.

1)Turn rotary knob to select desired parameter field and limits, and press knob in to activate your selection.

2)The number representing the limit value turns black on a blue background, indicating that you can change it. Turn knob to change value.

3)When desired setting is displayed, press knob in to set value.

4)Press MAIN Screen key to return to MAIN screen.

--silences an active alarm tone for 1 minute ±5 seconds, and turns active blinking parameter areas into active steady parameter areas

--suspends alarms for a fixed 3-minute ±5 second period.

--starts and stops non-invasive blood pressure measurement.

--used for fast access to all parameters or NBP parameter box bottom channel screen setups, choice made from a user menu.

With an R50™ recorder connected, press the Record fixed key to start a manual, timed recording.

Note: If a recorder is not connected, pressing the Record fixed key writes 15 seconds of waveform and vital signs information to internal memory. SC 6002XL monitors can store up to five recordings, which are automatically printed as soon as the recorder is connected.

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Chapter 2: Functional Description

1 Overview

SC 6002XL monitors are configured patient monitors running on one processor, an MPC821 Power PC processor, which attends to all monitoring functions, controls all graphics functions, generates video and timing signals for the LCD screen, and interfaces with the PCMCIA. It also performs several peripheral control functions, such as NIBP control, audio volume control, and timing generation for the front end. See Figure 2-1.

					Front Panel		To
							etCO2
	Double		CUFF	Audio	Keyboard	LCD	PodCom
	Xducer
						(640 x 480)	Option
	Meas.	Safety
	ECG

	M	NIBP
	U
	X				NIBP
Resp			A
					Driver
			S					Video
		A		I						RGB
			I					DAC
		D		s
	LED Drive		C
		C		o
						LCD
				l				Network	X
SpO 2						Control
				a					F
	M							(HDLC/		Network
				t		CP		CEPT)	M
Temp	U			i					R
IBP1	X			o
				n	µController	Processor		PCMCIA
IBP2
		Front End			(68HC11)	(MPC821)		Card
					8	32		16
					SRAM	DRAM		Flash	Quad	Record
					Memory	Memory		Memory		Debug
									UART
					(512KB)	(4MB)		(2MB)		Export
							+12
					11 - 15v	POWER	+3.3V	BATTERY
							+5V	CHARGER
						CONVERSION
							+18	(Li or Pb)
							+42
							-5V			Main Board

Figure 2-1 SC6002XL Patient Monitor Block Diagram

2 Parameter Inputs

The data acquisition front end acquires and digitizes signals derived from a three-, five-, or six-electrode ECG patient lead set, a Nellcor® SpO2 transducer, an Impedance respiration measurement system, a thermistorbased Temperature transducer, and two strain-gauge IBP transducers (IBP2 = locked option). The NIBP main transducer signal is digitized together with the rest of the front end parameters. See Section 4 and Section 5 for more detailed information.

3 Main PC Board

The Main MPC821 Power PC processor not only attends to monitoring functions, but also controls all graphics functions, generates the video and timing signals for the LCD screen, interfaces with the PCMCIA, and controls the network link. In addition, it performs a host of peripheral control functions, such as NIBP control, audio volume control, and timing generation for the front end.

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3.1LCD Control

3.2Network Interface

3.3Front Panel Circuitry

3.4Pod Interface

3.5Battery Control and ON/OFF Control

A set of buffer/drivers are used to drive the 6.5” screen. In parallel, a triple video DAC generates analog RGB signals for an external monitor (typically a CRT).

The SC 6002XL monitor interfaces with the physical interface device (e.g., CPS, IDS or IHUB) automatically when connection to the device has been detected. Connections to INFINITY network services are established and maintained by software components resident on both the SC 6002XL and the physical interface device.

The front panel circuit processes the audio information, drives the fluorescent tubes on the LCD, implements a secondary alarm in case the unit resets or turns off, and routes the video and timing signals to the screen. It also routes the UART signal coming from the Pod interface to the main board Quad UART.

The Pod Interface generates an isolated voltage to power the pod and also converts the Pod Comm protocol from the pod into a UART stream that can be interpreted by the microprocessor.

The Pb-acid or Lithium battery charging and discharging cycles are controlled by a special charger circuit. The circuit initiates a charge cycle when commanded by the microcontroller. The charge cycle for a Pb-acid consists of a bulk charge period in which the battery is being supplied a constant current of ~400mA, a constant voltage period in which the battery voltage is held constant at ~14.8V and the current is allowed to diminish as the charge approaches 100%, and a float cycle in which the voltage is maintained at ~13.7V. For Lithium batteries, the charger circuit acts as a constant voltage source of 16.8V. The battery is charged from a switching supply controlled by the charger chip. The microcontroller also reads the front panel keys and the rotary knob, encodes the information coming from them, and routes it to the main processor. When the On/Stdby key is pressed, it turns the monitor on and off. In addition, the microcontroller controls the NIBP safety timer.

3.6BOOT Process, Flash The BOOT EPROM contains the boot code and must be preprogrammed Memory, and DRAM at the factory. It cannot be programmed after being installed on the Main

3.7 SRAM

board, and therefore cannot be updated in the field via a software download.

The executable software normally resides as compressed operational code in Flash memory. When the 68HC11 microprocessor senses that the on/ off switch on the front panel has been pressed, it turns on (or turns off) the 3.3V and 5V supplies. As the 3.3V supply turns on, it wakes up the MPC821 main processor, which begins execution from the BOOT PROM. During boot initialization, the main processor attempts to read the Memory Card to detect legal software. If a legal software memory card is present, the software is loaded from the card. Otherwise, the main processor loads software from the Flash to the main processor DRAM, from which it completes initialization and enters operational mode. DRAM contains expanded operational code, and data space variables and stacks.

The 512K x 8 SRAM is battery backed up and is used for error logs, trends, recordings and other non-volatile memory uses.

3.8 68HC11		The 68HC11 Microcontroller, with 2K of EEPROM and 256 bytes of RAM,
	Microcontroller	is powered as long as there is a main supply plugged into the system or
		when the user presses the ON/OFF button. The code is stored in its
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	internal flash memory, but can be downloaded from the MPC821. The
	microcontroller performs the following functions:
On/Off control	When the ON/OFF pushbutton (either local or remote is pressed), the
	microcontroller activates the 3.3V and 5V supplies, which wakes up the
	MPC821 through a power-on reset. In addition, the microcontroller has
	control over a flyback supply, which comes on any time the unit is plugged
	into AC power (in order to charge the battery) or is turned on.
	The microcontroller also reads the front panel keys and the rotary knob,
	encodes the information coming from them, and routes it to the main
	processor.
NBP Valve modulation	When directed by the main processor, the microcontroller supplies
	modulation signals for the two NBP manifold valves.
NBP Safety Timer	When the pump or the valve V2 are turned on, the microcontroller initiates
	a 128 sec. timer (90 sec. or 60 sec. for neonates) which, if exceeded,
	produces an NBP fault and results in cut off of main 12V power to the NBP
	manifold.
Battery Charger	The microcontroller initiates a battery charge when needed, and stops the
	charging process when the battery reaches full capacity. It can recognize
	whether a Pb or Lithium battery is connnected into the sytem, and directs
	the battery controller chip to charge to different levels depending on the
	battery type. See Section 3.5. The microcontroller also acquires the battery
	voltage and current for monitoring purposes.
Recorder Power	The microcontroller controls the power applied to a stand-alone R50
	Recorder.
Main Audio Generator	The microcontroller generates the fundamental audio frequency of the
	unit’s tone generator, as directed by the main microprocessor.

4 Front End

4.1NIBP Control

4.2Safety

All physiological signals (except etCO2) are digitized through a high speed multiplexing system and a common 16 bit ADC. The data is then transferred through the isolation barrier to an HDLC port in the main processor, where it is digitally filtered and processed.

The NIBP main transducer signal is digitized together with the rest of the front end parameters. However, the redundant (overpressure) transducer is processed separately on the grounded end of the board, and the pump on/off signal and valve enable signals are generated off of the MPC 821 microprocessor. The PWM signals for the valve flow control and the redundant safety timer are implemented in a separate microcontroller (MC68HC11).

•Patient isolation withstands 5kV during defib.

•Leakage currents are limited to safe values normally and during single fault conditions.

•Patient is protected against electrosurgical burns at the electrodes.

•Defibrillation protection does not drain excessive current away from the patient.

•Specially shielded connectors and cables are used to provide excellent immunity up to 1000MHz and can not be touched by the patient even when disconnected.

•Single cable from MultiMed Pod to main SC6002XL unit reduces clutter between bed and monitor.

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		NBP	Pressure		Low-Pass	NBP
		Hose	Transducer		Filter	Amp
						Power Monitor	4
			Linearizer		Amp	Temp	2
						Temp Ref.	2
							6
		RF Filter				ECG	4
		Lead Off	Pre-	Bandpass
						Amp
		Neutral	Amp		Filter
		SW				Pace	2
						Amp
			Modulator		Current		M	16 Bit
					Sources
							U	A / D
							X	Converter
Temp	MultiMed				Bandpass	Resp	2
			Demodulator
ECG	Defib				Filter	Amp
Resp	Protection							Control	Asic
SpO 2	ESU	Modulator	LED Drive						Data Control
						Cal Resistor		Power
						Red
		Differential	Ambient						HDLC
			Light		Demodulator				(to MPC821)
		I/V
		Converter	Rejection			I/R

Figure 2-2 Front End

5Physiological Parameter Data Acquisition

Transducers gather physiological data at the patient and feed them into the small MultiMed Pod at the bed. The MultiMed Pod in turn is connected via a 3-meter cable to the front end in the main unit where analog ECG, Respiration, Temperature, and SpO2 signals are converted to digital form and sent through isolators for processing.

5.1 ECG/Resp	The MultiMed Pod located close to the patient accepts a set of 3, 5 or 6
	shielded ECG electrode leads, an SpO2 (Nellcor) cable adapter, and a
	temperature sensor. The ECG section contains RF filters, and overvoltage
	clamps that include 1k series resistors to limit shunting of defibrillator
	current. The SpO2 and temperature sections also contain RF filters.
	Impedance respiration is sensed through the ECG electodes. Void-free
	potting and internal shielding enable compact containment of high voltage
	defibrillator and electrosurgery pulses. The small interconnecting cable to
	the main assembly is captive at the MultiMed POD but plugs into the
	MultiMed front end via a specially shielded connector.
	The front end accepts physiological signals from the MultiMed POD
	connector and feeds temperature, respiration, and ECG signals via RF
	filters, configuration multiplexers, and pre-amplifiers to a high-speed
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multiplexer driving a 16-bit analog-to-digital (A/D) converter. The data stream is sent to the Main Processor board via an opto-isolator. Control commands from the Processor are sent out to the front end on a similar isolating link. Isolated DC power is also provided.

The ECG signals are conductively coupled to the isolated circuits via current-limiting series resistors, whereas the SpO2 signals are optically isolated at the transducer. Temperature signals are doubly insulated at the patient by disposable boots on the sensors. AC (40kHz) excitation currents for respiration monotoring are dc-isolated by high-voltage ceramic capacitors.

The A/D samples the following parameters:

Table 2-1 Parameter Sampling Table

	Parameter	# of Channels
	ECG	4
	Pace	2
	SpO2 Red	1
	SpO2 IR	1
	NBP	1
	Resp	1
	Temp	2

	The hardware pace detector monitors the ECG signal in two of the four
	channels (those not connected to the chest leads). All other signals are
	decimated and filtered using digital signal processing in the MPC821. High
	oversampling rate is required to minimize the requirements (and size) of
	the analog anti alias filters. Superior rejection to ESU and other types of
	interference is achieved with this type of design.
5.1.1 ECG	• Bandwidth is set flexibly by software filters.
	• Reconfigurable neutral selector can drive any electrode.
	• Lead-on detection functions with even poor electrodes.

• Calibration voltages can be superimposed on patient wave-forms or onto flat baselines.

See Figure 2-3. Composite electrocardiographic (ECG) signals generated by the heart and by a pacemaker are filtered to reduce RF interference from impedance respiration and electrosurgery and then injected with dc lead-off detection currents. Over-voltage clamps protect the semiconductors from the surges passing the sparkgaps in the MultiMed Pod and also reduce the dc current applied to the patient due to a component fault.

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RA	LA
aVR	aVL
	aVF
	LL

Figure 2-3 Lead-Forming Network

5.1.2	Lead Selection	A lead-forming network following the RF filter generates the necessary
		reference points for electrocardiographic measurements. Both normal
		leads (I, II, III, V1 and V2) and augmented leads (aVL, avR, and avF) can be
		obtained. See Figure 2-3.
		Four differential channels generate the main axes I, II, V1 and V2. The
		remaining leads are derived mathematically as indicated in the vector
		diagram of Figure 2-3.
5.1.3	Lead-Off Detection	Lead-off detection is accomplished by introducing a very small current into
		each patient electrode, which would drive the corresponding input high if
		it were disconnected. A set of five comparators detects a lead-off
		condition.

5.1.4Low-Pass Filtering and Common Mode Enhancement

The ECG preamplifier has a flat frequency response of 0.5 - 40Hz, with a software notch filter at 50/60 Hz. A 180° combined signal drives the neutral electrode to increase the CMMR.

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5.2 Respiration

Impedance respiration is monitored by injecting a 40 kHz square wave of current into the RA electrode. The resulting 40 kHz voltage drop between the RA + LL electrodes is proportional to the impedance. Especially balanced true current sources do not load the ECG electrodes or distort the ECG morphology. The returning 40 kHz differential voltage is amplified, synchronously demodulated, and low-pass filtered. An AC-coupled stage with an “autobloc” DC restorer feeds the input to the A/D converter with a nominal output of 60 mV per Ohm.

5.3 SpO2

5.3.1 SpO2 Front End

Figure 2-4

SpO2 Functional Block Diagram

The pulse oximeter circuit uses a Nellcor® sensor to detect the oxygen saturation level in arterial blood flow. Determination of the concentration of oxygen in the blood is based upon the principle that the absorption of red (R) light depends on the degree of oxygenation of the blood, whereas the absorption of infrared (IR) radiation is relatively independent of oxygenation and causes only constant attenuation. See Figure 2-4. In the SpO2 sensor, R and IR light emitting diodes (LEDs) are alternately pulsed ON at a 25% duty cycle. The light is transmitted through a well-perfused part of the body, such as a fingertip or an ear lobe. The intensity of light (including ambient) transmitted through or scattered by the blood is converted to a current by a photodiode in the sensor. The current that appears when both LEDs are OFF depends mainly on the ambient light, which is later subtracted to leave only the R or IR signal levels. The large dynamic range of the light intensities requires constant automatic monitoring and adjustment.

The intensities of the R and IR sources are independently controlled by two digital-to-analog converters (DACs) attenuating the 2.5 V reference. These levels or zero are sequentially selected by a multiplexer, and converted to a driving current which is further guided or inverted by an output multiplexer to the LEDs in the sensor.

The primary purpose of the SpO2 front end is to convert the sensor’s analog signal into individual digitized signals for the red and infrared analog signals for processing by the microprocessor. See Figure 2-5 on page 16. Circuitry in the front end first eliminates the non-pulsatile component in the input signal, then demultiplexes the resulting pulsatile signal to separate the R and IR signal components, and finally converts the demultiplexed R and IR analog signals into serial digital data streams.

A sequence of light pulses, driven from the chopped current source in the sensor LEDs, are passed through a finger or an earlobe to a photodiode. The sensor LEDs are connected in an anti-parallel fashion on one pair of wires.

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5.3.2Input Stage

5.3.3Brightness Control

5.3.4Ambient Light Rejection Amplifier

Figure 2-5

Sensor LED Timing Diagram

A timing generator controls the sensor LEDs and signal multiplexing/ demultiplexing (see Figure 2-5) by means of three control signals:

•IRONL (infrared LED)

•AMBONL (LEDS not lit)

•REDONL (red LED)

A preamplifier converts the photocurrent to an equivalent voltage, and applies it to a 20 Hz high-pass filter that removes the non-pulsatile component. The output of the preamplifier is fed to a saturation detector.

If the output of the preamplifier is in saturation, the gate array provides a signal to the digital-to-analog converters (DACs), which controls the drive current to increase or decrease the brightness of the LEDs.

Controlling LED brightness extends the system dynamic range. For a very transparent subject it may not be possible to reduce the gain to prevent saturation. In that event, the brightness must be reduced. An additional purpose is to equalize the received amplitude of each wavelength. If both LEDs are turned ON to maximum brightness, and the software finds an extraordinary difference between the two, the microprocessor tends to reduce that difference by equalizing the R or IR brightness signals.

The ambient rejection amplifier is a synchronous detector. The signal appied to its inverting input is a composite of R, IR, and ambient signals. The non-inverting input is the same signal gated by the timing generator. This synchronously multiplexes the IR, ambient, and R analog signals.

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5.4Invasive Blood Pressure

5.5Non-Invasive Blood Pressure

5.5.1 NBP Subsystem

	+2.6V
	-2.6V
Figure 2-6	IBP Functional Block Diagram

The IBP circuit has been designed to be used with a strain gauge pressure transducer. See Figure 2-6. The analog portion of the IBP circuit provides excitation voltages for resistance bridge transducers. These voltages are derived from a reference which is also used to derive the A/D converter reference voltage. At the circuit input, a resistor divider network provides for transducer unplugged detection. R-C filtering and protection diodes limit the effects produced during electrosurgery, defibrillation, and other such procedures. A selector multiplexer allows for the insertion of calibration signals into the amplifier stage. The multiplexor feeds the pressure signal to a buffer amplifier, which in turn feeds the AD converter analog input. This allows the monitor to measure pressure signals in a range greater than ±700 mmHg with a resolution of approximately

.02mmHg/LSB.

When no pressure transducer is plugged into the monitor, the resistor divider network puts a negative signal into the instrumentation amplifier, which propagates through the system to indicate the unplugged condition.

Refer to Figure 2-7 on page 18.

The NBP subsystem consists of the following components:

•pump

•two modulating valves

•strain-gauge pressure transducer

•overpressure sensor

•pneumatic manifold

In addition, an electronic data acquisition and control system measures and digitizes the pressure pulses as the cuff inflates and deflates. Pump and valve control circuitry engage these elements as needed in the measurement cycle. Several interlock systems and expiration timers ensure the safety of the equipment in case of single point failures.

The SC6002XL NBP circuit uses a cuff and the oscillometric method to determine blood pressure without using a microphone. A strain-gauge pressure transducer is DC-coupled to a 16-bit A/D converter, so that cuff pressure is measured with adequate resolution to detect blood pressure pulses. This eliminates the need for a separate ac-coupled measurement channel, with its associated distortion and long transient recovery.

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A/D

Figure 2-7 NBP Functional Block Diagram

5.5.2

NBP System Description

The combination of high-resolution A/D conversion and digital filtering,

together with wide-range linear deflation control allows the circuit to

measure blood pressure very rapidly and accurately, and to recover quickly

from motion artifacts. The non-invasive pressure system is composed of

the following components:

• pneumatic assembly

• electronic circuitry, mounted on the Main CPU Board

Pneumatic Assembly

The pneumatic assembly contains a pump, two modulating valves (V1 and

V2), two air filters (intake and manifold), and a manifold assembly which

interconnects these components. The pump provides the pressurized air

to inflate the blood pressure cuff. V1 and V2 control the air flow during the

deflation phase of a blood pressure measurement. V1 is a normally-closed

exhaust valve with a relatively small orifice (relative to V2). V2 is a normally-

open exhaust valve with a relatively large orifice. The pump speed can be

controlled to permit accurate inflation pressures for special applications.

The filters prevent potential contamination of pneumatic components by

debris coming from the cuff or hose.

Electronic Circuitry

The electronic circuitry, mounted on the Main CPU Board, contains the

electrical drivers for the pump, the valves, and its power supplies. In

addition, the readback from the pressure transducer is processed through

the floating section ADC. The software data acquisition and algorithm

processing is performed in the MPC821 main processor.

5.5.3

Operation

The measurement sequence consists of an inflation phase, in which the air

pump inflates the cuff, which has been wrapped around the patient’s limb

(typically the upper arm or thigh) to a predetermined pressure. At this

point, the blood circulation to the limb is occluded. The monitor then

linearly deflates the cuff at a software-controlled rate during which time

the blood pressure parameters are determined by digital filtering and

analysis of waveform data obtained from the pressure transducer during

the deflation cycle.

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		Inflation Phase	When a blood pressure measurement is initiated (via software or front
			panel fixed key), V2 closes, the pump turns ON, and the pressure
			transducers monitor the ensuing pressure rise. When the pressure has
			reached the target inflation pressure, the pump turns OFF and a dynamic
			braking circuit rapidly brings the pump to a halt. The target inflation
			pressure adapts to the patient’s systolic pressure, just occluding the blood
			flow. The software monitors the slope of the pressure curve during
			inflation to estimate the cuff volume, a factor used in the deflation
			sequence.
		Deflation Phase	After the pump stops, there is a short delay to allow thermal transients to
			settle. Either V1 or V2 is modulated to control the deflation rate. The choice
			of V1 or V2 and the initial pulse width is made based on the estimated cuff
			volume determined during the inflation cycle. The chosen valve is
			modulated at a 20 Hz rate, and the pulse width (open time) is continuously
			adjusted to provide a linear deflation rate. If initial deflation was started with
			V1, the software may determine that it needs to switch to V2 to maintain
			proper deflation. In either case, V2 opens fully (de-energizes) when the
			measurement cycle is ended to allow for rapid and complete deflation.
5.5.4		NBP Hardware	Pump control circuitry provides the following three functions:
			• limits the current to the pump when it starts, to prevent power supply
			overload
			• dynamically brakes the pump when the pump is shut off
			• provides a closed-loop speed control for special low-flow operations
		Speed Control	Pump speed is controlled by measuring the back-EMF generated by the
			motor winding, which is directly proportional to the speed. However, to
			obtain a measurement of the back-EMF, the drop caused by copper losses
			must be added to the voltage appearing on the motor winding. The speed
			control effectively drives the pump at constant full speed.
		Current Limit	Dedicated circuitry limits the current to the pump. When the current on the
			pump is approx. 363 mA, the current loop takes over and limits its value.
			The microprocessor and an N-channel FET turn the pump ON.
5.5.5		Valve Control	A relatively high pulse voltage is used to drive V1 and V2 to get quick
			response and extend the pulse-width flow control range.
5.5.6		Power Supplies	Separate control logic supplies voltage (+12V) to the pump and V2 to
			provide them with redundant turn-off capability. Without +12V the pump
			cannot run, and V2 can neither close nor remain closed. Power supplies
			necessary for operation of the NBP circuitry are derived as follows:
		+5V and -5V Supply	The +5V and -5V for the NBP analog circuitry are derived from the floating
			section.
		+12V Supply	The +12V drives the NBP pump and both modulating valves. The 6002XL
			flyback supply produces the +12V. This circuit produces several voltages
			needed for monitor operation. The main flyback regulation loop is closed
			around the +12V output, therefore making it the best regulated of the
			multiple voltages generated.
			In operation, a resistor network samples the +12V output and feeds it into
			the controller chip error amplifier, which compares it to an internal
			reference. The duty cycle of the switching transistor is adjusted to null this
			reference. A separate current feedback loop is used to stabilize the circuit
			and provide current limiting protection.
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	+36V Regulator	A +36V supply used to accelerate the energizing of the valve coils is
		derived from the 42V raw supply generated by the flyback supply.
5.5.7	Power Supply Monitor	The power supply monitor circuit provides reset logic to the
		microprocessor, and the redundant power switch circuit, both at power-up
		and in the event of a power failure or voltage drop. The heart of the monitor
		is a power supervisor chip. At power-up, the control line is held low for a
		period of about 200 ms, after which the voltage rises to the +5V level. After
		start-up, any dip in the +5V that causes the output to go to less than
		+4.75V causes the same sequence. A resistor network is used to monitor
		the +12V supply. When the voltage on the reference signal falls below
		+1.25V, a reset sequence similar to the one described above ensues. The
		+5V and -5V are monitored via the floating section ADC.
5.5.8	Safety Timer	The safety timer becomes active only after starting the pump at least one
		time. Once the pump has been activated, the timer circuit operates
		regardless of whether the pump has been turned off. Starting of the pump
		is sensed by voltage developed across the pump sense resistor. If as a result
		of some failure, hardware or software, the pump continues to run longer
		than the timer expiration period, a microcontroller output rises and opens a
		redundant switch, which causes the pump to turn off and V2 to open.

The safety timer period is derived from the microcontroller clock. Note that, for redundancy purposes, the safety timer is implemented not in the MPC821 but in the 68HC11 microcontroller.

Among other signals multiplexed into the floating section data stream are power supply monitor voltages. Measuring these voltages gives an indication of the integrity of the power supplies and the A/D converter voltage reference.

5.5.9 Pressure Channels	Pressure fluctuations in the cuff change the balance of the pressure
	measurement bridge, resulting in a differential voltage which is fed into an
	amplifier. The gain of the amplifier is determined by the setting of a
	calibration potentiometer. This potentiometer is initially adjusted in the
	factory, and from then on the calibration should be checked every year.

The overpressure hardware is fed by a single power source. This increases safety of the system, since a failure of the reference voltages does not impact operation of the overpressure channel. An overpressure test is performed at each power-up cycle to ensure that the overpressure circuitry is working. Any error detected in the overpressure comparator circuit is fed to the redundant power switch circuitry described above. The software overpressure detection is completely independent of the overpressure circuitry.

Figure 2-8Temperature Functional Block Diagram

5.6 Temperature Circuit

Temperature measurements are made using a thermistor probe that is electrically equivalent to YSI 400 series probes. See Figure 2-8.

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