GE MAC 5500 User manual

MAC® 5500

Resting ECG Analysis System

Service Manual

2020299-020 Revision A

NOTE: The information in this manual only applies to MAC 5500 resting ECG analysis systems with product

code SCD. It does not apply to earlier software versions. Due to continuing product innovation, specifications in this manual are subject to change without notice.

MUSECASE®, MAC, MARS

, and 12SL are trademarks owned by GE Medical Systems Information

Technologies, a General Electric Company going to market as GE Healthcare. All other marks are not owned by GE and are instead owned by their respective owners.

T-2 MAC 5500 resting ECG analysis system Revision A

2020299-020 25 July 2005

Contents

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Manual Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

Manual Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

Warnings, Cautions, and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Responsibility of the Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6

Equipment Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

Service Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9

Equipment Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9

Serial Number Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10

Label Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10

2 Equipment Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

Back View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Connector Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Overview / Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7

Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10

+3V-C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10

+3V-M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10

+3V-EMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10

+5V-M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10

+5V-EMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10

+18V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

+1.8V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

Revision A MAC 5000 resting ECG analysis system i

2020299-020

+12V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

REF2V5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

VAna+, VAna- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

Super I/O and FPGA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

CPU ATMEL AT91RM9200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12

CPU (Stooges) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-13

RTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-13

CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-13

External Bus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-13

Boot Loader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14

FPGA Internal Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-15

Board ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-16

XBus Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-16

Video Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-16

Interrupt Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-22

System Interrupt Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-23

Acquisition Module Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-23

Thermal Printhead Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-24

Serial EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-25

BBus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-25

PWM Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-25

Beep Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-26

PC Card Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-26

SDRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-26

NAND Flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-26

Secure Digital Card Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-27

Serial EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-27

Daughter Board Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-27

VGA LCD/CRT Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-27

LCD Panel EMI Reduction Components . . . . . . . . . . . . . . . . . . . . . . . . . . .2-28

CRT Video DAC / Sync / Buffers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-28

Acquisition Module Transceiver / Power Switch . . . . . . . . . . . . . . . . . . . . . . . . .2-28

Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-28

Acquisition Power Regulator / Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-29

COMM Port Power Switch / Current Limiter / KISS Power . . . . . . . . . . . . . . . . .2-29

Thermal Printhead Power / Pixel Test Hardware . . . . . . . . . . . . . . . . . . . . . . . . .2-30

Super I/O Peripheral Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-30

RS-232 Serial Ports (One Dual Mode RS-232 / IrDA) . . . . . . . . . . . . . . . . .2-30

Clock/Calendar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-30

PS2 Keyboard Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-31

The Three Stooges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-31

Startup Self Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-31

BBus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-32

Shemp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-32

Larry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-32

Moe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-34

ii MAC 5500 resting ECG analysis system Revision A

2020299-020

3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Preparation for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

Trolley Height Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

Installing the MAC 5500 resting ECG analysis system . . . . . . . . . . . . . . . . . . . . .3-6

Installing the Optional External Modem Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8

Magnetic Card Reader Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10

Bar Code Reader Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12

Type-S Trolley Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-14

MAC 5500 ST Requirements and Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Compatible Blood Pressure Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-15

Compatible GE Medical Systems Information Technologies Treadmills . . . . . . .3-16

Analog Treadmills . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-16

Bicycle Ergometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-17

4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Recommended Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3

Required Tools and Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3

Inspection and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4

Exterior Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4

Interior Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4

Thermal Printhead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

Battery and Patient Cable Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

Patient Cable Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

Disassembly Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Preliminary Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

Trolley Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7

Type-S Trolley Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8

Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-9

Top Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10

Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10

Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-11

Display/Keyboard Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-12

Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-12

Display/Keyboard Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-13

Revision A MAC 5500 resting ECG analysis system iii

2020299-020

Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-13

Main CPU Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-14

Removal of CPU Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-14

Reassembly of CPU Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-14

Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16

Service Only Setups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-18

Restore System Setups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-18

Restore Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-19

Disable Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-19

Printhead Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-20

Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-20

Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-20

COMM Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-21

Writer Roller/Carriage Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-22

Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-22

Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-22

Trolley Casters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-23

Domestic Electrical Safety Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25

AC Line Voltage Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-25

Leakage Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-26

Leakage Test Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-27

Ground Continuity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-29

5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Assembly Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3

Assembly Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3

General Fault Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Power-up Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

Power-up Flow Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5

Poor Quality ECGs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6

Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7

Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8

Loading the System Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8

Substitute Master Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8

System Diagnostics Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9

Display Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9

Pixel Verification Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9

Grey Scale Test Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9

Speaker Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-10

Keyboard Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-10

Writer Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-11

Battery Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-13

iv MAC 5500 resting ECG analysis system Revision A

2020299-020

Battery Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-13

Battery Discharge Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-13

Battery Charge Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-14

Print Charge/Discharge Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-14

Communication Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-14

COM Port Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-14

External Modem Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-15

Internal Modem Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-15

Ethernet Module Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-15

Acquisition Module Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-15

Analog I/O Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-15

Analog Output Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-15

Analog Input Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-16

DCOut Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-16

ECGOut/QRSTrigger Loopback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-16

Floppy Drive Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-16

Internal Memory Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-17

SD Card Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-17

Equipment Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18

ECG Data Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-18

Missing ACI-TIPI Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-18

No BP from External Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-18

Treadmill/Ergometer Does Not Move . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-18

System Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19

Frequently Asked Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-20

Save Setups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-20

Storing ECGs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-20

Format an SD Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-20

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-20

Battery Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-21

System Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-21

Location Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-21

Patient Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-21

Passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-22

Clinical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-22

Report Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-22

Hi-Res and Phi-Res . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-22

Editing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-22

Entering Patient Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-23

Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-23

Losing Fields When Transmitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-23

Input and Output Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24

A Pins (J1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-24

COM1 (COM3/4) Pins (J3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-24

Revision A MAC 5500 resting ECG analysis system v

2020299-020

COM2 Pins (J5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-25

Analog Pins (J6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-25

EXT. VID. Pins (J7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-26

CPU PCB Input/Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-27

Battery Pack/Monitor, J2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-27

LCD Backlight, J4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-27

Keyboard, J8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-27

LCD, J10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-28

Power Supply/Motor, J11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-29

Thermal Printer, J12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-30

Floppy Disk Drive, J13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-31

Acquisition Module, J14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-32

6 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Ordering Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3

Field Replaceable Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Appendix A – Abbreviations . . . . . . . . . . . . . . . . . . . . . . .A-1

Standard Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Appendix B – Technical Specifications . . . . . . . . . . . . . .B-1

Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-3

Computerized Electrocardiograph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-3

Writer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-4

Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-4

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-4

Vectorcardiography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-4

Hi-Res and PHi-Res Signal-Averaged Electrocardiography . . . . . . . . . . . . . . . . .B-5

Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-5

Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-5

Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-7

Appendix C – Electromagnetic Compatibility . . . . . . . . .C-1

Electromagnetic Compatibility (EMC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

Guidance and Manufacturer's Declaration - Electromagnetic Emissions . . . . . . .C-3

Guidance and Manufacturer's Declaration - Electromagnetic Immunity . . . . . . . .C-4

Recommended Separation Distances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6

Compliant Cables and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-7

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Index-1

vi MAC 5500 resting ECG analysis system Revision A

2020299-020

1 Introduction

Revision A MAC 5500 resting ECG analysis system 1-1

2020299-020

For your notes

1-2 MAC 5500 resting ECG analysis system Revision A

2020299-020

Manual Information

Revision History

Each page of the document has the document part number and revision letter at the bottom of the page. The revision letter identifies the document’s update level. The revision history of this document is summarized in the table below.

Revision Date Comment

Manual Purpose

This manual supplies technical information for service representative and technical personnel so they can maintain the equipment to the assembly level. Use it as a guide for maintenance and electrical repairs considered field repairable. Where necessary the manual identifies additional sources of relevant information and or technical assistance.

Introduction: Manual Information

Table 1. Revision History, PN 2020299-020

A 25 July 2005 Initial release of this document.

Intended Audience

See the operator’s manual for the instructions necessary to operate the equipment safely in accordance with its function and intended use.

This manual is intended for the person who uses, maintains, or troubleshoots this equipment.

Revision A MAC 5500 resting ECG analysis system 1-3

2020299-020

Introduction: Warnings, Cautions, and Notes

Warnings, Cautions, and Notes

The terms danger, warning, and caution are used throughout this manual to point out hazards and to designate a degree or level or seriousness. Familiarize yourself with their definitions and significance.

Hazard is defined as a source of potential injury to a person.

Term Definition

DANGER Indicates an imminent hazard which, if not avoided, will result in death or

serious injury.

WARNING Indicates a potential hazard or unsafe practice which, if not avoided, could

result in death or serious injury.

CAUTION Indicates a potential hazard or unsafe practice which, if not avoided, could

result in minor personal injury or product/property damage.

NOTE Provides application tips or other useful information to assure that you get

the most from your equipment.

1-4 MAC 5500 resting ECG analysis system Revision A

2020299-020

Safety Messages

Introduction: Safety Messages

Additional safety messages may be found throughout this manual that provide appropriate safe operation information.

DANGER

Do not use in the presence of flammable anesthetics.

WARNINGS

This is Class 1 equipment. The mains plug must be connected to an appropriate power supply.

Operate the unit from its battery if the integrity of the protective earth conductor is in doubt.

CAUTIONS

This equipment contains no serviceable parts. Refer servicing to qualified service personnel.

U.S. Federal law restricts this device to the sale by or on the order of a physician.

Responsibility of the Manufacturer

GE Medical Systems Information Technologies is responsible for the effects of safety, reliability, and performance only if:

 Assembly operations, extensions, readjustments, modifications,

or repairs are carried out by persons authorized by us.

 The electrical installation of the relevant room complies with the

requirements of the appropriate regulations.

 The equipment is used in accordance with the instructions for

use.

Revision A MAC 5500 resting ECG analysis system 1-5

2020299-020

General

Introduction: Safety Messages

The intended use of this device is to record ECG signals from surface ECG electrodes. This device can analyze, record, and store electrocardiographic information from adult and pediatric populations. This data can then be computer analyzed with various algorithms such as interpretive ECG and signal averaging for presentation to the user.

This device is intended for use under the direct supervision of a licensed health care practitioner.

Failure on the part of the responsible individual, hospital, or institution using this equipment to implement a satisfactory maintenance schedule may cause undue equipment failure and possible health hazards.

To ensure patient safety, use only parts and accessories manufactured or recommended by GE Medical Systems Information Technologies.

Contact GE Medical Systems Information Technologies for information before connecting any devices to this equipment that are not recommended in this manual.

If the installation of this equipment, in the USA, will use 240 V rather than 120 V, the source must be a center-tapped, 240 V, single-phase circuit.

Parts and accessories used must meet the requirements of the applicable IEC 60601 series safety standards, and/or the system configuration must meet the requirements of the IEC 60601-1-1 medical electrical systems standard.

The use of ACCESSORY equipment not complying with the equivalent safety requirements of this equipment may lead to a reduced level of safety of the resulting system. Consideration relating to the choice shall include:

 use of the accessory in the PATIENT VICINITY; and

 evidence that the safety certification of the ACCESSORY has

been performed in accordance to the appropriate IEC 60601-1 and/or IEC 60601-1-1 harmonized national standard.

1-6 MAC 5500 resting ECG analysis system Revision A

2020299-020

Equipment Symbols

The following symbols appear on the equipment.

Type B equipment.

Type BF equipment, external defibrillator protected.

Alternating current. When illuminated, the green LED next to this symbol indicates AC power is connected.

Equipotential.

Introduction: Equipment Symbols

Charge the battery. The flashing amber LED next to this symbol indicates you must connect the system to AC power to re-charge the battery.

DO NOT throw the battery into the garbage.

Recycle the battery.

Consult accompanying documents.

Classified with respect to electric shock, fire, mechanical, and other specified hazards only in accordance with UL 2601-1, CAN/CSA C22.2 No. 601-1, CAN/CSA C22.2 601-2-25, EN

60601-2-25, EN 60601-1-1.

Revision A MAC 5500 resting ECG analysis system 1-7

2020299-020

Introduction: Equipment Symbols

In Europe, this symbol means dangerous or high voltage. In the United States, this symbol represents the caution notice below:

CAUTION

To reduce the risk of electric shock, do NOT remove cover (or back). Refer servicing to qualified personnel.

This symbol indicates that the waste of electrical and electronic equipment must not be disposed as unsorted municipal waste and must be collected separately. Please

contact an authorized representative of the manufacturer for information concerning

the decommissioning of your equipment.

The number found under this symbol is the date of manufacture in the YYYY-MM format.

1A, 2A, 3A, 4A, 5A, 6A, 7A, 8A, 9A, 10A, 11A, 81A

1-8 MAC 5500 resting ECG analysis system Revision A

2020299-020

Service Information

Service Requirements

Refer equipment servicing to GE Medical Systems Information Technologies authorized service personnel only. Any unauthorized

attempt to repair equipment under warranty voids that warranty.

It is the user’s responsibility to report the need for service to GE or to one of their authorized agents.

Equipment Identification

The serial number label is located inside the device where shown below.

Introduction: Service Information

12A

Every GE Medical Systems Information Technologies device has a unique serial number for identification. The serial number is formatted as shown in

NOTE

The examples shown are representative only. Your product label may differ.

Revision A MAC 5500 resting ECG analysis system 1-9

“Serial Number Format” on page 1-10.

2020299-020

Serial Number Format

Introduction: Service Information

### ## ## #### # #

ABCDEF

Table 2. Serial Number Format

Product code

B Year manufactured (00-99)

00 = 2000 01 = 2001 02 = 2002

(and so on) C Fiscal week manufactured D Production sequence number E Manufacturing site F Miscellaneous characteristic

Label Format

1. This manual applies to MAC 5500 with product code

SCD.

C D

Table 3. Equipment Identification Label

A Date of manufacture in YYYY-MM format B Part number of product C Product code description D Serial number (described above) E Manufacturing site

1-10 MAC 5500 resting ECG analysis system Revision A

2020299-020

2 Equipment Overview

Revision A MAC 5500 resting ECG analysis system 2-1

2020299-020

For your notes

2-2 MAC 5500 resting ECG analysis system Revision A

2020299-020

Equipment Overview: General Description

General Description

The MAC 5500 resting ECG analysis system is a 15 lead, 12 channel system with a 10.4 inch (264 mm) diagonal display, active patient cable, battery operation, and late potential electrocardiography. There are also options for communication capabilities.

Front View

B C D

115B

Name Description

A display screen View the waveform and text data. B modem port Connect the telephone cable here. C LAN port Connect to the LAN here.

 The green LED right of this port indicates that power

is supplied to the communication card from the Ethernet link.

 The amber LED left of this port flashes to indicate

network traffic.

D keyboard Press the keyboard keys to control the system or to enter

data.

Revision A MAC 5500 resting ECG analysis system 2-3

2020299-020

Back View

Equipment Overview: General Description

D E

A B C

Name Description

A back panel connectors Connect peripheral devices here. B secure data card slot Insert secure data card for external storage here.

C green AC power light Indicates the system is connected to AC power.

117A

D amber battery light Indicates the battery is recharging. E internal access button Press to open the system to change paper or the

battery.

2-4 MAC 5500 resting ECG analysis system Revision A

2020299-020

Equipment Overview: Connector Identification

Connector Identification

ABC D E F G H I

WARNING

LEAKAGE CURRENT – Keep leakage current within acceptable limits when connecting auxiliary equipment to this device.

Total system leakage current must not exceed 100 microamperes.

Table 4. Back Panel Connectors

Item Name Description

A A Connect an optional card reader or optional bar code reader B 1 Connect a GE KISS pump. (If system has the stress option,

connect a T2000 or external blood pressure device cable to this port.)

C 2 Connect a local transmission cable, serial line, modem, or client

bridge (wireless option).

D ANA/TTL Connect a device requiring analog data or TTL trigger

(ultrasound, stress echo, ergometer, analog treadmill, blood

pressure units, etc.). E EXT.VID. Connect an external video display. F IR Point at a MAC 5000, MAC 5500 or MUSE system’s IR

transceiver to transmit or receive ECG data. G card slot Insert the system card into this slot to archive or restore data

from external media or to update software. H ground lug Connect non-grounded peripheral devices to ensure

equipotential.

I main AC power Insert the main AC power cable.

Revision A MAC 5500 resting ECG analysis system 2-5

2020299-020

Equipment Overview: Detailed Description

Detailed Description

Block Diagram

79A

2-6 MAC 5500 resting ECG analysis system Revision A

2020299-020

Equipment Overview: Theory of Operation

Theory of Operation

Overview / Block Diagram

The MAC 5500 CPU board contains all of the circuitry for the MAC 5500 resting ECG analysis system except for the line power supply, acquisition module, keyboard and display. Although the MAC 5500 runs software derived from products based on the Max-1 architecture (running on the C-Exec operating system), it has almost nothing in common with that hardware family.

In a nutshell, the board contains the following:

 64 MB SDRAM (holds both code and data)  32 MB SDRAM acts as video frame memory  32 MB NAND Flash (holds FPGA configuration and system code)  32 MB NAND Flash for ECG Record storage  128 KB Boot Data Flash (holds primary boot image)  CRT video DACs  External 12 Volt Power Switch  Acquisition Module Transceiver / Power Switch  Printhead Power Switches and Pixel Test Circuit  Daughter Board Interface which support serial ports, USB and

 Switch Mode Power Supplies

 3.3 Volt for Logic, LCD  5 Volt for Logic, Printer,  12 Volt for LCD backlight, External Com Port Power  Battery Charger  -12 Charge Pump for Analog Circuits

 Linear Power Supplies

 1.8 Volt (AT91RM9200 Core and FPGA Core)

 2.5 Volt Reference

 3.3 Volt for System Supervisor (Moe Stooge)

 12 Volt for Analog Circuits

 Crystals / Clocks

 24 MHz Oscillator for FPGA

 32.768 Khz Real Time Clock for Super IO chip.

 32.768 Khz (AT91RM9200)

 18.432 Mhz (AT91RM9200)

 4 Mhz (3 devices, 1 for each Stooge)

card.

Revision A MAC 5500 resting ECG analysis system 2-7

2020299-020

Equipment Overview: Theory of Operation

 Atmel AT91RM9200 CPU Containing:

 Incorporates the ARM920T ARM® Thumb Processor

- 200 MIPS at 180 MHz, Memory Management Unit

- 16-KByte Data Cache, 16-KByte Instruction Cache, Write

Buffer

- In-circuit Emulator including Debug Communication Channel

- Mid-level Implementation Embedded Trace Macrocell (256-ball BGA Package Only)

 Low Power: 30.4 mA on VDDCORE, 3.1 mA in Standby Mode

 Additional Embedded Memories

- 16K Bytes of SRAM and 128K Bytes of ROM

 External Bus Interface (EBI)

- Supports SDRAM, Static Memory, Burst Flash, Glueless Connection to CompactFlash®, SmartMedia NAND

 System Peripherals for Enhanced Performance:

Flash

 and

- Enhanced Clock Generator and Power Management Controller

- Two On-chip Oscillators with Two PLLs

- Very Slow Clock Operating Mode and Software Power Optimization Capabilities

- Four Programmable External Clock Signals

- System Timer Including Periodic Interrupt, Watchdog and Second Counter

- Real-time Clock with Alarm Interrupt

- Debug Unit, Two-wire UART and Support for Debug Communication Channel

- Advanced Interrupt Controller with 8-level Priority, Individually Maskable Vectored Interrupt Sources, Spurious Interrupt Protected

- Seven External Interrupt Sources and One Fast Interrupt Source

- Four 32-bit PIO Controllers with Up to 122 Programmable I/O Lines, Input Change Interrupt and Open-drain Capability on Each Line

- 20-channel Peripheral Data Controller (DMA)

 Multimedia Card Interface (MCI)

- Automatic Protocol Control and Fast Automatic Data Transfers

- MMC and SD Memory Card-compliant, Supports Up to Two SD Memory Cards

 Three Synchronous Serial Controllers (SSC)

- Independent Clock and Frame Sync Signals for Each Receiver and Transmitter

- I 2 S Analog Interface Support, Time Division Multiplex Support

- High-speed Continuous Data Stream Capabilities with 32-bit Data Transfer

2-8 MAC 5500 resting ECG analysis system Revision A

2020299-020

Equipment Overview: Theory of Operation

 Four Universal Synchronous/Asynchronous Receiver/

Transmitters (USART)

- Support for ISO7816 T0/T1 Smart Card

- Hardware and Software Handshaking

- RS485 Support, IrDA Up To 115 Kbps

- Full Modem Control Lines on USART1

 Master/Slave Serial Peripheral Interface (SPI)

- 8- to 16-bit Programmable Data Length, 4 External Peripheral Chip Selects

 Two 3-channel, 16-bit Timer/Counters (TC)

- Three External Clock Inputs, Two Multi-purpose I/O Pins per Channel

- Double PWM Generation, Capture/Waveform Mode, Up/ Down Capability

 FPGA Containing:

 XBus Controller  LCD Controller with SDRAM Frame Buffer.  Video Waveform Scroller  Interrupt Controller  System Interrupt Generator  Acquisition Module Interface  Thermal Printhead Interface  Serial EEPROM Interface  BBus Controller  Four PWM Analog Outputs  Beep Generator  PC Card Interface

 A PC Super I/O controller containing:

 Two Serial Ports (one dual mode RS-232 / IrDA)  Clock/Calendar (Y2K compliant)  PS-2 Keyboard Port (for card and barcode readers)

 Three Peripheral Microcontrollers (The Three Stooges):

 System Supervisor / Battery Charger-Gauge (Moe)  Printer Motor Controller / Analog Input (Larry)  Keyboard Interface (Shemp)

Revision A MAC 5500 resting ECG analysis system 2-9

2020299-020

Power Supplies

+3V-C

Equipment Overview: Theory of Operation

The MAC 5500 resting ECG analysis system requires several regulated voltages for operation of its various components. The Main Regulator provides most of the supply rails. The supply rails are:

MAC 5500 resting ECG analysis system is never truly “off.” The system supervisor microcontroller (MOE) must constantly monitor the power key and perform battery charging/gauging. The clock/calendar in the Super I/O chip must also maintain time/date when the machine is off. These functions are powered from the +3V-C rail, which provides power continuously from the battery pack regardless of the state of the rest of the system. The Main Regulator produces +3V-C directly from the battery rail via an internal low current linear regulator. Only 5mA are available from +3V-C, so it must be used sparingly.

NOTE

The MAX782’s low current regulator is dreadfully inefficient. Regulator Q current appears to be about 3x the load current. This makes conservation of load on +3V-C crucial.

+3V-M

+3V-EMI

+5V-M

+5V-EMI

Most of the MAC 5500 hardware runs from +3V-M. The MAX782 provides this rail from the battery via a PWM synchronous switching regulator. Moe controls +3V-M in tandem with +5V-M.

This is simply an RF blocked feed from +3V-M. +3V-M load is contained within the CPU board. Power for devices for external functions is supplied by +3V-EMI. The isolation of +3V-EMI from +3V-M may be unnecessary as the concept has never been tested for its effect.

The MAC 5500 resting ECG analysis system is not fully in the 3V age. The Super I/O and thermal printhead require 5V power. The MAX782 provides this rail via another PWM synchronous switching regulator. Moe controls +5V-M in tandem with +3V-M.

Similar to +3V-EMI, this rail is an RF blocked feed from +5V-M, used to power devices for external functions. The isolation of +5V-EMI from +5V-M may be unnecessary as the concept has never been tested for its effect.

2-10 MAC 5500 resting ECG analysis system Revision A

2020299-020

+18V

+1.8V

+12V

Equipment Overview: Theory of Operation

The Main Regulator’s 5V switching output also supports generation of a non-regulated 18V rail, which is used to provide power for the acquisition module. By providing the acquisition module with 11.5V linearly regulated power from the +18V rail of the main regulator rather than the main 12V regulator (U15), acquisition is not affected by excessive current draw from the printer motor or external loads on the COM ports (esp. KISS pump). The acquisition module's power requirements are modest, so efficiency is not a pressing concern and the lower efficiency of this approach is acceptable.

The Atmel CPU and FPGA (Xilinx Spartan 2) operates their internal core logic at 1.8V, while their I/O ring runs at the system standard 3.3V. The 1.8 Volt regulator, a low dropout linear regulator, drops +3V-M to

1.8V for use as a core supply.

REF2V5

The paper motor drive circuit, LCD backlight and external COM ports all require 12V. The Main Regulator’s 18V output cannot provide sufficient current for all of the systems 12V loads, so a secondary 12V regulator is required. The Main 12V Regulator (U15), a switching buck regulator, provides the higher currents needed by these loads. A P-channel MOSFET (Q1) switch precedes the regulator to provide on/off control. Gate capacitor C12 slows the turn on/off time of the MOSFET switch to eliminate switching transients. The voltage divider created by R135,134 prevents the full supply rail from being impressed across Q1’s gate when on. This protection is necessary, as the maximum Vgs of the MOSFET is less than the peak supply voltage.

The high power rails are neither precise nor quiet enough to be used as the reference for analog input/output or internal measurement circuits. The Analog Reference Regulator (U48), a 2.5V shunt regulator provides a quiet and stable reference voltage for such purposes. VREF is derived from +5V-EMI rather than +3V-EMI to minimize the change in reference current with changes in input rail voltage. The difference between 5V and 2.5V is three times greater than the difference between 3.3V and

2.5V. If the absolute ripple on both supplies is the same, the modulation of reference current will be 3 times less if power is derived from +5V.

Revision A MAC 5500 resting ECG analysis system 2-11

2020299-020

VAna+, VAna-

Clocks

Super I/O and FPGA

Equipment Overview: Theory of Operation

The analog output circuitry is powered by a low current switched 12V rail, provided by the Main Regulator. VAna+ provides the positive supply for the output op-amps. A charge pump voltage inverter is provided to produce an approximate -11V rail for the op-amps. Although only the ECG output is bipolar, all output amplifiers are driven from VAna-. A

short circuit on either of the unipolar DC outputs could load VAnasufficiently to affect the negative peak swing of the ECG output. The ECG and DC outputs are not required to operate correctly in the presence of abnormal loads.

Both of these devices uses the 24 Mhz clock oscillator Y5 to drive their internal requirements for various clock frequencies. The main function of the Super I/O IC is for serial port communication and real time clock; all the needed timing comes from this oscillator. The FPGA provides many functions including the acquisition interface, the printer interface, and the Stooges interface (Bbus) to name a few. The FPGA uses a built-in frequency doubler to raise this 24 Mhz clock to 48 Mhz for internal use. All functions inside the FPGA use the clocks derived from 48MHz. The main derived clocks are:

 1 MHz for acquisition interface

 4 MHz for printer data shift clock interface.

 4 MHz for EEPROM data shift clock

 24MHz for VGA LCD panel clock.

The VGA LCD controller, that include the SDRAM frame buffer controller use 59.904 MHz external memory clock from ATMEL CPU in addition to the 48MHz FPGA clock

CPU ATMEL AT91RM9200

The ATMEL AT91RM9200 has two oscillators. Slow Clock oscillator and Main Oscillator. The Slow Clock Oscillator use 32,768 KHz crystal for clock generation. The CPU runs in Slow Clock mode (@48MHz) after system reset. Slow clock is also used by the built in RTC. But the -006 board do not use the ATMEL RTC for the system timing requirements. The Main oscillator use 18.432 MHz crystal. Processor clock (179.712 MHz), Master clock (59.904) for external Bus Interface and Peripheral Clocks are derived from main oscillator by the Master Clock Controller.

2-12 MAC 5500 resting ECG analysis system Revision A

2020299-020

+ 148 hidden pages