GE 2012250-095A - MAC 1200 Service Manual_SM_2012250-095_D MACTM 1200 ST Resting ECG Analysis System (2018357-003 & 2013503-003 PWAs) Service Manual

GE Healthcare

MAC™ 1200/MAC™ 1200 ST

Resting ECG Analysis System

(2018357-003 & 2013503-003 PWAs)

Service Manual

2012250-095 Revision D

g

NOTE: The information in this manual only applies to MAC 1200 resting ECG analysis system with the 2018357-0 03 or

CAUTION

Software compatibility issue. Attempting to download:

 v6.2 software or later into -002 boards

(PN 2018357-001, 2018357-002, 2013503-001
or 38803267) or

 v6.11 software or earlier into -003 boards

(PN 2018357-003 or 2013503-003)

will render the MAC 1200 unit inoperable.

2013503-003 board and software v6.2. It does not apply to earlier software versions. Due to continuing product innovation,
specifications in this manual are subject to change without notice.

MAC and MUSE owned by GE Medical Systems Information Technologies, Inc., a General Electric company, going to
market as GE Healthcare. All other marks are owned by their respective owners.

© 2010, 2014 General Electric Company. All rights reserved.

T-2 MAC 1200 resting ECG analysis system Revision D

2012250-095 15 August 2014

Compliance

Exceptions

Compliance

The country of manufacture can be found on the equipment labeling.
The product complies with the requirements of standard EN 60601-1-2

“Electromagnetic Compatibility - Medical Electrical Equipment”.
The safety and effectiveness of this device has been verified against previously

distributed devices. Although all standards applicable to presently marketed devices
may not be appropriate for prior devices (i.e. electromagnetic compatibility
standards), this device will not impair the safe and effective use of those previously
distributed devices. See user’s information.

The MAC 1200 resting ECG analysis system EMC: Immunity Performance

Users should be aware of known RF sources, such as radio or TV stations and
hand-held or mobile two-way radios, and consider them when installing a
medical device or system.

Be aware that adding accessories or components, or modifying the medical
device or system may degrade the EMI performance. Consult with qualified
personnel regarding changes to the system configuration.

Revision D MAC 1200 resting ECG analysis system Compliance-1

2012250-095

For your notes

Compliance

Compliance-2 MAC 1200 resting ECG analysis system Revision D

2012250-095

Contents

1 The Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Manual Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Illustrations and Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Basic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Variants of the MAC 1200 resting ECG analysis system . . . . . . . . . . . . . . . . . . . 6

Hardware Functional Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Block Circuit Diagram of Entire Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Mechanical Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Basic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Switching Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

PCB NC Battery Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Charging Circuit for the NC Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Battery-Dependent Device Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

PCB Control CS_CI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Generation of Internal Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Switch On/Off Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

ECG Recording and Front-End Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Controller Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Real Time Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

LCD Graphics Display Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Modem Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Internal Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Mechanical Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Electronic Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Interfaces to Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

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Electronic Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3 System Test Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Test Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Display Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Contrast Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Keyboard Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Motor Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Recording Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

V24 Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Sending and Receiving (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Send Test String to Device (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Send and Receive with Device (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Time and Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Electrode Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Time Constant/Baseline Roll Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Setting the Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Interpretation (International Device Models Only) . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Pace Enhance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Ergometer / Treadmills (JAPAN Device Model Only) . . . . . . . . . . . . . . . . . . . . . . . . 21

ACI-TIPI (US Device Models Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Pharma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

High Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

ii MAC 1200 resting ECG analysis system Revision D

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4 Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Replacing Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Opening the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

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

Basic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

6 Adjustment Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Basic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

7 Service and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Technical Inspections/Preventative Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Visual Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Test Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Safety Analysis Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Maintenance, Cleaning, and Disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

8 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Field Replaceable Units (FRUs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

High Level Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

9 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Basic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Printer Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Paper Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Membrane Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

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Indicators (LEDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Automatic Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Detection of Pacer Pulses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Heart Rate Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Signal Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Data Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Pin Assignment of Data Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Remote Start (Hardware) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Signal Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ECG Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Automatic ECG Gain Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Baseline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Anti-Drift System (ADS) (Cubic Spline) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

ECG Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Blocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Electrode Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Text Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Copy Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Mains Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Battery Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Operational Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Operating Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Recorder Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

10 Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Basic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

High Level Assembly, PN 101 168 01...38, Sheet 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 3

11 Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

High Level Assembly, PN 101 168 01...38, Sheet 2 . . . . . . . . . . . . . . . . . . . . . . . . . . 4

PCB Assembly Drawing, PN 2033914-027 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Schematic, PN 2033914-033, Sheet 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Schematic, PN 2033914-033, Sheet 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Schematic, PN 2033914-033, Sheet 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Schematic, PN 2033914-033, Sheet 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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Schematic, PN 2033914-033, Sheet 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Schematic, PN 2033914-033, Sheet 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Schematic, PN 2033914-033, Sheet 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Schematic, PN 2033914-033, Sheet 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Schematic, PN 2033914-033, Sheet 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Schematic, PN 2033914-033, Sheet 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Schematic, PN 2033914-033, Sheet 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Schematic, PN 2033914-033, Sheet 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Schematic, PN 2033914-033, Sheet 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Schematic, PN 2033914-033, Sheet 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Schematic, PN 2033914-033, Sheet 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Schematic, PN 2033914-033, Sheet 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Schematic, PN 2033914-033, Sheet 17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Schematic, PN 2033914-033, Sheet 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Schematic, PN 2033914-033, Sheet 19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Schematic, PN 2033914-033, Sheet 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

PCB Battery Charge CS_CSI, PN 388 032 90, Sheet 1 . . . . . . . . . . . . . . . . . . . . . . . 26

PCB Battery Charge CS_CSI, PN 388 032 90, Sheet 2 . . . . . . . . . . . . . . . . . . . . . . . 27

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vi MAC 1200 resting ECG analysis system Revision D

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1 The Basics

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For your notes

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About This Manual

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 that are considered field repairable.
Where necessary the manual identifies additional sources of relevant information
and or technical assistance.

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

This manual addresses both MAC 1200/1200ST units (international units) and MAC
1200 units (USA units). Information that is specific to either unit is identified.

Intended Audience

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

The Basics: About This Manual

Definitions

The following formats are used in this manual to highlight various web viewer
features and functions.

Black text Indicates keys on the keyboard, text to be entered, or hardware items such as buttons or

switches on the equipment.

Italicized text Indicates software terms that identify menu items, buttons, or options in various windows.

Ctrl+Esc Indicates a keyboard operation. A (+) sign between the names of two keys indicates that

you must press and hold the first key while pressing the second key once.
For example, “Press Ctrl+Esc” means to press and hold down the Ctrl key while pressing
the Esc key.

<Space> Indicates you must press the spacebar. When instructions are given for typing a precise text

string with one or more spaces, the point where the spacebar must be pressed is indicated
as:

<Space>. The purpose of the < > brackets is to ensure you press the spacebar when

required.

Enter Indicates you must press the “Enter” or “Return” key on the keyboard. Do not type “enter”.

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Illustrations and Names

All illustrations in this manual are provided as examples only. They may not
necessarily reflect your monitoring setup or data displayed on your monitor.

In this manual, all names appearing in examples and illustrations are fictitious. The
use of any real person’s name is purely coincidental.

Revision History

This manual has a revision letter, located at the bottom of each page. This revision
letter changes whenever the manual is updated. Revision A is the initial release of
the document.

The Basics: About This Manual

Table 1. Revision History, PN 2012250-095

Revision Date Comments

A 22 May 2007 Initial release of this manual.
B 31 August 2009 Updated schematics in Chapter 10.
C 14 November 2010 Revised to include services disclaimer addendum.
D 15 August 2014 Updated for RoHS regulatory non-compliance.

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Basic Information

The Basics: Basic Information

This service manual describes software version 6 of MAC 1200 resting ECG
analysis system.

The MAC 1200 resting ECG analysis system is a portable electrocardiograph with
an integrated printing unit. It is used to acquire, record and process ECG signals.

The integrated LCD graphics display shows three ECG channels. It also displays
status information, filter settings, speed/format, gain and the status of the electrodes.

With the setup feature, users can set up the device and the modes for his own needs.
The MAC 1200 resting ECG analysis system offers three modes of operation:

International USA

Automatic 12-lead

Manual 6-lead

Arrhythmia Arrhythmia

ECGs acquired in automatic (12-lead) mode can be transmitted to the MUSE or
CardioSys system directly or via modem.

A NC-battery with a charging circuit is integrated into the unit.
In addition, a pump for the KISS system can be integrated into the instrument as a

separate option.

 NC battery with charging circuit is integrated in general
 Automatic mode with CSI protocol for transmission
 Automatic mode with interpretation (Option Code)
 Automatic mode with storage for up to 40 ECGs (Option Code)

The acquired ECGs can be transmitted to MUSE or CardioSys directly or via a
Modem.

Additionally the MAC 1200 ST can run stress test operating mode (Option
Code).

To control stress test devices the MAC 1200 ST has a modified keyboard with
additional keys for stress test.

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The Basics: Basic Information

Variants of the MAC 1200 resting ECG analysis system

The complete list of the variants is included in Chapter 8, “Parts List”.
The following table gives an overview of the different device models of the MAC

1200 resting ECG analysis system.

Device

MAC1200
MAC1200 ST

MAC1200
MAC1200 ST

MAC1200
MAC1200 ST

MAC1200 RUSS GE Medical

MAC1200 ST Japan GE Medical

MAC1200 Pharma GE Medical

Device

Model

INT GE Medical

Europe 2 GE Medical

USA GE Medical

Hardware Functional Blocks

The main functional blocks for the MAC 1200 resting ECG analysis system are
listed below.

 Switching power supply
 PCB Control CS_CI
 Printing unit
 Keypad
 1/4 VGA graphics display, monochrome

Manufacturer ID Keypad Labeling Mains Voltage

Icons International 230V

Systems

Text International 230V

Systems

Text USA 115V

Systems

Kyrillian International 230V

Systems

Japanese International 230V

Systems

Text USA 115V

Systems

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The Basics: Block Circuit Diagram of Entire Instrument

MAC 1200 (US), Version 6.2

ECG
Input

RS232
Interface

Line

Power

Input

PCB Control SC_CI

Modem Supply

Boot Loader

Program

Memory

Configuration

Memory

Internal

RAM

ECG RAM

Buffered

RS232

Driver

Keypad

Interface

Display

Interface

Display

Supply

Motor

Control

Thermal
Pinhead

Control

Device
On/Off

Control

Logic Supply

+5 V +3.3 V

Analog
Supply

Printhead

Supply

Real Time

Clock

Buffered

Controller

Core

ECG

Acquisition

and

Conditioning

NC Battery

PCB NC

Battery
Charge

Switching

Power

Supply

+26.5 V

Line Power

Input with

Fuse

Printing Unit

Thermal Printhead

Motor

LCD Graphics Display
1/4 VGA Monochrome

Keypad

Pump Interface

(not in US

Device)

Option Pump

(Not in US Device)

Line Power, NC Battery

Block Circuit Diagram of Entire Instrument

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The Basics: Mechanical Components

Mechanical Components

The main mechanical components comprise the upper and lower shell of the MAC
1200 resting ECG analysis system. The lower shell serves as a basic unit to receive
the following assemblies.

 Line power input module with fuse
 Switching power supply
 NC Battery
 PCB NC Battery Charge
 PCB Control CS_CI
 Graphics display
 Thermal printing unit
 Paper container

The upper shell accommodates the keypad, which is connected to the PCB Control
CS_CI via a 26-pin connector.

The MAC 1200 resting ECG analysis system can be opened by releasing 5 screws
at the bottom of the lower shell, opening the paper flap and lifting up the upper shell
a little bit to remove the keypad cable from the PCB Control CS_CI. The upper shell
then can be removed completely.

To replace the NC Battery, the battery flap at the bottom of the lower shell must first
be unlocked with a screw-driver before it can be removed.

The 15-pin input connector to connect the patient cable and the 9-pin connector for
the RS-232 interface are located directly on the PCB Control CS_CI.

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2 Functional Description

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For your notes

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Basic Information

Functional Description: Basic Information

The block circuit diagram of the entire instrument in Chapter 1, “Block Circuit

Diagram of Entire Instrument” and the functional blocks of circuit diagram sheets

(P-plans) describe the individual functional blocks.

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Functional Description: Switching Power Supply

Switching Power Supply

The switching power supply generates the fundamental device voltage for the PCB
Control CS_CI and for the PCB NC Battery Charge. It has the following input
specifications.

Input voltage range: 85 ... 264 Vac
Line frequency range: 47 ... 65 Hz
The output voltage is +26.5 Vdc, the maximum load is 1.5 A.

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Functional Description: PCB NC Battery Charge

PCB NC Battery Charge

The MAC 1200 resting ECG analysis system can operate on battery power. With a
new, fully charged NC battery, up to 50 ECGs can be recorded in Automatic (12­lead) mode.

The PCB NC battery charge controls and monitors the charging process, depen d i ng
on the status of the battery and the status of the device.

Charging Circuit for the NC Battery

An integrated charging device is used to charge the battery. During charging, it
monitors the battery voltage function and switches over from rapid charging to
trickle charging.

Applying the line power to the MAC 1200 resting ECG analysis system, or
insertion of the battery activates the charging circuit. During a recording, the
charging current is reduced. In standby mode, a depleted battery is fully charged
within 4 hours.

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Functional Description: PCB NC Battery Charge

Battery-Dependent Device Behavior

Depending on the status of the battery and the status of the device, the following
behavior occurs.

State 1 Battery depleted, line power supply is connected up

Battery charged in rapid mode; when fully charged, switchover to trickle charging.

State 2 Battery full, line power supply is connected up

Battery charged in rapid mode for some minutes till the charging circuit recognizes battery
full, then switchover to trickle charging.

State 3 Battery depleted, no line power supply, device is switched on

Device inoperative.

State 4 Battery full, no line power supply, device is switched on

Device fully operative. When battery is almost depleted, the LEDBAT signal is activated to
indicate that the device should be charged by connecting to the line power supply. If the
operation is continued without line power, MAC 1200/ 1200 ST will shut down itself when a
minimum level is reached to prevent the battery from a excessive discharge.

Table 1. Battery State

State 5 Battery depleted, line power supply is connected up, device is switched on

Battery is charged in rapid mode, device is fully operative, including recording. During
recording, the charging current is reduced. If a lot of recordings take place in this phase,
the battery is not fully charged within 4 hours.

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Functional Description: PCB Control CS_CI

PCB Control CS_CI

The PCB Control CS_CI is the main board of the MAC 1200 resting ECG analysis
system. The main board accommodates the control functions of the device, except
the line power supply and the NC battery-charging controller.

Generation of Internal Power Supplies

Logic Power Supply +5 V and +3.3 V

The processor core and the memory is a fully +3.3 V design. The interface functions
to display, to RS-232, to the printing unit and to the ECG acquisition unit are
supplied with +5 V.

Both the +3.3 V and the +5 V are generated separately by a clock-rated voltage
controller. By using the “adjustable version” of the voltage controller, both supplies
are based on the same voltage controller. The output voltage is determined by
appropriate dimensioning of the voltage divider at the feedback input of the voltage
controller.

Standby Supply +5 VSTB and +3.3 VSTB

The standby supply + 5VSTB supplies the ON/OFF Control, the + 3.3 VSTB
buffers the patient ECG memory when the device is turned off. Both supplies are
generated together from one low-power linear regulator with low quiescent supply
current.

Analog Supply +12 V

+12 V is used for the heating control and temperature monitoring of the printing
unit, which requires only a current of a few milliamperes. This supply is generated
by a linear regulator with feedback input.

FPGA Power Supply +2.5V +1.25V

+2.5 V is the auxilliary source of power and +1.25 V is the main power supply for
the FPGA internal logic. These voltages are generated by Dual Output Low Dropout
Regulator.

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Switch On/Off Circuit

Device On Sequence

Device Off Sequence

Functional Description: PCB Control CS_CI

The Switch On/Off circuit consists of the On/Off control and the Voltage control.
The On/Off control switches the device on or off by switching the device supplies

+UVERS and +USUPPSW. The On/Off control is supplied from the +5 VSTB.

The transition from device Off state, or Standby state when line power is connected,
to device On state can only be activated by pressing the On/Off button.

The transition from device On state to device Off state or Standby state when line
power is connected can be achieved as follows.

 Pressing the On/Off button.
 When the control core activates the signal DEV_OFF.
 When the voltage control applies the signal REG_OFF_, because the battery

voltage gets too low during battery operation.

The Voltage Control controls the battery voltage during battery operation.
The signal BATT_LEV2 indicates that the battery charge has gone down, and the

device should be connected to the line power soon.
The signal BAT_LEV1 indicates that the battery has been discharged almost

completely, the device should be connected to the line power immediately,
otherwise the device will shut down within few minutes.

If battery discharge is continued without connecting to the line power, the signal
REG_OFF_ is activated and the device is switched off.

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Functional Description: PCB Control CS_CI

ECG Recording and Front-End Processing

The patient input is classified as being cardiac floating and is defibrillation-proof.
The patient leads are connected with a 15-pin connector with a special form for the

specified and released patient cables for the MAC 1200 resting ECG analysis
system.

The main element of the ECG recording and front-end processing is a set of chips
comprising 3 ASICs. Pace detection is realized by a separate circuit.

Every disconnected electrode is detected by a special AC measurement, which
allows higher impedance between electrode and patient.

N common-mode compensation ensures suppression of interference, at the same
time serving to improve the in-phase suppression of the input electrodes.

To protect patients, the ECG recording and front-end processing are assembled as
floating components. Digital signals from and to the controller core are transmitted
via opto-electronic couplers. The floating supply ±5 V is generated by an isolated
flyback converter from the +5 V logic power supply.

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Controller Core

Functional Description: PCB Control CS_CI

The actual core comprises the Motorola Power PC MPC855T, which contains the
following integrated components.

 Chipselect logic
 DRAM controller
 SCC and SMC for RS-232
 SPI interface
 I/O ports
 Real-time clock counter register

In addition, the MPC855T contains a JTAG port with test and programming
capabilities.

The MPC855T has the following additional power supplies.

 VDDSYN, filtered from the +3.3 V logic supply, for the clock generation.
 KAPWR, generated from the +3.3 V logic supply or from a battery when device

is off, used for buffering the RTC Counter Register.

The clock generation for the MPC855T is realized by a quartz oscillator with 32.768
KHz. The system clock CLOCKOUT is adjusted with the internal PLL register. The
system frequency is 25 MHz.

The watchdog/reset generation is implemented separately in an integrated system
monitoring chip. It has the following functions.

 Power-up reset for the MPC855T when the device is switched on.
 Voltage monito ring of the +3.3 V and +5 V with reset generation.
 Watchdog
 Switchover to battery supply for patient ECG memory when device is switched

off.

 Signal for access protection for patient ECG memory when device is switched

off.

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Real Time Clock

Functional Description: PCB Control CS_CI

The Reset Configuration defines startup conditions like boot port size and clock
generation source.

Four LEDs indicate the device status in addition to the following.
LED1: Active when a HRESET_ occurs.

LED2: Indicator for the logic supply.
LED3, LED4: Indicate internal software states.

The control register comprises device control signals to switch off the device,
control battery charging and display control signals.

The status register contains information on the device hardware configuration and
the state of the battery charge.

With software version 6, two options for the real time clock are supported. The
software checks for an external real time clock chip (X13 on PWA control). This
chip is available with Index G of PWA Control CS_CI and Index F of PWA Control
CS_C.

If the external RTC is found, it will be used for the clock function. If not, the internal
clock of the MPC855T will be used. The external RTC is more accurate than the
internal one. Both clocks are buffered by the voltage KAPWR.

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Memory

Program Memory

DRAM

Functional Description: PCB Control CS_CI

The complete memory of the MAC 1200 resting ECG analysis system is located
on the PCB Control CS_C(I). The software of the device can be loaded through the
JTAG port during the production process, or for service purposes with the
appropriate programming software through the RS-232 interface.

Type: Flash, +3.3 V supply
Organization: 2Mbit X 16, 4Mbyte
Wait states: 1 wait state

Type: SDRAM, +3.3 V supply
Organization: 4Mbit X 16, 8Mbyte
Wait States: 0 wait state

Patient ECG Memory

Type: Buffered SRAM, +3.3 V supply
Organization: 512Kwords X 16 bits
Wait States: 1 wait state

Configuration Memory

The configuration memory is part of the program memory Flash. With special
hardware and software protection facilities, write access to the Flash is only possible
in the defined configuration memory of the Flash. Thus an external configuration
memory like an EEPROM is not required.

LCD Graphics Display Interface

The LCD controller is now implemented in FPGA.

Controller Interface

For the digital control signals, delivered from the MPC855T, only an output driver is
required.

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LCD Power Supply

Adjusting Contrast

Backlight

Functional Description: PCB Control CS_CI

The LCD power supply VEE of –23 V is generated from the +5 V logic supply. The
generation starts after HRESET_ becomes inactive to ensure that the logic supply of
+5 V first is applied to the display.

Contrast adjustment of the display is accomplished with the contrast voltage V0.
The level of V0 is controlled with the PWM signal BLCD_CONTR from the timer
module of the MPC855T. In
compensated.

The LCD backlight converter for the CCFL tube is located on the PCB Control
CS_CI too. The backlight converter is generated from the +5 V logic power supply.

The signal BLCD_ENBA switches the backlight on or off. The user can define the
backlight active time in the configuration menu.

addition, the contrast voltage is temperature

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Keypad Interface

Printhead Control

Functional Description: PCB Control CS_CI

The keypad interface contains the control register for 8 keypad columns and the
receiving register for 7 keypad rows, and the control signals for the status LEDs:
LED_LIN, LED_BATT_, LED_START, and LED_STOP.

Using the matrix of 8 x 7, up to 56 keypads can be detected. Identification of the key
pressed is as follows.

 The controller activates a column, activation is via low-level, then the row-

register is read to identify the pressed key by a low-level. This procedure is
repeated with the next column, till all columns have been activated.

The printhead controller takes on the complete control of the 216-mm thermal
printhead with a line width of 200 mm.

The output rate to the printhead is 1000/second. The resolution in the Y-direction is
8 dots/mm, in the X-time axis up to 40 dots/mm.

Thermal Printhead Dot Control

The MPC855T prepares a complete dot column and sends it to the FIFO. An FPGA
reads out a complete column of the FIFO and generates the digital control signals for
the printhead, which are shifted in series.

The duration of heating a dot column is defined through the pulse width of the PWM
Signal HEAT that is generated from the FPGA too.

In addition, the duration of heating a dot column is influenced by the thermal
printhead monitoring.

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Functional Description: PCB Control CS_CI

Thermal Printhead Temperature Monitoring

The thermal printhead temperature monitoring measures the temperature of the
thermistor, located on the printhead. A constant current source effects a
temperature-dependent vol tage drop.

If a printhead temperature of 55°C is exceeded, the signal REC_OVHEAT is
activated and the heating of the printhead is prevented by disabling the signal
STROBE.

Only when the printhead temperature drops below 50°C is the signal REC_OVHEAT
disabled and the heating via the signal STROBE reenabled.

In addition, a continuous reduction of the heating duration occurs with increasing
printhead temperature, resulting in a regular typeface throughout the entire
temperature range.

Motor Control

Paper transportation for the speeds 5 mm/s, 25 mm/s and 50 mm/s is driven by a
stepping motor. The stepping motor is controlled by an integrated stepping motor
driver circuit. The current for the motor is adjusted by the sense resistors of the
stepping motor driver.

For the speed 5 mm/s, the motor current is reduced, triggered by the signal
LOW_SPEED.

The motor speed is controlled by the frequency of the signal RECTMR_STEP, which
is generated by the timer unit of the MPC855T. The driver circuit is enabled by the
signal REC_MOTEN, the driver is powered from +22.5 V.

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RS-232 Interface

Functional Description: PCB Control CS_CI

The MAC 1200 resting ECG analysis system has an RS-232 interface accessible
with a 9-pin Sub-D connector.

Except for the RS-232 driver chip, the interface is integrated into the control core of
the MPC855T.

The interface has the following attributes.

 Hardware handshake with the signals RTS and CTS.
 Software handshake with XON/XOFF.
 Transmission speeds from 4800 ... 57600 Baud.
 Maximum input voltage range: ±15 V.
 Minimum driver output voltage: ±5 V.
 Maximum ESD interface protection: ±10 kV.

The MAC 1200 resting ECG analysis system provides a remote start input on the
RS-232 interface. The MAC 1200 resting ECG analysis system US device
additionally provides a modem power supply output on the RS-232 Interface.

Buzzer

The buzzer is an integrated signal generator with fixed frequency, directly operating
from the +5 V logic power supply.

Activating and deactivating is controlled with the signal SPEAKER.

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Modem Supply

Functional Description: Modem Supply

PCB Modem Supply CS_M is no longer used in MAC1200 units equipped with ­003 boards. The modem power supply is now integrated onto the main board
(2018357-003 and 2013503-003). The main board generates a supply voltage of +8
Vdc, to operate a special GE modem direct on the RS-232 interface on the MAC
1200 device without the need for an external power supply for the modem.

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Functional Description: Internal Interfaces

Internal Interfaces

Mechanical Interfaces

Mechanical interfaces are described in “Mechanical Components” on page 1-8.

Electronic Interfaces

This section describes the pinning, function and significance of the signals on the
internal interfaces of the functional components.

Interface to the Switching Power Supply

The interface to the switching power supply is realized by the connector POSUP/ on
the PCB Control CS_CI.

Connector denotation: POSUP/
Type: Male connector 1 x 4-pin., 180°, AMP MODU I

Reverse terminal protection achieved mechanically

The function of the individual pins is given in the table. The d efini tion as an in put /
output is seen with reference to PCB Control CS_CI.

POSUP/

Pin Number

1 +24VPS Input Voltage from power supply +26.5 V
2 +24VPS Input Voltage from power supply +26.5 V
3 GNDPS Input GND from power supply
4 GNDPS Input GND from power supply

Interface to the PCB NC Battery Charge

This interface has the supply for battery charging, charging control and status
signals and the battery voltage from the PCB NC battery charge.

Connector denotation: BATT/
Type: Male multipoint connector 2 x 10-pin, 180°

Signal

Name

Input/

Output

Reverse terminal protection and coding with coding pin
15

Function Definition

The function of the individual pins is given in the table below. The definition as an
input/output is seen with reference to PCB Control CS_CI.

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Functional Description: Internal Interfaces

BATT/

Pin Number Signal Input/Output Function Definition

1 +24V Output Supply battery charging
2 +24V Output Supply battery charging
3 +24V Output Supply battery charging
4 Code Coding Pin
5 NC
6 GND24V Common Ground
7 GND24V From power supply
8 GND24V After ferrite decoupling

9 GND24V
10 +UBATT Input Battery voltage
11 +UBATT Input Battery voltage
12 +UBATT Input Battery voltage
13 +UBATT Input Battery voltage
14 +UBATT_ME Input Battery measuring output
15 Code Coding Pin
16 +5V_L Output +5 V supply
17 NC
18 BATT_OPT_ Input Status option battery 0: Option active
19 LOAD_OFF Output Charging reduction 1: Reduced charging
20 NC

Interface to the LCD Graphics Display

The interface to the LCD graphics display provides the LCD data signals, the
display supply voltages +5 V and VEE, the display contrast voltage V0 and the
display on/off control signal.

Connector denotation: HOS/
Type: Foil connector, 14-pin, zero power insertion, 180°
The LCD supply voltage VEE can be measured at R 731 on the PCB Control

CS_CI, the LCD contrast voltage can be measured at R 730. Both levels of these
voltages depend on the contrast selected.

The voltage supply for the CCFL tube of the display is provided separately via the
connector BL/.

CAUTION

Do not touch. High AC voltage.

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Interface to the Keypad

Interface to the Printhead

Printhead Supply

Functional Description: Internal Interfaces

The interface to the keypad is realized with the connector KEYB/. It contains the
signals for the keypad rows and columns, the supply and the control signals for the
status LEDs of the keypad. The foil connecting cable is part of the keypad itself.

Connector denotation: KEYB/
Type: Foil connector, 26-pin, zero power insertion, 180°, grid

1.0 mm, Molex

The control data to the printhead is transferred via the flexible PCB Printhead
Connection, plugged into the connector TPC_DAT/ on the PCB Control CS_CI.

Connector denotation: TPC_DAT/
Type: Male connector 1 x 20-pin, 180°

TPC_PO

The printhead is supplied through a 6-pin connection cable, plugged to the connector
TPC_PO on the PCB Control CS_CI.

Connector denotation: TPC_PO
Type: Multipoint connector 1 x 6 pin, 180°,

Reverse terminal protection, MODU II

The function of the individual pins is given in the table below.

Pin Number Signal Function

6 COMMON Supply Voltage +22.5 V
5 GNDITPC Ground
4 COMMON Supply Voltage +22.5 V
3 COMMON Supply Voltage +22.5 V
2 GNDITPC Ground
1 +22.5V Auxiliary Voltage

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Functional Description: Internal Interfaces

Interface to the Motor

The motor control signals are supplied through a 6-pin connection cable, plugged to
the connector MOTOR/ on the PCB Control CS_CI.

Connector denotation: MOTOR/
Type: Multipoint connector 1 x 6 pin, 180°,

Interfaces for Production Tests

Debug Port

The debug port is an interface for developing purposes. With the corresponding
tools, the MPC855T can be set to the debug mode, to show internal states.

Connector denotation: BDM/
Type: Male connector, 2 x 5-pin, 180°

JTAG Port

The JTAG is an interface for the production test of the processor core and the
memory. In addition, the Flash memories can be programmed with this interface.

Reverse terminal protection, MODU II

Connector denotation: JTAG/
Type: Male connector, 2 x 5-pin, 180°, Pin 7: coding pin
The function of the individual pins is given in the table below . The defin ition as an

input/output is seen with reference to PCB Control CS_CI.

JTAG/

Pin Number Signal Input/Output Function Definition

1 TMS Input JTAG Test Mode Select
2 TRST_ Input Reset for Scan Chain Logic 0: Reset active
3 TDI Input Data In for JTAG Mode
4 TDO Output Data Out for JTAG Mode
5 TCK Input Serial Clock for JTAG
6 GND Logic Ground
7 PORESET_ Bi-direct Power On Reset 0: Reset active
8 EN_BJHRES_ Input Enable buffered HRESET 0: HRESET _ enabled.
9 WE[0] Bi-direct Write Enable [0] 0: Write enable

10 WE[1] Bi-direct Write Enable [1] 0: Write enable

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Functional Description: Internal Interfaces

In Circuit Programming Port

With the In Circuit Programming Port, both CPLDs can be programmed or updated
in a Daisy Chain queue.

Connector denotation: ISP/
Type: Male connector, 2 x 5-pin, 180°, Pin 4: coding pin
The function of the individual pins is given in the following table. The definition as

an input/output is seen with reference to PCB Control CS_CI.

ISP/

Pin Number Signal Input/Output Function Definition

1 ISP_SCLK Input Serial ISP Clock
2 GND Logic Ground
3 ISP_MODE Input ISP Mode Select
4 NC Not connected
5 NC Input Not connected 0: ISP enable
6 ISP_SDI Input Serial Data In
7 ISP_SDO Output Serial Data Out
8 +2.5V Logic supply
9 NC

10 NC

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Functional Description: Interfaces to Peripherals

Interfaces to Peripherals

The MAC 1200 resting ECG analysis system has only 3 interfaces for peripherals.

 Mains input
 Patient input
 RS-232 interface

The mains input interface on the device is a 3-pin standard cold appliance socket
connection, which is integrated into the mains input module. Connection to the
mains is effected via a 3-pin power cord with a non-fused earth conductor.

The mains input is a wide range input from 95 Vac ... 240 Vac. The mains input
module contains the two primary fuses.

When replacing these fuses, the following points need to be observed.

 Replacement by factory or servicing agent only.
 Disconnect mains plug.
 Replacement only with the original fuses.

For the patient input, the mechanics of the patient input of the MAC 500 is used, so
the patient cables of the MAC 1000/CardioSmart cannot be used for the MAC
1200 resting ECG analysis system.

A 9-pin sub-D Connector, type Mark II with 4-40 UNC inserts, with a standard
configuration of the signals TXD, RXD and GND is implemented in the
construction of the RS-232 interface.

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Electronic Interfaces

RS-232 Interface

RS232

Functional Description: Interfaces to Peripherals

The 9-pin sub-D Connector of the RS-232 interface is implemented on the PCB
Control CS_CI directly.

From Version V1.1, the remote start input pin is available on pin 8.
In MAC1200 US devices the modem supply output +8 V is available on pin 6

additionally.
Connector denotation: RS232
Type: 9-pin sub-D, female, Mark II with 4-40 UNC inserts
The function of the individual pins is given in the table below. The definition as an

input/output is seen with reference to PCB Control CS_CI.

Table 2. RS232 Pin Position

Pin Number Signal Input/Output Function Definition

1 NC
2 RXDE Input RS232 Data In
3 TXDE Output RS232 Data Out
4 NC
5 GND Signal Ground
6 V_MODEM Output Modem Supply +8 V MAC1200 US only
7 RTSE Output Request to Send
8 FERNST Input Remote Start Input 0: active
9 NC

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Functional Description: Interfaces to Peripherals

Patient Input

The connection to the patient cable is realized with a 15-pin female sub-D
Connector, implemented on the PCB Control CS_CI directly. The mechanical
plastic housing ensures that only patient cables that have been released for use with
the MAC 1200 resting ECG analysis system system can be used.

Connector denotation: J1
Type: 15-pin sub-D, female

J1

Table 3. EKG Pin Position

Pin Number Signal Input/Output Function Definition

1 C2 Input Chest lead V2
2 C3 Input Chest lead V3
3 C4 Input Chest lead V4
4 C5 Input Chest lead V5
5 C6 Input Chest lead V6
6 Shielding Output Shielding AVSS
7 Cable Input Identification: patient cable used 0: patient cable used
8 Cable

identification

9 R (RA) Input Electrode right arm
10 L (LA) Input Electrode left arm
11 F (LL) Input Electrode left leg
12 C1 Input Chest lead J1
13 NST Input Nehb electrode NST
14 N (RF) Output Electrode right leg
15 NAX Input Nehb electrode NAX

Input 5/10-pin or 12-pin cable used 0: 12-pin cable

1: 5- or 10-pin cable

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Limitations

Functional Description: Limitations

The following operating modes are not implemented in the MAC 1200 resting
ECG analysis system.

 No SpO2
 No spirometry
 No late potentials, no RR variability
 No phono, no US Doppler
 A scope output is not available.
 No analog inputs.
 No ECG trigger output.
 Lead acid accumulators cannot be used.
 Primary cells cannot be used.

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3 System Test Function

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For your notes

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System Test Function: General Information

General Information

NOTE

All messages displayed during the self-test are in English.
The functions for the system test are mostly menu-guided.
Some tests require special auxiliary resources. These include interface testers or PC,

connection cables, signal generators, etc. These auxiliary resources are described in
the various test descriptions.

The master password used to override all other passwords is SYSTEM.

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Test Start

System Test Function: Test Start

After simultaneously pressing the keys Shift + 12 Lead (or Auto), the initial display
menu appears, so you can select a specific test. The specific test functions are
activated by pressing the corresponding key.

Table 1. Hardware Tests

International version

Key Test Performed Key Test Performed

1 Display test 1 Display test
2 Keyboard 2 Keyboard
3 Motor test 3 Motor test
4 Test results 4 Test results
5 Recording test 5 Recording test
6 V24 tests 6 V24 tests
7 Time and date 7 Time and date
8 Electrode test 8 Electrode test
D Device model D Device model
H Interpretation N Serial number
N Serial number O ACI-TIPI

O

Ergometer/Treadmill

X End (Terminate hardware tests)

1

3

X End (Terminate hardware tests)

US version

2

1. Applies to all device variants except US and Pharma.

2. Applies to US and Pharma device variants.

3. Applies to Japan device variant.

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Display Test

System Test Function: Display Test

After pressing the 1 key, the following menu appears.

Table 2. Display Test

Key Test Performed Function

1 Test pattern Pressing this key generates a vertical stripe

pattern. Each subsequent pressing generates the

inverse display of its predecessor.
2 Clear display All display pixels are inactive.
3 Restore menu The initial display test menu is displayed.
4 Display illumination The illumination is switched on or off by pressing

this key.

Contrast control

 Shift + Cursor_Down
 Shift + Cursor_Up

Contrast Control

Terminate with any key.
Pressing any other key than one of those listed in the menu above leads back to the

initial display menu.

The contrast setting can always be adjusted as described above (cursor keys).

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Keyboard Test

System Test Function: Keyboard Test

When the 2 key is pressed, the following menu appears.

Table 3. Keyboard Test

Key Test Performed

B Bleeper Test
E End

When a key is pressed, this key or its function is displayed. This can either occur by
a triple character display, e.g., “AAA” or as a text, e.g., “CURS_UP”. Moreover,
pressing the B key tests the bleeper (audible sound). The keys ALT and SHIFT only
in combination with another key. The “E” key terminates this test and
simultaneously initiates a self-test.

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Motor Test

System Test Function: Motor Test

When the 3 key is pressed, the following menu appears.

Table 4. Motor Speed Test

Key Test Performed

Format/Speed Speed selection motor

Start/Stop Start/Stop motor

Terminate with any key.
The speed select key is used to set the required speed and the motor is set into

motion with Start/Stop.
A marking pulse is set once every second. The running speed can then be calculated

or its accuracy checked from the distance between marking pulses. Pressing a key
that is not included in this menu will return you to the initial display menu.

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Test Results

System Test Function: Test Results

Pressing the 4 key triggers the output of the test results.
The output of the test protocol supplies the following information.

 Time and date
 Device serial number
 Device model
 Software release
 ECG time constant
 Battery voltage
 Test results
 Memory used (ROM, RAM)
 Base address
 Size

Following output, the initial display menu reappears automatically.
The identification of the Hardware Version is given by the item “Remote Control

yes/no”.
“No” indicates Hardware Version V 1.0 (no remote control), “yes” indicates

Hardware Version V1.1 or V1.2.

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Self-Test

Error Codes

System Test Function: Self-Test

The test results outlined in “Test Results” on page 3-8 are gathered during the self­test, which is always performed on power-up. if errors are detected, a message
appears on the display after the test, indicating the possible errors. The following
error codes are used to identify the error.

The following error codes appear on the display together with the message Self-test
failed.

ERROR_CODES: 0 Reserved

1 VEKT – error in vector table
2 DRAM – DRAM error
3SRAM – SRAM error
4 Reserved
5 Reserved
6 Reserved
7 Reserved
8 ROMB – ROM error (checksum) in the FLASH
9 Not used
10 Not used

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Recording Test

System Test Function: Recording Test

The recording test is activated by pressing the 5 key.

A window with 2 channels is displayed.

Table 5. Motor Speed Test

Key Test Performed

Speed Selects the speed

Start/Stop Starts and stops a real time 2 channel recording

The selected speed and sensitivity are displayed.
Terminate with any key.

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V24 Tests

System Test Function: V24 Tests

Several possibilities are available to test the serial interface. Signal transmission and
receiving of the interface can be tested by an internal feedback from TXD and RXD.
Signal transmission and receiving can also be tested with a remote station.

For the test with a remote station, the connection cable from MAC 1200 resting
ECG analysis system to PC, PN 223 362 03 is required. In addition, the following
transmission protocol should be adjusted at the remote station.

 1 start bit, 8 data bits, no parity
 1 stop bit
 Baud rate 19200

Pressing the 6 key calls up the following menu.

Table 6. Interface Test

Key Test Performed

1 Sending and receiving
2 Send test string to device
3 Send/Receive with device
A Abort (terminate interface test)

Sending and Receiving (1)

This test enables complete testing of the RS232 signal path for transmitting and
receiving, including RS232 driver and connector.

This test requires an RS232 connector with an internal bridge from pin 2 (RXDE) to
pin 3 (TXDE). Depending on the result of the test, the following message appears.

If test result is OK: Out: Hello world!

If an error occurs: Out: Hello world! 

Send Test String to Device (2)

In this test a remote station, e.g., PC must be connected up and have a terminal
program which can receive signals and be configured for the above-mentioned
protocol. If the remote station is on receive, then every time the 2 key is pressed the
test string Hello world! is transmitted to the remote station. Simultaneously, the
following message appears on the display.

 v24-Settings: 19200, 8, n, 1
 Out: Hello world!



In: Hello world!

In: ERROR (In)

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System Test Function: V24 Tests

Send and Receive with Device (3)

Sending and receiving can be tested with a remote device by pressing the 3 key. The
device should be connected as described in

After pressing the 3 key a test string is sent to the remote station. The following
message appears on the display.

 Transmitting: Hello world!
 Receiving: [ ]

A subsequent input at the remote station is sent back to the device and displayed
there. Moreover, it should be noted that an input must take place within 10 seconds
and the input terminated with the return key.

“Send Test String to Device (2)”.

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Time and Date

System Test Function: Time and Date

Follow these instructions for checking and setting the time and date.
Pressing the 7 key calls up the following display.

Table 7. Time and Date

Time (hh:mm) [18:25:29]

Date (dd.mm.yyyy) [03.03.2003]

X End

To set time or date, select the corresponding time or date field by pressing the return
key. A cursor is not displayed while numbers are entered.

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Electrode Test

System Test Function: Electrode Test

The electrode test is started by pressing the 8 key.
The following menu is displayed.

Table 8. Electrode Test

Electrode Test
Terminate with any key
Select pace electrode (key P)
Pace electrode LA
Cable = 10 electrodes (or no cable)

The status of each electrode is displayed. Electrode OK or disconnected is displayed
as follows.

Status = 0 -> Electrode OK
Status = 1 -> Electrode disconnected

With the P key, the pace electrode can be selected. The selected pace electrode is
displayed.

The status cable indicates if a cable is connected to the patient ECG input or not.

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System Test Function: Time Constant/Baseline Roll Filter

Time Constant/Baseline Roll Filter

Beginning with software release V5.2, the time constant can no longer be set in the
service mode. It is accessible in the user mode under “System Setup”, Baseline roll
filter, 0.04 Hz, 0.08 Hz, 0.16 Hz.

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System Test Function: Setting the Device Model

Setting the Device Model

The setting of the device model is activated by pressing the D key, the following
display image appears.

1 INT
2 USA
3 Europe 2
4 JAPAN
5 RUSS
6 PHARMA (US devices only)
X End

Table 9. Device Model

WARNING

Changing the device model affects the selection of the output
formats and languages available, and can switch the program for
interpretation from HEART to 12 SL, or vice versa. The default
configuration settings, e.g., override function yes/no, line filter 50/
60 Hz, are also affected.

The device model configured during manufacture should only be
changed when deemed really necessary.

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System Test Function: Setting the Device Model

The table below shows the most important combinations:

Table 10. Model Combinations

Default Settings

Device Model Interpretation Output Formats Languages

Override

Function Enabled

Line Filter

1 INT HEART international international no 50 Hz
2 USA 12SL USA e yes 60 Hz
3 Europe 2 12SL international international yes 50 Hz
4 Japan 12SL international e, jap no 50 Hz
5 RUSS HEART international e,r no 50 Hz
6 Pharma 12SL USA e no 60 Hz

- Language international: g, e, f, i, s, por, sw, nor, fin, dan, hol, czech, hung

- Europe 2: United Kingdom, Benelux, Scandinavia

The required device model is selected by pressing the appropriate key, 1 to 6.
Quit selection menu by pressing the X key.
Quit the self-test with X key.
MAC 1200 resting ECG analysis system configures the appropriate items and

initiates a cold start automatically. Thus, when the device is rebooted automatically
all the new settings are adopted.

Selecting a particular device model leads to the configuration of the program fo r
interpretation as indicated in the table above, even when the interpretation program
was configured differently beforehand as described in

“Interpretation (International

Device Models Only)” on page 3-18.

NOTE

When configuring the device model, saved ECGs are not lost.
If a new device model is selected, the program for interpretation is switched

over. When printing the saved ECGs, the display in the status line is related to
the currently enabled program for interpretation, although the results are based
on the program previously configured.

In this case, the saved ECGs should be printed out or transferred to a PC before
configuration of the new model.

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System Test Function: Interpretation (International Device Models Only)

Interpretation (International Device Models Only)

Switching over the program for interpretation is activated by pressing the H key, the
following display image appears:

Table 11. Interpretation

1 HEART
2 12SL

X End

The currently enabled interpretation program appears in reverse video.

WARNING

Switching over to another program for Interpretation affects the
measurement results and the interpretation.

The program for Interpretation configured during manufacture should only be
changed when deemed really necessary.

The required program for Interpretation is selected by pressing the appropriate key,
1 or 2.

Quit the selection menu by pressing the X key. Quit the self-test with the X key.
MAC 1200 resting ECG analysis system configures the appropriate items and

initiates a cold start automatically. Thus, when the device is rebooted automatically
all the new settings are adopted.

NOTE

When configuring the device model, saved ECGs are not lost.
When printing the saved ECGs, the display in the status line is related to the

currently enabled program for interpretation, although the results are based on
the program previously configured.

In this case the saved ECGs should be printed out or transferred to a PC before
switching over to the new program for interpretation.

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Pace Enhance

System Test Function: Pace Enhance

Beginning with software release V5.2, the Pace Enhance mode can no longer be set
in the service mode. It is accessible in the user mode under “System Setup”, Pace
Enhancement, YES or NO.

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Serial Number

System Test Function: Serial Number

The serial number of the device is displayed by pressing the N key.

 The serial number is only displayed and cannot be changed.
 The serial number is entered during the manufacturing process.
 After replacing the PCB Control CS_CI, during the power up sequence, the

serial number of the device has to be entered.

Terminate with the X key.

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System Test Function: Ergometer / Treadmills (JAPAN Device Model Only)

Ergometer / Treadmills (JAPAN Device Model Only)

Enable or disable ergometer/treadmill functionality in the Japanese device model by
pressing the “O” key. The following display image appears.

Table 12. Ergometers / Treadmills

1 YES (drivers are available in Stress Test mode)
2 NO (not available)

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System Test Function: ACI-TIPI (US Device Models Only)

ACI-TIPI (US Device Models Only)

Enable or disable ACI-TIPI functionality by pressing the “O” key, the following
display image appears:

Table 13. ACI-TIPI

1 ENABLE
2 DISABLE

X End

NOTE

ACI-TIPI can be DISABLED in the service mode at any time, independently of
the the Patient Data Setup screen.

However, if chest pain is enabled (selected Yes in the Patient Data Setup
screen) and ACI-TIPI is disabled, then the chest pain option will removed from
the Patient Data Setup menu. When a new patient is input, the chest pain
question is still asked.

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Pharma

High Security

System Test Function: Pharma

The MAC 1200 device variant is configured in the service mode and any MAC 1200
can be configured as a PHARMA device.The Pharma device variant is designed for
use by Clinical Research Organizations (CROs) in pharmaceutical trials. MAC 1200
units with the Pharma option are configured for specific pharmaceutical trials by
CROs and then sent out to trial sites to collect data.

The Pharma option of the MAC 1200 can be password-protected (HIGH
SECURITY). Password protection is enabled in the system setup.

NOTE

The Pharma and HIGH SECURITY options appear only if the device has been
configured as a Pharma device.

High Security provides the option of password-protecting use of the MAC 1200
unit. Any device configured with the Pharma option may enable the High Security
option.

 When the High Security option is enabled, users must provide information for

the Technician Name field.

 To bypass the logon password, press + + .

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For your notes

System Test Function: Pharma

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4 Repair Instructions

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For your notes

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Safety Instructions

When repairing the MAC 1200 resting ECG analysis system unit, the following
considerations apply:

 Repairs may only be conducted by approved service personnel.
 Before opening the MAC 1200 resting ECG analysis system, switch off

 Never connect the mains plug when the device is open.
 Before replacing the primary fuses in the power input module, the device

 For replacing components, only the original GE components, mentioned in the

 When replacing electronic components, implement ESD protection.
 Return replaced PCBs in ESD packaging only.
 Defective NC batteries or empty batteries should be disposed of in accordance

 Batteries returned to the factory should be labeled For disposal.

Repair Instructions: Safety Instructions

device and disconnect the mains plug.

should also be switched off and the mains plug disconnected.

spare parts list may be used.

with the applicable legal stipulations or returned to the factory.

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Repair Instructions: Replacing Components

Replacing Components

For all the following points, the “Safety Instructions” on page 4-3 need to be
observed.

WARNING

The device has to be switched off.

Opening the Device

To open the device, follow this sequence.

1. Release the five fastening screws on the underside of the device.

2. Open the paper feed flap.

3. Carefully raise the upper shell of the housing.

4. Disconnect the keypad cable by opening the connector KEYB/ on the PCB
Control.

The display remains in the lower shell of the casing.
During reassembly, ensure that no cables are pinched.

Replacing the Primary Fuses in the Mains Input Module

WARNING

Only use fuses indicated on the rating label. (See Chapter 8, “Parts

List” for details.)

1. Switch off unit and disconnect mains plug.

2. Insert small flat blade screwdriver sideways into the lower section of the power
connector.

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Repair Instructions: Replacing Components

3. Pull forward on lower part of connector port and small plastic tray will pop out
with fuses.

4. Remove fuses.

5. Align and insert new fuses in plastic fuse tray.

6. Position plastic fuse tray and snap back into position.

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Replacing the Keypad

Repair Instructions: Replacing Components

1. Open the device as described in “Opening the Device” on page 4-4.

2. Replace with new Keypad FRU Assembly by connecting keypad connector in
front of unit.

3. Place the plastic spacer tubes back in the handle.

4. Align upper shell to lower unit.

5. Insert and fasten 5 screws to lower unit

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Replacing the Battery

Repair Instructions: Replacing Components

1. Disconnect and lift out the battery compartment on the underside of the device
by raising the middle fastening catch.

2. Remove the battery and disconnect the battery plug BATT_IN/ from the PCB
Battery Charge.

WARNING

Only original GE-supplied batteries may be used. (See Chapter 8,

“Parts List” for details.)

Defective NC-batteries or empty batteries should be disposed of in accordance
with the applicable legal stipulations or returned to the factory.

Batteries returned to the factory should be labeled For disposal.

3. Before putting in the new battery, insert plug BATT_IN/. Push in battery
compartment, secure by pressing on the fastening catch.

Replacing the PCB Battery Charge

1. Open the device.

2. Open the battery compartment and disconnect the battery connector BATT_IN/
. (See

3. Disconnect the connector BATT/ from the PCB Control.

4. Undo the fastening screw next to the inductor L1 on PCB Battery Charge. The
PCB Battery Charge has one soldered fuse: SI 1: Battery fuse.

5. No adjustments on the PCB Battery Charge are necessary.

“Replacing the Battery” on page 4-7 for details.)

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Replacing the PCB Control

Repair Instructions: Replacing Components

Before replacing the PCB, if still possible, print out the settings configured by the
user and check the options enabled.

1. Open the device.

2. Disconnect the plug-in connector POSUP/ to the power supply unit, and the
connector BATT_IN/ from the PCB battery charge.

3. While the connectors are disconnected, ensure that the connector BATT_IN/
makes no contact with the coated shell

4. Disconnect the remaining connectors to the recording unit. Undo the 6 PCBs
fastening screws.

5. Check whether the connection LOET2 of the lithium battery for the real-time
clock (BA1) is correctly soldered.

6. Also check whether the connection LOET1 of the backlight inverter is soldered
correctly.

7. Insert new PCB, fix the fastening screws and plug in connectors.

8. Connect keypad in the upper shell to connector KEYB/

Replacing the Motor

9. Close connector on PCB control.

10. Set the upper shell on to the lower shell. Tighten the 5 fastening screws.

11. Contact your local service representative to download the software.

12. Enter the device serial number.

13. If required, enter the option codes as described in the operator's manual.

14. Adjust the display contrast.

15. Set the time and date. For setting the date and time, see Chapter 3, “Time and

Date” section for details.

16. If known, adopt the user-programmed configuration; otherwise, default setting.

After the motor is replaced, there is no need to adust the speed. Nevertheless, it is
advised that you run the motor test. (See
details.)

Chapter 3, “Motor Test” section for

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Repair Instructions: Replacing Components

Replacing the Graphics Display

Follow these instructions to replace the graphics display:

1. Open the device.

2. Open connector HOS/ and release the flat ribbon cable of the display.

3. Undo the screws of both plastic display holders.

4. Shift the display 2 mm in the direction to the handle and lift up display and
holders.

5. Disconnect the plug HOS_BL/.

To reassemble, reverse these instructions.
Adjust the contrast with the new display.

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For your notes

Repair Instructions: Replacing Components

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5 Troubleshooting

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For your notes

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Troubleshooting: Basic Information

Basic Information

Repairs may only be conducted by approved service personnel.
For all the following points, see Chapter 4, “Safety Instructions” section for items

that need to be observed.

NOTE

The master password used to override all other passwords is SYSTEM.

Device cannot be switched on even though power plug is plugged in

 The green power lamp LED is off and device cannot be switched on.

 Is the power cable defective or not plugged in correctly?
 Are the primary fuses in the mains input module defective?
 Is the connector from the mains input module to the mains switching power

supply plugged in correctly or cable defective?

 Is the connector from the mains switching power supply to connector

POSUP/ on the PCB Control plugged in correctly or cable defective?

 Is the keypad via connector KEYB/ on PCB Control plugged in correctly?
 It there a 26.5 V on the connector POSUP/?

If no: mains switching power supply defective.
If yes: PCB control defective or keypad defective.

 The green power lamp LED is on, but device still cannot be switched on.

 Is the PCB control defective?
 Is the keypad defective?

Device cannot be switched on when running on battery power

 Is the battery depleted?

 Plug in power plug. The green power lamp LED should glow and the

device can be activated.
If not: refer to “Device cannot be switched on even though power plug is

plugged in” on page 5-3.

 By connecting the power plug, rapid charging is activated (as indicated

with LED1 on the PCB battery charge).
If not: PCB battery charge is defective.

 With power plug plugged in, let the unit charge for 10 minutes, then

disconnect power plug. Can the device be switched on and can a recording
be started?

If yes: Function OK. Continue loading with plugged mains plug.
If not: Is the battery disconnected or cable defective?

Is the battery defective (no capacity)?

 Is the PCB battery charge defective?

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Error In Self-Test Identified

Troubleshooting: Basic Information

No Display On the Screen

 Does the yellow Stop LED on the keypad glow after the device is switched on?

If not: Refer to “Device cannot be switched on ....”

If yes: Continue

 Does a beep sound approximately 10 seconds after switching on the MAC1200

occur (indicates the successful power up self-test)?
If not: Self test error, PCB Control defective

If yes: Continue

 Contrast badly adjusted?
 Can the background illumination be activated by pressing a key?
 Can the display test in Chapter 3, “Display Test” be applied successfully?

If not: Graphics display module defective or PCB Control defective

When an error is detected during the self-test, in addition to the message Self-test
failed, the error code number and a short description also appear on the display. The
meaning of the error codes are described in
refer to the PCB Control, and should be noted as information for the service center.

Chapter 3, “Self-Test”. The error codes

MAC 1200 Fails to Give Printout, No Paper Transport

Perform the following test in the 6-lead operating mode.

 Is paper available? Is paper correctly inserted? Are there paper transport

problems (jam)?

 Is the paper feed flap correctly engaged on both sides?
 After pressing the start key, the green start LED must glow.

If not: Is the keypad defective? Apply keypad test in Chapter 3, “Keyboard

Test” section.

If yes: Continue.

 Is the mark reader defective or not plugged in?
 Are all connections for the printhead and motor plugged in?
 Is the motor blocked? (check roller, transmission)
 Is the unit operating only on battery which is strongly depleted?

If yes: Plug in power plug.
If not: PCB control defective.

Paper Transport Functions, No Printout

 Is the paper feed flap correctly engaged on both sides?
 Are all connectors for printhead plugged in?
 Is the unit operating with a strongly depleted battery?

If yes: Plug in power plug.
If no: The PCB Control defective or printhead defective.

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Troubleshooting: Basic Information

MAC 1200 Only Prints on the Upper or Lower Section of the Printout

 Is the paper feed flap is only engaged on one side?

MAC 1200 Prints, but only Baselines are Printed Out

 Are the electrodes applied correctly?
 Are electrode cables plugged into the patient trunk cable terminal-box

correctly?

 Is the patient trunk cable defective (e.g., RL defective)?
 Are there contact problems at the patient input connector of the MAC1200?

If not: T he PCB control defective.

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For your notes

Troubleshooting: Basic Information

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6 Adjustment Instructions

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Basic Information

Adjustment Instructions: Basic Information

For the MAC 1200 resting ECG analysis system, no adjustment of components is
required.

When PCB Control CS_CI, or the graphics display has been exchanged, the display
contrast should be adjusted to an optimum contrast ratio as described in the user
manual.

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For your notes

Adjustment Instructions: Basic Information

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7 Service and

Maintenance

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Service and Maintenance: Technical Inspections/Preventative Maintenance

Technical Inspections/Preventative Maintenance

It is recommended that a technical inspection/preventative maintenance check is
performed once a year. The following checks/tests are to be performed.

 Check device and accessories for mechanical defects which impair their

function.

 Perform a function check as detailed in Chapter 3, “System Test Function”.
 Ensure that labels and inscriptions on the device relating to safety are clearly

legible.

 Measure the Protective Earth Resistance (see “Protective Earth Resistance

Test” on page 7-8).

 Measure the enclosure leakage current (see “Enclosure Leakage Current Test”

on page 7-9).

 Measure the patient leakage current (see “Patient Leakage Current Test” on

page 7-9).

WARNING

The following checks may only be performed by persons whose
training, knowledge and practical experience enable them to carry
out such checks reliably and correctly.

The operational and functional reliability of the device is checked using the
information in this chapter, which serves the experienced technician when checking
the device.

A knowledge of device operation as detailed in the “Operator's Manual” is assumed.
The checks and tests are based on the testing instruments given in this section.
The tests should be carried out using the customer's accessories, so that defective

accessories are also detected automatically. If other testing instruments are used
besides those mentioned, the items on the checklist and tolerance specifications may
need to be modified.

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Service and Maintenance: Technical Inspections/Preventative Maintenance

Visual Check

Device and accessories should be checked for the following:

 Fuse cartridges comply with vendor's specifications.
 Labels and inscriptions on the device relating to safety are clearly legible.
 The mechanical state of the device permits its further use.
 There is no product deterioration (dirtiness, dents, rough edges, etc) which

could cause any reduction in safety.

Test Functions

Recommended Testing Instruments and Accessories

1x Multi-parameter simulator Lionheart
1x RS232 interface connector with internal connection between pins 2 and 3

(TXD and RXD)

1x Patient trunk cable and customer electrode leads, or 1X patient trunk cable, 10-

pin 223 387 01

Test Preparations

In general, the device test functions implemented in MAC 1200 resting ECG
analysis system are used for the tests. See
details.

Connect MAC 1200 resting ECG analysis system up to the mains, the green LED
for standby must glow.

Switch the device on, the self-test runs automatically, no error message should
appear. When the self-test has finished, the device is in the automatic mode, the
yellow LED (indicating disabled operating mode) should still be glowing.

Modifications in the user-programmed configurati on may need to be made in order
to carry out the test. If such a change needs to be made to enable testing, make a
printout of all the modified configuration lists and mark the changes made.

NOTE

After completing the test the original user-programmed configuration is to be
retrieved and activated.

Operating and Display Unit Performance Tests

 Carry out the “Display Test” as detailed in Chapter 3, “Display Test”.
 Carry out the “Keyboard Test” as detailed in Chapter 3, “Keyboard Test”.

Chapter 3, “System Test Function” for

Test for Recording Speeds 25 and 50 mm/s

 Carry out the “Motor Test” as detailed in Chapter 3, “Motor Test”.
 The feed speed deviations should be less than 3%.

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Service and Maintenance: Technical Inspections/Preventative Maintenance

Device Test Result Check

RS-232 Interface Test

 Output “Test Results” as detailed in Chapter 3, “Test Results”.
 Main parameters:

 All memory stores free from error?
 ASIC test O.K?
 Sample rate 1000?
 Printhead voltage >18 V, battery charge O.K?
 Printout clearly legible and without any lapses or interference?

Carry out the “Interface Test” item “(1) Transmitting and receiving”, as detailed in
Chapter 3, “V24 Tests”.

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Service and Maintenance: Technical Inspections/Preventative Maintenance

Analysis of the ECG Signals and HR Value

Carry out the following settings on the ECG simulator.

 Amplitude: 1 mV
 Heart rate (RATE): 60 bpm

Connect the electrode leads as indicated below.

R, red (or RA) -----> RA
L, yellow (or LA) -----> LA
F, green (or LL) -----> LL
N, black (or RL) -----> RL
C1, white/red (or V1) -----> V1

:
:

C6, white/violet (or V6) -----> V6

Switch in 6 lead operating mode and start recording by pressing the Start key.
By pressing the lead scrolling key, check whether all leads are being recorded.
The ECG traces must be noise-free.
Record one page in the manual (6-lead) operating mode. The following annotations

must be present.

 Heart rate (top right)
 Lower status line

 Date and time
 Recording speed
 Sensitivity
 Active filter, e.g., 50/60 Hz, 40/20 Hz, ADS
 Frequency range of the recording

The heart rate of 60 bpm ±2 bpm appears on the display and is printed out on the
recording.

Activate the square-wave function on the ECG simulator at 1 mV.Using the lead
scrolling key select lead II. The square-wave pulse trace must correspond in
amplitude with the displayed 1 mV reference pulse (applicable to named simulator
only).

Switch back to ECG signal on the ECG simulator. Start the recording in manual (6­lead) mode. Increase the heart rate to 200 bpm on the ECG simulator. The acoustic
warning signal must sound for about 1s. Reduce the heart rate back to 60 bpm, the
warning signal no longer sounds.

Pacemaker Identification Test

Make the following settings on the multifunction simulator.

 Pace setting
 Pace amplitude 6 mV
 Pace duration 0.2 ms

Adjust manual (6-lead) mode on MAC 1200 device to be tested and select lead
groups I, II and III.

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Service and Maintenance: Technical Inspections/Preventative Maintenance

Start the recording. The pace pulses must be visible as spikes on the recording
output.

Identification of Disconnected Electrodes

Reset the simulator to ECG signal at a heart rate of 60 bpm. Remove one electrode
after the other from the ECG simulator.

Activate the Automatic (12-lead) mode in the MAC 1200 resting ECG analysis
system device to be tested without activating it by pressing the Start key.

Ensure that each disconnected electrode is displayed correctly and that an acoustic
alarm signal sounds.

Checking the Charge Status of the NC Battery

The NC battery can be checked as follows.

 Discharging the battery , followed by charging up completely (duration 4 hours),

followed by discharging in standby mode without recording.

If the operating time for this procedure is under 2.5 hours, the battery should be
replaced.

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Service and Maintenance: Technical Inspections/Preventative Maintenance

020A

MV

0.015 F

10 k

1 k

Measuring

Device

(R

1

>1 M)

Safety Analysis Tests

General Information

The suggested safety analysis tests refer to the international standard IEC 601-1.
The tests are generally performed with safety testers, the measuring circuits of most

of which are calibrated according to IEC 601.
The following is a general description of the tests to be performed. for the handling

of your Safety Tester follow the user manual.
The tests may be performed under normal ambient conditions of temperature,

humidity and pressure and with line voltage.
The leakage currents correspond to 110% of rated voltage for the tested unit. Most

safety testers take this into account, otherwise the measured values have to be
calculated.

Recommended Test Equipment

 Safety tester for measurements according to IEC 601.
 Testing connector according to the following description.

Protective Earth Resistance Test

The power cord is to be included in the protective earth resistance test.
This test determines whether the device has a power ground fault.

 The protective earth resistance from power connector to any protective earth

connected exposed conductive part is measured.

 Specification of test circuit: AC current source 50 Hz/60 Hz of at least 10 A up

to 25 A with limited output voltage of 6 V.

 If resistance is greater than 100 mOhm, the unit fails this test.

Measurement of Leakage Current

To perform the suggested measurements, the unit being tested has to be separated
from any interconnection to a system. If the unit is part of a system, extended tests
according to IEC 601-1-1 have to be performed. The diagram on the following page
shows the Measuring Circuit [M] required for leakage current. The reading in mV

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corresponds to mA (leakage current). The safety testers generally work with this
Measuring Circuit [M] and the displayed values are already converted to leakage
current.

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Service and Maintenance: Technical Inspections/Preventative Maintenance

021A

Safety Tester

[M]

GND

Power Cord

Probe to
Exposed

Chassis

NORM/RVS

High

GND

Low

Unit Under Test

Power Cord

Enclosure Leakage Current Test

This test is performed to measure leakage current from chassis to ground during
normal condition (N.C.) and single fault conditions (S.F.C.).

In all cases, the leakage current is measured from any exposed conductive parts to
ground, the unit being tested has to be switched on and off.

Connect the unit being tested to your safety tester.

 During normal condition (N.C.), measurements have to be done under the

following conditions (refer to the electrical diagram):

 Polarity switch Norm and RVS
 GND switch GND closed
 S1 closed and open

 During single fault conditions (S.F.C.), measurements have to be done under the

following conditions (refer to the electrical diagram).

 Polarity switch NORM and RVS
 GND switch GND open
 S1 closed

The test has failed if the measured values are greater than the following:

N.C. S.F.C

100 µA 500 µA 

300 µA (UL requirements)

Electrical Diagram for Enclosure Leakage Current Test

Patient Leakage Current Test

This test performs a leakage current test under single fault conditions (S.F.C.)
depending on domestic power outlet of 115 or 230 V AC as source into the floating
inputs.

In all cases, the leakage current is measured from input jack of the unit being tested
to ground.

Connect the unit being tested to your Safety Tester.

 Referring to the electrical diagram, the measurements have to be done under the

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following conditions.

 Polarity switch NORM and RVS
 GND switch GND closed
 S1 closed

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Service and Maintenance: Technical Inspections/Preventative Maintenance

022A

Safety Tester

[M]

GND

Power Cord

Patient

Cable or

Test Plug

NORM

High

GND

Low

Unit Under Test

Power Cord

R

RVS

Test has failed if the measured values are greater than 50 µA.

Electrical Diagram for Patient Leakage Current Test

For the protection of the test person, the following values of resistor R may be used.
Type BF 22 kOhm (120 to 130 V)

47 kOhm (220 to 240 V)

Type CF 100 kOhm (220 to 240 V)

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Service and Maintenance: Maintenance, Cleaning, and Disinfection

Maintenance, Cleaning, and Disinfection

MAC 1200 resting ECG analysis system maintenance, cleaning, disinfection is
performed in accordance with the “Cleaning, Disinfection and Maintenance”
chapter of the operator manual for the MAC 1200 resting ECG analysis system.

Applications requiring extensive recordings may result in deposits on the thermal
array printhead, which normally do not have any adverse effect on the printing
quality. This can be removed with a soft, lint-free cloth soaked in an alcohol-based
cleaning agent (e.g., surgical spirit).

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For your notes

Service and Maintenance: Maintenance, Cleaning, and Disinfection

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