GE Healthcare MAC 1200 ST, MAC 1200 Service Manual
GE Healthcare
MAC™ 1200/MAC™ 1200 ST
Resting ECG Analysis System
(2018357-003 & 2013503-003 PWAs)
Service Manual
2012250-095 Revision A
g
NOTE: The information in this manual only applies to MAC™ 1200 resting ECG analysis system with the
2018357-003 or 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.
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.
MAC® and MUSE® owned by GE Medical Systems Information Technologies, a General Electric company, going to market
as GE Healthcare. All other marks are owned by their respective owners.
© 2007 General Electric Company. All rights reserved.
T-2 MAC™ 1200 resting ECG analysis system Revision A
2012250-095 22 May 2007
CE Marking Information
CE Marking Information
Compliance
The MAC™ 1200 resting ECG analysis system bears CE mark CE-0459
indicating its conformity with the provisions of the Council Directive 93/
42/EEC concerning medical devices and fulfills the essential
requirements of Annex I of this directive. The product is in radiointerference protection class A in accordance with EN 55011.
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.
Exceptions
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 A MAC™ 1200 resting ECG analysis system CE-1
2012250-095
For your notes
CE Marking Information
CE-2 MAC™ 1200 resting ECG analysis system Revision A
2012250-095
Contents
1 The Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Manual Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Illustrations and Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Basic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Variants of the MAC™ 1200 resting ECG analysis system . . . . . . . . . . . . . . . . . .1-6
Hardware Functional Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
Block Circuit Diagram of Entire Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Mechanical Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
2 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Basic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Switching Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
PCB NC Battery Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Charging Circuit for the NC Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
Battery-Dependent Device Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
PCB Control CS_CI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Generation of Internal Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
Switch On/Off Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8
ECG Recording and Front-End Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
Controller Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10
Real Time Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12
LCD Graphics Display Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12
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Modem Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Internal Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
Mechanical Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-18
Electronic Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-18
Interfaces to Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
Electronic Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-24
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
3 System Test Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Test Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Display Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Contrast Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Keyboard Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Motor Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9
Recording Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
V24 Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Sending and Receiving (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11
Send Test String to Device (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11
Send and Receive with Device (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12
Time and Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Electrode Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Time Constant/Baseline Roll Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Setting the Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Interpretation (International Device Models Only) . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Pace Enhance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
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Ergometer / Treadmills (JAPAN Device Model Only) . . . . . . . . . . . . . . . . . . . . . . 3-21
ACI-TIPI (US Device Models Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Pharma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
High Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23
4 Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Replacing Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Opening the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Basic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
6 Adjustment Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Basic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
7 Service and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Technical Inspections/Preventative Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Visual Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-4
Test Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-4
Safety Analysis Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-8
Maintenance, Cleaning, and Disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11
8 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Field Replaceable Units (FRUs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
High Level Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-4
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9 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
Basic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-3
Printer Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-3
Paper Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-4
Membrane Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-4
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-4
Indicators (LEDs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-4
Automatic Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-4
Detection of Pacer Pulses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-5
Heart Rate Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-5
Signal Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-5
Data Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-6
Pin Assignment of Data Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-6
Remote Start (Hardware) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-6
Signal Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-7
ECG Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-8
Automatic ECG Gain Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-8
Baseline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-8
Anti-Drift System (ADS) (Cubic Spline) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-8
ECG Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-8
Blocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-9
Electrode Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-9
Text Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-9
Copy Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-9
Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-9
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-9
Mains Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-10
Battery Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-10
Operational Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-10
Operating Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-10
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-11
Recorder Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-11
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-11
10 Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Basic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
High Level Assembly, PN 101 168 01...38, Sheet 1 . . . . . . . . . . . . . . . . . . . . . . . 10-3
High Level Assembly, PN 101 168 01...38, Sheet 2 . . . . . . . . . . . . . . . . . . . . . . . 10-4
PCB Assembly Drawing, PN 2033914-027 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-5
Schematic, PN 2033914-033, Sheet 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6
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Schematic, PN 2033914-033, Sheet 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7
Schematic, PN 2033914-033, Sheet 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
Schematic, PN 2033914-033, Sheet 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
Schematic, PN 2033914-033, Sheet 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
Schematic, PN 2033914-033, Sheet 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
Schematic, PN 2033914-033, Sheet 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12
Schematic, PN 2033914-033, Sheet 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
Schematic, PN 2033914-033, Sheet 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14
Schematic, PN 2033914-033, Sheet 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
Schematic, PN 2033914-033, Sheet 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16
Schematic, PN 2033914-033, Sheet 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17
Schematic, PN 2033914-033, Sheet 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
Schematic, PN 2033914-033, Sheet 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
Schematic, PN 2033914-033, Sheet 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
Schematic, PN 2033914-033, Sheet 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-21
Schematic, PN 2033914-033, Sheet 17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-22
Schematic, PN 2033914-033, Sheet 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-23
Schematic, PN 2033914-033, Sheet 19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
Schematic, PN 2033914-033, Sheet 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-25
PCB Battery Charge CS_CSI, PN 388 032 90, Sheet 1 . . . . . . . . . . . . . . . . . . . . 10-26
PCB Battery Charge CS_CSI, PN 388 032 90, Sheet 2 . . . . . . . . . . . . . . . . . . . . 10-27
Revision A MAC™ 1200 resting ECG analysis system v
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For your notes
vi MAC™ 1200 resting ECG analysis system Revision A
2012250-095
1 The Basics
Revision A MAC™ 1200 resting ECG analysis system 1-1
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For your notes
1-2 MAC™ 1200 resting ECG analysis system Revision A
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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
The Basics: About This Manual
Definitions
This manual is intended for the person who uses, maintains, or
troubleshoots this equipment.
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.
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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
Block Circuit Diagram of Entire Instrument
MAC 1200 (US), Version 6.2
ECG
Input
Program
Memory
Boot Loader
Configuration
Memory
ECG
Acquisition
and
Conditioning
Logic Supply
+5 V +3.3 V
Analog
Supply
Printhead
Supply
Internal
RAM
Device
On/Off
Control
ECG RAM
Buffered
Controller
Core
Real Time
Clock
Buffered
Modem Supply
RS232
Driver
Keypad
Interface
Display
Interface
Display
Supply
Motor
Control
Thermal
Pinhead
Control
Pump Interface
(not in US
Device)
PCB Control SC_CI
RS232
Interface
Keypad
LCD Graphics Display
1/4 VGA Monochrome
Motor
Thermal Printhead
Printing Unit
Option Pump
(Not in US Device)
Line
Power
Input
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Line Power
Input with
Fuse
Switching
Power
Supply
+26.5 V
Line Power, NC Battery
NC Battery
PCB NC
Battery
Charge
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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 (12-lead) mode.
The PCB NC battery charge controls and monitors the charging process,
depending 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 batterycharging 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 monitoring 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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