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Obstetrical Care
SERVICE GUIDE
Avalon CTS
Cordless Fetal Transducer System
M2720A
FETAL MONITORING
Printed in Germany 10/04
*M2720-9000C*
Part Number M2720-9000C
4512 610 04681
S
Avalon CTS
Cordless Fetal Transducer System
M2720A
SERVICE GUIDE
M2720-9000C
October 2004
Printed in Germany
ii
Contents
1 General Information 1
Who Should Read This Guide 1
What to Do Next 1
Repair Strategy 2
Pre-Installation Considerations 2
When is the Avalon CTS Customer Installable? 2
When are Special Configurations Needed? 3
Warnings, Cautions and Important Information 3
Symbols on the System 3
Patient Safety 4
Protective Earth 5
Environment 5
General Description 5
Mounting Solutions 6
Applying the Velcro Fixing Tape 7
Antenna Extension Mounting Kit 8
Mounting on Philips Carts 8
Mounting on Wooden Carts and Other Flat Surfaces 9
Considerations for Choice of Configuration 9
Frequency Bands 9
Standard Delivery Configuration 10
When is a Different Configuration Needed? 10
When the Area of Reach is Not Sufficient 10
When the Standard Configuration is Unsuitable 10
Japanese Systems 10
Multi-Region Base Station 11
Frequency Planning 11
Setting Expectations 11
Antenna System Guidelines 12
Before You Install an Antenna System 12
Specifications 13
Mixed Telemetry Devices on the Same M2600A Antenna System 13
2 Theory of Operation 15
Receiver Board 16
Human Interface Board 16
Power Supply 16
Slot Control and Monitor Interface Board Hardware 16
Transducer Hardware Overview 17
Functional Description of the RF/CPU Hardware 17
Base Station Communication 18
Power Supply and Battery Charger 18
Modulator 18
RF Transmitter 18
Toco Frontend Hardware 18
Ultrasound Frontend Hardware 18
ECG Frontend Hardware 18
3 System Interfaces 21
Fetal Monitor Interface 21
Service Interface 22
Compatible Fetal Monitors 23
4 Disassembly/Reassembly 25
Introduction 25
Removing the Top Cover Assembly 26
Replacing the Top Cover Assembly 27
Changing Fuses 28
Changing the Power Supply/Metal Chassis Assembly 31
5 Spare Parts 39
Exchange Parts 39
Non-Exchange Parts 40
Supplies and Accessories 40
Antenna and Base Station Part Numbers 41
6 Preventive Maintenance and Safety 43
Care and Cleaning 43
Recommended Frequency of Testing 43
Performance Assurance Tests 44
Self Test 44
Parameter Test 44
Testing Alarms 45
Safety Tests 45
Safety Test Procedures 46
When to Perform Safety Tests 46
How to Carry Out the Test Blocks 47
Description of Applicable Safety Tests 48
S(1): Protective Earth Test 48
S(2): Enclosure Leakage Current Test
- Normal Condition (NC) 48
S(3): Enclosure Leakage Current Test
- Single Fault Condition (SFC) Open Supply 49
S(4): Enclosure Leakage Current
- SFC Open Earth (Ground) 49
Instrument Safety Test 50
System Test 50
What is a Medical Electrical System? 50
General Requirements for a System 50
System Example 51
Regular Preventive Maintenance 51
Mechanical Inspection 51
Visual Check 52
Toco Ventilation/Belt Button 52
Testing the Ventilation Membrane 52
Battery Check 53
Starting the Battery Check 53
Stopping the Battery Test 54
Stages of the Battery Check 54
Reading Battery Check Data Using the Service Support Tool 55
Battery Exchange 55
7 Troubleshooting 57
System is Completely Inoperative 57
System Reset 57
Common Problems 58
Troubleshooting a Cordless System: an Overview 59
Checking Contacts 60
Checking the Fetal Monitor 60
RF Problems 60
Carrier to Noise Ratio 60
Gathering Data 61
Observe System Performance 61
Question the User 61
Area of Reach 62
Range Definition 62
Using the Base Station 62
Using the Service Support Tool 63
RF Interference 63
One-Channel or Narrowband Interference 63
Broadband Interference 64
Guidelines for Channel/Frequency Configuration 64
Scanning the Available Frequency Range 64
Excluding Frequencies 65
Base Station with Fixed Frequency 65
Transducers with Fixed Frequency 66
Transducers for Japan 66
Multi-Region Base Station 66
Delivery Status 66
Installation 66
Testing Transducers 67
Ultrasound Transducer Electrical Check 67
TOCO Transducer Electrical Check 68
ECG Transducer Electrical Check 69
In DECG Mode 69
In MECG Mode 70
Troubleshooting the Top Cover 71
Function Buttons 71
Display/Window 72
LEDs 72
Magnets 72
Factory Information Code Log 72
8 Changing Settings 73
Configuration Settings 73
Function Settings 74
Bed Label Appearance 74
Enabling/Disabling Fixed Frequency 74
Selecting the Channel Frequency Spacing 75
Action Settings 77
Displaying the Software Revision 77
Clearing the Factory Information Code (FIC) Log 77
Starting the Battery Check 78
9 Upgrades 79
10 Specifications 81
General 81
Base Station 81
Transducers 82
Frequency Bands 83
Frontends 83
Cables 84
Electromagnetic Compatibility (EMC) Specifications 85
Emissions and Immunity 85
Electromagnetic Immunity 85
Finding Recommended Separation Distances 86
Recommended Separation Distances from Portable and Mobile RF Communication
Equipment 88
A Removing and Replacing the Transducer Battery 89
B Removing and Replacing the Transducer Belt Button 91
C Avalon CTS Frequency Table 93
1
1General Information
This guide tells you how to service and repair the base station (M2720A) and transducers (M2725A,
M2726A, and M2727A) of the Avalon CTS Cordless Fetal Transducer System. It describes the system
hardware and software, tells you how to diagnose operating and servicing problems, and how to test the
system.
As this system is intended to be installed by the customer, refer to the Instructions for Use for details of how to
install the system. See also "Pre-Installation Considerations" on page 2.
The Avalon CTS Cordless Fetal Monitoring System Service Guide supplements the maintenance and
troubleshooting procedures, carried out by the operator, that are described in the Instructions for Use. Refer to
the Instructions for Use for maintenance and troubleshooting procedures that may be performed during
normal operation.
Only qualified service personnel should attempt to install the system, disassemble the base station, remove or
replace any internal assemblies, or replace the transducer batteries or belt buttons.
Who Should Read This Guide
This guide is for any qualified technical personnel servicing and repairing the Avalon CTS Cordless Fetal
Transducer System.
You must: