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TABLE OF CONTENTS
Models 78670A/78671A
78670-1
TABLE OF CONTENTS
1 GENERAL
1.1 INTRODUCTION 1-1
1.2 IDENTIFICATION 1-1
1.3 INQUIRES 1-1
1.4 DESCRIPTION 1-2
1.4.1 General 1-2
1.4.2 Model 78670A Defibrillator/Monitor with Annotating Recorder . . 1-3
1.4.3 Model 78671A Defibrillator/Monitor/Recorder 1-4
1.4.4 Monitor 1-4
1.4.5 Recorder 1-4
1.4.6 Defibrillator Output Information 1-5
1.4.7 Self Diagnostics 1-5
1.4.8 Defibrillator Charge Time 1-6
1.4.9 Paddles 1-6
1.5 MODEL 78670A/78671A OPERATING CONTROLS 1-7
1.6 OPTIONS 1-13
1.7 GENERAL INSTALLATION INFORMATION 1-13
1.7.1 Initial Inspection 1-13
1.7.2 Claims and Repackaging 1-13
1.8 PREPARING FOR OPERATION 1-14
1.9 ENVIRONMENT 1-14
1.9.1 Operating Environment 1-14
1.9.2 Storage and Shipment Environment 1-14
1.10 POWER REQUIREMENTS (MODEL 78668A POWER BASE) 1-15
1.11 INSTRUMENT GROUNDING AND POWER CORD SETS (78668A POWER BASE) . . . 1-15
1.12 MOUNTING (78668A POWER BASE) 1-15
1.13 OPTIONAL ACCESSORY CABLES 1-17
2 THEORY OF OPERATION
2.1 INTRODUCTION 2-1
2.2 SYSTEM OVERVIEW 2-1
2.2.1 ECG Switch Board and Analog Board 2-1
2.2.2 Digital ECG Circuits 2-2
2.2.3 CRT Timing Circuit and Memory 2-2
2.2.4 CRT Driver Circuit 2-2
2.2.5 Heart Rate Circuit 2-2
2.2.6 Real Time Clock 2-2
2.2.7 Recorder Circuit 2-2
2.2.8 Defibrillator Control 2-3
2.2.9 Defibrillator H.V. Circuits 2-3
2.2.10 Low Voltage and CRT Power Supply 2-4
2.2.11 Battery and Battery Relay 2-4
2.2.12 Quick-Mount Power Base 78668A 2-4
2.2.13 Spare Battery Charger 78669A 2-4
2.3 DETAILED THEORY OF OPERATION 2-7
2.3.1 ECG Switch Board 78670-60215 2-7
2.3.1.1 ECG Source Switch 2-7
2.3.1.2 Protective Circuitry 2-7
2.3.2 ECG Analog Board 78670-60155 2-7
2.3.2.1 Protection Circuitry 2-7
2.3.2.2 Differential Amplifier 2-8
2.3.2.3 Right Leg Drive (RLD) 2-8
TABLE OF CONTENTS
Models 78670A/78671A
78670-1
2.3.2.4 ECG Leads Off Indicator 2-9
2.3.2.5 Chopper Modem and Power Supply 2-10
2.3.2.6 EMI Rejection 2-10
2.3.2.7 Chopper Driver 2-11
2.3.2.8 Baseline Restore 2-11
2.3.2.9 Fixed Gain Stage 2-12
2.3.2.10 Zero Offset Potentiometer 2-12
2.3.2.11 Calibration Potentiometer 2-12
2.3.2.12 Analog Power Supply 2-12
2.3.2.13 Electromagnetic Interference Rejection 2-12
2.3.2.14 Paddle Contact (PC) 2-13
2.3.3 ECG Digital Circuit Board 2-14
2.3.3.1 50/60 Hz Notch Filter 2-14
2.3.3.2 Auto Gain Attenuator 2-14
2.3.3.3 Manual Variable Gain 2-14
2.3.3.4 Voltage to Frequency Converter (V/F) 2-15
2.3.3.5 Auto Bias 2-15
2.3.3.6 Microprocessor 2-15
2.3.4 Microprocessor Reset "Tickle" Circuit 2-16
2.3.4.1 Beeper 2-17
2.3.4.2 Electromagnetic Interference Rejection 2-17
2.3.5 Memory/Display Board 78660-60170 2-17
2.3.5.1 Functional Overview 2-17
2.3.5.2 Oscillator and Johnson Counter 2-19
2.3.5.3 1025 Counter 2-19
2.3.5.4 Delay ECG Gate (1026 count) 2-19
2.3.5.5 Address Counter 2-20 -^
2.3.5.6 RAM Read-Write 2-20 ^
2.3.5.7 Bidirectional Data Bus 2-20
2.3.5.8 Digital to Analog Converter (D/A) 2-20
2.3.5.9 Sample and Hold 2-20
2.3.5.10 Ramp Generator 2-21
2.3.5.11 Analog Multiplexer (MUX) 2-22
2.3.6 Deflection Board 78660-60180 2-22
2.3.6.1 Vertical Amplifier 2-22
2.3.6.2 Horizontal Amplifier 2-23
2.3.6.3 Intensity Driver 2-23
2.3.7 Clock/Heart Rate Board 78660-60260 2-24
2.3.7.1 Heart Rate Circuit 2-24
2.3.7.2 Heart Rate Digital Display 2-24
2.3.7.3 Language Option Selector 2-24
2.3.7.4 Heart Rate Alarm Switch 2-24
2.3.7.5 Clock Circuit 2-25
2.3.7.6 Voltage Reference 2-27
2.3.7.7 Clock Battery 2-27
2.3.7.8 Clock Protection 2-27
2.3.7.9 Clock Crystal . . . 2-27
2.3.8 Recorder Control Board 78660-60200 2-27
2.3.8.1 ECG Monitor to Recorder Signal 2-27
2.3.8.2 ECG Memory to Recorder Signal 2-27
2.3.8.3 Recorder Movement and Stylus Heat Control 2-28
2.3.8.4 Recorder/Signal Control 2-28
2.3.8.5 ECG Signal Amplitude Limiting and Switching 2-28
2.3.8.6 Microprocessor Reset (Tickle) Circuit 2-29
2.3.8.7 Print Head Driver 2-30
TABLE OF CONTENTS
Models 78670A/78671A
78670-1
2.3.8.8 Print Head Protective Circuit 2-31
2.3.8.9 Input/Output Lines 2-31
2.3.9 Defibrillator Control Circuit Board 78670-60195 2-32
2.3.9.1 Microprocessor 2-32
2.3.9.2 "Ticke!" Reset Circuit 2-32
2.3.9.3 LCD Drivers and Recorder Data 2-33
2.3.9.4 Analog Multiplexer and A/D Converter 2-34
2.3.9.5 I/O Expander 2-34
2.3.9.6 Relay Drivers 2-34
2.3.9.7 Charge Done Tone 2-34
2.3.9.8 Battery LED Driver 2-34
2.3.9.9 Paddle Contact Chopper 2-35
2.3.9.10 Monitoring the HV Capacitor 2-37
2.3.9.11 Charge and Discharge Cycle 2-37
2.3.9.12 Cardioversion 2-38
2.3.9.13 Software Safety Features 2-38
2.3.10 Defibrillator High Voltage Section 2-38
2.3.10.1 General 2-38
2.3.10.2 Power Circuits 2-39
2.3.11 Pulse Width Modulator 2-39
2.3.11.1 PWM Shutdown 2-40
2.3.11.2 Soft Start 2-40
2.3.12 HV Defibrillator Inverter Circuit 2-40
2.3.12.1 HV Monitor Circuit 2-41
2.3.12.2 Patient Relay Circuit 2-42
2.3.12.3 Peak Current Detector Circuit 2-43
2.3.12.4 Safety Relay Circuit 2-44
2.3.12.5 5.4 V Reference/Low Battery Shutdown 2-44
2.3.13 Low Voltage Power Supply Board 78660-60110 2-46
2.3.13.1 Pulse Width Modulator (PWM) Internal Circuits .... 2-46
2.3.13.2 External PWM Circuits 2-48
2.3.13.3 5V. Supply Voltage Regulation 2-50
2.3.13.4 CRT Supplies (+5000 and +200 volts) 2-52
2.3.13.5 + and -15 Volt Supplies (Refer to Figure 2-62) .... 2-53
2.3.13.6 + and -12 Volt Supplies 2-53
2.3.13.7 Noise Filtering 2-53
2.3.14 Service Switch 2-53
2.3.15 Annotation Printout 2-54
CHECKS AND ADJUSTMENTS
3.1 INTRODUCTION 3-1
3.2 LEVEL II PERFORMANCE, SAFETY AND MAINTENANCE CHECKS 3-1
3.2.1 Test Equipment 3-1
3.2.2 Functional Performance Testing 3-4
3.2.2.1 Energy Accuracy 3-4
3.2.2.2 Self Testing Accuracy 3-5
3.2.2.3 Defibrillator Capacitor Charge Time 3-5
3.2.2.4 Synchronizer '. 3-5
3.2.2.5 ECG Amplifier Noise 3-6
3.2.2.6 ECG Amplifier Gain 3-6
3.2.2.7 Heart Rate Accuracy and Alarm 3-7
3.2.2.8 Paddle Contact Indicator (PCI) Test 3-8
3.2.3 Safety and Maintenance Checks 3-8
3.2.3.1 Preliminary Safety Checks 3-8
3.2.3.2 Power Cord to Chassis Ground Resistance Check 3-9
///
TABLE OF CONTENTS
Models 78670A/78671A
78670-1
3.2.3.3 Paddle Leakage Current (Source Leakage) to Ground. . . .3-11
3.2.3.4 Paddle Leakage Current (Sink Current) with 115 Volts App 3-12 /r^l
3.2.3.5 Patient Lead Leakage Current (Source Leakage) to Ground. 3-14
3.2.3.6 Leakage Current Between Patient Leads Check 3-15
3.2.3.7 Patient Lead Leakage Current (Sink Current) with 115 Vol 3-17
3.2.3.8 Battery Capacity Check 3-17
3.3 ADJUSTMENTS 3-18
3.3.1 Equipment Required 3-18
3.3.2 Related Adjustments 3-18
3.3.3 Adjustment Location 3-18
3.3.4 Paddle Contact Indicator Adjustment 3-20
3.3.5 Low Voltage Power Supply Adjustments 3-21
3.3.6 ECG Cal Adjustment 3-22
3.3.7 ECG Amplifier Baseline Offset Adjustment 3-24
3.3.8 CRT Display Adjustments 3-25
3.3.9 Real Time Clock/V REF ADJUSTMENT 3-26
3.3.10 Real Time Clock/Heart Rate Frequency Adjustment 3-27
3.3.11 Common Mode Rejection Notch Filter Switches 3-28
3.3.12 Voltage Reference, Defibrillator Charger Circuit Board . . . 3-29
3.3.13 Defibrillator Output Energy Calibration 3-30
3.3.14 High Voltage Charge Time Adjust 3-31
3.3.15 Self Test Accuracy Adjust 3-32
3.3.16 Recorder Pen Heat Adjust 3-33
3.3.17 Recorder Stylus Contact Pressure Adjustment 3-34
3.3.18 Recorder Pen Positioning 3-35
3.3.19 Recorder Print Head Adjustment 3-36
3.3.20 Setting Real Time Clock 3-37
3.4 SPECIFICATION CHECKS 3-39
3.4.1 ECG Amplifier/Heart Rate Section 3-39
3.4.1.1 Test Equipment 3-39
3.4.1.2 ECG Amplifier Gain - Manual Control 3-40
3.4.1.3 ECG Amplifier Gain - Auto Mode 3-41
3.4.1.4 Baseline Offset - ECG Lead Input 3-42
3.4.1.5 Baseline Offset - Paddles Input 3-42
3.4.1.6 ECG Amplifier Frequency Response, Leads Input 3-43
3.4.1.7 ECG Amplifier Frequency Response Check - Paddle Input . 3-43
3.4.1.8 Input Offset Tolerance (DC) - ECG Lead Input 3-44
3.4.1.9 Input Offset Tolerance (DC) - Paddle input 3-45
3.4.1.10 ECG Amplifier Noise, Leads Input 3-46
3.4.1.11 ECG Amplifier Noise, Paddles Input 3-47
3.4.1.12 ECG Calibration Check 3-48
3.4.1.13 Common Mode Rejection (CMR) Leads Source 3-49
3.4.1.14 Common Mode Rejection (CMR), Paddles Source 3-50
3.4.1.15 Heart Rate Accuracy 3-51
3.4.1.16 Heart Rate Alarm Limits 3-51
3.4.2 Recorder Section 3-52
3.4.2.1 Test Equipment Requirements 3-52
3.4.2.2 Recorder Frequency Response 3-53
3.4.2.3 Recorder Gain Accuracy, Linearity, and Overshoot . . . 3-53
3.4.2.4 Recorder Chart Speed 3-54
3.4.3 Defibrillator Section 3-54
3.4.3.1 Test Equipment 3-54
3.4.3.2 Energy Accuracy 3-55
3.4.3.3 Delivered Energy Waveform Information 3-56
iv
TABLE OF CONTENTS
Models 78670A/78671A
78670-1
3.4.3.4 Self Testing Accuracy 3-56
3.4.3.5 Defibrillator Capacitor Charge Time 3-57
3.4.4 Synchronizer Section 3.57
3.4.4.1 Test Equipment 3-57
3.4.4.2 R-wave/Sync Pulse/Discharge Delay 3-58
3.4.5 Paddle Contact Indicator 3-61
3.4.5.1 Test Equipment 3-61
3.4.5.2 Paddle Contact Indicator Test 3-61
MECHANICAL DISASSEMBLY/ASSEMBLY
4.0 PRELIMINARY INSTRUCTIONS 4-0
4.1 MECHANICAL DISASSEMBLY 4-1
4.2 MECHANICAL REASSEMBLY 4-2
4.2.1 Replacing the Low Voltage Power Supply Board 4-4
4.2.2 Paddle/Cable Assembly Replacement 4-5
4.2.3 Replacing the Defibrillator H.V. Board 4-8
4.2.4 Replacing H.V. Capacitor 4-9
4.2.5 Safety Relay Replacement 4-10
4.2.6 Patient Relay Replacement 4-11
4.2.7 Circuit Board Replacement 4_12
4.2.8 Recorder Board Assembly Replacement 4-12
4.2.9 ECG Analog Board Replacement 4-13
4.2.10 Switchboard Replacement 4-13
4.2.11 CRT Replacement 4-13
4.2.12 Front Panel Removal 4-14
4.2.13 Fuse Replacement 4-16
4.2.14 Knob Removal 4-16
4.2.15 ECG Size, Recorder, Alarm and ECG Source Knobs 4-16
4.2.16 Knob Replacement 4-17
4.2.17 Energy Selection Knob 4-17
4.2.18 Recorder Replacement 4-18
4.2.19 Printhead Replacement 4-20
4.2.20 Printhead Adjustment 4-21
4.2.21 Assembly Installation 4-22
4.2.22 QRS Beeper Speaker Replacement 4-22
4.2.23 "Paddles in Place" Reed Switch Replacement 4-23
4.2.24 ENERGY SELECTOR Switch Replacement 4-24
4.2.25 Other Components Mounted on the Flex Circuit 4.94
4.2.26 SYNC/DEFIB Switch Replacement 4.35
4.2.27 Flex Circuit Replacement ... 4_26
4.2.28 Liquid Crystal Display Replacement 4-26
4.2.29 LCD Replacement 4-28
4.2.30 LED Replacement, Front Panel 4_29
4.3 RECHARGEABLE NICKEL CADMIUM BATTERY - Bl 4.29
4.3.1 General Description 4_29
4.3.2 Charge Retention 4_29
4.3.3 Charging 4_30
4.3.4 Voltage Depression (Memory) 4_30
4.3.5 What To Do About It 4.30
4.3.6 Cell Reversal 4_3q
4.3.7 Battery Replacement 4_31
4.3.8 Storage of Nickel Cadmium Batteries a 01
4.4 RECORDER STYLUS REPLACEMENT J^f
TABLE OF CONTENTS
Models 78670A/78671A
78670-1
5 TROUBLESHOOTING
5.1 INTRODUCTION 5-1
5.2 BOARD LEVEL 5-1
5.2.1 System Problems 5-2
5.2.2 Defibrillator H.V. Problems 5-2
5.2.3 LCD Readout Problems 5-4
5.2.4 ERROR Messages on LCD 5-5
5.2.5 CRT Display Problems 5-6
5.2.6 Recorder Problems 5-7
5.2.7 Indicator Malfunction 5-9
5.2.8 ECG Signal Problems 5-10
5.2.9 Real Time Clock Problems 5-11
5.2.10 Control Problems 5-11
5.2.11 Service Mode 5-12
5.2.12 Battery Power Base Problems 5-12
5.3 COMPONENT LEVEL 5-13
5.3.1 ECG Monitor 5-14
5.3.2 ECG Analog Board (A3) 5-14
5.3.2.1 ECG Section 5-15
5.3.2.2 ECG Differential Amplifier Test Procedure 5-16
5.3.2.3 Bias Voltage Check Procedure on Differential Amplifier 5-16
5.3.2.4 Paddle Contact Indicator 5-17
5.3.3 Digital ECG Board (A-4) 5-17
5.3.4 Memory Board (A5) 5-22
5.3.5 Deflection Board (A6) 5-25
5.3.6 Clock/Heart Rate Board (A7) 5-26
5.3.7 Recorder Board (A8) 5-30
5.3.7.1 Annotation (78670A Only) 5-31
5.3.7.2 CRT Digits 5-34
5.3.7.3 Switch Functions 5-36
5.3.7.4 Recorder 5-37
5.3.8 Defibrillator Control Board (A10) 5-39
5.3.8.1 Error Messages 5-39
5.3.8.2 LCD Display 5-40
5.3.8.3 Paddle Contact Indicator 5-41
5.3.9 Defibrillator Charger Board (A-ll) 5-41
5.3.10 Pulse Width Modulator (A12-U1) 5-55
6 REPLACEABLE PARTS AND SCHEMATIC DIAGRAMS
6.1 INTRODUCTION 6-1
6.2 REFERENCE DESIGNATIONS 6-1
6.3 ORDERING INFORMATION 6-2
7 ACCESSORIES
7.1 78668A Quick-Mount Power Base 7-1
7.1.1 Theory of Operation - AC Circuits 7-1
7.1.2 Regulated Voltage Circuit 7-1
7.1.3 Raw Voltage and Battery Charge Circuit 7-2
7.1.4 Low Line Voltage Circuit 7-2
7.1.4.1 Disassembly 7-2
7.1.5 Troubleshooting Power Base 7-3
7.2 BATTERY CHARGER 78669A 7-9
VI
TABLE OF CONTENTS
Models 78670A/78671A
78670-1
7.2.1 Description 7-9
7.2.2 Charging 7-9
7.2.3 Indicator Lamps 7-9
7.2.4 Battery Charger Theory of Operation 7-10
7.2.5 Current Source 7-10
7.2.6 Circuit Voltage Regulator 7-10
7.2.7 Timing Oscillator .7-11
7.2.8 Clock Gate 7-11
7.2.9 Divide By 2048 and Divide By 4096 Counters 7-11
7.2.10 Counter Reset Gate 7-11
7.2.11 Maintenance 7-12
7.2.12 Disassembly 7-12
7.2.13 Troubleshooting Battery Charger 7-15
7.3 RECHARGEABLE NICKEL CADMIUM BATTERY - Bl 7-19
7.3.1 General Description 7-19
7.3.2 Charge Retention 7_19
7.3.3 Charging 7-19
7.3.4 Voltage Depression (Memory) 7-20
7.3.6 Cell Reversal 7-20
7.3.7 Battery Replacement 78660-60401 7-20
7.3.8 Storage of Nickel Cadmium Batteries 7-21
OPTIONS 8-1
LIST OF ILLUSTRATIONS
FIGURE TITLE PAGE
1-1 Front View Model 78670A/7861A Defibrillator 1-0
1-2 Defibrillator Waveform 1-5
1-3A Paddles 1-6
1-3B Paddle Contact Indicator 1-6
1-4 Model 78670A and 78671A Controls 1-7
1-5 Accessories Storage Compartment 1-9
1-6 Non-Fade Display 1-9
1-7 Date Time Annotation 1-11
1-8 Stored and Delivered Energy Annotation 1-11
1-9 Heart Rate and Marker Annotation 1-11
1-10 Rear Panel, Model 78670A and 78671A 1-12
2-1 Model 78670A Block Diaqram 2-1
2-2 Detailed Block Diagram, Model 78670A Foldout .2-6
2-3 ECG Source Switch 2-7
2-4 Protective Circuitry 2-8
2-5 Differential Amplifier 2-8
2-6 Right Leg Drive Circuit 2-9
2-7 ECG Leads Off Indicator Circuit 2-9
2-8 Chopper Modem and Power Supply 2-10
2-9 Chopper Driver Circuit 2-11
2-10 Baseline Restore Circuit 2-11
2-11A Fixed Gain Stage 2-12
2-11S Paddle Contact 2-13
vii
TABLE OF CONTENTS
Models 78670A/78671A
78670-1
2-12 50/60 Hz Notch Filter Circuit 2-14
2-13 Auto Gain Attenuator 2-15
2-14 Voltage to Frequency Converter 2-16
2-15 Auto Bias Circuit 2-16
2-16 Microprocessor Reset (Tickle) Circuit 2-16
2-17 CRT Display and Blanking Timing 2-17
2-18A Read/Write Sequence Delay Mode 2-18
2-18B Read/Write Sequence Fixed Trace Mode 2-18
2-19 Erase Bar Generator 2-19
2-20 Oscillator and Johnson Counter 2-19
2-21 1025 and 1026 Count Circuit 2-20
2-22A Memory to CRT Circuit Block Diagram 2-21
2-22B Memory to Recorder and Output Block Diagram 2-21
2-23 Ramp Generator 2-21
2-24 Multiplex Driver Timing 2-22
2-25 Deflection Amplifier Block Diagram 2-22
2-26 CRT Intensity Driver 2-23
2-27 CRT Blanking Circuit 2-23
2-28 Clock/Heart Rate Board Block Diagram . 2-24
2-29 Clock Circuit 2-25
2-30 Timing Diagram 2-25
2-31 Clock Circuit Read Cycle Timing 2-26
2-32 Clock Circuit Time Set Cycle Timing 2-26
2-33 Recorder Control Circuit 2-28
2-34 Recorder ECG Amplitude Limit Circuit 2-28
2-35 Microprocessor Reset (Tickle) Circuit 2-29
2-36 Microprocessor Reset Oscillator Equivalent Circuit 2-29
2-37 Microprocessor Reset Pulses 2-29
2-38 Printhead Driver Circuit 2-30
2-39 A8-U2 Drive Signal 2-31
2-40 Printhead Protection Circuit 2-31
2-41 "Ticker Reset Circuit 2-32
2-42 LCD Timing 2-33
2-43 Charge Done Tone 2-35
2-44 Paddle Contact Chopper 2-35
2-45 HV Capacitor Monitoring Circuit 2-37
2-46 Pulse Width Modulator 2-39
2-47 PWM Shutdown 2-40
2-48 HV Defibrillator Inverter Circuit 2-41
2-49 HV Monitor Circuit, 2-42
2-50 Patient Relay Circuit 2-43
2-51 Peak Dicharge Current Detector Circuit 2-44
2-52 Safety Relay Circuit 2-45
2-53 5.4 V Reference and Low Battery Shutdown Circuit 2-45
5-54 Low Voltage Power Supply Block Diagram 2-46
2-55 Pulse Width Modulator Block Diagram 2-47
2-56 Pulse Width Modulator External Circuit 2-48
2-57 Flyback Driver Circuit 2-49
2-58 Low Battery Detector Circuit 2-50
2-59 Low Voltage Supply DC Output Circuit 2-51
2-60 Flyback Transformer CRT Supply Waveform 2-52
2-61 CRT Supply Regulator 2-52
3-0 Circuit Board Locator 3-0
3-1 Energy Accuracy Test Setup 3-4
3-2 Five Gain Stages of AUTO 3-7
via
TABLE OF CONTENTS
Models 78670A178671A
78670-1
3-3 Heart Rate Accuracy and Alarm 3-7
3-4 Power Cord to Chassis Ground Resistance Check 3-9
3-5 Test Connections to Paddles 3-10
3-6 Paddle Leakage Current to Ground 3-10
3-7A Paddle Leakage Test with 115V Applied 3-11
3-7B Paddle Leakage Test with 115V Applied 3-12
3-8A Patient Lead Leakage Current to Ground Test 3-13
3-8B Patient Lead Leakage Current to Ground Test 3-13
3-9A Leakage Current Between Patient Leads Test 3-14
3-9B Leakage Current Between Patient Leads Test 3-15
3-10A Patient Lead Leakage Current Test with 115 V Applied 3-16
3-10B Patient Lead Leakage Current Test with 115 V Applied 3-16
3-11 Test Setup for Battery Capacity Check 3-17
3-12A ECG Amplifier Gain and Frequency Response Test Setup 3-40
3-12B ECG Amplifier Gain and Frequency Response Test Setup 3-40
3-13 ECG Amplifier Baseline Offset (Leads) 3-42
3-14 ECG Amplifier Baseline Offset (Paddles) 3-42
3-15 ECG Amplifier Frequency Response Setup (Paddles) 3-44
3-16 Input Offset Tolerance (DC) Leads Test Setup 3-44
3-17 ECG Amplifier Noise, Leads Input Test Setup 3-46
3-18 ECG Amplifier Noise, Paddle Input Test Setup 3-47
3-19 Calibration Step Waveform 3-48
3-20 Common Mode Rejection Test Setup (Leads) 3-49
3-21 Common Mode Rejection Test Setup (Paddles) 3-51
3-22 Heart Rate Accuracy Test Setup 3-51
3-23 Service Mode Test Pattern, Recorder 3-53
3-24 Energy Accuracy Test Setup 3-55
3-25 R Wave/Sync Pulse/Discharge Delay Test Setup 3-58
3-26 ECG Output Waveform 3-59
3-27 R Wave 3-59
3-28 Sync Pulse Superimposed on R Wave 3-60
3-29 R Wave/Sync Pulse/Discharge Pulse Relationship 3-60
4-1 Screw Locations for Disassembly 4-1
4-2 Inside View of 78670A 4-2
4-3 Circuit Board Shield Removal (78670A) 4-3
4-4 Low Voltage Power Supply Board Removal(78671A) 4-4
4-5 Defibrillator Charger Board Removal (78671A) 4-6
4-6 H.V. Component Servicing (78671A) 4-6
4-7 Cable Housing Assembly Removal (78671A) 4-7
4-8 Paddle Cable Replacement(78671A) 4-7
4-9 Paddle Cable Replacement (78671A) 4-8
4-10 Upper Housing Circuit Board Location 4-11
4-11 Front Panel Removal 4-14
4-12 Front Panel Removal 4-14
4-13 CRT Removal 4-15
4-14 CRT Yoke Assembly 4-15
4-15 Mother Board Fuse Location A2-F1 and F2 4-15
4-16 ECG Knob Removal 4-17
4-17 Energy Select Knob Removal 4-17
4-18 Energy Select Knob Removal 4-17
4-19 Recorder Assembly Removal 4-19
4-20 Recorder Assembly 4-19
4-21 Recorder Mechanism 4-20
4-22 Detail of Printhead 4-21
IX
TABLE OF CONTENTS
Models 78670A/78671A
78670-1
4-23 Top View of Recorder Housing and Beeper Speaker 4-23 /1*%
4-24 Front Panel Mounted Components on Upper Housing 4-24 '
4-25 Flex Circuit Assembly (A16) 4-25
4-26 LCD Removal Sequence 4-27
4-27 LCD Removal Sequence 4-27
4-28 LCD Removal Sequence 4-27
6-1 System Block Diagram 6-5/6
6-2 Schematic, Mother Board A2 6-7/8
6-3 Schematic, ECG Analog Board A3 6-9/10
6-4 Schematic, ECG Digital Board A4 6-11/12
6-5 Schematic, Memory Board A5 6-13/14
6-6 Schematic, Deflection Board A6 6-15/16
6-7 Schematic, Clock/Heart Rate Board A7 6-17/18
6-8 Schematic, Recorder Control Board A8 6-19/20
6-9 Recorder Assembly A9 6-21/22
6-10 Schematic, Defibrillator Control Board A10 6-23/24
6-11 Schematic, Defibrillator Charger Board A11 6-25/26
6-12 Schematic, Low Voltage Power Supply Board A12 6-27/28
6-14 Schematic, Flex Circuit Assembly A16 6-29/30
6-15 Schematic, Heart Rate Board A17 6-31/32
6-16 78670A Case Assembly A1 6-33/34
78670A Case Assembly (cont.) 6-35/36
6-17 Receptacle Cable Assembly 6-37/38
6-18 78671A Case Assembly A1 6-39/40
7-1 O'iic'<-X,.ount 0o\iw vise 7-1 --