Fukuda Denshi FX-7302 User manual

F
FX X- -7 73 30 02 2

Service Manual

•Before setting up/maintenance, please read this service manual carefully.
•Keep this manual where it can be always referred to.

Copyright © 2005 by Fukuda Denshi Co., Ltd.
No part of this document may be copied or transmitted in any form without the prior written permission
of Fukuda Denshi Co., Ltd.
Printed in Japan

i
Notice
This manual contains technical information on the FX-7302 aimed at Fukuda
Denshi service representatives and professional engineers.
Before performing maintenance the unit, read the manual carefully and use it
to help you work correctly and safely.
When you have finished using the manual, store it carefully in a designated
location.
Strictly follow the instructions of this manual whenever you perform
maintenance or make adjustments to the unit. Failure to do so may lead to a
serious accident.
Safety
This manual utilizes the graphic symbols shown below. Make sure that you
understand the meaning represented by these symbols, carefully read the
instructions given in the text, and work safely.
DANGER
Failure to follow this message may result in death or serious injury to the
patient or operator, damage to the equipment, or create a fire hazard.
WARNING
Failure to follow this message may result in death or serious injury to the
patient or operator.
CAUTION
Failure to follow this message may cause injury to the patient, or may
cause damage to the equipment.
Symbol Description
NOTE
A note is not related to product safety. A note provides
information about the proper use and operating method
to prevent incorrect operation and trouble with the
unit.
Indicates an action that must not be performed.
Indicates an action that must be performed.
REFERENCE
Indicates the reference page for the operation method.

ii
Servicing Precautions
In servicing the FX-7302, observe the following.
DANGER
Never remodel the medical electronic equipment.
If remodelled, the equipment may not ensure safe operation,
thereby causing accidental hazards to the patient and
operator.
CAUTION
The service manual is intended for the service engineers
of Fukuda representatives and the technical staff
concerned with medical electronic equipment. Servicing,
reassembling, and adjustment shall be performed by
autorized service engineers.
Prepare proper facilities and tools when servicing.
Be sure to follow the instructions of operation manual
when operating the instrument. For operating precautions,
refer to the operation manual.

iii
CAUTION
Disassembling/Reassembling Precautions
Be sure to turn the power off and disconnect the power supply cord
from the wall outlet. Then start disassembling the instrument.
When removing the main PC board, remove the battery in advance.
Take care not to disconnect and connect the key panel and sensor
board from/to the connector too frequently. Too frequent disconnection
and connection of these units may cause poor contact.
Use proper screwdrivers to loosen screws.
When reassembling, make sure all screws are tightened to original
positions and all disconnected connectors are reconnected properly.
PC Board Handling Precautions
PC boards are equipped with extremely sensitive devices to static
electricity.
PC boards are sensitive electronic assemblies. Take proper measures
for removed PC boards, e.g. put them in a conductive bag.
Handle PC boards carefully. Giving an impact to them may damage
devices mounted onto them.
Never remove a PC board or connect the connector to it when it is
supplied with power.
CAUTION
If you find a value which exceeds the allowable level, be sure to let the
user avoid using the instrument. If the user operates the instrument as it
is, he/she may receive an hazardous accident.
Equipment Classification
The FX-7302 is classified into the following equipment:
1. Protection against electrical shock
Class 1, Internally powered
2. Type against electrical shock
Applied part: Type CF
3. Degree of protection against harmful water invasion
Ordinary equipment
4. Degree of safety in using under air-inflammable anesthetic gases or
oxygen/nitrous
oxide-anesthetic gases
Equipment used under an environment containing no inflammable
anesthetic gases or no inflammable cleaning agent.
5. Running mode
Continuous running mode

iv
Overview of the Manual
This manual consists of the following 8 chapters.
Contents of each chapter are briefly explained below.
Chapter 1 Component Names and Functions
The locations and functions of the unit's operation panel, switches, connectors,
and other components. A list of specifications is also given.
Troubleshooting is given in a flowchart by symptom.
Chapter 2 Maintenance
Cleaning, test menu, program version updating, periodical inspection items,
and methods.
Chapter 3 Disassembly
How to disassemble the unit in order to replace defective parts.
Chapter 4 Electric Circuit Diagrams
Electric circuit diagrams and diagrams of the connections between printed
circuit boards.
Chapter 5 Spare Parts List
A list of components supplied as spare parts.
Chapter 6 Board Component Diagrams
The layout of the connectors and other mounted parts for each of the unit's
printed circuit boards.
Chapter 7 Assembly Diagrams
The illustrations of the parts in three dimensional exploded views.
A list of the parts is also given.
Chapter 8 Technical Instructions Related to EMC
Technical instructions required by IEC60601-1-2 Ed.2 and 60601-2-25 are
described in this chapter.

v
Contents
Notice ································································································································ i
Safety······················································································································ i
Servicing Precautions ····························································································· ii
Equipment Classification························································································· iii
Overview of the Manual ··································································································· iv
Contents···························································································································· v
Chapter 1 Component Names and Functions ······························································· 1 − 1
Unit (top face) ··················································································································· 1 − 1
Unit (side, rear, and bottom faces) ················································································· 1 − 2
Operation panel ················································································································ 1 − 4
Specifications list·············································································································1− 6
Chapter 2 Maintenance ···································································································· 2 − 1
Cleaning ···························································································································· 2 − 1
Cleaning the unit ····································································································· 2 − 1
Replacing the battery ······································································································· 2 − 2
Update of the software····································································································· 2 − 4
Installing the optional software······················································································· 2 − 5
Self-diagnostics test ········································································································ 2 − 7
User self-diagnostics test ························································································ 2 − 8
Test Pattern······································································································· 2 − 9
Recording Test ·································································································· 2 − 10
Key Test ············································································································ 2 − 12
LCD Test ··········································································································· 2 − 12
Buzzer Test ······································································································· 2 − 13
Manufacturer self-diagnostics test··········································································· 2 − 14
Status Test ········································································································ 2 − 16
Serial Test ········································································································· 2 − 17
CF CARD Test··································································································· 2 − 18
LAN Test ··········································································································· 2 − 19
Memory Test······································································································ 2 − 20
Recorder Test···································································································· 2 − 21
Touch Panel Calibration ···················································································· 2 − 23
Internal Memory Initialize··················································································· 2 − 24
Periodical inspections ····································································································· 2 − 25
Periodical inspection intervals and precautions······················································· 2 − 25
List of periodical inspection items············································································ 2 − 25
Safety inspections (6 items) ···················································································· 2 − 26
Before checking the leakage current ································································· 2 − 26
Checking the earth leakage current
(current that flows to protective earth resistance) ·············································· 2 − 28
Checking the enclosure leakage current
(current that flows from the enclosure to
the earth terminal of the power outlet) ······························································· 2 − 29
Checking the patient leakage current I ······························································ 2 − 30
Checking the patient leakage current III ···························································· 2 − 31
Checking the patient measurement current ······················································· 2 − 32
Checking the protective earth resistance··························································· 2 − 33
Inspection of electrical performance/characteristics················································ 2 − 34
Hardware inspections (10 items)············································································· 2 − 36
Periodical inspection record ··························································································· 2 − 38

vi
Chapter 3 Disassembly ···································································································· 3 − 1
Removing the enclosure cover························································································3 − 1
Removing the MAIN BOARD and the ECG AMP unit ·····················································3 − 2
Removing the recorder unit ·····························································································3 − 4
Chapter 4 Electric Circuit Diagrams ··············································································· 4 − 1
Overall block diagram of unit···························································································4 − 1
MAIN BOARD block diagram···················································································4 − 2
MAIN CPU section ·····························································································4 − 3
MAIN G/A section·······························································································4 − 3
Memory section··································································································4 − 4
AMP interface section ························································································4 − 5
LCD controller section························································································4 − 6
Thermal head control section ·············································································4 − 6
CF CARD controller section ···············································································4 − 7
Serial port control section···················································································4 − 7
Real time clock···································································································4 − 8
Wait control section····························································································4 − 8
Reset circuit section ···························································································4 − 9
Sensor control section························································································4 − 9
Speaker control section······················································································4 − 10
Power generating section···················································································4 − 10
Clock generating section····················································································4 − 12
ECG AMP BOARD block diagram ···········································································4 − 13
OPERATION BOARD block diagram·······································································4 − 14
POWER BOARD block diagram ··············································································4 − 17
CARTRIDGE BOARD (Option) ················································································4 − 17
MAIN BOARD circuit diagram (PCB-6956B) ···································································4 − 19
Power connection table No.1 ···················································································4 − 19
Power connection table No.2 ···················································································4 − 20
POWER/CAPACITOR/LED block ············································································4 − 21
+1.9 V power supply voltage generating block ························································4 − 22
VISO power supply voltage generating block ··························································4 − 23
Clock generating block ····························································································4 − 24
MAIN CPU block······································································································4 − 25
MAIN G/A block ·······································································································4 − 26
FLASH ROM block ··································································································4 − 27
SDRAM/RESET block······························································································4 − 28
Real time clock/wait control block ············································································4 − 29
CF card control block·······························································································4 − 30
SIO block ·················································································································4 − 31
Serial port block ·······································································································4 − 32
KEY/LCD I/F block···································································································4 − 33
ECG AMP IF/THERMAL IF block ············································································4 − 34
Sensor/speaker control/JTAG IF block ····································································4 − 35
LCD control block ····································································································4 − 36
LAN control block·····································································································4 − 37
POWER ON block ···································································································4 − 38
ECG AMP BOARD Circuit Diagrams (PCB-6731D) ·························································4 − 39
Power connection table/capacitor ············································································4 − 39
ECG AMP block·······································································································4 − 40
OPERATION BOARD (PCB-6957B) ··················································································4 − 41
KEY SWITCH block ·································································································4 − 41
LCD CONTRAST/BACK LIGHT CONTROL block ···················································4 − 42
MARK SENSOR BOARD (PCB-6942) ···············································································4 − 43
MARK SENSOR block ·····························································································4 − 43
MAGAZINE UP SENSOR BOARD (PCB-6943A) ······························································4 − 44
MAGAZINE UP SENSOR BOARD block ·································································4 − 44
CONNECTION BOARD (PCB-7028)··················································································4 − 45
CONNECTION BOARD block··················································································4 − 45

vii
Chapter 5 Spare Parts List······························································································· 5 − 1
MAIN BOARD (PCB-6956B) ····························································································· 5 − 1
OPERATION BOARD (PCB-6957B) ················································································· 5 − 7
ECG AMP BOARD (PCB-6731D)······················································································ 5 − 9
MARK SENSER BOARD (PCB-6942)/ MAGAZIN UP BOARD (PCB-6943A) ················· 5 − 11
CONNECTION BOARD (PCB-7028) ················································································· 5 − 11
OTHER SPARE PARTS LIST···························································································· 5 − 12
Chapter 6 Board Component Diagram··········································································· 6 − 1
MAIN BOARD (PCB-6956B component side) ································································· 6 − 1
MAIN BOARD (PCB-6956B soldering side) ···································································· 6 − 2
OPERATION BOARD (PCB-6957B component side)····················································· 6 − 3
OPERATION BOARD (PCB-6957B soldering side) ························································ 6 − 4
ECG AMP BOARD (PCB-6731D component side) ························································· 6 − 5
ECG AMP BOARD (PCB-6731D soldering side)····························································· 6 − 6
MARK SENSER BOARD (PCB-6942 component side) ·················································· 6 − 7
MAGAZIN UP BOARD (PCB-6943A component side)···················································· 6 − 8
CONNECTION BOARD (PCB-7028 component side)····················································· 6 − 9
Chapter 7 Assembly Diagrams ······················································································· 7 − 1
Recorder 1/4······················································································································ 7 − 1
Recorder 2/4······················································································································ 7 − 2
Recorder 3/4······················································································································ 7 − 3
Recorder 4/4······················································································································ 7 − 4
ECG Amp··························································································································· 7 − 5
Upper case ························································································································ 7 − 6
Lower case························································································································ 7 − 7
General assembly diagram······························································································ 7 − 8
Outline view ······················································································································ 7 − 9
Chapter 8 Technical Instructions Related to EMC ························································ 8 − 1
Emission information CISPR11······················································································· 8 − 2
Immunity information (to other than radiation/conduction) ········································· 8 − 3
Immunity information (to radiation/conduction)···························································· 8 − 4
Recommended distance of separation from portable telephone, etc.························· 8 − 5
Electrosurgery interference····························································································· 8 − 5

viii

Chapter 1
Component Names and Functions
Unit (top face) ......................................................................................1-1
Unit (side, rear, and bottom faces) ....................................................1-2
Operation panel................................................................................... 1-4
Specifications list................................................................................1-6

Chapter 1 Component Names and Functions
1 - 1
Unit (top face)
Touch panel display, operation panel, and paper magazine are
provided on the top face of the unit.
(1) Touch-panel display
Displays ECG waveforms, patient information, and equipment
status. Used also to enter patient data or perform various
operations by tapping the touch-panel keys (soft keys) provided
on the screen.
(2) Operation panel
Provides the controls for the Cardimax FX-7302 operation.
(3) Magazine open button
Press to open the magazine cover.
(4) Paper magazine
Load the recording paper in here.
(5) Thermal print head
Records (prints) the ECG waveforms and characters, such as the
measured values.
(2) Operation panel
(1) Touch-panel display
(5) Thermal print head
(4) Paper magazine
(3) Magazine open
button

Chapter 1
1 - 2
Unit (side, rear, and bottom faces)
PATIENT connector, LAN port, SERIAL port and CF card drive
are provided on the side of the unit.
AC inlet and potential equalization terminal are provided on the
rear face of the unit.
BATTERY PACK compartment and HANDLE are located on the
underside of the unit.
(6) PATIENT connector
Plug in the patient cable here.
(7) CF card eject button
Flip up this button and press to remove a CF card from the drive.
(8) CF card drive
Insert an optional CF card for storing ECG data in this drive.
(9) SERIAL port (RS-232C)
Connect cable (RS-232C) here to connect external equipment
such as a stress exercise system.
(10) LAN port (10 BASE-T)
Connect cable (10BASE-T) here to connect external equipment
such as a personal computer.
(11) AC inlet
Plug in the matching end of the power supply cord here.
(12) Potential equalization terminal
Connect the potential equalization cable (CE-12) to this terminal.
(10) LAN port (10 BASE-T)
(9) SERIAL port (RS-232C)
(8) CF card drive
(7) CF card eject button
(6) PATIENT connector
(13) HANDLE (14) BATTERY PACK compartment
(11) AC inlet
(12) Potential
equalization
terminal

Component Names and Functions
1 - 3
(13) HANDLE
It is a handle for carrying this equipment.
(14) BATTERY PACK compartment
Install the optional battery pack (T8HR4/3FAUC-5345) in this
compartment.

Chapter 1
1 - 4
Operation panel
The electrocardiograph can be operated on the operation panel and touch
panel. The LED that indicates the operation status is at the upper left-hand
corner of the operation panel.
Main
Power Charge
ON RESET
LEAD
1mV
REVIEW START/STOP
POWER
OFF
(stby)
/
OFF : HOLD 2sec
(1) [POWER ON/OFF (stby)] key
Press this key to switch FX-7302 to power ON from standby status. Press
this key for 2 seconds or more to switch FX-7302 from power ON to
standby status. Also, press this key for 10 seconds or more to forcibly turn
OFF FX-7302 in case there is a system trouble.
When you operate FX-7302 on the rechargeable battery, use this key to turn
the power ON and OFF. If the power supply cord is connected to a wall
outlet and the rechargeable battery is installed, FX-7302 will start charging
the battery as soon as the unit is put in standby status (power is OFF).
(2) [1mV] key
Press this key to display and record the calibrated 1mV waveform.
(3) [RESET] key
Press and hold down this key to reset the ECG waveform. ECG waveform
input starts when you release this key.
(4) LEAD [ ] and [ ] keys
Press these keys to change the leads to be monitored.
(5) [REVIEW] key
Press this key to perform Review Recording. Review Recording starts
sampling waveforms from those sampled 10 seconds prior to pressing
[REVIEW].
(6) [START/STOP] key
Press this key to start and stop the various recording (sampling) tasks.
(6) [START/STOP] key
(3) [RESET] key
(4) LEAD [ ] and [ ]key
(1) [Power ON/
OFF (stby)] key
(2) [1mV] key
(5) [REVIEW] key
(8) Charge lamp
(7) Main power lamp

Component Names and Functions
1 - 5
(7) Main Power lamp.
This lamp lights during the standby and power ON statuses.
(8) Charge lamp
The lamp flashes in blue while the rechargeable battery pack is being
charged. The Charge lamp flashes in amber if any trouble such as abnormal
battery temperature, battery voltage, or charge current occurs during
charging. If the Charge lamp lights in amber when you retry recharging,
contact your local Fukuda Denshi sales and service representative.

Chapter 1
1 - 6
Specifications list
Leads Standard 12 leads
Sensitivity 1/4, 1/2, 1, 2cm/mV, or automatic
Polarization voltage ±550mV or greater
Frequency response 0.05 to 150Hz
Time constant 3.2 sec
Common mode rejection 2mmp-p or lower (103dB or more)
Input impedance 50M ohms or greater
Input circuit current 5 x 10-8 A or lower
Internal noise 20µVp-p or lower
Calibrated voltage 1mV ±2% or lower
Sampling rate 8000/Sec/CH
Filter
HUM filter: -20dB or less at 50/60Hz
Muscle filter: -3dB (-6dB/oct) at 25/35Hz
Drift filter: -3dB or less at 0.25/0.5Hz
Recording system Thermal array head
Recording speed 5, 10, 12.5, 25, 50mm/sec.
Recording resolution Deflection axis: 8 dots/mm
Time axis: 500μsec.
Recording channels 3CH, 3CH+rhythm lead, 6CH
Recording paper Roll recording paper: OP-358TE (145mm x 30M)
Z-fold paper: OP-383TE (145mm x 100M)
Display Type: Liquid crystal display (LCD) with backlighting
Resolution: 320 dot (horizontal) x 240 dot (vertical)
Electro-
cardiography
Patient data ID number, age, sex, height, weight, etc.
Basic measurement value Heart rate, R-R time, P-R time, QRS time, QT time, QTc,
electrical axis, SV1, RV5(6)
Heart Rate measurement 20 to 300 BPM
Measurement
Operation
Accuracy ±2 BPM
Interpretation and code Approx. 110 types
Minnesota code Approx. 130 types
Analysis operation
(When the
PC-7303 or
PC-7304 program
cartridge is
installed)
Grade judgment 4 types
Safety standard IEC60601-1 (Class I, type CF; Internally powered
equipment, type CF)
Power supply
AC power supply: 100 to 240V AC (±10%), 50/60Hz,
Power consumption: 80VA
DC power supply: Ni-MH battery
(T8HR4/3FAUC-5345),
Power consumption: 60W
Dimensions 315mm (W) x 255mm (D) x 76mm (H)
(12.4” x 10.0” x 2.99”)
General
Weight Approx. 3.5kg (7.7 lbs.)
Temperature +10 to +40 degrees Celsius (50 to 104 degrees
Fahrenheit)
Operating
environment Humidity 25 to 95% (no condensation)
Atmospheric pressure 70 to 106kPa (700 to 1060mbar)
Storage
environment Temperature -10 to +50 degrees Celsius (14 to 122 degrees
Fahrenheit)
Humidity 10 to 95% (no condensation)
Atmospheric pressure 70 to 106 kPa (700 to 1060mbar)

Chapter 2
Maintenance
Cleaning............................................................................................... 2-1
Cleaning the unit .....................................................................2-1
Replacing the battery.......................................................................... 2-2
Update of the software........................................................................ 2-4
Installing the optional software.......................................................... 2-5
Self-diagnostics test ...........................................................................2-7
User self-diagnostics test ........................................................ 2-8
Test Pattern ........................................................................ 2-9
Recording Test ................................................................. 2-10
Key Test............................................................................ 2-12
LCD Test........................................................................... 2-12
Buzzer Test....................................................................... 2-13
Manufacturer self-diagnostics test......................................... 2-14
Status Test........................................................................ 2-16
Serial Test......................................................................... 2-17
CF CARD Test.................................................................. 2-18
LAN Test........................................................................... 2-19
Memory Test..................................................................... 2-20
Recorder Test ...................................................................2-21
Touch Panel Calibration.................................................... 2-23
Internal Memory Initialize .................................................. 2-24
Periodical inspections ......................................................................2-25
Periodical inspection intervals and precautions .................... 2-25
List of periodical inspection items ......................................... 2-25
Safety inspections (6 items) .................................................. 2-26
Before checking the leakage current ................................ 2-26
Checking the earth leakage current
(current that flows to protective earth resistance) ............. 2-28
Checking the enclosure leakage current
(current that flows from the enclosure to
the earth terminal of the power outlet) .............................. 2-29
Checking the patient leakage current I.............................. 2-30

Checking the patient leakage current III............................2-31
Checking the patient measurement current ......................2-32
Checking the protective earth resistance ..........................2-33
Inspection of electrical performance/characteristics..............2-34
Hardware inspections (10 items)...........................................2-36
Periodical inspection record ............................................................2-38