Nihon-Kohden ECG-9020 Service manual

1. GENERAL

ECG-9020K
Electrocardiograph

ECG-9020K

RK-0002 Bottom Casing Assy

RK-0003 Internal Parts

GC-0011 Motor Assy

RH-0001 Magazine Assy

RK-0004 Thermal Head Assy

RK-0005 Speaker Assy

RK-0006 Battery Terminal Assy

RK-0009 ECG-9020K Top Casing Assy

SC-903D Power Unit

UT-23561 ECG Control Board

UT-2357 Flash ROM Board

(Optional)

VL-0001 LCD Assy

KD-103E Cart

KH-801E Patient Cable Hanger

DI-106D Fixing Plate for Cart

YC-901D Carrying Case

••

• To order a replacement assembly above, use the Code No.

••

••

• To order a replacement component inside an assembly, refer to “Section 7

••

Replaceable Parts List”.

1.12 Service Manual ECG-9010/9020 Rev A

Composition

ECG-9620 Standard Components

1. GENERAL

ECG-9620L
ECG-9620M
ECG-9620N
ECG-9620P
ECG-9620S
ECG-9620T
ECG-9620U

RHC-0004 Record Assy

RHC-00041 Motor Assy

UTC-0009 Paper senser board

UTC-0010 Motor sensor board

RHC-00042 Magazine Assy

RKC-0001 Transfer Assy (220 V) for L and P version
RKC-0002 Transfer Assy (230 V) for M version
RKC-0003 Transfer Assy (240 V) for N version
RKC-0004 Transfer Assy (110 V) for S version
RKC-0005 Transfer Assy (120 V) for T version
RKC-0006 Transfer Assy (127 V) for U version

UTC-0006 Key board

UTC-0007 ECG control board

Options

UTC-0008 Power board

KD-103E Cart

KH-801E Patient Cable Hanger

· To order a replacement assembly above, use the Code No.

· To order a replacement component inside an assembly, refer to “Section 7

Replaceablet Parts List”.

Service Manual ECG-9620 1.17

Location

1. GENERAL

Motor Assy

Speaker Assy

ECG Control Board

Thermal Head Assy

LCD Assy (for ECG-9020K only)

Flash ROM Board

Inverter Board
(for ECG-9020K
only)

Pow er Unit

Service Manual ECG-9010/9020 Rev A 1.13

1. GENERAL

Location

Thermal Head Assy

Buzzer

Motor Assy

LCD

Ke y board

ECG control board

Transfer Assy

Power board

1.18 Service Manual ECG-9620

1. GENERAL

Block Diagram

NOTE

The LCD module and inverter board are used for the ECG-9020K only.

AC
source

Piezo-electric
buzzer

Motor, Motor sensor,
Mark sensor

Membrane key

LCD module

2 pin

5 pin

Inverter board

Thermal head

CN11 (3pin)

Po wer Unit (SC-903D)

CNA011

CNA012

CNA015

CNA013

CN31 (16pin)

CNJ032 (2pin)

CNJ036 (12pin)

CNJ033 (40pin)

CNJ012 (12pin)

CNJ013 (6pin)

CNJ011 (12pin)

CN021
(30pin)

CN51 (4pin)

Flash ROM Board

ECG Control Board

(UT-23561)

CNJ035 (30pin)

(UT-2357)

CNJ011 (80pin)

CNJ021 (80pin)

CNJ031 (D-SUB 9pin)

CNJ043 (mini jack)

CNJ041 (mini jack)

CNJ091 (D-SUB15pin)

SIO

EXT-IN

CRO

Patient Input

Battery

CNA014

1.14 Service Manual ECG-9010/9020 Rev A

ECG Control board

ECG input
connector

EXT input Amp/
A/D converter

RS232C driver

CRO Amp/
A/D converter

Flash ROM
board 2 MB

ROM

DRAM

A/D

ROM
system software

GA

Isolater

Port

CPU I/F

ECG I/F LCD control

RTC

Backup batttery

32 bit CPU

Flash ROM
256KB
Data filing

Gate array

Flash ROM
1 MB

Font,
Local langrage

LCD module Inverter board

Video RAM
16 KB

Sound I/F

Motor assy

Paper senser

Buffer RAM 8 KB
for thermal head

Thermal head

Power unit

AC input

Operation panel

Battery

Battery charger

Switching
regulator

4 bit CPU

Battery voltage
detection

AC/DC
selecter

Thermal head temperature detection

DC/DC
converter

Switching
regulator

Charge
pump

+5 V
+12 V

+24 V to Thermal head

Paper/paper
mark detection

Block Diagram

5. BOARD/UNIT DESCRIPTION

Buzzer

Motor

Motor sensor

Paper sensor

Thermal head

CNJ101 (34 pin)
Key board

CNJ201 (12 pin)

LCD

Patient cable connector

CNA011

CNA012

CNA013

CNJ021 (80 pin)

CNJ032 (2 pin)

CNJ036 (10 pin)

CNJ011 (16 pin)

CNJ033 (24 pin)

CNJ031 (9 pin)

SIO connector

CNJ043
(miniature plug)

External input connector

CNJ041
(miniature plug)

CRO output connector

ECG control board

CNJ091 (D-sub 15 pin)

Battery
(SB-901D)

CNJ035 (30 pin)

CNJ201 (30 pin)

Power board

CNJ102 (3 pin)

CNA014

CNJ101
(2 pin)

Power
transformer unit

AC socket

Service Manual ECG-9620 5.1

Operation BD

AC INPUT

LCD

320x240

TRANS

SW

ECG control BD

Lead Fail
Detection

Pace Marker

Detection

12V Reg

16bits CPU

A/D Conv

4bits CPU

PWM Control

Gate Arry

EEPROM

DC/DC conv

DC/DC conv

+12V,-12V
+2.5V,-2.5V

5V

24V

12V

TRANS

T.H 256 Kbits SRAM

AC-DC Conv

Contrast Control

Main CPU

2 MB FlashROM

Data Files
System Setting

16 MB FlashROM

Program
Font

16 Mbits DRAM

CLOCK RTC

Gate Arry

DC/DC Conv

+8V,-8V

A/D Conv
Ext In Amp

CRO AMP

RS232C

Speaker AMP

Paper Sensor

Motor Sensor

SPEAKER

+

A

-

MOTOR

Charge

Power BD

Control

12V

LCD 256 Kbits SRAM

Thermal head

24V

R

L

F

C1

C2

C6

I

II

R1R1R1

C1

C2

C6

I = L - R
II = F - R
III = II - I
aVR = I + II/2
aVL = 2I - II/2
aVF = 2II + I/2

Connection Diagram

Index Connector No. NK Code No. Description

1* CNA011 543993A ZHR-2 speaker cable (L50)
2 CNA012 544002A ZHR-12 motor cable (L120, 65)
3 CNA013 544029B FCN723/DF11(100)/51021(40)
4 CNA014 544011A EHR-4 battery terminal cable (L150)
5 CNA015 544038A 51021-0500/51021-0600 (L50)

* We cannot provide this ca ble se per ately; we can only provide it as part of a complete Speaker assy. Refer to

“Speaker Assy” in Section 8.

1. GENERAL

CNA011

CNA013

CNA012

CNA015

CNA014

Service Manual ECG-9010/9020 Rev A 1.15

6. DISASSEMBLY

No. Code No. Description

CNA011 08SK3.670.00216A ZHR-10 L=120, 90, 130 between motor assy and ECG control board
CNA012 08SK3.670.00181B PHR-16 L=80, between thermal head and ECG control board
CNA013 08SK3.670.00172A PHDR-24VS (W=100), between key board and ECG control board
CNA014 08SK3.670.00199B SHDR-30V-S-B (W=60), between power board and ECG control board

CNA011 cable

CNA012 cable

CNA013 cable

CNA014 cable

Service Manual ECG-9620 6.3

ECG-9620

Power supply Connector Pin No.

+5 V for digital circuit CNJ201 (Power BD) -

CNJ035 (ECG control BD)

+12 V for analog circuit CNJ201 (Power BD) -

CNJ035 (ECG control BD)
+24 to 30 V for thermal
head
+5 V for LCD CNJ201 (Key BD) to LCD module pin 7 (GND: pin 2)
Motor CNJ036 (ECG control BD) -

ECG-9020

Power supply Connector Pin No.

+5 V for digital circuit CNJ201 (Power unit) -

+12 V for analog circuit CNJ201 (Power unit) -

+24 V for thermal head CNJ301 (Power unit) -

+28 V for LCD CNJ013 (ECG control BD) -

+12 V for LCD
backlight
Motor CNJ036 (ECG control BD) -

CNJ201 (Power BD) -

CNJ035 (ECG control BD)

Motor/Motor sensor/Paper sensor

CNJ035 (ECG control BD)

CNJ035 (ECG control BD)

Thermal head

LCD module

CNJ012 (ECG control BD) -

Inverter BD

Motor/Motor sensor/Paper sensor

pin 12 to 14
(GND: pin 15 to 23)
pin 10 to 11
(GND: pin 15 to 23)
pin 24 to 30
(GND: pin 15 to 23)

Motor rotation detection: pin 8
Motor power (+): pin 9
Motor power (-): pin 10
GND: 3

pin 25 to 27
(GND: pin 1 to 15)
pin 28 and 29
(GND: pin 30)
pin 1 to 6
(GND: pin 7 to 24)
pin 12
(GND: pin 11)
pin 1
(GND: pin 2)
Motor rotation detection: pin 10
Motor power (+): pin 11
Motor power (-): pin 12
GND: 8

9. TROUBLESHOOTING AND ERROR MESSAGES

Checking the Software Version

The software version numbers are also printed at the bottom space of the paper in

automatic or manual ECG recording.

Model

System Software

ECG analysis

Input unit

9.10 Operator's Manual ECG-9620

9. TROUBLESHOOTING AND ERROR MESSAGES

System Information and Error History

During power-up and operation the cardiograph continuously checks itself for

system failure. If a failure is detected, system information and error history are

printed on the recording paper and all operations are stopped. System information

and error history are also printed due to transient noise. After printing the system

information and error history, the power of the instrument is automatically turned

off.

If the same system information appears again after restarting the

cardiograph, do not use the cardiograph until service personnel has

corrected the cause of the problem. Sending a copy of the system

information to your nearest Nihon Kohden distributor helps us to

troubleshoot your problem quickly.

NOTE

System Information

Indicates an error number to identify the problem. Refer to the Service manual.

Error History

Indicates the latest three errors and the date of the latest error, as in the example

below.

Operator's Manual ECG-9620 9.9

System Error Message

During power-up and operation the instrument continuously checks itself for
system failure. If a failure is detected, system information and error history are
printed on the recording paper and all operations are stopped. System information
and error history are also displayed or printed due to transient noise. After printing
the system information and error history, the power of the instrument is
automatically turned off.

3. TROUBLESHOOTING AND SYSTEM ERROR MESSAGE

NOTE

If the same system information appears again after restarting the
instrument, do not use the instrument until service personnel has
corrected the cause of the problem. Sending a copy of the system
information to your nearest Nihon Kohden distributor helps us to
troubleshoot your problem quickly .

System Information

Indicates an error number to identify the problem. To solve the problem, do the
corrective action described below.

Error No. Meaning Corrective Action

00 Input unit error: An interrupt signal of 2 ms

is generated.

01 Input unit error: There is no response to the

host.

02 Input unit error: Communication protocol

error.
03 4 bit CPU error: Initialization error. Replace the ECG control board.
04 4 bit CPU error: “No response” error. Replace the ECG control board.
05 A key on the key board is short-circuited. Replace the key board.
06 RTC error: No interrupt signal of 125 ms. Replace the ECG control board.
07 RTC error: Incorrect data in SRAM. Replace the ECG control board.
09 The lithium battery to back up the date and

time and all system settings is completely

discharged. The system settings other than

the items described in the following note

are returned to the factory initial settings.
10 Bus error. Replace the ECG control board.
11 Address error. Replace the ECG control board.

Replace the ECG control board.

Replace the ECG control board.

Replace the ECG control board.

Replace the ECG control board. The
lithium battery is in the real time clock IC
on the ECG control board. The date and
time is reset to January 1, 1980.

Service Manual ECG-9620 3.7

3. TROUBLESHOOTING AND SYSTEM ERROR MESSAGE

Error No. Meaning Corrective Action

12 Illegal command. Replace the ECG control board.
13 Zero division error. Replace the ECG control board.
14 Power off time out. Replace the ECG control board.
15 EEPROM error: This occurs due to the

EEPROM check error, installed language
error or communication error between the

host and EEPROM.
16 Local language flash memory error. Replace the ECG control board.
17 ECG model error. Replace the ECG control board.
18 Local language is not installed. Install the local language.
19 Local language is not installed. Install the local language.

Error in memory area for local language. Re-install the local language.
20 Local la nguage text file version does not

match the ECG software version.
21 ECG interpretation error (Time over). Check the input waveforms. If any noise

22 The entered information does not match

the data in the flash memory.
27 Program version error. The program is

updated.

Replace the ECG control board.

Install the local language text file which is
the same version as the ECG software.

is superimposed on the waveforms, find
and eliminate the cause. If no noise is
superimposed on the waveform, replace the
ECG control board.
Replace the ECG control board.

Turn the power off, then on and check that
the ECG waveforms are displayed
correctly.

NOTE

••

• “Error 05” also appears when any key on the operation panel is

••

pressed and held down.

••

• When “Error 08” appears, the following settings are not reset to

••

the factory initial settings even if the instrument is initialized.

- display language - hum filter

- hospital name - direct/modem connection

- recording resolution setting - elapsed time

- local language font - saved ECG data

3.8 Service Manual ECG-9620

System Test

Calling up the System Test Screen

Test Level 1: Power on with pressing and holding the FEED/MARK key [8].

Test Level 2: Power on while pressing and holding the FEED/MARK key [8] and

AUTO/MANUAL key [CLR].

The list of the system test items is printed. You can start each system test by entering the

number with a key switch.

Test No. Page Item Memo

T1-00 4.7 Demonstration ECG analysis is available.
T1-01 4.8 Recorder Slant lines

Characters H and X
Grid
Paper speed scales (10, 12.5, 25 and 50 mm/s)

T1-05 4.17 Input unit (analog)

(Check result is printed)

T1-06 4.18 Calibration

(Check result is printed)

T1-04 4.15 LCD/LED
T1-02 4.12 Key

(Check result is printed)

T1-07 4.19 Communication For transferring ECG data files
T2-02 4.25 Thermal head check and

adjustment

Lead off detection and patient cable check

Sensitivity, TC for lead I, II V1 to V6
Digital processing circuit

ECG-9620: Enter the number according to the

resistance (T2-41 to 49)

Reference

System Setting: Power on while pressing and holding the COPY/CAL key [0].

――――

Q & A

(ECG-9010/9020/9110/9130)

1. The life time of the battery (LCT-1912ANK/12V1.9Ah)

• The capacity of the battery will be half by discharging and charging 300 times. Although it depends on frequency

in use of the doctor, the life time of the battery is about 1 year. Also replace the battery when it cannot last for 15

minutes during battery operation at the temperature between 20 and 30 degrees.

2. The life time of the thermal head

• Replace the thermal head after 30 km recording. For example, if the paper is used 60 cm (6 channel auto

recording + analysis + dominant) per one patient, it can be record for about 5000 patients.

3. The life time of the LCD backlight (ECG-9020/9130)

• The brightness of the backlight may be half by using 10000 hours. In other word, it may last 6 years by using 6

hours a day and 5 days a week.

――――

4. The life time of the lithium battery.

• Replace the lithium battery on the ECG control board when the No. 08 or 09 system error message appears or after

the lithium battery is used for 7 years. The life time of the lithium battery is about 7 years. The parts number and

the cord number is as follows.

NK parts number: BR2032/1F2

NK cord number: 3907653

5. We know that the ECG-9010/9020/9110/9130 does not function stress test. But we want to examine the stress

test on the manual mode by using those ECG. Do you have any recommended patient cable to use in the stress

test.

• As you know already, the ECG-9010/9020/9110/9130 does not function stress test. But we are preparing the patient

cable for the disposable electrode. You can specify the lead length of limb and chest. Please see the attached

paper.

6. During AC operation without battery, the power was turned off. And the "system error 22" was printed. How

do I have to do?

• Regarding ECG-9010 and 9020, it occurred because the condenser does not include on the control board. Please

confirm the S/N of the ECG. The following S/N is the already measured. There is not problem regarding ECG-

9110 and ECG-9130.

ECG-9010: 00312 or later

ECG-9020: 00182 or later

However even if the ECG-9010, 9020, 9110 or 9130 is operated AC power, use the battery necessary in order to

prevent the trouble. Because battery works as a condenser. If the "error 22" occurs, the ECG must be returned to

Nihon Kohden for repair.

1

7. Regarding ECG-9010, 9020, 9110 and 9130, the analysis age is more than 3 years old. Cannot you analyze

under the age of 3?

• We Nihon Kohden analyze the ECG data by getting the ECG data from certain hospital to estimate by age standard.

However we cannot estimate the data enough under the age of 3 because the data is a very few. So we cannot

warranty the analysis result about under age of 3.

8. Can the ECG-9010, 9020, 9110 and 9130 be connected with the mechano-cardiograph amplifier?

• The mechanocardiograph is as follows.

Model name: AK-101E

Connection cable: YZ-014H8

The ECG-9010 and 9020 has one terminal of analog output. The ECG-9110 and 9130 have two analog output

terminals.

9. Regarding ECG-9020, the ID number of the patient is named automatically. Can we modify the ID number or

patient information?

• The ID number of the patient cannot be modified on the ECG-9020. If the saved data on the ECG-9020 transfer to

the PC, the data can be modified freely.

10. We select the "Local language" in the system setting without installation of the local language. The "system

error 18" is printed out when turn the power on.

• The phenomenon is no problem. If you want to select the "local language" in the system setting, please install the

local language. Otherwise you have to select the "English" in the system setting.

11. The doctor wants to save the ECG data without recording.

• When the ECG data can be saved without recording, the doctor has to judge the data only by seeing display. We

cannot hold responsible if the saved data is very noisy when recording later. That is way we cannot standardize

the function.

12. Can the ECG-9130 use the PCMCIA card which come onto the market?

• The memory card can be used for the ECG-9130 is only QM-040V. The access timing of the memory card which

is produced by SUNDISK Corporation has recently been changed without report. Therefore for ECG-9130 and

ECG-9320 you can only use the memory card which is produced by Nihon Kohden. Otherwise we cannot

guarantee accurate function.

13. We have the ECG-9130 but the ECG cannot save the data even if using the PCMCIA card, QM-040V. How do

we have to operate to save the ECG data?

• Please confirm the S/N of the ECG you have. If the S/N of the ECG is under 00240, the ECG has to be upgraded.

Please refer to the attached material and contact the sales person in charge. We will measure as soon as possible.

14. Regarding ECG-9020 and ECG-9130, the data can be transferred by using the modem. In the future, can the

data be transferred to the fax.

• We are sorry that we have no plan at the present.

2

1/1

Figure 1

How to upgrade

Caution:

The board can be damaged by static
electricity.
Prepare the upgraded ROM on an
anti-static. (Refer to Fig. 3)

1. Record the list of the system set before
the replacement.

2. Open the back cover with a phillips head.
(Refer to Fig. 1)

3. Pull out the ROM board with a pair of
pliers. Be careful not to damage the
board. (Refer to Fig. 2)

Figure 2

Figure 3

Figure 4

4. Put the ROM board on the anti-static
sheet. (Refer to Fig. 3)

5. Insert the upgraded ROM board. (Refer
to Fig. 4)

6. Close the cover with 2 screws. (Refer to
Fig. 5)

7. Turn the power on.

ü

At this time the backlight is lit but
nothing is displayed for 5 seconds.
And system error (No. 27) is recorded
automatically with the error sound.
But this is no problem. Do not turn the
power off. The power is turned off
automatically after the recording.

8. Turn the power on and set the system
setting as referring the list recorded at
procedure 1.

After replacement, please return the
old ROM board to us immediately,
wrapped in an anti-static sheet.

Figure 5

Troubleshooting

Problem

1. The power LED light but there is no display or backlight on the LCD screen.

2. The instrument does not operate on the battery power.

3. No key or switch operation.

4. Only certain electrode lead waveforms are displayed on the screen or noise appears on all

waveforms.

5. No electrode lead waveforms are displayed on the screen or noise appear on all waveform.

6. The instrument does not operate on AC power.

7. Vertical and horizontal strips appear on the LCD screen at contrast intervals.

8. No sound.

9. The recorder does not feed the recording paper when the start switch is pressed.

10. The recording paper is fed but there is no printing.

11. The paper mark cannot be detected.

12. The recording paper tracks zigzag or to one side.

Getting Clear and Accurate ECG Recording

Artifact and Interference

Leakage Current

Figure Leakage Current
If a wire or insulation gets dusty, damp or oily or develops tiny cracks, it is no longer fully

insulated. This “leaky” insulation provides an unwanted path for a tiny amount of current
between the AC power source and ground.

Typical paths for leakage current are:
AC wall outlet → floor → bed → PATIENT → patient cable → ECG machine → ground
ECG machine → patient cable → PATIENT → bed → floor → earth ground

Leakage current is on the order of microvolts so it is too weak for a person to sense.
However, leakage current can cause microshock and AC interference (hum) in ECG
measurement.

To prevent leakage current, do the following steps:

1. Connect a metal bed to the (electric) ground.

2. Spread a shield sheet beneath the patient.

3. Mount an insulator to each leg of the bed.

4. Securely connect the ECG unit to the (electric) ground.

1/7

Electrostatic Induction

Figure Electrostatic Induction
Many of us remember how, as children, we rubbed a piece of celluloid against a shirt and

then held it over scraps of paper on a desk. The celluloid attracted the pieces of paper
because rubbing the celluloid made it electrically charged. Some materials like celluloid
are easily charged in this way.
This phenomenon is called electrostatic induction and it is the principle by which a
capacitor works. An electrically charged material can induce an electrical charge in a
nearby material, even through the air. In other words, if an insulator separates two
conductors, an electrical charge in one conductor induces an opposite charge in the other
conductor. The symbol of the capacitor represents two plates separated by a thin insulator.

Electric induction can also be found between a indoor wire for a wall light or ceiling and
the human body.

To eliminate electric induction:

z Place the patient as far from the AC power outlet and AC power line as possible.
z Connect a metal bed to a ground
z Insert a shielding sheet between the body of the patient and the bed for insulation.

2/7

Electromagnetic Induction

Figure Electromagnetic Induction
You can demonstrate the phenomenon of electromagnetic induction by winding a wire

around a non-conductive rod and connecting it to a battery and switch. Wind a second
wire around the rod so it doesn't touch the first wire, and connect the second wire to an
ammeter. When you turn on the switch, the ammeter needle jumps for a second. When
you turn off the switch, the ammeter needle jumps again.

A constantly changing electrical current produces a constantly changing magnetic field
around it. Conversely, a constantly changing magnetic field induces a constantly
changing electrical current in any nearby conductor. (A constant magnetic field or DC
current does not cause electromagnetic induction.) Electromagnetic induction is the
principle behind coils and transformers. [This principle also allows such things as
generators, alternators and windmills which involve electricity and mechanically turned
magnets.]

The 50/60 Hz AC current in a power cord induces a changing electromagnetic field around
it. If another conductor, such as a patient cable, runs parallel to the AC cord, the
electromagnetic field induces a weak 50/60 Hz current in the patient cable. This results in
50/60 Hz noise mixed with the ECG signal--AC hum.

3/7

Electrodes and Skin Contact Impedance

Figure Electrode and Contact Resistance
When measuring the ECG waveforms, skin preparation of the electrode attachment sites is

very important. Failure to do this can cause impedance between the surface and the
electrode which will result in noise.

To prepare the skin, thoroughly clean it with cotton soaked in alcohol. Next, apply a thin
coat of Cardiocream to the surface of the electrodes and the area where they are to be
placed on the skin.

Contact resistance on the surface of the skin can reach as high a level as 100 k ohm if the
skin is dry. However, contact resistance can be reduced to the less than 10 k ohm if the
skin preparation described above is carefully followed.

4/7

Electrodes and Polarized Voltage

Figure electrode and Polarized Voltage
The combination of electrode, cream and skin forms a kind of battery cell which can

generate a polarized voltage of up to 100 mV. When polarized voltage is high, it causes
baseline fluctuations.

To prevent polarized voltage:

z Use good quality electrodes e. g. silver chloride electrodes.
z Clean the electrodes thoroughly to keep the surfaces smooth and even.
z Do not use abrasive cleanser pr steel wool to clean electrodes.

5/7

EMC (Electromagnetic Interference)

The following describes some common interference sources and remedial actions:

• The equipment and/or system is not grounded:

For AC powered equipment and/or system. use the provided grounding cable to connect
the equipotential terminal of the equipment to the grounding system of the facility.

• Strong electromagnetic interference from a nearby emitter source such as an authorized

radio station or cellular phone:
Install the equipment and/or system at another location if it is interfered by an emitter
source such as an authorized radio station. Keep the emitter source such as cellular
phone away from the equipment and/or system.

• Radio-frequency interference from other equipment through the AC power supply of

the equipment and/or system:
Identify the cause of this interference and if possible remove this interference source.
If this is not possible, use a different power supply.

• Effect of direct or indirect electrostatic discharge:

Make sure all users and patients in contact with the equipment and/or system are free
from direct or indirect electrostatic energy before using it. A humid room can help
lessen this problem.

If the above suggested remedial actions do not solve the problem. consult your Nihon
Kohden Corporation subsidiary or distributor for additional suggestions.

6/7

Location of the Instrument

The electrocardiograph is an instrument to record a very small electric potential change.
Ideally, it is recommended that the instrument is installed in a shielded room which
provides constant environmental conditions. If this is not possible, the examination
location should be carefully selected as follows.

z The room should be equipped with a local 3-prong outlet where the third contact is

grounded.

z The instrument should not be installed near a power line, dynamo or motor which has

electromagnetic induction.

z The instrument should not be installed near equipment with a high power consumption,

such as large-scale X-ray equipment.

z A room adjacent to an area which has electrosurgical units or RF therapeutic

equipment should be avoided.

z A room with no excessive noise, vibration, sunshine, high-humidity or water splashes

should be selected.

Check before Turning Power On

1. Is the instrument grounded properly

z Is the grounding pin of the power cord broken or damaged ?
z Is the AC wall outlet properly grounded ?

2. Is the power cord connected properly ?

z Is the power cord plugged in to the outlet firmly ?
z Is the power cord free from entanglement with other cords ?

3. Are the patient cables connected properly ?

z Are the patient cables sufficiently separated from the power cord ?
z Are the patient cable tips firmly connected to the correct electrodes ?

4. Have the electrodes been properly prepared ?

z Has the skin been cleaned of oil and prepared with a high quality ECG electrolyte

cream ?

z Are electrodes (especially chest electrodes) free from contact with each other ?
z Are the electrodes free of corrosion, pit marks and scratches ?

5. Is the sufficient recording paper in the instrument ?

6. Is the patient comfortable ?

z Is the bed sufficiently wide and long to support the patient’s limbs fully ?
z Is the patient relaxed ?
z Is the examination room warm ?

When the instrument and the patient are found to be free from improper conditions
according to the above checks, turn on the power switch of the instrument.

7/7

The cardiograph simultaneously acquires 10 seconds of 12 lead ECG waveforms, then
analyzes the ECG waveforms. After analyzing the waveforms, the cardiograph records the
ECG waveforms and analysis result according to the format set by the DIP switches on the
right side panel.

Acquired and analyzed waveforms (10 seconds)

Lead I, II, III Recorded
Lead aVR, aVL, aVF Recorded

Lead V1, V2, V3 Artifact Recorded
Lead V4, V5, V6 Artifact Recorded

The Analysis switch is pressed

2.5 s

.

Generally, we attach the limb electrodes at first, then attach the chest electrodes. When
chest electrode attachment is complete, the limb electrodes are stable but chest electrodes
are not stable. If you press the Analysis switch to start recording soon after electrodes are
attached, artifact may easily superimpose on the chest leads. Please wait 10 seconds for
stable ECG waveforms after electrodes are attached.

Please understand that this is normal for ECG analysis program. The ECG analysis program
is only a diagnostic aid. It is not intend as a replacement for the judgment of a cardiologist.
A computer analysis program is merely a collection of ECG evaluation criteria created by
physicians. It is not possible for a computer program to correctly judge every unique ECG
waveforms, so sometimes it makes wrong interpretations where a physician could very easily
read and interpret the waveforms. The final decision can only be made by the qualified
physicians. Use this system only as a diagnostic aid, based on proper understanding of its
features and limitations.

For details of how the ECAPS 12B analysis program interprets ECG waveforms, refer to the
ECAPS 12B ECG Interpretation Program Users Guide. This manual contains detailed
information about discrepancies between physicians and ECAPS 12Bs findings.

This manual is shipped with an ECG-9320K cardiograph and available from Nihon Kohden.
We hope this answers your question.

Troubleshooting - General Operation

Problem

1. The power LED light but there is no display or backlight on the LCD screen.

2. The instrument does not operate on AC power.

3. The instrument does not operate on the battery power.

4. No key or switch operation.

5. Only certain electrode lead waveforms are displayed on the screen or noise appears on all

waveforms.

6. No electrode lead waveforms are displayed on the screen or noise appear on all waveform.

7. Vertical and horizontal strips appear on the LCD screen at contrast intervals.

8. No sound.

9. The recorder does not feed the recording paper when the start switch is pressed.

10. The recording paper is fed but there is no printing.

11. The paper mark cannot be detected.

12. The recording paper tracks zigzag or to one side.

Possible cause/Action

1. A1. Faulty connection to the CN012 or CNJ013 connector on the ECG control board.

A2. Faulty inverter board.

A3. Faulty LCD module.

2. A1. Blown F011 or F012 power unit fuse.

A2. Faulty connection to the CN033 or CNJ035 connector on the ECG control board.

A3. Damaged power cord.

A4. Faulty power unit.

A5. Faulty ECG control board.

A6. Damaged membrane key.

3. A1. The battery is not charged.

A2. Blown F015 battery fuse.

A3. Faulty connection to the CNJ033 or CNJ035 connector on the ECG control board or

the CN031 or CNJ051 connector on the power unit.

4. A1. Damaged membrane key.

A2. Faulty connection to the CNJ033 connector on the ECG control board.

A3. Faulty ECG control board.

5. A1. The electrodes or cables connection from the patient to the instrument is not property

connected.

A2. Faulty ECG control board.

6. A1. Electrodes are not attached to the patient.

A2. Faulty ECG control board.

7. A1. Faulty connection to the CNJ013 connector on the ECG control board.

A2. Faulty ECG control board.

A3. Faulty LCD unit.

8. A1. Check the connection to the CNJ032 connector on the ECG control board.

A2. Faulty speaker.

9. A1. Dirty paper mark sensor.

A2. Faulty connection to the CNJ033 or CNJ036 connector on the ECG control board.

A3. Damaged membrane key.

A4. Faulty ECG control board.

A5. Faulty motor.

10. A1. The thermal head is incorrectly positioned.

A2. Faulty connection to the CNJ011 connector on the ECG control board or the CN031

connector on the power unit.

A3. Faulty thermal head.

A4. Faulty power unit.

A5. Faulty ECG control board.

11. A1. Dirty paper mark sensor.

A2. Faulty connection to the CNJ036 connector on the ECG control board.

A3. Faulty ECG control board.

A4. Faulty paper mark sensor board.

12. A1. Dirty thermal head.

A2. The recording paper is incorrectly positioned.

A3. Inaccurate or worn out platen roller.

Maintenance Information

No. Product Problem

MI-0103R ECG-9130K/P, ECG-9132K Recorder
MI-0106 ECG-9320A/KG, ECG-9522A/P Battery
MI-0119 ECG-9130K/P, ECG-9132K Battery charging circuit