Innomed Medical Heart Screen 60 G User manual

Innomed Medical Heart Screen 60G-80G-L Service manual
2014.01.09 1/84 D-5450-1-B_HS60G80GL_SM_ENG.doc
Service Manual
for
Heart Screen 80 G-L
and
HeartScreen 60G
Simultaneous 12-channel ECG devices with 58 / 80mm
wide 1- / 3-channel built-in printer and
LCD display
Document Number:
D
-
5450
-
1
-
B

Innomed Medical Heart Screen 60G-80G-L Service manual
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1Contents
1CONTENTS .................................................................................................................................................. 2
2THE HEARTSCREEN 80G-L .................................................................................................................... 4
3THE HEARTSCREEN 60G ........................................................................................................................ 4
4DEVICES’ TECHNICAL PARAMETERS ............................................................................................... 5
4.1 GENERAL................................................................................................................................................ 5
4.2 MAINS AND POWER SUPPLY .................................................................................................................... 5
4.3 SAFETY................................................................................................................................................... 5
4.4 HEARTSCREEN 80G-L OPERATING MODES ............................................................................................. 6
4.5 HEARTSCREEN 80G-L LEAD GROUPS...................................................................................................... 6
4.6 HEARTSCREEN 60G OPERATING MODES ................................................................................................. 7
4.7 HEARTSCREEN 60G LEAD GROUPS ......................................................................................................... 7
4.8 ECG AMPLIFIER...................................................................................................................................... 7
4.9 DIGITIZING PROPERTIES .......................................................................................................................... 7
4.10 HEARTSCREEN 80G-L PRINTING AND DISPLAY PROPERTIES ................................................................... 8
4.11 HEARTSCREEN 60G PRINTING AND DISPLAY PROPERTIES ....................................................................... 8
4.12 SIO PARAMETERS ................................................................................................................................... 8
4.13 MECHANICAL DATA (INFORMATIVE) ...................................................................................................... 8
4.14 PACEMAKER PULSE DETECTION .............................................................................................................. 8
4.15 CHECKING ELECTRODE AND AMPLIFIER OPERATION ............................................................................... 8
5DEVICES’ COMPONENTS AND THEIR OPERATION ....................................................................... 9
5.1 DEVICES’BLOCK DIAGRAM OF COMPLETE CONFIGURATION: .................................................................. 9
5.2 HS80G-L MAIN BOARD ECG AMPLIFIER UNIT ..................................................................................... 10
5.2.1 Main functions as grouped by the connection diagram:.................................................................. 10
5.2.2 EKG amplifier unit block diagram:................................................................................................. 11
5.3 HS80G-L MAIN BOARD DIGITAL PART ................................................................................................. 12
5.3.1 Main functions according to the connection diagram:.................................................................... 12
5.3.2 HeartScreen 80G-L Main board versions ....................................................................................... 13
5.3.3 Digital part block diagram:............................................................................................................. 14
5.4 HS60G AND HS80G-L INTERFACE BOARD .......................................................................................... 15
5.4.1 Main functions based on circuit diagram sides............................................................................... 15
5.4.2 Interface board block diagram ........................................................................................................ 16
5.4.3 HS60G and HS80G-L Interface board versions .............................................................................. 16
5.5 KEYBOARD ........................................................................................................................................... 17
5.6 BATTERY PACK..................................................................................................................................... 17
5.7 DEVICES’MECHANICAL CONSTRUCTION............................................................................................... 18
5.7.1 Devices’ summarized exploded diagrams........................................................................................ 18
5.7.2 Devices’ base exploded diagram ..................................................................................................... 19
5.7.3 HeartScreen 60G’s top exploded diagram ...................................................................................... 20
5.7.4 HeartScreen 80G-L top exploded diagram...................................................................................... 21
6CARD LEVEL MEASUREMENTS – MAIN BOARD........................................................................... 22
6.1 CHECKING ACCU PACK CHARGING ........................................................................................................ 22
6.1.1 Basic settings ................................................................................................................................... 22
6.1.2 Charging at low battery voltage...................................................................................................... 22
6.1.3 Normal charging ............................................................................................................................. 22
6.1.4 Charging at low temperatures......................................................................................................... 22
6.1.5 Charging at high temperatures........................................................................................................ 22
6.1.6 Charging at high battery voltage..................................................................................................... 22
6.1.7 Current consumption when turned off ............................................................................................. 22
6.2 CHECKING VOLTAGES –DIGITAL CIRCUITS ........................................................................................... 23
6.3 CHECKING VOLTAGES –SIO................................................................................................................. 23
6.4 CHECKING VOLTAGES –ECG SIDE ....................................................................................................... 24
6.5 ECG PART TEST .................................................................................................................................... 24
6.5.1 Offset measurement ......................................................................................................................... 24
6.5.2 Amplification setting and DC tolerance measurement .................................................................... 24

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6.5.3 CMRR check .................................................................................................................................... 26
6.5.4 Checking blocking ........................................................................................................................... 26
6.5.5 Checking frequency characteristic .................................................................................................. 26
6.5.6 Checking time-constant ................................................................................................................... 27
6.5.7 Checking pacemaker detector.......................................................................................................... 28
6.5.8 Checking PACE tolerance ............................................................................................................... 28
6.5.9 Checking amplifier latch-up watcher .............................................................................................. 29
6.5.10 Noise measurement and baseline checking................................................................................. 29
6.6 CHECKING PRINTING............................................................................................................................. 30
6.6.1 With printer partially connected...................................................................................................... 30
6.6.2 Print test with printer ...................................................................................................................... 30
6.6.3 Checking ECG signal ...................................................................................................................... 30
6.7 POWER CONSUMPTION MEASUREMENT ................................................................................................. 30
7CARD LEVEL MEASUREMENTS – 60G&80G-L INTERFACE BOARDS..................................... 31
7.1 CHECKING VOLTAGES........................................................................................................................... 31
7.2 CHECKING BASIC FUNCTIONS................................................................................................................ 31
7.3 CHECKING PRINTING............................................................................................................................. 31
7.3.1 With printer partially connected...................................................................................................... 31
7.3.2 Print test with printer ...................................................................................................................... 31
8DEVICE LEVEL MEASUREMENTS ..................................................................................................... 32
8.1 HEARTSCREEN 80G-L BASIC FUNCTIONS............................................................................................. 32
8.2 HEARTSCREEN 60G BASIC FUNCTIONS................................................................................................. 33
8.3 CHECKING TECHNICAL REQUIREMENTS ................................................................................................ 33
8.3.1 Safety examinations ......................................................................................................................... 33
8.3.1.1 Insulation checking..................................................................................................................................33
8.3.1.2 Leakage current measurement .................................................................................................................34
8.3.2 Sensitivity examination and DC tolerance checking ....................................................................... 34
8.3.3 Latch-up watcher check................................................................................................................... 35
8.3.4 Measuring noise on the input and baseline checking ...................................................................... 35
8.3.5 Checking time-constant ................................................................................................................... 35
8.3.6 Checking frequency transfer............................................................................................................ 36
8.3.7 Checking filter ................................................................................................................................. 36
8.3.8 Checking CMRR .............................................................................................................................. 37
8.3.9 Printing ECG signal ........................................................................................................................ 37
8.3.10 Checking PC connection ............................................................................................................. 37
8.3.11 Measuring power consumption ................................................................................................... 37
9MAINTENANCE AND SERVICE PROCEDURES ............................................................................... 38
9.1 DEVICE DISASSEMBLY /RE-ASSEMBLY ................................................................................................. 38
9.1.1 Further disassembly of the bottom part: ......................................................................................... 40
9.1.2 Further disassembly of the top part – HeartScreen 80G-L: ............................................................ 41
9.1.3 Further disassembly of the top part – HeartScreen 60G:................................................................ 43
9.2 REPROGRAMMING THE DEVICE ............................................................................................................. 45
10 POSSIBLE ERRORS AND TROUBLESHOOTING ......................................................................... 46
11 ASSEMBLY DRAWINGS..................................................................................................................... 50
11.1 MAIN BOARD ........................................................................................................................................ 50
11.2 HS80G-L INTERFACE BOARD............................................................................................................... 52
11.3 HS60G INTERFACE BOARD .................................................................................................................. 53
12 SCHEMATICS ....................................................................................................................................... 54
12.1 HS80G-L MAIN BOARD ....................................................................................................................... 54
12.2 HS80G-L INTERFACE BOARD............................................................................................................... 63
12.3 HS60G INTERFACE BOARD .................................................................................................................. 65
12.4 ACCU PACK........................................................................................................................................... 67
12.5 HS 60G AND HS 80G-L MAIN BOARD EVERSION................................................................................. 68
12.6 HS 60G INTERFACE BOARD BVERSION ................................................................................................ 79
12.7 HS 80G-L INTERFACE BOARD DVERSION ............................................................................................ 82

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2The HeartScreen 80G-L
The HeartScreen 80G-L is a battery-operated, modern 12-channel electrocardiograph, used to measure and
graphically record the heart’s bioelectric potential during human heart and circulatory system examination. The
device contains a 12-channel amplifier and ECG signal-processing unit. The built-in printer is 3-channel. The
high-speed 12-channel data transfer over the serial line insures 12-channel on-line display on the PC.
Operation of the device is simple, selecting the basic functions and the pre-edited record modes, and creating and
storing the records need but a few button presses.
Even in its basic configuration the device can be connected to a computer. On-line display of the selected 12
channels and record storage is possible on the PC’s large display. The records stored in the HeartScreen 80G-L
are identified by the date and exact time, and also by the automatically generated identification code or manually
entered patient code.
The PC-based cardiological database management system (Innobase for Windows) running under Windows
performs archiving. The program may also be used for on-line ECG monitoring, ECG and diagnosis storage,
search and display. The program system is capable of receiving signals from other Innomed manufactured ECG
devices and record storage.
The HeartScreen 80G-L is available with the following services and configurations:
•A: storage, 3-channel recording in manual or automatic mode, 12-channel record storage, built-in clock
and battery pack.
•B: All the features of version “A”, plus analysis and diagnosis program.
•C: All the features of version “A”, plus analysis and diagnosis program, and rhythm analysis program.
3The HeartScreen 60G
The HeartScreen 60G is a battery-operated, modern 12-channel electrocardiograph, used to measure and
graphically record the heart’s bioelectric potential during human heart and circulatory system examination. The
device contains a 12-channel amplifier and ECG signal-processing unit. The built-in printer is 3-channel. The
high-speed 3-channel data transfer over the serial line insures 3-channel on-line display on the PC.
Operation of the device is simple, selecting the basic functions and the pre-edited record modes, and creating and
storing the records need but a few button presses. Dedicated buttons control the main functions and the device
indicates the settings in the bottom row of the display.
Even in its basic configuration the device can be connected to a computer. On-line display of the selected 3
channels and record storage is possible on the PC’s large display. Besides the exact time and date, the patient
identification code identifies the records stored in the HeartScreen 60G.
The PC-based cardiological database management system (Innobase for Windows) running under Windows
performs archiving. The program may also be used for on-line ECG monitoring, ECG and diagnosis storage,
search and display. The program system is capable of receiving signals from other Innomed manufactured ECG
devices and record storage.
The HeartScreen 60G is available with the following services and configurations:
•Basic version: 3-channel recording in manual or automatic mode, 12-channel record storage, built-in
clock and battery pack.
•Extended version: All the features of the basic version, plus built-in analysis program.
Devices manufactured and distributed by:
Innomed Medical
Medical Developing and Manufacturing Inc.
H-1146 Budapest, Szabó József u. 12.
(36-1)460-9200 Fax [phone]
E-mail: [e-mail]
www.innomed.hu

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4Devices’ technical parameters
Classification according to 93/42/EEC directives: 2a
Applied standards: IEC 601-2-25 functional
AAMI EC11 functional
IEC 62D functional
IEC 601-1 safety
EN 60601-1-2 EMC
IEC 61000-4 EMC
IEC 68-2-6 mechanical vibration
IEC 68-2-29 mechanical shock
93/42/EEC medical directive
4.1 General
Reference temperature range 0... +40 °C
Operating temperature range 0... +45 °C
20… 95% humidity
(without condensation)
Shipping / storage temperature range -20 ... +55 °C
Operating area dry, confined place
4.2 Mains and power supply
Mains voltage 100-240V
Mains frequency 50 / 60 Hz
Current consumption 0.3 – 0.6A
Rechargeable battery type 8 * type HR-AAU (1500mAh NiMH) cells
(SANYO) or compatible
Rechargeble battery nominal voltage 9.6V
Rechargeble battery charging current (informative) 1.3A
Rechargeble battery charger type, protection Intelligent quick charger, heat-protection
at 54°C, thermal fuse at 72°C
Operating time from battery 30 minute periodic ECG curve printing or
4hours monitoring
(only basic functions operational)
4.3 Safety
Safety class I.
Patient protection (with PC connection, too) CF

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4.4 HeartScreen 80G-L operating modes
Monitoring 3-channel ECG monitoring on the LCD from any lead, including
SPEC group as well, plus 1 rhythm channel.
Within this:
Manual printing Manual recording from any lead group on 3 channels, including
SPEC group.
Automatic printing Adjustable print length from the 12 standard ECG leads in 4x3
channel groups.
Record storage
(STORE)
Automatic recording and storage from all groups, including SPEC
group.
Rhythm curve may also be stored in pre-programmed mode, on
which the device performs rhythm analysis as well.
Diagnosis creation
(DIAG)
Automatic 12-channel recording with analysis and diagnosis. Raw
curve, rhythm curve and SPEC group may also be stored in pre-
programmed mode.
Rhythm analysis
creation
(ARTM)
Rhythm analysis creation with statistics from the lead-group for the
selected lead.
Using the menus Handling records stored in the device and settings.
Within this:
Catalog
(Menu / Catalog)
Used to handle stored records and related data.
Settings
(Menu / Settings)
Used to set basic device settings.
Identifier
(Menu / Identifier)
Used to enter numerical patient identifier.
4.5 HeartScreen 80G-L lead groups
Standard 3 channel: I-III, aVR-aVF, V1-V3, V4-V6
Cabrera 3-channel: aVL, I, aVR; II, aVF, III; V1-V3; V4-V6
SPEC lead group first
second
third
any lead from the standard 12
any lead from the standard 12
any lead from the standard 12
Alead may only appear once in the spec group. Leads part of the standard groups appear normally on the
display, while leads part of the SPEC lead group appear in inverse.

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4.6 HeartScreen 60G operating modes
Monitoring 1-channel ECG monitoring on the LCD from any lead.
Within this:
Manual printing Manual recording from any lead group on 3 channels.
Automatic printing Adjustable print length from the 12 standard ECG leads in 4x3
channel groups.
Record storage
(STO)
Automatic recording and storage from all groups.
Rhythm curve storage
(RTM)
1-channel rhythm curve storage.
Analysis creation
(ANL)
12-channel average QRS creation, numerical data table creation, 16s
rhythm curve storage from 1 channel.
Using the menus Handling records stored in the device and settings.
Within this:
Catalog
(Menu / Catalog)
Used to handle stored records and related data.
Settings
(Menu / Settings)
Used to set basic device settings.
Alarm
(Menu / Alarm)
Used to set an alarm for when heart frequency upper and lower limit
values are reached.
Identifier
(Menu / Identifier)
Used to enter patient identifier code.
4.7 HeartScreen 60G lead groups
Standard or Cabrera Standard leads.
The required lead mode may be set in the SETUP menu.
4.8 ECG amplifier
Input signal range ±8mVpp
Frequency run 0.05 Hz…150 Hz +0,-3 dB
Voltage measurement relative error
0.5 - 10 mV ±3 %
Sensitivity 2.5, 5, 10, 20 mm/mV
Noise on the input max. 20µVpp
Input impedance (informative) min. 20 MOhm
Max. signal change speed min. 4 mV/10ms
CMRR min. 100 dB
DC tolerance min. ±320 mV DC
Pacemaker tolerance max. 700mV/2ms
Pacemaker detection min. 2mV/0.5ms max.700mV/2ms
Time constant min. 3.2 sec
Patient leakage current max. 10 µA
Blocking automatic and manual
Calibrating signal 1mV / 300ms
Muscle filter (digital) 35Hz +0/-3 dB
Mains filter (digital) 50 / 60 Hz digital
Mains filter - 20 dB point 50 Hz filter: 48.5 … 51.5 Hz
60 Hz filter: 59 … 61 Hz
Baseline filter (digital) below 0.3Hz: complete repression
over 0.3Hz: complete pass through
Defibrillator tolerance
Only with defibrillator protected cable!
max. 360J, 5000V
4.9 Digitizing properties

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Data acquisition 12 leads, simultaneous
Sampling frequency 1000 Hz / channel
A/D resolution 13 bit
Referring to ±10 mV signal range 2.5 µV/bit
Stored signal resolution 500 Hz
10 µV/bit
Serial line resolution during on-line ECG transfer 500 Hz
10 µV/bit
4.10 HeartScreen 80G-L printing and display properties
Effective recording width per channel 40 mm, overlapping allowed
Printer head resolution in amplitude direction: 8 points / mm
on time axis: 8 or 16 points / mm
Paper speed 5, 25,50 mm/s
Max. paper run speed
(in case of 60bpm, informative)
25 mm/s
Paper width 80 mm +0; -1%
Paper roll outer diameter max. 50 mm
Printer lifetime 50,000 m
Paper change automatic change
Display 240 x 320 points
4.11 HeartScreen 60G printing and display properties
Printer head resolution in amplitude direction: 8 points / mm
on time axis: 8 or 16 points / mm
Paper speed 5, 25,50 mm/s
Paper width 58 mm +0; -1%
Paper roll outer diameter max. 50 mm
Printer lifetime 50,000 m
Paper change automatic change
Display 64 x 128 points
4.12 SIO parameters
Serial I/O RS – 232
Serial line services on-line monitoring from the 12 channels
ECG curve archiving on the PC
4.13 Mechanical data (informative)
Size 250 * 150 * 70 mm
Device weight with battery pack and charger 1.3kg
4.14 Pacemaker pulse detection
When the device examines a patient with a pacemaker, it recognizes the pacemaker signal within a set range
according to technical data and displays them graphically on the record. In this case, the device does not create a
diagnosis, since the pacemaker pulse interferes with the diagnosis program.
In this case the device only creates analysis, which the pace impulse does not interfere with, but due
to morphological differences there may be inaccuracies in the numerical data.
4.15 Checking electrode and amplifier operation
If the input side of the amplifier does not work properly or there is cable or electrode problem, the device blocks
automatically and initializes the filters. After blocking the device checks if the error state continues. If so, the
device repeats blocking and filter initialization.
!

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5Devices’ components and their operation
5.1 Devices’ block diagram of complete configuration:
ECG
Amplifier
Accu
Pack
Mains
Charger
J2
J1
J4
PC Connection
P7
ECG
Input
Shielding
Digital
Part
Tesztcsatlakozó
HS80G-L Main Board on Device Base
Interface Board
HS60G or HS80G-L
PL1
J11
58mm or
80 mm
Printer
J8Head
J7Motor
ON/OFF
switch
S17
HS60G or
HS80G-L
Keyboard
S17
320x240
or
128x64
J4
S1
J2
HS60G or HS80G-L type device top

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5.2 HS80G-L Main board ECG amplifier unit
(D-1127B_HS80G-L_Main_Board_Electrical_Sch)
5.2.1 Main functions as grouped by the connection diagram:
1/9. ECG input
This is where the device’s ECG input circuits and the main amplifier levels with some of the error handling
circuits. Further, this is where the multiplexer (U28) selecting the channel for the AD converter is located.
2/9. Overload Circuits
The pace checking and latch-up checking circuit input, signal preparation levels.
3/9. Filter
Contains the filter circuits with the connecting and blocking circuits.
4/9. ECG AD
This is where 13-bit AD converter (AD1), the reference-voltage creating circuit (OP2), the amplifier controller
(U20) and the processor isolating circuits (OP1-OP4-Q2) are located.
The two monostable circuits in U10 perform the combined latch-up / pace signal shape forming.
The two monostable circuits in U23 extract the auxiliary signals which belong to the ECG data pockets (Clock,
Data ready/DMA request).
5/9. Isolated power supply
Contains the isolated switching power supply, which, besides the basic voltage, creates the negative voltage
needed for the LCD contrast.

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5.2.2 EKG amplifier unit block diagram:
L
F
R
CH1
CH2
V1-V6
L
V1
N
F,L,R
C
V6
Active „N”
point loop Latch-up check and
pace detection
ECG
input
MPX
8/1
A/D
convert
PIC
uController
Reference
circuit
Isolating
power
supply
Opto-
connections
Signal shape
generating
circuits
MPX addr.
To digital part
P7
Block on/off
Data out
Shielding
Isolating strip

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5.3 HS80G-L Main board digital part
(D1127B_HS80G-L_Main_Board_Electrical_Sch)
5.3.1 Main functions according to the connection diagram:
6/9. Processor
Among other things it contains the microprocessor (U24)
•the 512kByte external RAM (U29),
•the calendar IC (U21 RTC),
•and the serial digitized ECG signal receiveing readable 2 8-bit registers (U37 and U39) (APM Input Register).
All these connect to the common 8-bit data and 19-bit address bus.
Located here as well:
•Test connection (J3) (see below board version descriptions)
•Interface Board connection receptacle (J2) (see below board version descriptions)
•Reset signal generating circuit
•Programming mode switching circuit part (with the Reed tube)
7/9. Power Supply
The most important of these circuit blocks is the U52D-U51A-T2 trio, turning the device on and off.
Beside them is the U92 bus switch, which controls the speaker and the automatis shut-off feature.
This is where the circuit creating the reference voltage required by the device’s dgitial circuit parts (U43A).
The switching power supply with U44 ensures the voltage for the digital circuits.
Aseparate circuit is there to supply the RAM for stored records and the clock-IC with power when the device is shut
down, by draining the battery.
The largest circuit block on this side is the circuit ensuring PC serial transfer. The main parts of the circuit are the
safety power supply (U86-TR2) and the opto-connectors realizing two-way connection (U80-81). The power supply
automatically turns on and off to serial line signal from the PC, can be switched from the device with one of the
processor output ports.
8/9. Charging circuit
Found here are:
•The charge control circuit (U11), which enables or disables quick charge based on battery pack voltage and
temperature. The processor can also enable / reset quick charge with the CHRG RESET signal.
•The drip charge performing continuous operation resistance (R185).
•The switching power supply ensuring the 1.25A current required for quick charge.
Connections on the board:
•+15V input (J1) with protection and EMC filtering.
•Battery connection (J4) with protection fuse.
9/9. Printer interface
The bytes providing the pixels to be burnt arrive on the printer head in serial originating from the U46, while their
clock signals originate from the U45 IC. The U46 IC connects directly to the processor bus.

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5.3.2 HeartScreen 80G-L Main board versions
There are two versions of the HeartScreen 80G-L Main board.
Important!
If you order the HS80G-L Main board as service part, make sure you order the same type!
One of the main differences is the design of the 50-pin ribbon cable ensuring the connection with the Interface Board:
•One is a standard 1.27mm division width, conventional hole-mounted design (the HS80G-L Main Board
identifier A-1032-2).
•The other contains a double density, 0.635mm division width ribbon cable assembled with SMD connectors
(the HS80G-L Main Board identifier R-1924-0).
It is also important that the transmitted signal order on the cables is different. The following schematic parts indicate
the two cables’ signal line orders:
A-1032-2: R-1924-0:
The other main difference is the test connection placement and design. The two designs and placements according to
HS80G-L Main Board identifiers are:
A-1032-2: R-1924-0:
The connection and schematic diagrams referenced in the service documents are for the R-1924-0 board.

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5.3.3 Digital part block diagram:
Pro-
cesszor
(U1)
RAM
(U29)
D[0..7]
A[00..18]
PL1
J2
PC
Connection
LCD,
Keyboard.,
Printer.,
On/off
SIO
Insulation
Interface
Circuits
ECG data
RTC
(U7)
Mains
Charger
Accu
Pack
Charger
Circuit
RTC & RAM
Power
Supply
+5V Power
Supply
On/Off
Circuit
Reset
Circuit
Programming
Voltage
J4
J1
Serial ECG
data
ECG Block
Signal
Test
Connector J11

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5.4 HS60G and HS80G-L Interface Board
(D1133B_HS80G-L_Interface_Board_Electrical_Sch.pdf and
D1912A_HS60G_IF_Board_Electrical_Sch.pdf)
5.4.1 Main functions based on circuit diagram sides
1/2. LCD & Keyboard interface
The on-board circuits’ tasks:
•Accepting connection from the LCD, backlight on/off
In case of HS60G the connection is different due to different LCD design.
Furthermore we have provided the opportunity to build in a contrast voltage generating circuit. This is only
required for certain LCD’s.
•Accepting the 50-pole connection between the Interface and the Main Board.
•Accepting lines from the on/off button.
•The keyboard interface circuit and connection.
The number of buttons is different for the two devices, but the connections and their environments are the same.
2/2. Printers
The on-board circuits’ tasks are:
•The controlled power supply (IRF4905, U43A, OP3) insuring power for the printer directly from the battery is
found on this side.
•The burn controller, burn-time controlling circuit (U44B) and the printer head power on/off switching power
supply (U44A) is also found here.
•The motor driving IC (U41), controlled directly by the processor.
•The HS80G-L is shipped with the 80mm LTPV345 head, its connections are found here (J7-8).
In case of the HS60G the connection is different for the 58mm LPTH245 printer head.

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5.4.2 Interface board block diagram
The HS60G Interface board and the HS80G-L Interface board block diagram are similar, but besides the mechanical
constructions certain blocks may be different according to the previous sections.
5.4.3 HS60G and HS80G-L Interface board versions
Similar to the HS80G-L Main board, there are two versions of the HS60G and HS80G-L Interface boards.
The difference is the design of the 50-pin ribbon cable connecting to the Main board:
•One is a standard 1.27mm division width, conventional hole-mounted design.
Identifier in case of HS60G: HS60G Interface Board Interface Board PCB 020.
Identifier in case of HS80G-L: A-1036-1, and the related HS80G-L Main board identifier is A-1032-2.
•The newer board contains a double density, 0.635mm division width ribbon cable assembled with SMD
connectors.
Identifier in case of HS60G: R-1807-0.
Identifier in case of HS80G-L: R-1992-0, and the related HS80G-L Main board identifier is R-1924-0.
Important!
If you order the HS80G-L Main board as service part, make sure you order the same type!
The connection and schematic diagrams referenced in the service documents are for the newest boards, R-1992-0 and
R-1807-0.
J7
J8
Keyboard
Motor
Driver
Burn
Controll
LCD
Contrast
Voltage
Circuit
Printer
Power
Supply
J4
S17
Printer
Keyboard
Interface
On/off
switch S1
HS80G-L
Main
Board
J2
Backlight
Controll
LCD

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5.5 Keyboard
(R-1059C_HS80G-L_Revised_Keyboard_sch and
R-1910A_HS60_Revised_Keyboard_sch)
Indicates the device membrane keyboard connection diagram with the device power button and the LCD connection.
5.6 Battery pack
(R-1047C_HS80G-L_Assembled_Accupack.pdf)
The battery pack contains 8 pcs of 1500 mAh rechargeable batteries. The pack is drained at the fourth cell. This output
supplies the date / time IC and the record storing RAM with power when the device is turned off.
We have built a thermistor into the battery pack as well, which checks battery pack heating during charging. As a final
check we have built in a thermal protection fuse that breaks at 72°C. Take note of this fuse when servicing the device,
as it may break with too much heat (for example when soldering). Instead of soldering we recommend cold extrusion
or soldering with continuous cooling.

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5.7 Devices’ mechanical construction
5.7.1 Devices’ summarized exploded diagrams
Connection’s label
Device top
Paper holder cover
Device base

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5.7.2 Devices’ base exploded diagram
HS80G-L Main Board
Accu pack
fastener
Accu Pack
Device base
Insulating-Shielding Plate
(Glued to device base)

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5.7.3 HeartScreen 60G’s top exploded diagram
Keyboard
Device top
Display
On/Off foil
On/Off switch
HS60G Interface Board
HS60G Paper Holder
HS60G Printer head
Display fastening spacers
Paper cover opener