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Innomed Medical Heart Screen 60 G, Service Manual, Page: 9 / 84

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Innomed Medical Heart Screen 60 G Service Manual Download Page 9

Innomed Medical 

Heart Screen 60G-80G-L 

Service manual 

2014.01.09 9/84 

D-5450-1-B_HS60G80GL_SM_ENG.doc 

5 Devices’ 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 

J8 

Head 

J7 

Motor 

ON/OFF  

switch

S17 

HS60G or 

HS80G-L 

Keyboard

S17 

320x240 

or 

128x64

J4 

S1 

J2 

HS60G or HS80G-L type device top  

Summary of Contents for Heart Screen 60 G

Page 1: ...vice 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 ...

Page 2: ...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...

Page 3: ...minations 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 c...

Page 4: ... plus analysis and diagnosis program and rhythm analysis program 3 The 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...

Page 5: ...5 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 b...

Page 6: ...lysis 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...

Page 7: ...requency 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 8 mVpp 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 ...

Page 8: ...per 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...

Page 9: ...gram 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 J8 Head J7 Motor ON OFF switch S17 HS60G or HS80G L Keyboard S17 320x240 or 128x64 J4 S1 J2 HS60G or HS80G L type device top ...

Page 10: ...ing 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 s...

Page 11: ... 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 ...

Page 12: ... switching power supply with U44 ensures the voltage for the digital circuits A separate 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 real...

Page 13: ...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 ot...

Page 14: ... 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 ...

Page 15: ...ccepting 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 f...

Page 16: ...ed 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 ...

Page 17: ...ontains 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 f...

Page 18: ...t Screen 60G 80G L Service manual 2014 01 09 18 84 D 5450 1 B_HS60G80GL_SM_ENG doc 5 7 Devices mechanical construction 5 7 1 Devices summarized exploded diagrams Connection s label Device top Paper holder cover Device base ...

Page 19: ...Screen 60G 80G L Service manual 2014 01 09 19 84 D 5450 1 B_HS60G80GL_SM_ENG doc 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 ...

Page 20: ...l 2014 01 09 20 84 D 5450 1 B_HS60G80GL_SM_ENG doc 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 ...

Page 21: ...al 2014 01 09 21 84 D 5450 1 B_HS60G80GL_SM_ENG doc 5 7 4 HeartScreen 80G L top exploded diagram Keyboard Device Top Display On Off foil On Off switch HS80G L Interface Board HS80G L Paper Holder Printer head Display fastening spacers Paper cover opener ...

Page 22: ...x 1A 2 Set the accu pack substituting power supply to 12 8V and turn charging on Measure the battery and the charger current on J4 1 and J1 1 3 5 min 650mA max 1A 6 1 4 Charging at low temperatures Connect 2 7 kOhm resistance to the accu pack connection pins J4 2 4 and turn charging on Measure the battery and the charger current on J4 1 and J1 1 3 5 max 75mA max 75mA 6 1 5 Charging at high tempera...

Page 23: ...essed JP1 2 battery 7V 0 1V Lower the battery voltage to 7V and turn the device off then back on The device must turn on JP1 2 battery 6 8V 0 1V Gradually decrease the powered on device s battery voltage the device must turn off at 6 8V 0 05V Note The last two measurements must be performed either without software or by grounding the RESET signal J11 3 6 3 Checking voltages SIO Turn on the device ...

Page 24: ...nt cable and short all the electrodes Set the device to maximum sensitivity x2 and 25 mm sec speed Start continuous monitoring and give a BLOCK command Step the lead selector over the I II V2 V6 leads and measure the zero line Find the channels with the greatest positive and negative offsets The measured offsets are DCmax and DCmax Using the P20 potential meter set the offset so the DCmax DCmax 0 ...

Page 25: ...5 all other V5 V6 all other V6 b In case of DC 320 mV The signal s amplitude on the measured lead should be 16000RV 320RV 2 P1 P2 Measured lead L all other I R all other II V1 all other V1 V2 all other V2 V3 all other V3 V4 all other V4 V5 all other V5 V6 all other V6 c In case of DC 320 mV The signal s amplitude on the measured lead should be 16000RV 320RV 2 P1 P2 Measured lead L all other I R al...

Page 26: ... other V5 N all other V6 6 5 4 Checking blocking For the measurement connect the patient cable and short all the electrodes with the exception of the R lead Apply 320 mV DC voltage between the R lead and the other leads Set the device to highest 0 5mV cm sensitivity x2 and 25 mm sec speed Monitor all the channels one by one during continuous monitoring During monitoring give a blocking command Aft...

Page 27: ... DC should be 320 320 mV Set the device to single sensitivity x1 and 5 mm sec speed Filter is off Connect the patient cable according to the following tables start the individual channels with the channel selector and measure the signal amplitude The time constant should be at least 3 2sec a In case of DC 320 mV P1 P2 Measured lead L all other I R all other II V1 all other V1 V2 all other V2 V3 al...

Page 28: ...anged to 510K or 1M may be enough in parallel The PACE detector operation must be checked on all leads with both positive and negative PACE polarity If the detector does not signal the R90 94 or R88 95 resistance pairs can be used to slightly set the comparison level If more serious modification is required the level may be decreased with resistors for example 47K connected in parallel with R11 12...

Page 29: ...the patient cable according to the following table and start monitoring the individual channels one by one On the monitor check the measurement order quality and the baseline which can be reset with the blocking command after the DC regulation During measurement the latch up watch circuit s operation has to be checked with the oscilloscope connected to the test connection s PACE output The PACE ou...

Page 30: ...ominal value Comment Main Board J4 2 1 2 5 A fluctuating Current from the battery 6 6 3 Checking ECG signal When measuring with the Phantom 320 simulator first the generator amplitudes must be defined with analysis with a certified device as a reference measurement During the measurement series compare to the reference At this point of the checks the analysis QRS cycle s highest positive or negati...

Page 31: ...rinting 7 3 1 With printer partially connected 1 Connect a 4700uF capacitor in parallel with the power supply 9V max current limit substituting the battery 2 Connect only the printer motor connection and load the paper Connect a short on the ECG input Test procedure Comment Burn impulse test Start from the test menu HS80G L or with the REC button HS60G Max 5ms burn time measure at J1 1 on the Inte...

Page 32: ...n the test menu RTC clock test Set the exact date and time which has to be the same after turning the card off and on again Contrast test The LCD contrast is acceptable not foggy the LCD is operational Burn impulse test Start from the test menu Max 5ms burn time measured at J11 8 Active signal at high level Serial data transfer test ECG signal monitoring with Innobase for Windows program and gener...

Page 33: ...monitoring with Innobase for Windows program and generator Low Batt check Gradually decrease battery voltage and with it the ONPOWER voltage level the processor checks this every second at 8 4 0 1V a symbol appears in the bottom right corner ONPOWER J11 9 Checking power off Continue to decrease the battery voltage the processor checks this every second the device turns off at 7 2 0 1V ONPOWER J11 ...

Page 34: ...rging adapter connection and the patient connection 10 Between the charging adapter connection and the SIO connection 10 8 3 2 Sensitivity examination and DC tolerance checking Apply DC signal according to the table from a ground independent generator to the amplifier s input 2 mVpp 10Hz sine DC must be 320 320 mV Set amplifier sensitivity to 1 and monitor the lead groups Start on line printing wi...

Page 35: ... other V3 V4 all other V4 V5 all other V5 V6 all other V6 8 3 4 Measuring noise on the input and baseline checking Make a 10 seconds long recording with the shorted inputs at 2 sensitivity 25 mm sec speed from all groups The filter must be off Short the device input Measure the noise and absolute deviation from the baseline on the null line The noise on the input is acceptable if the value of the ...

Page 36: ...P2 Examined lead Measured amplitude L all other I R all other II V1 all other V1 V2 all other V2 V3 all other V3 V4 all other V4 V5 all other V5 V6 all other V6 8 3 7 Checking filter a Line filter on at 50Hz Apply 4 mVpp 50Hz sine signal from the generator between the device s V2 and all other connected inputs The filter is acceptable if the dampening is less than 20dB when the frequency is change...

Page 37: ...ll groups at 25 mm sec speed and 1 amplification Check the printout quality The curve must be continuous and clearly visible The recording must be repeated in normal heart rate 60 position by connecting the pace generator set to 700mV 2ms in series with the R lead Make 6 seconds long recording in automatic operating mode 8 3 10 Checking PC connection Connect an ECG signal generator to the device i...

Page 38: ...ice procedures 9 1 Device disassembly re assembly The device has to be disassembled in the following order re assembly must be performed in reverse order 1 Remove the self adhesive connection label from the back make sure that the label is not damaged as it can be replaced after re assembly 2 Turn the device upside down and remove the five screws during re assembly take care to note the different ...

Page 39: ... Turn the device right side up again and carefully lift the device top during re assembly take care that the cables going from the battery pack to the Main Board are not caught between the screw stubs connecting the top and bottom part 4 Disconnect the keyboard and display connections 5 Lift the top part ...

Page 40: ... removing the indicated screws the HS80G L Main Board can be removed 4 The connecting cable of the insulating shielding plate fixed to the tray is fixed with the top left card fixing screw as indicated on the diagram When re assembling make sure this cable is properly fixed 5 The shielding fixed to the tray is glued from the bottom and if removed should be glued back Card fixing screws Amplifier i...

Page 41: ...pting the printer head cables 2 Remove the Interface Board holding screws and remove it from the device during re assembly note the LCD position tilt etc 3 To remove the LCD disconnect the connection accepting the foil cable from the LCD 4 Remove the LCD from the Interface Board by unscrewing the three spacer fixed screws 5 After removing the LCD the keyboard can be pushed out from the device s to...

Page 42: ...an be removed regardless of the LCD but first disconnect the printer head cables on the Interface Board 7 Now unscrew the screws according to the diagram and the paper bin can be removed from the device s top part during re assembly take care of proper door position Interface board fixing screws Paper holder cover opener ...

Page 43: ...e printer head cables 2 Remove the Interface Board holding screws and remove it from the device during re assembly note the LCD position tilt etc 3 To remove the LCD the LCD has to be unsoldered from the pins connecting it to the Interface Board 4 Remove the LCD from the Interface Board by unscrewing the two spacer fixed screws 5 After removing the LCD the keyboard can be pushed out from the devic...

Page 44: ...doc 6 The paper bin can only be removed after removing the LCD by unscrewing the screw indicated on the diagram Remove the paper bin from the device s top part during re assembly take care of proper door position Paper holder fixing screws after removing the Interface Board Paper holder cover opener ...

Page 45: ...d it 2 1 The device is turned off the serial cable is connected 2 2 Place the magnet tight against the device s back next to the charging adapter connection and turn the device on If the reed tube switched nothing is visible on the display after it has been turned on The device is in programming mode Remove the magnet and turning the device off and on again starts the device in normal mode 2 3 If ...

Page 46: ...oard is damaged The charging circuit is damaged Check the charging adapter cable and connection Check keyboard connection Check the CHARGE LED on the keyboard Check the charging circuit The device turns off immediately after turned on The battery has discharged The charging circuit is damaged Recharge the battery If this occurs after recharging check the charging adapter and the charging circuit a...

Page 47: ... cables and the connections Check the soldering on the digital part of the Main Board Resolder the IC s with the exception of the processor If it cannot be repaired replace the card The keys or at least some keys are not operational The cables are not connected or are damaged The keyboard card or the Main Board or Interface Board is damaged Check the cables and connections Check the keys according...

Page 48: ...e isolation is broken Replace the patient cable Several ECG channels are noisy The environment noise is too great the mains ground protection conductor is damaged or the amplifier is generating Check the environment for electromagnetic noise Check the mains ground protection conductor continuity to the device charging adapter connection input point Check and repair the amplifier card according to ...

Page 49: ...ct position Parts of the printed picture are faded The rubber roll does not tighten evenly on the burning head problem with paper quality or burning voltage Check paper quality and the burning voltage HEAD_POWER and burning time In case of printer head problem replace it The foil has come up on the keyboard or the power switch Gluing has become loose Replace the keyboard or the foil The circuit bo...

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Page 54: ...Innomed Medical Heart Screen 60G 80G L Service manual 2014 01 09 54 84 D 5450 1 B_HS60G80GL_SM_ENG doc 12 Schematics 12 1 HS80G L Main Board ...

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Page 68: ...Innomed Medical Heart Screen 60G 80G L Service manual 2014 01 09 68 84 D 5450 1 B_HS60G80GL_SM_ENG doc 12 5 HS 60G and HS 80G L main board E version Schematics D 1127 1 E Board R 3350 5 TOP ...

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