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JE-912AK PSG Input Box

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1. 4 SpO connector 5 USB cable 6 Cord hanger Service Manual JE 912AK 1 13 1 GENERAL Left side panel Name 1 DC input connector 2 REMOTE MARK connector Bottom panel Multiple connecter Connects to the JE 914A Mini Junction Box To open the multiple connecter cover pry the cover off with a flat blade screwdriver CAUTION Only connect the JE 914A Mini Junction Box When another type of mini junction box is connected the PSG input box will malfunction 1 14 Service Manual JE 912AK 1 GENERAL JE 914A Mini Junction Box WARNING Connect only the specified instruments to the connectors or socket by following the specified procedure Otherwise electrical leakage current may harm the patient and operator Attach the measurement parameter name label here NOTE Name Either of the following combinations cannot 1 Z jack be used 2 Electrode jack X19 jacks and AIRFLOW connector 3 Extra input jack X20 jacks and CHEST connector 4 BODY POSITION connector X21 jacks and ABDOMEN connector 5 Bipolar derivation jack If either of the above combinations is used 6 Respiration pickup sensor jack the signal from the X19 X20 or X21 jacks is measured Service Manual JE 912AK 1 15 1 GENERAL Composition JE 912AK T UT 0727 PSG INPUT board UT 0728 PSG AMP board UT 0729 PSG MOTHER board JE 914A Mini junction bo
2. 9X9 Suz The digital EEG displays the EEG waveform in each channel by 02 s o X10 X17 subtracting two electrode potentials selected to a montage The X1 o xn k subtracted result will be incorrect if the electrode attachment is not LO o X12 ABDOMEN SES the original EE potential is flat i Ge or artifact is X3 9 8 X13 0 0 superimposed on the original electrode potential Omit the measurement result if the displayed EEG waveform is incorrect X4 X14 Eo st NE BODY POSITION o DC2 JE 914A Mini Junction Box Service Manual JE 912AK V vi This page is intentionally left blank Service Manual JE 912AK Section 1 General MMU CUA SUN ON EDEN 1 1 Service Policy Service Parts and Patient Safety Checks 1 2 SENICE PONCY Legs EA 1 2 SEIMICE POMS a sah d reos eiecti sede i ere dota AL ala a reto uda 1 2 Patient Safety Checks ctun eene de e DOR ELI Ee 1 3 Maintenance Equipment Tools esas eese enn nennen nnne nennen 1 3 General Information on Servicing enne 1 4 General Safety information re hei e Etc And akaqa A e aa qoia eee 1 6 eet IN 1 11 Panel DescriptiOris u uuu uu G A 1 13 JE 912AK PSG Input BOX crederet teet e tat duet east 1 13 JE 914A Mini Junction Dos 1 15 GOMPOSILIOM p T 1 16 Service Manual JE 912AK 1C 1 This page is intentionally left blank 1C 2 Service Man
3. NOTE Before measurement confirm the following The examination room is free from artifact causing sources The electrodes are firmly attached to the patient The electrodes and electrode leads are not dirty damaged or frayed If not pulse noise caused by static electricity or generated by a display may be superimposed on the EEG waveform Refer to Instrument Location in Section 2 of each electroencepahalograph operator s manual Problem Possible cause Action Noise or artifact is superimposed on the waveforms The electrode lead is faulty Check the continuity of the electrode lead with a multimeter If the electrode lead is faulty replace it with a new one One or more of the leads from the Z C3 and C4 input jacks are not attached to the patient Attach these leads to the patient because the Z electrode and C3 and C4 electrodes are necessary for EEG measurement The bed is not grounded If the bed is metal ground it The electroencephalograph is not grounded If the AC outlet on the wall does not have a ground terminal ground the electroencephalograph with the provided ground lead Several medical electronic instruments are used together Perform equipotential grounding for each instrument There is an AC outlet or table tap near the patient or bed Arrange the measurement environment so that there is no influence from an AC power line The PC uni
4. The input boxes have save ID Disconnect one input box or set different ID s for each input box The two PSG input box are used and the ID number of the second PSG input box is not set to 2 Set the ID number of the second PSG input box to 2 Refer to PSG Mother Board in Section 3 Service Manual JE 912AK 2 7 2 IROUBLESHOOTING AND ERROR MESSAGES SpO2 Measurement The SpO error message is displayed on SpO channel of the extended channel bar and event bar Solve the problem referring the following table When the SpO error message is displayed the SpO value becomes 0 V Error Message Possible Causes Action SpO2 UNSTABLE PULSE Patient body movement Check the patient condition Remove the cause by changing the attachment site etc Probe attachment is unstable Firmly attach the probe to the patient SpO2 CONNECTOR OFF SpO2 adaptor is disconnected from the Firmly connect the SpO2 adaptor to the PSG input box PSG input box Faulty SpO2 adaptor Replace the SpO2 adaptor SpO2 CHECK PROBE Probe is detached from the patient Check the probe attachment condition Probe is disconnected from the SpO2 Firmly connect the probe to the SpO2 adaptor SpO2 WEAK PULSE Poor peripheral circulation Check the patient condition Remove the cause by changing the attachment site etc Probe is attached too tight and prevents Reattach the pr
5. B Service Manual JE 912AK iii Conventions Used in this Manual and Instrument Warnings Cautions and Notes Warnings cautions and notes are used in this manual to alert or signal the reader to specific information WARNING A warning alerts the user to possible injury or death associated with the use or misuse of the instrument CAUTION A caution alerts the user to possible injury or problems with the instrument associated with its use or misuse such as instrument malfunction instrument failure damage to the instrument or damage to other property NOTE A note provides specific information in the form of recommendations prerequirements alternative methods or supplemental information Explanations of the Symbols in this Manual and Instrument The following symbols found in this manual instrument bear the respective descriptions as given Symbol Description Symbol Description Type BF applied part Date of manufacture Attention consult operator s The CE Mark is a protected manual conformity mark of European Community The products C herewith comply with the 0086 requirements of the Medical serialnumber Device Directive 93 42 EEC iv Service Manual JE 912AK Precautions for Input Jack Use NOTE Do not perform EEG measurement without the Z C3 C4 A1 and A2 electrodes Use of input jack Z Connect the lead from the electrode Z electrode attached on the patient
6. Checking tool When checking the internal noise of the PSG input box and skin electrode impedance check function the checking tools are necessary Refer to Section 5 Maintenance 1 3 1 GENERAL General Information on Servicing 1 4 Note the following information when servicing the PSG input box CAUTION Safety There is the possibility that the outside surface of the PSG input box such as the operation keys could be contaminated by contagious germs so disinfect and clean the PSG input box before servicing it When servicing the PSG input box wear rubber gloves to protect yourself from infection Liquid ingress The PSG input box is not waterproof so do not install the PSG input box where water or liquid can get into or fall on the PSG input box If liquid accidentally gets into the PSG input box or the PSG input box accidentally drops into liquid disassemble the PSG input box clean it with clean water and dry it completely After reassembling verify that there is nothing wrong with the patient safety checks and function performance checks If there is something wrong with the PSG input box contact your Nihon Kohden representative to repair it Disinfection and cleaning To disinfect the outside surface of the PSG input box wipe it with a non abrasive cloth moistened with any of the disinfectants listed below Do not use any other disinfectants or ultraviolet rays to disinfect the PSG input box C
7. Kohden distributor or representative WARNING When checking a cable connection close the EEG application program turn off the power of the electroencephalograph and all connected external instruments and unplug the AC power cord from the AC outlet For the procedure refer to the next page Failure to follow this warning may cause electrical shock After checking the cable connection turn on the power of all components then restart the PC unit 2 1 2 TROUBLESHOOTING AND ERROR MESSAGES Closing the Program and Shutting Down Windows 1 Open the Windows Task Manager When the mouse does not operate 1 Press the Ctrl Alt Del key The Windows Security dialog box opens 2 Select Task Manager to open the Windows Task Manager dialog box When the keyboard does not operate 1 Right click the task bar The pop up menu opens 2 Select Task Manager to open the Windows Task Manager dialog box 2 Select the program to close 3 Select the End Task button 4 Shut down Windows 1 Select Shut Down from the Start menu Or press the Ctrl Esc key then press the U key The Shut Down Windows dialog box opens 2 Select Shut Down in the What do you want the computer to do list box 3 Select the OK button Windows shuts down and the PC unit power is automatically turned off 2 2 Service Manual JE 912AK Troubleshooting Waveform Acquisition 2 TROUBLESHOOTING AND ERROR MESSAGES
8. Notused 26 O Notused 28 O Notused 29 O Not used 34 O Notused 35 O Notused 36 O 43 Q 44 Q Not used J 49 O 50 O 1MQ To PSG input box Service Manual Input checker JE 912AK O Ground reference 120 Hz 0 3 s 10 uV mm Off G G Any electrode OV 4 Apply 500 mV sine waves between pin 50 500 mV and 1 ground 5 With the Voltage cursor check that the amplitude of each channel is 50 uV mm The amplitude of C3 0V C4 0V is 0 V flat Required Parts O 500 mV Description Qty Code No Connector PCR S50FS 1 545287 Housing PCR LS50LA 1 545394 Resistor SN14C2CT26 1 00MQ 1 070086 Resistor SN14C2CT26 100 Q 1 066242 5 3 5 MAINTENANCE 5 4 scht Acc ACC Acc Checking the Input Signal for Each Channel You can check that applied input signals are correctly processed for each channel with the JE 0005 EEG Pattern Checker and YZ 0243 JE 912A AK Connection Cable 1 Connect the EEG pattern checker to the multiple connector of the PSG input box with the JE 912AK connection cable Code No 545634 2 Start the Acquisition program 3 Setthe EEG instrument to the following settings High cut filter Off Time constant lor0 3s Sensitivity 10 uV mm AC filter Off Reference Off Sweep speed 10 s page Montage setting Set as shown left 4 Turn on the power of the EEG pattern checker and press the START button EEG patte
9. box Failure to follow this warning may cause serious electrical burn on the patient due to local heating caused by dielectric electromotive force For details refer to the instruction manual for the MRI When performing defibrillation Before defibrillation remove from the patient all electrodes and transducers which are connected to connectors that do not have a joj or Jak mark Otherwise the discharged energy may cause serious electrical burn or shock to the operator Before defibrillation remove all electrodes and transducers from the patient which are connected from this PSG input box If the defibrillator paddle directly contacts these materials the discharged energy may cause serious electrical burn to the patient Before defibrillation all persons must keep clear of the bed and must not touch the patient or any equipment connected to the patient Failure to follow this warning may cause serious electrical burn shock or other injury Service Manual JE 912AK Installation Electrode and Sensor Attachment Cable Connection Service Manual JE 912AK 1 GENERAL WARNING Connect only the specified instruments to the connectors or socket marked with by following the specified procedure Otherwise electrical leakage current may harm the patient and operator CAUTION When connecting the cables make sure that each instrument is turned off WARNING Do not connect the
10. in charge Mouth gags tongue depressors and gauze sponges must always be prepared for use to prevent the patient from biting his tongue or injuring himself during testing because any pattern of flash stimuli may induce seizure activity When using the NE 224S Sub dermal Straight Needle Electrode or Intracranial Electrode Do not use the NE 224S sub dermal straight needle electrode as a measurement electrode for the EEG or evoked potential measurement for any longer than one hour When measuring the EEG or evoked potential for over one hour use the EEG disk electrode Do not check the skin electrode impedance when using a needle electrode or intracranial electrode Failure to follow this warning injures the patient because these electrodes will be damaged by electrolyzation inside the body WARNING SpO measurement may be incorrect in the following cases When the carboxyhemoglobin HbCO or methemoglobin metHb increases abnormally When dye is injected in the blood When using an electrosurgical unit During CPR When measuring at a site where there are venous pulses When there is body movement When the pulse wave is small When measuring the patient with peripheral circulation insufficiency When the SpO probe is used on a neonate low birth weight infant or patient with a fever or peripheral circulation insufficiency a slight burn may result from the probe increasing the skin temperature at the attached
11. only by qualified service personnel WARNING To avoid the possibility of injury to yourself or damage to the PSG input box do not install or remove any component or change switch settings while the power is on To avoid accidental discharge of static electricity which could damage the components of the PSG input box use a grounded wrist strap when installing or removing any component of the PSG input box Before connecting or disconnecting a cable close the EEG application program shut down Windows turn off all components and unplug the AC power cord from the AC outlet CAUTIONS e Removal and replacement of any components in the PSG input box should only be done by qualified service personnel Use only parts recommended by Nihon Kohden to assure maximum performance from your PSG input box Anti static bench mat Wrist ground strap Phillips screwdriver insulated type for M3 and M4 screws Hex socket driver for 8 mm floating bolt 5 5 mm spacer bolt and nut Tweezers 4 DISASSEMBLY Disassembly 1 Turn the PSG input box front side down 2 Remove the four M4 binding head screws which fasten the rear cover to the front cover 3 Remove the rear cover 4 Remove the five 8 mm floating bolts which fasten the PCB unit to the front cover inside the shield sheet OUT PCB unit inside the shield sheet OUT 4 2 Service Manual JE 912AK 4 DISASSEMBLY 5 Remove
12. qualified user technical personnel upon request from your Nihon Kohden distributor 9 When the instrument is used with an electrosurgical instrument pay careful attention to the application and or location of electrodes and or transducers to avoid possible burn to the patient 10 When the instrument is used with a defibrillator make sure that the instrument is protected against defibrillator discharge If not remove patient cables and or transducers from the instrument to avoid possible damage WARRANTY POLICY Nihon Kohden Corporation NKC shall warrant its products against all defects in materials and workmanship for one year from the date of delivery However consumable materials such as recording paper ink stylus and battery are excluded from the warranty NKC or its authorized agents will repair or replace any products which prove to be defective during the warranty period provided these products are used as prescribed by the operating instructions given in the operator s and service manuals No other party is authorized to make any warranty or assume liability for NKC s products NKC will not recognize any other warranty either implied or in writing In addition service technical modification or any other product change performed by someone other than NKC or its authorized agents without prior consent of NKC may be cause for voiding this warranty Defective products or parts must be returned to NKC or its authorized agents a
13. s nasion to the input jack Z on the electrode junction box The purpose of this input jack is to eliminate AC interference positively NOTE The input jack Z is also used for checking electrode impedance Use of input jacks C3 and C4 Connect the leads from the electrodes attached on the positions C3 and C4 to the input jacks C3 and C4 respectively NOTE e The C3 and C4 electrodes are the reference electrodes for EEG measurement e The input jacks C3 and C4 must be attached for EEG measurement even when the C3 and C4 are not programmed in any montage Use of input jacks A1 and A2 C3 and C4 during skin electrode impedance check When checking each electrode impedance connect the leads from the electrode attached on the positions Al A2 C3 and C4 to the input jacks Al A2 C3 and C4 respectively NOTE e The A1 and A2 electrodes are the reference electrodes for skin electrode impedance check e The input jacks A1 and A2 in addition to the Z C3 and C4must be attached for the electrode impedance check f Z ECG AIRFLOW Checking electrode potentials for all active electrodes O O Check the original electrode potential for all active electrodes by AG 9x programming a montage with the system reference electrode Select RO OX Pini the 0 V button for reference electrode on the Montage dialog box c3 x7 ER tO Refer to Programming Patterns in Section 2 of the Operator s Sie x8 f X30 manual 01
14. the PCB unit from the front cover 6 Remove the five M3 screws with spring washers and open the shield sheet OUT A 7 Remove the flat cable and USB cable which are connected to the PSG MOTHER board PSG MOTHER board USB cable Flat cable Service Manual JE 912AK 43 4 DISASSEMBLY The boards are connected with 5 5 mm spacer bolts and 5 5 mm spacer nuts Spacer bolt Spacer nut 4 4 Service Manual JE 912AK Section 5 Maintenance Checking the PSG Input BOX snrnananenneananananannnanannnnnaanananananaaaaaaaaennaaanana a 5 1 Gheeking NAISE Lee 5 1 Checking the Skin electrode Impedance Check Function 5 2 Checking the EEG Input Circuit vemmrennrenennnenanaanaaeeanaaanannnnnanaanna na 5 3 Checking the Amplifier uuu qu usan UE kah alalt 5 3 Checking the Input Signal for Each Channel 5 4 Service Manual JE 912AK 5C 1 This page is intentionally left blank 5C 2 Service Manual JE 912AK Checking the PSG Input Box Checking Noise Circuit diagram Not used Not used Not used Not used Not used Not used Not used To PSG input box Service Manual 5 MAINTENANCE Use the EEG noise checker to check the internal noise of the PSG input box This checker shorts circuits all EEG inputs as shown in the circuit diagram Assemble the EEG noise checker locally
15. with parts that are purchased locally or from your Nihon Kohden distributor or representative 1 Connect the EEG noise checker to the multiple connector of the PSG input box 2 Start the Acquisition program 3 Set the EEG instrument to the following settings High cut filter 60 Hz Time constant 0 3 s Sensitivity lu V mm AC filter Off Montage Any montage except E lead connection pattern 4 Check that the amplitude of the noise on the screen is less than 1 5 mVp p 16 O Required Parts Description Qty Code No Connector PCR S50FS 1 545287 mm Housing PCR LS50LA 1 545394 25 26 O 27 28 O 29 O 34 O JE 912AK Noise checker 5 1 5 MAINTENANCE Checking the Skin electrode Impedance Check Function Circuit diagram Not used Not used Not used Not used Not used Not used Not used To PSG input box 9 2 35 O 36 O 87 O A 42 O vw Use the EEG impedance checker to check the skin electrode impedance check function This checker shorts circuits all EEG inputs as shown in the circuit diagram Assemble the EEG impedance checker locally with parts bought locally or from your Nihon Kohden distributor or representative We recommend assembling the five different checkers to perform the impedance check for the five different resistance values Checker 1 Checker 2 Checker 3 Checker 4 Checker 5 Resisto
16. 000 01 010 Code No 501503 4to7 Nevaccd Cable side 3 5 miniature jack Code No 606907 Operator s Manual JE 912AK 7 1 5 CONNECTOR PIN ASSOGNMENT Multiple Connector WARNING When the JE 914A Mini Junction Box is not used make sure that the multiple connector cover in firmly attached to the PSG input box Failure to follow this warning may cause electrical shock to the patient and operator CAUTION m Only connect the ESRA Mini Junction Box When another type of mini junction box is connected the PSG input box malfunction Pin No Signal Pin No Signal l 1 X5 26 DC2 BODY 50 2 X6 27 MINI DTC 3 X7 28 Not used Unit side PCR E50LMD SLB I 4 X8 29 X19 Code No 513713 5 C3 30 XI Cable side Connector PCR S50FS Code No 545287 et 31 SE Housing PCR LS50LA 7 X9 32 X3 Code No 545394 8 X10 33 XA 9 OI 34 X20 10 02 35 X21 11 Al 36 Not used 12 A2 37 X19 FLW 13 X11 38 X19 FLW 14 X12 39 X20 CHT 15 X13 40 X20 CHT 16 X14 41 X21 ABD 17 X15 ECG 42 X21 ABD 18 X15 ECG 43 Z 19 X16 PLMI 44 X19 SEL 20 X16 PLM1 45 X20 SEL 21 X17 PLM2 46 X21 SEL 22 X17 PLM2 47 Not used 23 X18 48 Not used 24 X18 49 Not used 25 AGND 50 Not used 7 2 Operator s Manual JE 912AK
17. D components yourself Measuring and Test Equipment Maintain the accuracy of the measuring and test equipment by checking and calibrating it according to the check and calibration procedures 1 5 1 GENERAL General Safety information 1 6 WARNING e Never use this PSG input box in the presence of any flammable anesthetic gas or high concentration oxygen atmosphere Failure to follow this warning may cause explosion or fire Never use this PSG input box in a high pressure oxygen medical tank Failure to follow this warning may cause explosion or fire Using with an electrical surgical unit ESU Never use this PSG input box near an ESU The PSG input box may malfunction due to high frequency noise from the ESU When using this PSG input box with an ESU refer to the instruction manual forthe ESU Before measurement check that the return plate is correctly attached to the patient and that the PSG input box operates correctly when using with the ESU If the return plate is not attached correctly it may burn the patient s skin where the electrodes are attached Before using the ESU remove all needle electrodes and silver ball electrodes from the patient Failure to follow this warning may cause burn on the patient MRI examination The PSG input box is not intended to be used during MRI When performing MRI tests remove all electrodes and transducers from the patient which are connected to this PSG input
18. EEG 1100A EEG 1100J EEG 1100K EEG 1100G EEG 9100A EEG 9100J EEG 9100K EEG 9100G EEG 9200A EEG 9200J EEG 9200K EEG 9200G PSG INPUT BOX JE 912AK 0634 001691A Section 1 Section 2 Section 3 Section 4 Section 5 CONTENTS Contents GENERAL HANDLING PRECAUTIONS uuu sese nene i WARRANTY POLDIGY itecto rette ki de i eere teer b cec a AAA ii Conventions Used in this Manual and Instrument sesseesseeeseeeessreserressersssrisssrrnsens iv Warnings Cautions and Notes Li iisas aasawa sabes iv Explanations of the Symbols in this Manual and Instrument sseeeeseeee iv Precautions for Input Jack Use mmannnnnneennannnenenaannaannananaaanananaannnanan annan V ic 0 1C 1 MALLOAUGUOID e cT 1 1 FCM GOS av 1 1 General Safety information svare apene 1 2 Panel Deseriptions RR 1 7 JE 912AK PSG Input BOX smeden sua obs aute are r en tenete dere badet kude da 1 7 JE 914A Min JUNCTION BOX oett Eee EE Eee ee eter Ee et humant 1 9 Troubleshooting and Error Messages 2C 1 How to TROWDIGSMOOL EE 2 1 Closing the Program and Shutting Down Windows 2 2 Troubleshodimg eem 2 3 VWavetorm ACQUISITION EEN 2 3 COMME AEE EE nan 2 6 Error MESSAGES uy MEE 2 7 ACQUISITION PFOQFaIW Su up iene Re E 2 7 SPO hil Re EE EEE E 2 8 Board DESONDNON aii u uuu assassssasskayassskassapussassskusyasasaa 3C 1 EC
19. ESCRIPTION Electrode potential signals from the JE 914A Mini Junction Box are processed as follows The top of each EEG amplifier circuit and respiration pickup bipolar deviation circuit has an input protection circuit to limit the input voltage within 9 V EEG Primary Amplifier Circuits 2 second time constant circuit Provides a 2 second time constant Primary operational amplifier x8 Amplifies the difference between the two input signals 8 times System Reference Voltage Generation Circuit Averages the electrode potential between C3 and C4 and amplifies 1 14 times This voltage is used for the system reference voltage for waveform acquisition Z Signal Generation Circuit Averages the electrode potential between C3 and C4 This voltage is fed back to the Z electrode to reduce artifact Bipolar Derivation Primary Amplifier Circuit Primary operational amplifier Amplifies the difference between pair of input signals for bipolar derivation 8 times Respiration Pickup Circuit Airflow Sensor Input Circuit Primary operational amplifier Respiration pick up circuit Amplifies the difference between pair of input signals for bipolar derivation 8 times Airflow sensor input circuit Buffers the signal from airflow sensor 2 second time constant circuit Provides a 2 second time constant Reset circuit Resets the trace to the baseline Secondary operational amplifier x117 Amplifies the signals 117 t
20. Not suitable for use in the presence of a flammable anaesthetic mixture with air or oxygen or nitrous oxide Continuous IEC60601 1 2 1993 CISPR11 1990 Groupl CLASS B 185 W x 72 D x 167 H mm 1 0 kg 76 W x 25 D x 124 H mm 0 2 kg Cable length 2 8 m 1 GENERAL Operation conditions Temperature Humidity Atmospheric pressure Transport and Storage Conditions Temperature Humidity Atmospheric pressure 10 to 35 C 50 to 95 F 30 to 80 non condensing 70 kPa to 106 kPa 20 to 65 C 4 to 140 F 10 to 95 non condensing 70 kPa to 106 kPa Service Manual JE 912AK 1 GENERAL Panel Descriptions JE 912AK PSG Input Box WARNING Connect only the specified instruments to the connectors or socket marked with by following the specified procedure Otherwise electrical leakage current may harm the patient and operator Front panel J z ECG PLM2 B X15 x17 AIO Oxs 020 Ox10 O ao 1420 Oxe X10 OX11 Lol Lo PLM1 030 OX X20 ous AM ve c40 OX8 xsO OX 3 O 0 010 om xo oxu Lol Lo SELECTOR kQ 00000 Ty 2 5 10 20 50 OD T Str wd ow do ow D Gi E Sp CC j eo Ke DIO Er E I G Metasse CHECK Spo amp OD x DC ES NIHON KOHDEN Neurofax Name 1 Impedance display LED 2 2 5 10 20 50 kQ SELECTOR Impedance preset key 3 IMPEDANCE CHECK key
21. Z electrode lead plug to a ground or equipotential ground Otherwise leakage current from another instrument cause electrical shock to the patient When the JE 914A Mini Junction Box is not used make sure that the multiple connecter cover is firmly attached to the electrode junction box Failure to follow this warning may cause electrical shock to the patient and operator Before connecting or disconnecting the DC input cable to the DC input connector make sure that the power of the external instrument is turned off or DC signal is not output from the external instrument Failure to follow this warning may cause electrical shock to the patient and operator Connect only the specified respiration sensor or pickup to the AIRFLOW CHEST and ABDOMEN connector by following the specified procedure Otherwise electrical leakage current may harm the patient and operator CAUTION Before attaching a sensor check whether it contains dry natural rubber or not Natural rubber may cause allergic reaction with symptoms such as itching redness urticaria swelling fever dyspnea symptoms similar to asthma reduced blood pressure and shock If the patient shows any of the above symptoms immediately stop using the chest movement sensor and perform appropriate medical treatment SI 1 GENERAL Operation SpO Measurement 1 8 WARNING All activation testing must be applied under the supervision of the physician
22. and hold circuit and outputs it as serial data 3 5 3 BOARD DESCRIPTION PSG MOTHER Board pieoq dINV OSd OL ONE ONOV ayn aonad OA I L60ND ANDA AS Ager lt AS OLG aN MS 3 1 OOSX 007 K MS MHOANI MER GJ SE AXL qxu OLA zods NO zOds 180NO p1eoq I 1S 01S 631 0q31 INdNI OSd OL OZONO AA s JE8SAUOD i yN ad 1 nese eouepeduj 0Z0NO 191194409 Ou I Ionuoo asn Yun Od or 9lqeo qsn i Lyon gt i viva i T j an9a u 2dAL xoar I Loo DE od oj qi xog M l X 0S HOANI Wun uo Su DI Geh H L VIS SEI OMS 8 MS V NS xog r HS 1 K mem EN vi e 0840 eouepedui Xd Oe A L60n x viva LOEN i 9010 Tonn OSONO ied JEO o pieoq Ai OSd OL mA ndo HOLE gt V60 HS ronn lt F 4 4 AS lt gt ACE AA G AS V603 QHVO L 60N 13119 Buneolj i Buneoj uoN L 1eMOd i Ager AS Service Manual JE 912AK 3 6 3 BOARD DESCRIPTION This board consists of the following components PSG Input Box Control Circuit Controls the overall operation of the PSG input box at 100 MHz clock frequency using a SH7709A CPU U091 CARD E09A The EPROM 256 kBx16 bit contains the program to control the PSG input box operation Simultaneo
23. ccessories from your Nihon Kohden representative please quote the NK code number and part name which is listed in this service manual and the name or model of the unit in which the required part is located This will help us to promptly attend to your needs Always use parts and accessories recommended or supplied by Nihon Kohden Corporation to assure maximum performance from your PSG input box Service Manual JE 912AK Patient Safety Checks Maintenance Equipment Tools Service Manual JE 912AK 1 GENERAL Periodic maintenance procedures and diagnostic check procedures are provided in this manual to ensure that the PSG input box is operating in accordance with its design and production specifications To verify that the PSG input box is working in a safe manner with regard to patient safety patient safety checks should be performed on the PSG input box before it is first installed periodically after installation and after any repair is made on the PSG input box For patient safety checks perform the following checks as described in the IEC60601 1 Medical electrical equipment Part 1 General requirements for safety Protective earth resistance check Earth leakage current check Enclosure leakage current check Patient leakage current check Withstanding voltage check Test equipment When repairing or calibrating the PSG input box the following test equipment is required Oscillator standard type
24. ck or the PSG input box may malfunction Maintenance CAUTION Do not disassemble the PSG input box when checking the PSG input box or performing maintenance If there is any damage or the PSG input box is suspected to be faulty attach an Unusable or Repair request label to the system and contact your Nihon Kohden distributor or representative Service Manual JE 912AK 1 9 1 GENERAL WARNING The programs contained in the system program installation CD ROM are protected by copyright law and international treaties Unauthorized reproduction or distribution of this software or any portion of it may result in severe civil and criminal penalties and will be prosecuted to the maximum extent possible under law NOTE When the PSG input box is used in a high frequency electric field the displayed waveform may be thicker When the optional JL 951T3 SpO Adapter is connected to the PSG input box and there is an extreme power surge an SpO UNSTABLE PULSE message appears To prevent noise from the AC power line ground the electroencephalograph with a low impedance ground lead i e 1 5 m or less connect the AC power cord to another AC outlet and or turn off the power of surrounding equipment When the system program version of the EEG 1100A J K G Electroencephalograph is 03 01 03 02 or 03 11 the PSG input box can be connected Upgrade the system program with the provided system disk Refer
25. e to exit the acquisition program Insert a new disk CAUTION Do not turn off the power of the main unit or connected instruments Photo Drive unit or MO drive This can cause loss of EEG data and damage to the hard disk The storage drive the MO disk or hard disk which saves the EEG data file is almost full Click the OK button on the message dialog box then end the measurement and save the file Refer to Starting and Ending EEG Measurement Ending the Measurement and Saving the File in Section 5 of the EEG Operator s manual After saving the file prepare a new MO disk or delete unnecessary files in the hard disk The waveform is not displayed The color of the waveform and background is the same Use a different color for waveform and background The Display setting in the Pattern table is set to Off Set the Display setting to On for necessary channels The AC filter does not function The AC filter setting is not correct Select the correct AC filter setting 50 or 60 Hz in the System program Noise is not caused by AC line influence Use the proper filter according to the artifact Noise in AV derivation An unused electrode for AV derivation is selected in the AV Delete dialog box Delete unnecessary electrodes for AV derivation in the AV Delete dialog box The electrode name on the screen is indicated in red The electrode that is used for measurement i
26. ensor jack A UT 0730 1 PSG JUNCTION board EE e EE 12 25 E Gi T x 5 22 g ze LEE 8 HOk 6 4 Service Manual JE 912AK Section 7 Connector Pin Assignment Input Output Connector Jack Pin Assignment a 7 1 BASLE 19 210114 510 c EE 7 1 SPO CONNECT ON M 7 1 DC Input Connector per a uu ua au uba a adda iaa anaoa a aanre 7 1 REMOTE MARK Connector iniri Masia ee eee 7 1 Service Manual JE 912AK 7C 1 This page is intentionally left blank 7C 2 Service Manual JE 912AK 7 CONNECTOR PIN ASSOGNMENT Input Output Connector Jack Pin Assignment WARNING Connect only the specified instruments to the connectors or socket marked with by following the specified procedure Otherwise electrical leakage current may harm the patient and operator PSG Input Box SpO Connector PIn No Signal 1 DGND 2 Not used 3 5 V OUT 4 RxD 5 TxD Unit side TCS7678 01 201 idi Cable side MP 371 7 7 CON CHK DC Input Connector Max 3 V input impedance 1 5MQ 1 PIn No Signal 3 v A 1 DGND 2 DC INPUT channel 3 5 7 9 DC INPUT Unit side HSJ1462 01 010 Code No 608389 3 channel 4 6 8 10 Cable side 2 5 miniature jack KP 2S Code No 608406 7 REMOTE MARK Connector ga 2 Pin No Signal 3 4 1 Not used A t 5 1 2 MARK INPUT 3 DGND Unit side HSJ2
27. ering parts or accessories from your nearest Nihon Kohden Corporation distributor please quote the NK code number and part name which are listed in this service manual and the name or model of the unit in which the required part Is located This will help us to promptly attend to your needs Always use Nihon Kohden parts and accessories to assure maximum performance from your instrument 6 1 6 REPLACEABLE PARTS LIST JE 912AK PSG Input Box Index Code No 6112 015677 6112 014286B 6132 013266B 6112 015499 6112 014259A 6114 056263A 6124 032421B 6114 11809B 6114 117447 6124 000668C 6114 000668C 127997 292015 6114 121585 596712 128069 VD OI NA KO LN O ON QA U N A UT 0727 UT 0728 C UT 0729 ive d 531079 6 2 Description Front cover Rear cover Front panel for JE 912AK Shiled sheet OUT Shiled sheet IN Floating bolt USB cable holder Connector cover Sponge DC INPUT panel Holder attachment Spacer bolt L9 Spacer nut L12 LED spacer Spacer L7 Spacer nut L9 PSG INPUT board PSG AMP board for PSG MOTHER board JE912AK USB cable Service Manual JE 912AK 6 REPLACEABLE PARTS LIST Service Manual JE 912AK 6 3 6 REPLACEABLE PARTS LIST JE 914 Mini Junction Box Index NK Code No Qty Description 1 6112 005072B 1 Front panel 2 6143 01177 1 Rear cover assy 3 6113 041094A 1 Strap 4 6114 005612 35 Electrode jack 5 273482 4 S
28. estart the program Faulty USB cable connection Check that the USB cable from the PSG input box is correctly connected to the PC unit then open the Acquisition program USB 902 No electrode junction box was detected Confirm the electrode junction box is connected and restart the Acquisition program The PSG input box is not recognized Check that the USB cable from the PSG input box is correctly connected to the PC unit then open the Acquisition program If the same error message appears again reinstall the PSG input box driver or replace the PSG input box USB 903 The electrode junction box is disconnected or there is a data transmission error After the Acquisition program closes turn off the power confirm the electrode junction box is connected and restart the Acquisition Faulty data communication between the PSG input box and PC unit 1 Close the Acquisition program 2 Turn the PC unit off 3 Check that the USB cable is correctly connected to the PC unit 4 Restart the PC unit 5 Open the Acquisition program USB 904 An overflow occurred during data transmission from the electrode junction box Restart the Acquisition program Overflow occurs during data transfer 1 Close the Acquisition program Turn the PC unit off 3 Check that the USB cable is correctly connected to the PC unit 4 Restart the PC unit 5 Open the Acquisition program
29. g Two PSG Input Boxs You can measure the polysomnogram for two patients simultaneously by using two PSG input boxs To use two PSG input boxes do the following 1 Setthe ID number to 2 for the second PSG input box The ID number can be set by the JO12 jumper switch on the PSG MOTHER board in the PSG input box The default setting is 1 To change the setting refer to the service manual When the power of the electroencephalograph is turned on the 10 kQ or 20 kQ impedance display LED lights to indicate the ID number ID 1 10 KQ ID 2 20 kQ 2 Create the shortcut icons for the first and second PSG input boxes Refer to Settings When Using Two PSG Input Boxs in Section 2 of the Operator s manual 3 8 Service Manual JE 912AK Section4 Disassembly Before You Begin su gd uu a tue eden entendre eege vekten 4 1 Warnings Cautions and Notes a 4 1 Required 070 S unner aa u 4 1 Disa semblyx EEN 4 2 Service Manual JE 912AK 4C 1 This page is intentionally left blank 4C 2 Service Manual JE 912AK Before You Begin Warnings Cautions and Notes Required Tools Service Manual JE 912AK 4 DISASSEMBLY The procedures in this section tell how to remove replace and install major components in the PSG input box To remove the connection cables refer to Cable Connections in Section 2 of the Operator s manual Removing replacing and installing major components should be done
30. hlorohexidine gluconate solution 0 5 Benzethonium chloride solution 0 2 Glutaraldehyde solution 2 0 Benzalkonium chloride 0 2 Hydrochloric alkyldiaminoethylglycine 0 5 Transport Use the specified shipment container and packing material to transport the PSG input box If necessary double pack the PSG input box Also put the PSG input box into the shipment container after packing so that the buffer material does not get inside the PSG input box Service Manual JE 912AK Service Manual JE 912AK 1 GENERAL Caution continued When transporting the board or unit of the PSG input box be sure to use a conductive bag Never put the it in an aluminum bag to transport a bord or unit which a lithium battery is mounted Never wrap the board or unit of the PSG input box and mini junction box in a styrene foam or plastic bag which generates static electricity Handling the PSG input box Because the outside surface of the PSG input box is made of resin the outside surface of the PSG input box is easily damaged So when handling the PSG input box remove clutter from around the PSG input box and be careful to not damage the PSG input box or get it dirty Because most of the boards in the PSG input box are multilayer boards with surface mount electrical devices SMD a special tool is required if remove and solder the elctrical devices on it To avoid damaging other electrical components do not remove and solder SM
31. hricibme dulasdaasados 3 1 Block Diagram EE 3 1 PSG INPUT Board and PSG AMP Board uu a aususspat asa kaqaaaawaaqa qawa daqa sassawaatha qaqaqa 3 2 PSG MOTHER Boardi EEUU 3 6 Settings When Using Two PSG Input Boxes a 3 8 IL tpn gg S 4C 1 Before You BOJI ua u a ee e ee 4 1 Warnings Cautions andhNotes ener nnne 4 1 194570 01810 1 070 c 4 1 NEE yu u um EE 4 2 Ee E E 5C 1 Checking the PSG Input BOX EE 5 1 Service Manual JE 912AK 1 CONTENTS EN al fr 5 1 Checking the Skin electrode Impedance Check Function 5 2 Checking the EEG Input Circuit uuu u asa a uagtiss hawa ikstawqa ustusqa sky Si 5 3 Checking the Amplifier eene 5 3 Checking the Input Signal for Each Channel 5 4 Section 6 Replaceable Parts List 6C 1 JE 912AK PSG Input Box EE 6 2 JE 914A Mini Junction BOX uu conocido d a e oe a neat taa ri bes 6 4 Section 7 Connector Pin Assignment c ecco 7C 1 Input Output Connector Jack Pin Assignment a 7 1 PSG Input E 7 1 OPO c 7 1 DC Input CGonpnechor E E a a a Saa ya as nennen nnns nre nnn nnne 7 1 REMOTE MARK Connector u Lu aspas enne nnne 7 1 C 2 Service Manual JE 912AK GENERAL HANDLING PRECAUTIONS This de
32. ifier corresponding to the signal is faulty Replace the PSG AMP board SpO2 data is not displayed The On Off setting of the DC01 channel SpO2 channel in the DC Input Conversion Display Setting dialog box is set to Off Pattern table DC Conversion button Set the On Off setting to On DC Input Conversion Display Setting dialog box Set a Channel dialog box On Off area The respiration waveform input to the AIRFLOW CHEST or ABDOMEN connectors is not displayed A respiration pickup is connected to the corresponding X19 to X21 jack Remove the respiration pickup from the corresponding jack The signal input to any of the X15 to X21 bipolar derivation jack The reference electrode G2 is not set to 0 V Set the reference electrode to 0 V NOTE Either of the following combinations cannot be used X19 jacks and AIRFLOW connector X20 jacks and CHEST connector X21 jacks and ABDOMEN connector If either of the above combinations is used the signal from the X19 X20 or X21 jacks is measured the displayed waveform may be thicker Service Manual JE 912AK When the PSG input box is used in a high frequency electric field 2 5 2 IROUBLESHOOTING AND ERROR MESSAGES Control Problem Possible cause Action When the power is turned on Windows does not start Faulty PSG input box 1 Turn the power of the PC un
33. imes Anti aliasing circuit 120 Hz 18dB Oct Filters any aliasing signal 3 3 3 BOARD DESCRIPTION PSG AMP board 3 4 Body Position Sensor Input Circuit Buffer amplifier Provides 1 5 MQ input impedance Reset circuit Resets the trace to the baseline Attenuator Attenuates the signals 1 4 Anti aliasing circuit 120 Hz 18dB Oct Filters any aliasing signal EEG Secondary Amplifier Circuit Bipolar Deviation Secondary Amplifier Circuit 2 second time constant circuit Provides a 2 second time constant Reset circuit Resets the trace to the baseline e Secondary operational amplifier x117 Amplifies the signals 117 times Anti aliasing circuit 120 Hz 18dB Oct Filters any aliasing signal Sample and Hold Circuit Samples and holds signals at 1 KHz sampling frequency Impedance Check Indicator Impedance check LEDs Shows the result of the electrode impedance check Impedance threshold LEDs Shows the skin contact impedance check threshold DC Input Circuit Buffer amplifier Provides 1 5 MQ input impedance Reset circuit Resets the trace to the baseline Anti aliasing circuit 70 120 Hz 18dB Oct Filters any aliasing signal Service Manual JE 912AK Service Manual JE 912AK 3 BOARD DESCRIPTION Sample and hold circuit 1 KHz Samples and holds signals at 1 KHz sampling frequency Multiplexing Circuit Multiplexes the data from the sample
34. it off 2 Remove the USB cable from the PC unit 3 Restart the PC unit If Windows starts correctly the PSG input box is faulty Replace the PSG input box Problem with the Windows operating system Reinstall the Windows operating system and EEG system program Refer to the service manual of each electroencephalograph Faulty PC unit Replace the PC unit The EEG application program does not work correctly A screen saver program is active Close the screen saver program Another windows application program is active Close all Windows application programs Or delete the application program if it conflicts with the EEG system program The two PSG input box are used and the ID number of the second PSG input box is not set to 2 Set the ID number of the second PSG input box to 2 Refer to PSG Mother Board in Section 3 The USB cable from the PSG input box is not connected to the PC unit Turn off the power of the PC unit then connect the USB cable to the PC unit correctly Faulty PSG input box Replace the PSG input box if an error message for the PSG input box appears Problem with the EEG application program Reinstall the EEG system program Faulty PC unit Replace the PC unit 2 6 Service Manual JE 912AK Error Messages Acquisition Program 2 TROUBLESHOOTING AND ERROR MESSAGES Following is a list of error messages duri
35. lectromagnetic 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 with 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 2 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 3 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 4 Electromagnetic interference with any radio wave receiver such as radio or television If the equipment and or system interferes with any radio wave receiver locate the equipment and or system as far as possible from the radio wave receiver If the above suggested remedial actions do not solve the problem consult your Nihon Kohden Corporation subsidiary or distributor for additional suggestions The CE mark is a protected conformity mark of the European Community The products herewith comply with the requirements of the Medical Device Directive 93 42 EEC This equipment complies with EUROPEAN STANDARD EN 60601 1 2 1993 which requires EN 55011 class
36. long with an explanation of the failure Shipping costs must be pre paid This warranty does not apply to products that have been modified disassembled reinstalled or repaired without Nihon Kohden approval or which have been subjected to neglect or accident damage due to accident fire lightning vandalism water or other casualty improper installation or application or on which the original identification marks have been removed In the USA and Canada other warranty policies may apply CAUTION United States law restricts this device to sale by or on the order of a physician ii Service Manual JE 912AK EMC RELATED CAUTION This equipment and or system complies with the International Standard IEC60601 1 2 for electromagnetic compatlibility for medical electrical equipment and or system However an electromagnetic environment that exceeds the limits or levels stipulated in the IEC60601 1 2 can cause harmful interference to the equipment and or system or cause the equipment and or system to fail to perform its intended function or degrade its intended performance Therefore during the operation of the equipment and or system if there is any undesired deviation from its intended operational performance you must avoid identify and resolve the adverse electromagnetic effect before continuing to use the equipment and or system The following describes some common interference sources and remedial actions 1 Strong e
37. ng operation or the power on self check for the PC unit To solve the problem if an error message appears find the displayed error message from the table then do the action recommended in the Action column Error Message Possible Cause Action The IMPEDANCE CHECK key on the PSG input box has been pressed When the power is turned on the IMPEDANCE CHECK key on the PSG input box is pressed or the IMPEDANCE CHECK key makes a short circuit Do not press the IMPEDANCE CHECK key when the power is turned on If the IMPEDANCE CHECK key is faulty replace the PSG INPUT board The connection between the PSG INPUT board and PSG MOTHER board is disconnected Check the cable connection If the flat cable is faulty replace it with a new one The SELECTOR key on the PSG input box was pressed during startup When the power is turned on the SELECTOR key on the PSG input box is pressed or the SELECTOR key makes a short circuit Do not press the SELECTOR key when the power is turned on If the SELECTOR key is faulty replace the PSG INPUT board The connection between the PSG INPUT board and PSG MOTHER board is disconnected Check the cable connection If the flat cable is faulty replace it with a new one USB 901 The electrode junction box has been disconnected The Acquisition program will be closed after saving the acquired data Please connect the electrode junction box and r
38. obe circulation SpO2 PULSE SEARCH Searching for correct pulse waveform Wait until the pulse waveform is detected Pulse waveform is rough and SpO2 Check the probe attachment condition cannot be measured Probe is detached from the patient Reattach the probe SpO2 NO PULSE Poor peripheral circulation Check the patient condition Remove the cause by changing the attachment site etc Probe is attached too tight and prevents Check the probe attachment condition circulation Probe is detached from the patient Reattach the probe SpO2 CHECK PROBE SITE Probe attachment site is inappropriate Refer to the probe operator s manual and attach the probe on the appropriate site Probe is past the expiration date Replace the probe with a new one SpO2 LIGHT INTERFERE The measurement site is under surgical Cover the probe with a blanket or cloth light bilirubin light sunlight etc The AC filter setting is not correct Check the AC filter setting in the System Program SpO2 PROBE FAILURE Faulty probe Replace the probe with a new one SpO2 hardware failure Faulty SpO2 adaptor Replace the SpO2 adaptor NOTE When the optional JL 951T3 SpO Adapter is connected to the PSG input box and there is an extreme power surge an SpO UNSTABLE PULSE message appears To prevent noise from the AC power line ground the electroencephalograph with a low impedance ground lead i e 1 5 m or less connect the AC power cord to an
39. other AC outlet and or turn off the power of surrounding equipment 2 8 Service Manual JE 912AK Section 3 Board Description erii mE 3 1 Seel ee 3 1 PSG INPUT Board and PSG AMP Board sse 3 2 PSG MOTHER Board eseu irr taceo pco erac dr nh erras ir Re de rk e 3 6 Settings When Using Two PSG Input Boxes a 3 8 Service Manual JE 912AK 3C 1 This page is intentionally left blank 3C 2 Service Manual JE 912AK General Block Diagram JE 914A Mini Junction Box 3 BOARD DESCRIPTION JE 912AK PSG Input Box PSG JUNCTION board PSG INPUT board PSG AMP board PSG MOTHER board 7 S T ENE abeonener E PEA H d Y o L lt To EEG 0 f i SH Card Via i tor np TO s IE t SpO2 probe DC input 8 channel Service Manual JE 912AK The PSG input box consists of the PSG INPUT board PSG AMP board and PSG MOTHER board The JE 912AK PSG input box has 4 dual DC input connectors 8 channels The general functions of the PSG input box are to amplify the polysomnogram signals picked up from the electrodes sensors SpO probe amplify the DC input signals from the DC input connectors simultaneously sample the amplified signals at the frequency of 1 kHz convert the sampled analog signals to digital serial data outp
40. r 2 0 kOF 4 99 kOF 10 0 kQF 20 0 kQF 49 9 kOF 1 Connect the EEG impedance checker to the multiple connector of the PSG input box 2 Start the Acquisition program 3 Do the skin electrode impedance check with the 5 different checkers Refer to Checking the Skin electrode Impedance in Section 5 of the EEG operator s manual Impedance checker Required Parts Description Qty Code No Resistor MRS25F2001 2 0 kOF 35 2277051 Resistor MRS25F4991 4 99 kOF 35 227434 Resistor MRS25F1002 10 0 kOF 35 227728 Resistor MRS25F2002 20 0 kQF 35 228014 Resistor MRS25F4992 49 9 kOF 35 228398 Connector PCR S50FS 1 545287 Housing PCR LS50LA 1 545394 Service Manual JE 912AK Checking the EEG Input Circuit Circuit diagram 100 Q 5 MAINTENANCE Checking the Amplifier Use the EEG input checker to check amplifiers for each electrode on the EEG input circuits on the PSG input box This checker divides the applied signals to 1 10000 Example 500 mV to 50 UV Assemble the EEG input checker locally with parts that are purchased locally or from your Nihon Kohden distributor or representative Connect the EEG input checker to the multiple connector of the PSG input box Start the Acquisition program Set the EEG instrument to the following settings High cut filter Time constant Sensitivity AC filter Montage
41. rn checker ON OFF switch START button 5 Check the montage setting on the screen Service Manual JE 912AK Service Manual The relationship between clock signal and electrode is as follows 5 MAINTENANCE Clock Signal No 1 2 3 4 5 6 7 8 9 10 Electrode Al A2 C3 C4 Ol 02 XI X2 X3 X4 Clock Signal No 11 12 13 14 15 16 17 18 19 20 Electrode X5 X6 X7 X8 X9 X10 XII X12 X13 X14 Clock Signal No 21 22 23 24 25 26 27 Electrode X15 X16 X17 X18 X19 X20 X21 The negative or positive pulse signal appears according to the montage setting for each channel The montage of the following example is G1 C3 and G2 O2 02 1 5 10 15 20 25 30 C3 When the G2 electrode is set to 0 V only the negative pulse according to the selected electrode appears for the channel Clock 16 55 17 I i Ka D e ED TD P e o gt gt Geh no m 1 10 11 12 13 14 JE 912AK 5 5 5 MAINTENANCE This page is intentionally left blank 5 6 Service Manual JE 912AK Section 6 Replaceable Parts List JE 912AK PSG Input BOXE inu eer ebat ra rue t eed aca auqa vaadata kv cd unu JE 914A Mini Junction Bos Service Manual JE 912AK 6 2 6 4 This page is intentionally left blank 6C 2 Service Manual JE 912AK Service Manual JE 912AK 6 REPLACEABLE PARTS LIST When ord
42. running the program data file in the hard disk and or MO disk may be damaged Trademarks Windows is a registered trademarks of Microsoft Corporation Service Manual JE 912AK 1 1 1 GENERAL Service Policy Service Parts and Patient Safety Checks Service Policy Service Parts 1 2 Our technical service policy for this PSG input box is to replace the faulty unit board or part or damaged mechanical part with a new one Do not perform electrical device or component level repair of the multilayer board or unit We do not support component level repair outside the factory for the following reasons Most of the boards are multilayer boards with surface mount electrical devices SMD so the mounting density of the board is too high A special tool or high degree of repair skill is required to repair the multilayer boards with SMDs Disassemble the PSG input box or replace a board or unit in an environment where the PSG input box is protected against static electricity As background knowledge for repair pay special attention to the following You can reduce the repair time by considering the problem before starting repair You can clarify the source of most of the troubles using the information from the troubleshooting tables Refer to Troubleshooting of this manual Refer to Replaceable Parts List of this manual for the service parts for technical service that we provide NOTE When ordering parts or a
43. s not selected for the storage electrode Select the electrode for the storage electrode in the Electrodes to be Saved dialog box of the System program The electrode is selected for the AV derivation but not selected for the storage electrode Select all electrodes which are selected for the AV derivation for the storage electrode in the Electrodes to be Saved dialog box of the System program The amplifier setting sensitivity time constant or high cut filter does not change with the Amp bar The amplifier setting is not set to ACC Set the amplifier setting to ACC with the pattern table in the System program You can temporarily change the amplifier setting in the Acquisition program and Review program The Acquisition program does not open When an error appears follow the instructions on the dialog box Faulty USB cable connection Turn off the power of the PC unit then check that the USB cable from the PSG input box is correctly connected to the PC unit Faulty PSG input box Replace the PSG input box 24 Service Manual JE 912AK 2 TROUBLESHOOTING AND ERROR MESSAGES Problem Possible cause Action No calibration waveform appears on the screen Artifact is superimposed on all calibration waveforms Only baselines appear on the screen No waveform appears on the screen Faulty PSG MOTHER board Replace the PSG MOTHER board or PSG inp
44. site by 2 or 3 C 4 or 5 F Periodically check the attached state of the probe and change the attachment site about every 8 hours When performing MRI tests remove the probes from the patient The local heat generated from the induced electromagnetic field may burn the patient s skin For details refer to the instruction manual for the MRI Service Manual JE 912AK 1 GENERAL CAUTION Always dry the connectors and do not let them contact liquid Otherwise SpO measurement result may be incorrect If the attachment site is dirty with blood clean it before attaching the probe If there is nail polish on the attachment site remove the polish Otherwise the amount of transmitted light decreases and measured data may be incorrect or measurement cannot be performed When measuring SpO under intense light surgical light bilirubin lamp sunlight cover the probe with a blanket or cloth Otherwise noise may interfere Turn off the power of cellular telephones small wireless devices and other devices which produce strong electromagnetic interference around a patient except for PHS telephones allowed by the hospital administrator Otherwise radio waves from devices such as cellular telephones or small wireless devices may be mistaken as pulse waves and the displayed data may be incorrect Cleaning or Disinfecting CAUTION Turn off the power before cleaning or disinfecting Otherwise you may get an electrical sho
45. t or printer is placed near the patient or electrode junction box Arrange the measurement environment so that unwanted radio frequency does not affect the measurement A desk lamp or fluorescent light is turned on Turn the desk lamp or fluorescent light off The patient touched some metal part Prevent the patient from touching metal parts The patient is using an electric blanket Turn the electric blanket off and unplug the AC power cord then use another warming method There is a cellular phone near the patient Turn the cellular phone off Service Manual JE 912AK 2 3 2 IROUBLESHOOTING AND ERROR MESSAGES Problem Possible cause Action The waveform is not stable One or more of the leads from the Z C3 and C4 input jacks are not attached to the patient Attach these leads to the patient because the Z electrode and C3 and C4 electrodes are necessary for EEG measurement New and old electrodes or different types of electrodes are used together Do not use new and old electrodes or different types of electrodes together This may cause high polarization voltage The waveform sometimes becomes flat The skin electrode contact impedance of the C3 or C4 is high Clean the electrode attachment to reduce the impedance and reattach the electrode During waveform acquisition the following message appears The disk is full Close the current fil
46. th other instruments to avoid misdiagnosis or other problems 5 All circuitry used for direct patient connection must be doubly checked 6 Check that battery level is acceptable and battery condition is good when using battery operated models 4 During Operation 1 Both the instrument and the patient must receive continual careful attention 2 Turn power off or remove electrodes and or transducers when necessary to assure the patient s safety 3 Avoid direct contact between the instrument housing and the patient 5 To Shutdown After Use 1 Turn power off with all controls returned to their original positions 2 Remove the cords gently do not use force to remove them 3 Clean the instrument together with all accessories for their next use 6 Theinstrument must receive expert professional attention for maintenance and repairs When the instrument is not functioning properly it should be clearly marked to avoid operation while it is out of order 7 The instrument must not be altered or modified in any way 8 Maintenance and Inspection 1 The instrument and parts must undergo regular maintenance inspection at least every 6 months 2 If stored for extended periods without being used make sure prior to operation that the instrument is in perfect operating condition Service Manual JE 912AK 3 Technical information such as parts list descriptions calibration instructions or other information is available for
47. to Upgrading the EEG System Program in Section 2 Service Manual JE 912AK Specifications Amplifier Number of input Jacks EEG inputs Extra inputs Bipolar inputs Respiration inputs DC inputs Position sensor input SpO adaptor input Input impedance Input circuit current Internal noise level CMRR Gain Low cut filter High cut filter Offset torelance A D conversion Sampling and hold Sampling frequency Safety Safety standard Type of protection against electric shock 6 14 14 3 RESP F flow RESP C chest RESP A abdomen 8 1 1 100 MQ Less than 5 nA Less than 1 5 uVp p 0 53 to 60 Hz 105 dB or greater at 60 Hz bipolar input 60 dB or greater x469 73 0 08 Hz TC 2 s 120 Hz 18 dB oct 600 mV 16 bits 97 nV LSB All electrodes at a time 100 200 500 Hz IEC 60601 1 1988 IEC 60601 1 Amendment 1 1991 IEC 60601 1 Amendment 2 1995 IEC 60601 2 26 1994 EN 60601 1 1 1992 06 with AMI 1995 EEG 9200 electroencephalograph Degree of protection against electric shock Electrode jacks respiration jacks SpO connector Degree of protection against harmful ingress of water Degree of safety of application in flammable gas Mode of operation Electromagnetic Compatibility Dimensions and Weight JE 912AK JE 914A Service Manual JE 912AK Type BF applied part Not protected IPXO 1 GENERAL Class I when connecting to the EEG 1100 EEG 9100
48. ual JE 912AK 1 GENERAL Introduction The JE 912AK PSG Input Box is an electrode junction box to measure polysomnogram The PSG input box communicates with an electroencephalograph by USB communication Up to 8 DC signals and SpO can be measured This service manual provides useful information to qualified service personnel to understand troubleshoot service maintain and repair this JE 912AK PSG Input Box All replaceable parts or units of this instrument and its optional units are clearly listed with exploded illustrations to help you locate the parts quickly The Maintenance section in this service manual only describes the maintenance that should be performed by qualified service personnel The Maintenance section in the operator s manual describes the maintenance that can be performed by the user The information in the operator s manual is primarily for the user However it is important for service personnel to thoroughly read the operator s manual and service manual before starting to troubleshoot service maintain or repair this instrument This is because service personnel need to understand the operation of the instrument in order to effectively use the information in the service manual CAUTION To turn the power off follow the procedure in Power Off Procedure in Section 3 of the EEG operator s manual Do not press the power button on the PC unit If the power button is pressed while a program is
49. usly controls the reset circuits of all the amplifiers in the PSG input box Controls the impedance check function The skin electrode contact impedance is calculated and the check result is displayed on the LEDs on the PSG INPUT board and sent to the PC unit Power Supply Circuit On the non floating circuit 5 V Power supply from the PC unit 3 3V Power supply for digital circuits 1 8 V Power supply for CARD E09A On the floating circuit The following powers are generated by the DC DC converter 5 VF Power supply for floating circuits Isolation Circuits The photocouplers are used for transferring the digital data from the floating circuit to the non floating circuit A D Conversion Control Circuit Impedance Check Control Circuit A D conversion control circuit Convert the analog EEG signals sensor signals and DC input signals into digital signals First the analog signal is sampled and held Second the sampled and held data is multiplexed Third the multiplexed data is converted into digital EEG signals with a 16 bit A D converter Impedance check control circuit The impedance check current is generated by an 8 bit D A converter USB Communication Control Circuit Controls the communication between the PSG input box and PC unit J012 Jumper Switch This switch sets the ID number of the PSG input box Short 1 default setting Open 2 Service Manual JE 912AK 3 7 3 BOARD DESCRIPTION Settings When Usin
50. ut box Artifact is superimposed on all signals input from the electrode jacks Faulty PSG MOTHER board if no SELECTOR Impedance threshold display LED on the PSG input box lights Replace the PSG MOTHER board or PSG input box Faulty PSG INPUT board Replace the PSG INPUT board Faulty PSG AMP board Replace the PSG AMP board A specific electrode signal does not appear Faulty electrode lead Replace the electrode lead Faulty PSG INPUT board Replace the PSG INPUT board Faulty PSG AMP board An amplifier corresponding to the signal is faulty Replace the PSG AMP board or PSG input box Artifact is superimposed on a specific electrode signal Faulty electrode lead Replace the electrode lead Faulty electrode jack on the mini junction box Replace the PSG JUNCTION board or mini junction box Faulty PSG INPUT board An amplifier corresponding to the signal is faulty Replace the PSG INPUT board or PSG input box Faulty PSG AMP board An amplifier corresponding to the signal is faulty Replace the PSG AMP board or PSG input box No DC input signal appears on the screen Artifact is superimposed on all DC input signals Faulty PSG AMP board Replace the PSG AMP board or PSG input box A specific DC input signal does not appear on the screen Artifact is superimposed on a specific DC input signal Faulty PSG AMP board An ampl
51. ut the digital data to the PC unit by USB communication measure the skin electrode contact impedance and display the skin electrode contact impedance with the LEDs 3 1 3 BOARD DESCRIPTION PSG INPUT Board and PSG AMP Board el 010d ol 90 sxoolq 9 6uneolj uoN ANSV 6uneolj uoN T MO3HO H GY axvaxy AS GL ZPNO PJ809 H3H LOIN 9Sd W014 011409 XdW p1e09 YAHLOW 9Sd 3 U1O13 yoayo ouep dui xoq uonouf iuju UO ONE uonisod Apog N3NWOd8V 1S3HO MOTH NAWOGAV LS3HO MOIS 40 849019 EX ANDY kex O1 61X LX 01 6LX 40 syoolq x Lex 01 61X ANDY 81X or SIX 81X 01 SLX 40 SYDOIG EX 81X OL GLX Jeydwe z B ou 1 J 1 SON e LS piou pue ajdwes x lt x LL te ue pleog dINV DSd yo y ouep duu ANDY 8x ule PLX OL LX ZO LO ZY Lu 40 90d 8 pO FIX O LX ZO LO ev LY O 0f NO pleog INNI 9Sd Service Manual JE 912AK 3 2 PSG INPUT board Service Manual JE 912AK 3 BOARD D
52. vice is intended for use only by qualified medical personnel Use only Nihon Kohden approved products with this device Use of non approved products or in a non approved manner may affect the performance specifications of the device This includes but is not limited to batteries recording paper pens extension cables electrode leads input boxes and AC power Please read these precautions thoroughly before attempting to operate the instrument 1 Tosafely and effectively use the instrument its operation must be fully understood 2 When installing or storing the instrument take the following precautions 1 Avoid moisture or contact with water dust extreme atmospheric pressure excessive humidity and temperatures poorly ventilated areas and saline or sulphuric air 2 Place the instrument on an even level floor Avoid vibration and mechanical shock even during transport 3 Avoid placing in an area where chemicals are stored or where there is danger of gas leakage 4 The power line source to be applied to the instrument must correspond in frequency and voltage to product specifications and have sufficient current capacity 5 Choose a room where a proper grounding facility is available 3 Before Operation 1 Check that the instrument is in perfect operating order 2 Check that the instrument is grounded properly 3 Check that all cords are connected properly 4 Pay extra attention when the instrument is in combination wi
53. x UT 0730 PSG JUNCTION board di 1 16 Service Manual JE 912AK Section 2 Troubleshooting and Error Messages How Iroubleshodtk seum tp 2 1 Closing the Program and Shutting Down Windows ssseseseseseeeeeeeerreesseene 2 2 TrOUbleshodtng Ro 2 3 Waveform Acquisition rrrnnnnnnvnnnnnnnnnnnvnnnnnnnnnnnvnnnnnnnnnnnvnnnnannennnvnnenannnnnnnnnenennnnnnnnneee 2 3 rm mala A E A E 2 6 Error Messages u n eselet een 2 7 AcquisrionmiProgr am EE 2 7 SPO uci e Qhi sma s sss 2 8 Service Manual JE 912AK 2C 1 This page is intentionally left blank 2C 2 Service Manual JE 912AK How to Troubleshoot Service Manual JE 912AK 2 TROUBLESHOOTING AND ERROR MESSAGES Use this section to locate identify and solve a problem in the PSG input box or an error message displayed on the screen The troubleshooting tables in this section are divided into general problems and displayed error messages Determine which troubleshooting table to use 2 Inthe Problem or Error Message column find the trouble item that matches the problem or error message 3 Do the action recommended in the Action column Do the first action recommended in the Action column 4 Ifthe problem or error message is not solved do the next action recommended in the Action column If this does not solve the problem do the next recommended sections 5 Ifnone of the actions solve the problem contact your Nihon

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