Teca Nervus EEG Service Guide
Contents
1. 0 000 a etern 11 1 7 Nervus C64 C32 amplifier 0 aeta err 11 1 8 Nervus U32 amplifier 0 0000 13 1 9 Photic StimUlatorsis st intense 13 1 10 Videum 1000 video capture card 14 2 System functional checks 15 2 1 Equipment required 15 2 2 Setting the system up for checking 000ae eaten 15 2 3 Basic functionality checks rnranrnnnrnnorrnonrnnnrrnerrnrrrrnnrrnnrrnerrnrnrennn 16 2 4 Amplifier checks 17 2 5 Recording CHECKS REE EEE 22 2 6 Review Checks i cesse Ronnie mia dee eae near ion 24 2 7 Printer checks escent deal ae dn 24 2 8 Audio checks sis 25 2 9 CD Writer cheeks unna nede 25 2 10 DVD Writer CHECKS sus 25 2 11 Removing test files 26 3 Fault finding AT A EA nenna 27 Nervus Service Manual vi 3 1 Hardware and Windows problems 27 3 2 Nervus applications software problems 28 Maintenance sn Akbar 33 4 1 Routine maintenance issus 33 42 ClEaNiN Sinisa ieee te eee E 33 4 3 Backing Up data ss donne signer Leese veies 34 Servicing the Nervus 35 5 1 Nervus Notebook PC iii 35 5 2 Nervus Desktop PC iii 36 5 3 Nervus amplifiers and IBOX 36 5 4 Nervus medical power supply 000eeere een 36 Technical information Erro2. 7 Index Acquisition system outline 3 Amplifer servicing 36 Amplifier checks 17 Amplifier connectors 39 Applications problems 28 Audio checks 25 Backing up data 34 35 C64 C32 input output connectors 12 C64 C32 amplifier 11 Calibration checks 18 CD Writer checks 25 Checking system setup 15 Checking basic functionality 17 Checking power connections 16 Checks amplifier 17 amplifier signal 17 audio 25 calibration 18 CD Writer 25 Common Mode rejection 20 DVD Writer 25 electrode impedance 21 noise 20 photic flash rate 23 photic intensity 23 printer 24 recording 22 review 24 Cleaning equipment 34 optical disks 34 Common Mode rejection checks 20 Connecting C64 C32 amplifier 12 IBox 10 U32 amplifier 13 USB interface card 8 Connecting the systems 4 Connectors 39 Data backup 34 DVD Writer checks 25 EEG inputs M40 38 Electrode board connectors 11 Electrode impedance check 21 Event marker 11 Fault finding 27 Function tests 15 Fuses 6 Hardware problems 27 IBox input output connectors 10 interface 10 servicing 36 Impedance check 11 Input output connectors 9 10 C64 C32 12 ISB O60W 8 ISB O60W isolating transformer fuses 7 voltage 6 IS01000 8 IS01000 isolating transformer fuses 6 voltage 6 Isolating transformers 8 M40 EEG inputs 38 polygraphy inputs 38 signal conversion 38 M40 amplifier 11 Mains supplies 4 Maintena
3. Select Tools Start Photic from the Recorder menu to start a sequence where the photic will flash continuously whilst increasing the flash intensity every three seconds Verify that the photic intensity gradually increases as it runs through the sequence Photic flash rate 1 Select Protocol Settings from the Recorder menu then click on Photic at the bottom of the Montage Editor window that appears Select the Rate entry from the Photic Sequences list box and click on Apply Close the Photic Editor window 23 Nervus Service Manual Select Tools Start Photic from the Recorder menu to start a sequence where the photic will flash continuously whilst increasing the flash frequency every three seconds Verify that the flash rate increases as it runs through the sequence Close the Recorder ensuring that the file is registered and return to the Study Room 2 6 Review checks 1 8 Highlight the test recording in the Study Room Record List and click on Review If the Panel is not visible then select View Panel Show from the Reader menu Set the Paging Speed to maximum If the system has videometry and the video window is not visible then click on the lt symbol on the left of the Video entry in the Panel to view the video window If video is present click on the playback icon at the bottom of the video window otherwise click on the playback icon on the Reader toolbar Verify that the traces wipe smooth
4. refer to Windows is not loaded at switch on documentation Hard disk is faulty IDE interface on PC motherboard is faulty BIOS settings on the PC motherboard have changed Error messages displayed System does not recognise a hardware or software during start up sequence configuration refer to the Windows documentation or on line help Windows or application software has become corrupted Screen goes blank when e Screen resolution or refresh rate is set too high for monitor Windows has started start Windows in Safe Mode and change the resolution refer to Windows documentation Mouse pointer inoperative e Mouse is not connected e Mouse is faulty 27 Nervus Service Manual Windows has not recognised the device at switch on Mouse driver software has become corrupted Interface on PC motherboard is faulty Keyboard inoperative Keyboard is not connected Keyboard is faulty Windows has not recognised the keyboard at switch on Keyboard driver software has become corrupted Interface on PC motherboard is faulty Amplifier power LED not LED faulty illuminated Amplifier cable faulty or not attached correctly Amplifier faulty Splitter amplifier cable faulty or not attached correctly Medical power supply is faulty or not connected USB Interface card is faulty IBox is faulty 3 2 Nervus applications software problems Problems with installing the Nervus software Problem criteria Probable caus
5. Cut filter to 70Hz on all channels Click the Preview button on the Recorder toolbar to start acquiring data without actually recording it A trace should be seen wiping across the display Click the Stop button on the Recorder toolbar after a few seconds and verify that the noise displayed on each trace is less than 2uV pk pk It may be necessary to move the amplifier away from sources of electrical noise such as the mains cables System functional checks Common Mode rejection checks Ensure the system is pre configured as described in section 2 2 1 Short together the monopolar inputs the bipolar inputs and the REF R input on the amplifier 2 Set the Signal Generator to give a 2V pk pk sine wave output at the local mains supply frequency 50Hz or 60Hz 3 Connect one terminal of the generator to the shorted inputs and the other terminal to the NEUT N input 4 Set the Sensitivity to 10uV cm Edit the montage to enable all channels that use monopolar inputs and disable all other channels 6 Click the Preview button on the Recorder toolbar to start acquiring data without actually recording it A trace should be seen wiping across the display 7 Click the Stop button on the Recorder toolbar after a few seconds and verify that all traces have an amplitude of less than 6uV pk pk indicating a CMRR of gt 110dB Bipolar inputs These checks do not need to be performed on the Nervus 64 amplifier as there are n
6. also an SMPSU that supplies the power for the Nervus amplifier The output voltage of the SMPSU can be set to either 5 6V or 6 3V Jumper link HDR1 controls the selection of the output voltage with the link fitted the output is 5 6V and with no link fitted the output is 6 3V The higher voltage should be selected if the card is to be fitted to a 128 channel system or if a Nervus amplifier is to be used with a long cable run Input output connectors 26 way auxiliary non isolated Input output connector Four auxiliary These signals must be referenced to non isolated analogue input ground channels Can be put to a variety of uses for example the signal from a SaO2 monitor patient movement or light sensor Auxiliary digital Can typically be used to trigger from or to an inputs outputs external device such as a photic stimulator The 032D014 cable assembly a 26 way D type high density plug to 6 BNC plugs can be used to interface with these inputs and outputs Nervus Service Manual 1 5 IBox interface An IBox is essentially a USB Interface card inside a box to make it self contained The IBox interface must be powered from the special medical power supply This supply may be directly connected to a fixed mains socket outlet and supplies 15Vdc to the IBox Connecting the IBox IBox to PC The IBox has a cable connecting it to the USB input of the PC This cable is the only data link with the PC also providing con
7. normally powered from an isolating transformer however if required it may be connected directly to a separate mains socket outlet The photic interfaces with Nervus systems via a single 15 way D sub connector on the rear panel The interface utilises differential line drivers 13 Nervus Service Manual and receivers to ensure reliable data transfer between the photic and the system The photic stimulator contains two circuit boards Micro controller The micro controller board provides the communication and control interfaces that allow the Nervus system to control the operation of the photic Photic The photic board controls the flash intensity and flash rate of the photic stimulator 1 10 Videum 1000 video capture card The Videum 1000 card is used only in videometry systems The card allows audio and video to be captured from any external audio and video sources and stored to disk in AVI format Video can be captured from either PAL or NTSC video sources The card can be configured to capture video at up to 30 frames per second in image sizes ranging from 32x24 to 640x480 Audio capture can be configured for 8 bit and 16 bit mono or stereo The audio sampling rate can be set at 11 22 or 44khz For Nervus the typical setup is 320 240 15 25 frames S depending on the specification of the PC and the hard drive storage space available With its audio capabilities full duplex guaranteed synchronised with vid
8. resistor and a 10k0 1 resistor in series across the signal output connectors as shown in Figure 1 This will attenuate the Signal Generator to a level 1mV pk pk which can be applied directly to the inputs of a Nervus amplifier 100m pk pk EE Tot pk pk signal ELITE Signal 10kU ont Figure 1 Signal attenuator 17 Nervus Service Manual Monopolar inputs 1 5 Connect the 1mV signal from the attenuator circuit to one of the monopolar inputs on the amplifier connecting the signal ground to the REF R and NEUT N sockets joined together Click the Preview button on the Recorder toolbar to start acquiring data without actually recording it A trace should be seen wiping across the display Click the Stop button on the Recorder toolbar after a few seconds and verify that the trace shows a sine wave of 1mV pk pk amplitude Note If the screen settings have been entered correctly for the monitor being used a 1mV pk pk signal should be physically measurable on the screen as 1cm in amplitude Edit the montage to disable the current channel and enable another channel that uses a monopolar input Connect the 1mv signal to the appropriate monopolar input Repeat steps 2 to 4 until all monopolar inputs have been tested Bipolar inputs These checks do not need to be performed on the Nervus 64 amplifier as there are no dedicated bipolar inputs on this amplifier monopolar inputs are paired together to act a
9. supply ISB 060W supply voltage selection The ISB 060W isolating transformer is configurable for either 115V or 230V operation Refer to the instructions supplied for details on selecting the supply voltage Before connecting it to the mains supply and connecting the PC etc to its isolated outputs ensure that both the input and output supply voltages are set to match the mains supply voltage If they are not correctly set they must be changed before connecting the isolation transformer to the mains supply Mains fuses PCs and PC peripherals The internal PC power supplies for the Nervus Desktop Notebook PCs and the monitors have internal mains fuses These are not user accessible Should a failure be suspected seek advice from the service organisation of the manufacturer of the device 1SO1000 The IS01000 isolating transformer has two mains fuses F1 and F2 located in the mains inlet connector They must be of the correct type and rating as stated on the label next to the mains inlet connector The isolating transformer mains fuse values must correspond to those required by the local mains supply voltage The required fuse values are shown in the following table Technical overview Mains voltage Fuse rating 100 120V T10A H 250V 200 240V T6 3A H 250V Fuses are HIGH BREAKING CAPACITY type If either fuse in the isolating transformer fails shortly after replacement a fault is indicated and a qualified el
10. the Nervus systems Videum 1000 video capture card Video formats NTSC or PAL Video connectors Composite phono S video and MXC Capture formats RGB8 8 bit RGB 256 colours RGBH 16 bit RGB 64K colours RGBT 24 bit RGB 16 8M colours Image size 32x24 to 640x480 NTSC 32x24 to 704x576 PAL 640x480 30 fps uncompressed NTSC Performance 704x576 25 fps uncompressed PAL Audio 8 bit and 16 bit mono or stereo 11 22 and 44 kHz multimedia Sampling rates Full duplex at all sampling rates Audio output Speaker out 3 5mm jack Stereo Auxin 3 5mm jack Audio inputs Stereo Line Mic In 3 5mm jack Mono Camera Mic In on MXC connector Dimensions 122mm L x 100mm H 37 Nervus Service Manual 6 2 Amplifier function The amplifier is attached to the RS422 link Data transfer to and from the amplifier is made via differential line drivers and receivers Using differential signals to transfer data between the PC and amplifier ensures reliable data transfer A micro controller controls the operation of the amplifier with its boot code being stored in an EPROM In response to commands from the PC the micro controller controls sample rates calibration signals electrode impedance checking polygraphy channel configuration and so on and also manages the data packet protocol to and from the amplifier EEG inputs Patient signals are routed through an input switching stage to the input amplifier The r
11. Calibration from the Recorder menu Set the Sensitivity to 100uV cm Click the Preview button on the Recorder toolbar to start acquiring data without actually recording it A trace should be seen wiping across the display Click the Stop button on the Recorder toolbar after a few seconds and verify that the trace on the channel under test shows a differentiated square wave of 1mV pk pk amplitude Note If the screen settings have been entered correctly for the monitor being used a 1mV pk pk signal should be physically measurable on the screen as 1cm in amplitude Edit the montage to disable the current channel and enable another channel that uses a monopolar input Repeat steps 3 to 5 until all monopolar inputs have been tested Bipolar inputs 1 Edit the montage to enable the first channel that uses a bipolar input and disable all other channels Select Preview from the Recorder menu Set the Sensitivity of the channel to 1000 V cm Click the Preview button on the Recorder toolbar to start acquiring data without actually recording it A trace should be seen wiping across the display Click the Stop button on the Recorder toolbar after a few seconds and verify that the trace on the channel under test shows a differentiated square wave of 1mV pk pk amplitude Note If the screen settings have been entered correctly for the monitor being used a 1mV pk pk signal should be physically measurable on the screen as 1cm in amplitud
12. NERVUS J 30 Service Guide MANOO3 EA EEG Service Guide MANOO3 Taugagreining hf Armuli 10 108 Reykjavik Iceland Tel 354 580 7500 Fax 354 580 7501 www nervus is info nervus is Using this manual The Nervus range of Multimedia EEG systems has been designed and manu factured by Taugagreining hf an Icelandic company that has always had an enviable reputation for innovation and quality of its products Taugagreining hf has been certified by SEMKO as an approved medical devices manufacturer as meeting the requirements of the Medical Devices Directive 93 42 EEC Taugagreining hf quality management system has been certified by SEMKO DEKRA to comply with ISO 9001 2000 The Nervus range of EEG systems has been independently tested and successfully approved to the following medical safety standards EN 60601 1 EN 60601 1 2 IEC 601 1 IEC 601 1 2 UL 2601 1 CAN CSA C22 2 No 601 1 M90 JIS T 1001 JIS T 1002 or JIS T 0601 1 C The Nervus range of EEG systems is CE Marked in 0413 accordance with the European Council Directive 93 42 EEC concerning medical devices Caution in the USA federal law restricts this device to sale by or on the order of a physician Nervus Service Manual Copyright All rights reserved This manual contains proprietary information which is protected by copyright and may not be copied in whole or in part except with the prior written permission of Taugagreining hf T
13. R2 2 and buffered digital I P P3 3 Technical information 8 P3 1 InvOP HDR2 5 Issue 1 amp 2 Issue 2 only open collector pull up to 5V inverted version of P3 1 can be used as Serial O P Must be pulled down to 12V for RS232 purposes 9 Issue 1 HDR2 1 Issue 1 amp 2 Issue 2 only 8x930Ax 5V power U 5V Issue Note in bus powered mode this is USB power so 2 current drawn is lt 500mA total Only ever apply external 5V power to this pin if the USBIFB 01 is in self powered mode 10 Al2 IP Analog I P Channel 2 2 5V fsd 11 AI4 IP Analog I P Channel 4 2 5V fsd 12 HDR2 24 13 HDR2 21 14 HDR2 17 15 Horan 16 HDR2 8 amp 9 OV 17 HDR2 7 18 P1 0 OP HDR2 3 and open drain buffered version of P1 0 current limited by series 1000 resistor Issue 1 amp 2 Issue 2 only 4K7Q pull up to D 5V 19 Al3 IP Analog I P Channel 3 2 5V fsd 20 HDR2M8 21 1 HDR2 16 22 1 HDR2 14 23 san 24 HDR210 25 HDR2 6 26 P3 0 InvIP HDR2 4 Issue 1 amp 2 Issue 2 only buffered inverted version connected to P3 0 can be used as Serial I P Shell GND Ground 41 Nervus Service Manual C64 amplifier 5 pin mini circular connector pin out one digital input per 16 channels Pin Signal Signal name description 1 D1 Digital input 2 3 4 5 GND Ground 42 Index
14. age selection on page 5 For the Notebook PC check the rating label and its user manual to see if any adjustment is required PC Desktop supply voltage selection Refer to the user manual supplied with the PC Desktop PC Monitor supply voltage selection Refer to the user manual supplied with the PC Monitor Photic supply voltage selection 1 Check that the ac mains supply voltage indicated by the slide switch next to the mains inlet connector at the rear of the photic is correct for the local ac mains supply 2 If it is not correct it must be changed before connecting to the mains supply The slide switch has two positions 115V and 230V and the actuator should be set so that it is adjacent to the required voltage setting Nervus Service Manual The mains selector switch should never be operated when the equipment is connected to the mains supply See the printed value on the end panel of the photic for the fuse rating 1501000 supply voltage selection The 1SO1000 isolating transformer is user adjustable to either 100 120V or 200 240V operation Refer to the instructions supplied for details on selecting the supply voltage Before connecting it to the mains supply and connecting the PC etc to its isolated outputs ensure that both the input and output supply voltages are set to match the mains supply voltage If they are not correctly set they must be changed before connecting the isolation transformer to the mains
15. al format displayed on the screen with the EEG data and at the same time stored to the Recarea alongside the Raw EEG data but moved to Workarea during the recording When the data acquisition is finished the recorded EEG data and video data if present is registered moved to a unique sub folder in a centralised location known as the Workarea which is used for storing data from completed recordings The Workarea like the Recarea can either be located on the hard drive of the recording unit or in the case of a networked system on the hard drive of a server somewhere on the network NOTE If recordings are made on a networked acquisition system that has been temporarily disconnected from the network then the recordings cannot be transferred to the central Workarea when the recording is complete Under these circumstances recordings are stored locally until the acquisition unit is reconnected to the network at which time the system will automatically transfer any local recordings to the centralised Workarea Nervus Service Manual The EEG data and video file stored in the Workarea can be reviewed on the acquisition system or in the case of a networked system on any other Nervus system attached to the network Several Nervus systems can simultaneously view the same EEG file however only one system the one which opened it first can edit the file The Nervus Reader defaults to viewing the data as it was recorded how
16. available from the PC manufacturer via their website 5 3 Nervus amplifiers and IBox Due to the number of small surface mounted components in the Nervus amplifiers and IBox there are no serviceable parts in these units Refer to System functional checks on page 15 Fault finding on page 27 and Technical overview on page 3 to establish if the cause of the problem lies in the Nervus amplifiers or IBox If so exchange units are available from Taugagreining hf or their distributors and agents 5 4 Nervus medical power supply There are no serviceable parts with this supply Refer to System functional checks on page 15 Fault finding on page 27 and Technical overview on page 3 to establish if the cause of the problem lies in the supply If so replacements are available from Taugagreining hf or their distributors and agents 36 Technical information 6 Technical information 6 1 Technical Specifications Sizes and weights For the sizes and weights of the Desktop and Notebook PCs refer to the relevant manufacturer s User Manual Please refer to the Specifications chapter of the Nervus User Manual for the sizes and weights of the Nervus amplifiers and photic stimulator Desktop PC or Notebook PC specifications Both Desktop and Notebook PCs approved and supplied by Taugagreining hf will vary as newer and higher specification models appear please refer to the Nervus User Manual for the minimum specification of the PCs used in
17. e 19 Nervus Service Manual 5 6 Edit the montage to disable the current channel and enable another channel that uses a bipolar input Repeat steps 3 to 5 until all bipolar inputs have been tested Noise checks Ensure that the system is pre configured as described in section 2 2 and that the signal generator is not connected to the amplifier Monopolar inputs 1 2 Set the Sensitivity to 10 V cm and the High Cut filter to 70Hz Short together the monopolar inputs the bipolar inputs the NEUT N input and the REF R input on the amplifier Edit the montage to enable all channels that use monopolar inputs and disable all other channels Click the Preview button on the Recorder toolbar to start acquiring data without actually recording it trace should be seen wiping across the display Click the Stop button on the Recorder toolbar after a few seconds and verify that the noise displayed on each trace is less than 2uV pk pk It may be necessary to move the amplifier away from sources of electrical noise such as the mains cables Bipolar inputs These checks do not need to be performed on the Nervus 64 amplifier as there are no dedicated bipolar inputs on this amplifier monopolar inputs are paired together to act as bipolar inputs on this amplifier 1 20 Edit the montage to enable all channels that use bipolar inputs and disable all other channels Set the Sensitivity to 10uV cm and the High
18. e solution Setup exits with an Out of disk space Check that you have enough error disk space on the drive where the Nervus software is to be installed and on the drive containing the temporary files folder Database not System files updated Restart the computer upgraded during during installation setup and computer needs rebooting Setup reports Logged on user does Make sure the logged on registry errors not have user has administrator rights administrator rights Setup locks up part Installing a Possible network Cancel installation and try of the way through networked problems again the installation workstation 28 Fault finding Problems running Study Room Problem criteria probable cause solution Nervus logon not displayed at start up Error You do not have a license to run this program reported Data not visible in Study Room should contain data Study Room displays Local Database in the lower right corner even when computer is connected to Network Unable to create new test users in Study Room Recording has been completed but Study Room entry has not been updated Unable to move tests between tabs Study Room administrator not able to delete tests When Study Room is launched automatically at startup Has installed a networked workstation Has installed a networked workstation Test shown with recording duration of 00 00 00 and label
19. e calibration signal is connected via the reference amplifier to the negative input Signal conversion Each block of four inputs has a four channel ADC that converts the analogue signals into a single serial data stream This is done in sync on all 38 Technical information channels The serial output from the first ADC is input to the second ADC The combined serial data stream output from the second ADC is input to the third and so on so that the last ADC outputs a serial stream containing data for all channels This serial data stream is input to the micro controller via an opto coupler then returned within the serial data stream to the PC where the Recorder software processes this information to enable the dat to be displayed as traces on the PC monitor 6 3 Interface connections Amplifier connectors The following tables list the pin out details of the connectors on the amplifier Patient E Cap 25 way D type socket Left Right Right Left Configuration Configuration Fp1 F P pa T Fp2 F4 4 P4 2 F8 4 6 Fz C C moo o o Je o e aoo Ja o e O jis Jo ft a 39 Nervus Service Manual Cable Connector 15 way D sub plug DRO o O TFSO 5V 26 pin high density D type connector pin out USBIFB 01 interface card IBox or NERVUS32 amplifier Pin Signal Name Signal Description AI1 IP Analog I P Channel 1 2 5V fsd HDR2 22 HDR2 23 HDR2 19 HDR2 15 HDR2 11 HD
20. ectronic technician should be consulted to trace and repair the fault ISB 060W The ISB 060W isolating transformer has two mains fuses located in the mains inlet connector They must be of the correct type and rating as stated on the label next to the mains inlet connector The isolating transformer mains fuse values must correspond to those required by the local mains supply voltage The required fuse values are shown in the following table Mains voltage Fuse rating T6 3A L 250V T3 15A L 250V Fuses are LOW BREAKING CAPACITY type Photic The photic has two mains fuses F1 and F2 located near the mains inlet connector They must be of the correct type and rating as stated on the label next to the mains inlet connector The fuses may be removed by inserting a wide flat bladed screwdriver or thin coin in the slot and turning it anti clockwise 90 until the spring loaded fuse holder pops out The two fuses have the same rating and it is the same for all supply voltages Mains voltage Fuse rating 115V 230V T500mA L 250V Fuses are LOW BREAKING CAPACITY type Medical Power Supply The Medical Power Supply is used in the Nervus Notebook systems Nervus Service Manual The medical power supply operates from mains inputs from 100V to 240V 47 63Hz The maximum mains input current is 2A and it provides an isolated dc output of 15V 6A Isolating transformers Isolating transformers are used in the Nervus systems as
21. ed control circuits Amplifier to photic The Nervus photic stimulator uses the other connection on the splitter lead to connect to the USB interface card Amplifier to patient electrodes Signals from the patient electrodes are connected to the touch proof connector block This connector block has a set of multi way connectors and can be unplugged from the compact amplifier if required Patient signals from the connector block are passed to the inputs of the four 16 channel mini amplifier boards These amplifiers have a gain of 500 with some Low frequency band pass filtering The amplified signal is then digitised by the 22 bit ADC There is one ADC per channel Other input output connectors Multi way connector Supports other input signals These can be passed through the amplifier control board to become part of the signal sent the USB interface card then the PC s USB port 3 5mm jack socket Supports Patient Event button This event signal is passed through the interface board to become part of the signal sent to the PC s USB port Auxiliary digital inputs Can typically be used to trigger from or to an and outputs external device such as a photic stimulator Technical overview 1 8 Nervus U32 amplifier The Nervus U32 amplifier places all the functionality of an EEG amplifier and USB interface board in the same housing and is therefore well suited for use with Notebooks The amplifier has 32 EEG input channels with Refere
22. ed er as read Check user has write access permissions on Workarea Select EEG with Less than 1 second Select more than 1 frequency of data selected second of data graticule no frequency graph appears 31 Nervus Service Manual 32 Maintenance 4 Maintenance 4 1 Routine maintenance A There are no user serviceable parts inside the instrument Only appropriately trained and qualified personnel should adjust maintain or repair the instrument when it is connected to the electricity supply The instrument must be disconnected from the electricity supply first before any cover is removed The Nervus system contains many solid state electronic components which need no maintenance and have no parts requiring periodic replacement Furthermore most hardware components of the Nervus system are standard PC components They should be maintained according to the relevant manufacturer s directions All Nervus systems should be checked regularly to ensure that the connecting cables are securely attached In addition all cables especially amplifier and photic data cables should be regularly checked for signs of wear and tear Any cable showing signs of damage should be replaced immediately to ensure continuous reliable operation of the system The Notebook PC must be powered only by the model of power supply originally supplied with the system by Taugagreining hf Note that the use of other models of power supply fro
23. edance check test and for selecting the Impedance check level LEDs The results of the Impedance Check are returned from the PC via the amplifier board and LEDs illuminate to give a pass fail indication against the set level 1 7 Nervus C64 C32 amplifier The Nervus C64 C32 amplifier variant has similar functionality to the Nervus M40 amplifier though it is far smaller and can easily be worn by the patient for long periods The amplifier has 64 C32 EEG input channels with Reference and Neutral inputs Of these 64 32 channels 32 16 can be configured as bipolar polygraphy input channels C64 and C32 amplifier are used with LTM systems The amplifier has the following internal boards e Compact amplifier control board e 2or4X 16 channel amplifier boards 11 Nervus Service Manual The amplifier receives low voltage dc power from the USB Interface card which is in the PC Desktop Connecting the Nervus C64 C32 amplifier PC to mains The PC Desktop must be connected to the mains via the Isolation Transformer Amplifier to PC The C64 C32 amplifier has a single cable connecting it to the splitter cable which in turn connects to the USB interface card The cable provides the RS422 data link control signals and dc power for the amplifier There is an optically coupled voltage converter on the compact amplifier control board This provides the isolated 5V dc and isolated 5V dc to the power the patient amplifiers and associat
24. eference input is buffered to provide a common reference for all channels and is adjustable for optimum CMR The Neutral electrode is of the driven ground type and is derived from the patient reference input This technique considerably boosts the CMRR of the overall amplifier The amplified EEG signal is then routed through a filtered deblocking stage and then amplified again before being digitised When Impedance Check is selected a signal is fed to the EEG channel inputs causing it to be attenuated by the impedance of the patient This attenuated signal is then routed through the normal amplifier system and is processed by the Recorder software in the PC to determine the level of electrode impedance When Calibration mode is selected only M40 and M24 the EEG and reference inputs are grounded and the calibration signal is routed through the reference amplifier to all EEG amplifier inputs to feed the signal through the normal amplifier system Polygraphy inputs The polygraphy channels have bi polar inputs that are routed through an input switching stage to the input amplifier The differential signal is then passed through a filtered deblocking stage and the amplifier again before being digitised Polygraphy channels have a dc filter setting created by an analogue switch that connects across the filtered deblocking stage When Calibration mode is selected only M40 and M24 the positive input for each channel is grounded while th
25. el before recording into a new one Replace items as necessary one at a time and try again Replace items as necessary one at a time and try again Replace splitter cable USB Interface card is faulty Nervus 32 amplifier is faulty Fault finding O O PE CT HE Montage label No traces The channel s Close the file and select appears in red present is are not selected the channel before in the amplifier recording into a new one setup There is a lot of No noise on The electrode s on Fix the electrode or noise on a other channels this channel may remove it from the channel have bad amplifier setup contact s to the patient or be free floating picking up noise from the surroundings The message The amplifier is Bad cable Check cable connections amplifier not connected connection or or try another cable connected cable appears The message The amplifier is Wrong selection of Select the correct input amplifier not connected amplifier type as device in the platform connected an input source in dialog of the settings appears the settings program program Problems with Nervus Reader Problem Criteria Probable cause Solution Error You do When Reader Dongle cannot be Attach dongle not have a is started seen license to run this program reported Close Reader and When events File being Remove read only Save as dialog have been reviewed is properties from file appears add
26. eo capture the Videum 1000 is designed for demanding audio and video applications like video capture and streaming video which are very CPU intensive Connections S video RAIDS Lier MCX camera in A BCDEF Composite video in AUX audio in Lin Mic audio in TD m UN WwW gt Audio out System functional checks 2 System functional checks This chapter describes how to verify the functionality and set up of the Nervus system The tests described cover all of the currently available options for the Nervus and therefore some tests or signal connections may not be relevant to the system being tested The various settings described are based on the factory defaults You need to carry out the following Basic functionality checks Amplifier checks Recording checks Review checks Printer checks Audio checks CD Writer checks DVD Writer checks 2 1 Equipment required Oscilloscope Signal Generator 1MQ and 10kQ 1 resistors Metric ruler Touchproof connection and shorting leads Nervus Test Data CD Test CD R Disk 2 2 Setting the system up for checking 1 Set the Nervus mains switch to Off 2 Check that a dongle is attached 15 Nervus Service Manual 3 Ifa printer is supplied then the data lead should be connected to the parallel port 4 Connect the Nervus system directly to the mains supply switch on and log in as Administrator 5 Check that after Windows has initialised the N
27. ervus Study Room is displayed 6 Close the Study Room 7 Rename the current Configuration database the location of this database is defined by the ODBC data source named CONFIG This must be done so that it can be re instated at the end of testing 8 Copy the configuration database from the Test Data CD onto the system 9 Double click the Recorder icon on the desktop to display the Recorder acquisition screen 10 Select Protocol from the Recorder menu and select the appropriate Signal Test protocol for the amplifier to be tested from the protocol list Click on Apply to close the Protocol window 11 Set the Sensitivity to 1000uV cm 2 3 Basic functionality checks Check power connections Nervus Desktop systems require an isolation transformer You must connect to the mains via the isolation transformer Nervus Notebook systems must use the Nervus medical power supply the ISB 060W isolation transformer is an option You must power your amplifier from the medical power supply The PC is powered by the PC manufacturer s own power supply The Nervus software requires the hardware licence key dongle to be attached to the PC To check the power connections 1 Connect the system as shown in the appropriate diagram 2 Connect the systems mains inlet to the mains supply and switch on using the power switch on the PC 3 Check that after the power on system test POST the logo is displayed in t
28. ever the data can be remontaged and displayed if required Once the data has been reviewed edited it can then be archived for long term storage using removable media such as CDR or DVD RW disks 1 3 Power supplies Mains supplies Check that the mains supply cable is fitted with a shrouded 3 pin mains connector female which mates with the appliance inlet at the back of the unit Check that the free end of the mains supply cable is fitted with a suitably rated mains plug having protective earth connection The wires are colour coded as follows Factory fitted ROW US and Canada Colour Connection Colour Connection Brown Live Black Line Blue Neutral White Neutral Green yellow Protective Green or Protective earth Green yellow earth The protective earth wire green yellow must be connected to the protective earth conductor Check that the protective earth conductor is connected to an external protective earth system to ensure patient safety and correct operation of the unit This protection is automatic in three wire mains systems if the mains plug has been correctly wired Connecting the systems For the Nervus Desktop based Acquisition systems the shrouded female socket of the mains supply cable mates with the male connector on the isolation transformer Separate mains leads fitted with moulded male and female connectors are then used to connect the PC monitor etc to the
29. fier verify that the corresponding LED on the amplifier is not illuminated Disconnect the resistor from the current monopolar input and connect it to a different monopolar input Repeat steps 4 and 5 until all other monopolar inputs have been checked Set the Threshold level to 2K Verify that the input under test appears with a red marker in the Impedance test dialog and if testing Nervus 40 amplifier that the corresponding LED on the amplifier is now illuminated Close the Impedance Test dialog If the amplifier being tested is a Nervus 40 then the following checks will need to be performed to verify that the bedside impedance mode is functioning correctly Press the centre button on the amplifier and verify that the Impedance Test dialog box appears Verify that the impedance Threshold level can be varied up and down from the amplifier buttons Turn off Impedance Check on the amplifier by pressing the centre button Close the Recorder 2 5 Recording checks 22 Double click the Study Room icon on the Windows desktop Click on the New Test button on the Study Room toolbar Select Existing Patient and click on Next Enter details into the Patient ID and Last Name fields then click on Next Set the Type to Routine EEG enter data into the Testld field and click on Finish System functional checks Highlight the newly created test in the Study Room Record List and click on Rec
30. follows e The Nervus 1501000 is used in Nervus Desktop systems e The Nervus ISB 060W is used in Nervus Notebook systems that have printers to meet patient safety requirements All parts of the system must be powered from the outlets of the isolating transformer However if required the Photic stimulator see Photic stimulator on page 13 may be connected directly to a fixed mains socket outlet 1 4 USB interface card All Nervus systems use the USB interface card in one way or another In Desktop based system the interface card is plugged into a PCI slot but in Notebook based systems the card is either inside the amplifier Nervus U32 or in the IBox The USB interface card is fitted internally in the PC Desktop and is an interface from the Nervus amplifier and photic to the USB connector of the PC It is plugged into the PC s PCI bus and draws 12V dc The Desktop PC must be powered via an isolating transformer from the mains Connecting the USB card Card to amplifier photic The Nervus amplifier and the photic are connected to the USB interface card by the splitter PC USB I F cable USB i Card to PC The card has a short looping cable connecting it to the USB input of the PC This cable is the only data link with the PC also providing control signals and 5V dc to the card The 5V dc is supplied to a voltage converter that provides 5V dc and 5V dc to the circuits on the card Technical overview There is
31. hat it already has been recorded but not marked as such System connected to main database when attempt is made to make a recording System connected to local database when attempt is made to make a recording Documents directory is not accessible File sharing is not enabled Check directory containing main database is shared Check user has write access to directory Check loopback adapter is installed and enabled Error Unable to open local data source Reported when shutting down Study Room Local database cannot be accessed Check the ODBC data source BEDTAUG points to the correct database Problems with running the Nervus Recorder Problem Criteria Probable cause Solution Error You do not have a license to run this program reported Impedance test box show empty boxes No amplifier detected No signals from amplifier Photic does not work Error No recording device detected reported 30 When Recorder is started No signal recorded for the channel s but other s are Amplifier appears to work Recorder reports error when launched Dongle cannot be seen The channel s is are not selected in the amplifier setup Amplifier data cable or splitter cable damaged Amplifier or cables faulty or badly connected Splitter cable damaged Amplifier not connected Attach dongle Close the file and select the chann
32. he centre of the screen After a short period the display should show the Windows Logon dialog Log in to Windows using the System functional checks Service User name and password refer to Nervus System Administrator s Guide for details Basic functionality 1 Verify that by moving the mouse around the mouse pointer can be moved to all areas of the display If necessary adjust the display for optimum display brightness and contrast You may need to refer to the monitor or Notebook manufacturer s User Manual for guidance Double click on the Recorder icon on the Windows desktop to launch the Recorder application Select Protocol Settings from the Recorder menu and click on Amplifier at the bottom left of the Montage Editor window that appears Click on the Amplifier list box in the Amplifier Setup window and select the amplifier connected to the system Click on Apply and then close the Amplifier Setup window Select Format Montage from the Recorder menu and select the Referential montage Verify that traces showing noise appear on the screen 2 4 Amplifier checks Signal checks The signal checks verify that a signal applied to an input of the amplifier is correctly displayed by the system All monopolar and bipolar inputs should be tested 1 2 3 Ensure that the system is pre configured as described in section 2 2 Set the Signal Generator to give a 100mV pk pk 10Hz sine wave output Connect a 1M0 1
33. he copyright and the foregoing restrictions on the copyright use extend to all media in which this information may be preserved This copy of the User Manual shall be used only in accordance with the conditions of sale of Taugagreining hf or its distributors Taugagreining hf makes no representations or warranties of any kind whatsoever with respect to this document Taugagreining hf disclaims all liabilities for loss or damage arising out of the possession sale or use of this document Nervus is a registered trademark of Taugagreining hf Medelec is a registered trademark of Oxford Instruments Medical TECA is a registered trademark of Oxford Instruments Medical Microsoft Windows Windows NT Windows XP and Office are registered trademarks of Microsoft Corporation Intel Pentium is a registered trademark of INTEL Corporation All other trademarks and product names are the property of their relevant owners Taugagreining hf rm li 10 108 Reykjavik Iceland Tel 354 580 7500 Fax 354 580 7501 www nervus is Using this manual Contents Using this Manual sasssa nu del nn 1 1 Technical overview se 3 1 1 IntrOdUEtION 28522 eda wan ds 3 1 2 Outline of Nervus data acquisition system 3 1 3 Power sUpplies iii 4 14 USBinterfate cardaire irinari inatasan iritan inerea inanan ai 8 1 5 B i AGE ss Neel natives ar lisa 10 1 6 Nervus M40 amplifier
34. isolated mains supply from the isolation transformer Technical overview For Nervus Notebook based systems when there is no isolation transformer the mains cable is connected directly to the medical power supply When an isolation transformer is supplied the shrouded female socket of the mains supply cable mates with the male connector on the isolation transformer Separate mains leads fitted with moulded male and female connectors are then used to connect the PC monitor etc to the isolated mains supply from the isolation transformer For the Nervus Reader systems the mains leads are connected directly to the mains supply as there are no patient connections and therefore no requirement for an isolation transformer However a Nervus Reader system will require an isolation transformer if a MR95 is to be connected to it and to a patient at the same time Voltage selection For Nervus Desktop systems check the voltage settings and fuse ratings as described below The input voltages of the Desktop PC monitor optional printer and photic stimulator must all be set to match the output voltage of the isolation transformer Refer to the rating labels and relevant user manuals to check if adjustment is necessary and for information on how to carry out any required adjustments For the Nervus Notebook systems the medical power supply used is auto ranging However the voltage setting of the Photic must be checked see Photic supply volt
35. led with recording in progress marker Too many programs are being launched at startup The ODBC data source TAUG might point to wrong location Main database cannot be found The logged on user does not have write access to the main database The Workarea does not exist The logged on user does not have write access to the main database The logged on user does not sufficient access rights on the main database Current user does not have permission to run Study Room Add user as a new user in Study Room Software has been corrupted Edit startup list to ensure only essential programs are launched Delete Study Room from startup list Attach dongle Check your data sources in ODBC Administrator Check the drive mapping and make sure the ODBC data source TAUG points to the right database Check database is not read only and that user has write access to file and directory Run Administration Center and redefine the Workarea Check database is not read only and that user has write access to database file and directory Check database is not read only and that user has write access to database file and directory 29 Nervus Service Manual Problem criteria Probable cause solution Error message Failed to record the test Possible cause is that it already has been recorded but not marked as such Error message Failed to record the test Possible cause is t
36. ly across the display without stuttering If the system has videometry then verify that the video window is updated smoothly without stuttering Close the Reader and return to Study Room 2 7 Printer checks GN DR D 24 Highlight the test recording in the Record List and click on Review If the Panel is not visible then select View Panel Show from the Reader menu Select File Print from the Reader menu and print the current page Verify that the printout matches the contents of the Reader window Set the montage to As Recorded Select Tools Options from the Reader menu Click on the Color Coding tab and set the Steps value to 299 Click on the lt symbol to the left of the Amplitude Map entry in the Panel to view the Amplitude Map window System functional checks 9 10 11 Click on the Printer icon at the bottom of the Amplitude Map window Verify that the printout matches the contents of the Amplitude Map window Close the Reader and return to Study Room 2 8 Audio checks 1 w 4 5 6 7 Highlight the test recording in the Record List and click on Review Set the montage to As Recorded Select Protocol Settings from the Recorder menu and ensure that the Audio box is checked on all channels in the montage Set the Paging Speed to 60 Click on the playback icon on the Reader toolbar Verify that audio can be heard as the Reader pages through the data Close the Reader and return t
37. m the manufacturer of the PC or from other manufacturers whilst they may power the PC correctly may not comply with the leakage current requirements defined in the medical electrical systems standard EN60601 1 1 Therefore in the event of failure the power supply for the Notebook PC must be replaced only by one of the same make and model The PCs used in the Nervus systems should be regularly checked to ensure optimal performance of the system The performance of the system is directly related to the performance of the Windows operating system and this can be maximised by performing the following actions regularly e Remove all unnecessary temporary files e Empty the recycle bin e Defragment all hard drives e Scan all hard drives for errors 4 2 Cleaning 33 Nervus Service Manual On no account should this equipment be autoclaved sterilised by exposure to heat radiation or any fluid or sterilised by any other means Cleaning may be carried out as specified below e All the outer surfaces of the individual pieces of equipment of the Nervus system may be cleaned using a cloth moistened with water and detergent Do not allow any liquid to enter the case of any instrument e Each item may also be cleaned using a low pressure air line or a vacuum cleaner with an appropriate attachment e Do not use propanone acetone on any of the instruments e For advice on methods and frequency of cleaning the PC monitor and printer c
38. nce 33 Medical power supply 7 servicing 36 Nervus Reader 4 Noise checks 20 Notebook servicing 35 Overview technical 3 Patient connections 11 PC specifications 37 PCMIA card 35 Performance optimisation 33 Photic flash rate check 23 Photic intensity check 23 43 Nervus Service Manual Photic stimulator 13 fuses 7 voltage 5 Pin out details 39 Polygraphy channels 38 Polygraphy inputs M40 38 Power supplies 4 Printer checks 24 Problem solving 27 Problems hardware and Windows 27 Reader 31 Recorder 30 software installation 28 Study Room 29 Pulse and Respiration transducers 11 Reader problems 31 Readership 1 Recorder 3 problems 30 Recording checks 22 Review checks 24 Servicing 35 Signal checks 17 Signal conversion M40 38 Sizes and weights 37 Software installation problems 28 Study Room problems 29 System functional checks 15 Technical information PCs 37 sizes and weights 37 Technical overview 3 Test files removing 26 Touchproof connectors 11 Tower PC servicing 36 U32 amplifier 13 USB interface card 8 input output connectors 9 Valor Recorder 3 Videum 1000 video card 14 Voltage selection 5 Windows problems 27 44
39. nce and Neutral inputs plus 8 bipolar polygraphy input channels The amplifier has the following internal boards e USB amplifier control board e 2X16 channel amplifier boards e USB interface board The amplifier must be powered from the medical power supply There is an isolated voltage converter mounted on the amplifier control board This provides the isolated 5V dc and isolated 5V dc to power the patient amplifiers and associated control circuits Connecting the Nervus U32 amplifier Amplifier to PC The Nervus U32 amplifier has a cable connecting it to the USB input of the PC This cable is the only data link with the PC also providing control signals and 5V dc The 5V dc powers the USB interface control circuitry in the amplifier Amplifier to photic The Nervus photic has a dedicated connector on the Nervus 32 amplifier so there is no need for a splitter lead with this system Amplifier to patient electrodes Signals from the patient electrodes are connected to the touchproof or the headcap connector inputs on the amplifier control board The signals are then passed to the amplifier boards These amplifiers have a gain of 500 with some low frequency band pass filtering The amplified signal is then digitised by the 22 bit ADC There is one ADC per channel 1 9 Photic stimulator The mains settings of the Nervus photic must be set to match the local mains supply or serious damage may result The photic stimulator is
40. nsult either Taugagreining hf or its authorised agent in your country or see the contact information at the start of this manual Nervus Service Manual Technical overview 1 Technical overview 1 1 Introduction This chapter describes the principal components of Nervus systems including the amplifiers photic stimulator USB Interface Card and IBox Technical specifications of the components are given in Technical information All other boards used in the Nervus systems are OEM and you should refer to the manufacturer s documentation for further information 1 2 Outline of Nervus data acquisition system Patient signals are amplified filtered and digitised within the amplifier at a sampling rate defined by the recording protocol being used by the Nervus Recorder software The Raw digitised data is transmitted across a serial link from the amplifier to an interface card in the PC The Nervus Recorder reads the Raw data from the interface card and stores it to disk in a location known as the Recarea which is used for storing data from recordings in progress The Recarea is located on the hard drive of the recording unit At the same time the Nervus Recorder software processes the Raw data based on the recording protocol being used to derive the Montaged EEG data which is displayed on the screen If the acquisition system is also configured for videometry then the video input is converted into a digit
41. o Study Room 2 9 CD Writer checks 1 2 11 Insert a blank CD R into the CD Writer Double click the test recording on the Record List in Study Room and note the name and location of the test file Open Windows Explorer Browse to the location containing the test file Select the test file and drag and drop it onto the drive icon for the CD Writer in the left hand Windows Explorer pane Right click on the CD Writer drive icon and select Write these files to CD from the pop up menu Give the CD a name and create the CD Browse the newly created CD and double click on the file that has just been written to the CD Verify that the Reader application is launched Click on the playback icon in the Reader toolbar and verify that the test file pages through to completion without any errors being reported Close the Reader 2 10 DVD Writer checks 25 Nervus Service Manual Insert a blank DVD RW disk into the DVD Writer and select the format from the dialog Double click the test recording on the Record List in Study Room and note the name and location of the test file Open Windows Explorer Browse to the location containing the test file Select the test file and drag and drop it onto the drive icon for the DVD Writer in the left hand Windows Explorer pane When the file has been copied browse the newly created disk and double click on the file that has just been written Verify that the Reader ap
42. o dedicated bipolar inputs on this amplifier monopolar inputs are paired together to act as bipolar inputs on this amplifier 1 Edit the montage to enable all channels that use bipolar inputs and disable all other channels 2 Set the Sensitivity to 10uV cm on all channels 3 Click the Preview button on the Recorder toolbar to start acquiring data without actually recording it A trace should be seen wiping across the display 4 Click the Stop button on the Recorder toolbar after a few seconds and verify that all traces have an amplitude of less than 6uV pk pk indicating a CMRR of gt 110dB Electrode impedance check Ensure that the system is pre configured as described in section 2 2 Remove all shorting leads and connections from all amplifier inputs Note All Nervus amplifiers have on screen indication of the electrode impedance some also indicate the LEDs on the amplifier 21 Nervus Service Manual Link the REF R and NEUT N with a touchproof connection and shorting lead Connect from this point to any monopolar input with the 4K7 resistor Select Acquisition Impedance from the Recorder menu Set the Threshold to 5K Verify that the input under test appears with a green marker in the Impedance Test dialog and that the impedance value measured is within 10 of the resistor value All open circuit inputs appear with a red marker and show an impedance value of 65K5 If testing the Nervus 40 ampli
43. onsult the documentation supplied with them Disk cleaning CD Writeable disks and drives Instructions for cleaning the writeable CD ROM drive and disks are provided in the manual supplied with the drive DVD RW disks and drives Instructions for cleaning the DVD RW drive and disks are provided in the manual supplied with the drive 4 3 Backing up data It is essential that all patient and configuration information is backed up before attempting to upgrade or re install the Nervus software or any other software component of the Nervus system Please refer to the Nervus Administrator s Guide for full details of the files that should be backed up and the recommended backup procedure 34 Servicing the Nervus 5 Servicing the Nervus This chapter describes how to service the Nervus systems In practice the Notebook PC has no user serviceable parts but you may have to replace a card For the Desktop PC systems it may be necessary to upgrade the unit or replace sub assemblies and information is provided here on dismantling and rebuilding the system Before any work is undertaken always check that the Nervus database has been backed up see Backing up data on page 34 This is vital if patient records and data are to be restored nnti static precautions must be taken if covers are to be removed Before performing any servicing function on the Desktop or Notebook PC check to see if it is still covered by the PC man
44. ord Select Protocol from the Recorder menu and select the appropriate All On protocol for the amplifier to be tested from the protocol list If the system has videometry then select Protocol Settings from the Recorder menu click Video at the bottom of the Amplifier Setup window select Full Video from the Video Templates list box and click on Apply Close the Video Settings window If the Panel is not visible then select View Panel Show from the Recorder menu If the Event List is not visible then click on the gt gt symbol on the right of the Event List entry in the Panel to view the Event List If the video window is not visible then click on the gt gt symbol on the right of the Video entry in the Panel to view the video window Verify that the traces wipe smoothly across the display without stuttering If the system has videometry then verify that the video window is updated smoothly without stuttering Continue recording for 5 minutes During the recording period check that the traces and video if present update smoothly without stuttering In addition verify that no amplifier disconnect or acquisition overflow errors are reported whilst recording Photic intensity 1 Select Protocol Settings from the Recorder menu then click on Photic at the bottom of the Montage Editor window that appears Select the Intensity entry from the Photic Sequences list box and click on Apply Close the Photic Editor window
45. plication is launched Click on the playback icon in the Reader toolbar and verify that the test file pages through to completion without any errors being reported Close the Reader 2 11 Removing test files 1 2 26 Highlight any test files on the Review List in Study Room Select Test Admin Delete Test from the Study Room menu and click Yes to delete the tests Close Study Room Delete the current file defined by the CONFIG ODBC setting and re instate the version backed up earlier Fault finding 3 Fault finding This chapter lists the possible causes of problems that may be encountered when using the Nervus systems It is split into two sections The first deals with the Nervus hardware and Windows problems and the second is specific to Nervus software Due to the complexity of the Windows operating system this chapter only covers the basics of the system As this manual covers all systems some items listed may not be relevant to the system being tested 3 1 Hardware and Windows problems ran rosbemse SS Unit dead Mains supply dead Mains fuses blown Mains lead damaged Mains isolation transformer failed Internal PSU failure System appears to power Monitor failure UpiuE no display Graphics card fault Notebook LCD failure Connect a monitor to VGA connector and switch notebook over to external monitor to check Video lead faulty Windows operating system System software has become corrupted
46. r Bookmark not defined 6 1 Technical Specifications 37 6 2 Amplifier TUNCtION aaa Seen ai 38 6 3 Interface connections 0 a00 tarna 39 dew REE ET AI 43 Using this manual Using this manual Intended readers The Nervus EEG system facilitates the capture and review of electroneurophysiological data The information contained in this Service Guide should enable a qualified electronic technician to verify the correct functioning of the equipment and to fault find to sub assembly level This guide is intended to be a supplement to the Nervus User Manual Please refer to the Nervus User Manual for information on safety system connections and overview of the software As the majority of the components used within the Nervus systems are surface mount technology SMT devices any defective sub assembly should be replaced as a complete item To assist with this fully tested replacement sub assemblies are available from Taugagreining hf and principal distributors As the Nervus system is designed for the Microsoft Windows operating system you need to be familiar with its basic features If necessary refer to the appropriate manuals supplied with Windows for an explanation of the terminology used here To resolve any queries regarding the operation of the system that cannot be resolved by consulting the User Manual or the application s help screens you should co
47. s bipolar inputs on this amplifier 1 Connect the 1mV signal and the signal ground from the attenuator to one of the bipolar inputs on the system Edit the montage to enable the channel using the selected bipolar input and disable all other channels Set the Sensitivity of the channel to 1000uV cm Click the Preview button on the Recorder toolbar to start acquiring data without actually recording it A trace should be seen wiping across the display Click the Stop button on the Recorder toolbar after a few seconds and verify that the trace shows a sine wave of 1mV pk pk amplitude Edit the montage to disable the current channel and enable another channel that uses a bipolar input Connect the 1mv signal to the appropriate bipolar input Repeat steps 2 to 5 until all bipolar inputs have been tested Remove all connections between the signal generator and the amplifier System functional checks Calibration checks calibration checks apply only to Nervus 40 amplifiers The calibration checks verify that the calibration signal is generated at the correct amplitude on the system and that calibration signals are generated on all inputs Ensure that the system is pre configured as described in section 2 2 and that the signal generator is not connected to the amplifier Monopolar inputs 1 6 Edit the montage to enable the first channel that uses a monopolar input and disable all other channels Select Acquisition
48. trol signals and 5V dc to the card The 5V dc is supplied to a voltage converter that provides 5V dc and 5V dc to the circuits on the card There is also an SMPSU that supplies the power for the Nervus amplifier The output voltage of the SMPSU can be set to either 5 6V or 6 3V Jumper link HDR1 controls the selection of the output voltage with the link fitted the output is 5 6V and with no E HDRI jumper link fitted the output is 6 3V The IBox must be configured ONLY for 5 6V output IBox to amplifier photic The Nervus amplifier and the photic are connected to the IBox by the splitter cable Input output connectors See USB Interface Card Technical overview 1 6 Nervus M40 amplifier The patient connectors are as follows Patient connections 52 touchproof connectors to tie FEG amplifier 36 connectors configured as 32 EEG channel system with 2 EEG Reference and 2 EEG Neutral inputs 16 connectors configured as 8 bi polar channels Event marker Can be attached via a 3 5mm socket to input patient events Pulse and Respiration Can be attached via 3 5mm sockets transducers When one of these transducers is attached to the board circuitry on the board automatically disconnects the polygraphy inputs for the relevant channel For example if the Resp 1 transducer is connected the second Polygraphy channel input is automatically disconnected from the amplifier Impedance check Switches for selecting the Imp
49. ufacturer s warranty Any unauthorised tampering may invalidate the warranty 5 1 Nervus Notebook PC The Notebook PC is not user serviceable Any repairs required to the Notebook should be carried out by the manufacturer or their appointed agents The User Manual for the Notebook PC describes how to replace batteries and minor sub assemblies in the event of a fault occurring It also recommends the methods for limited dismantling of the Notebook in order to expand or upgrade the unit You are advised to follow the advice in the User Manual Installing a PCMIA card Refer the Notebook PC User Manual After installing a card refer to the cards documentation and check the configuration in the computer s Hardware Setup is correct for the card Removing a PCMIA card Refer the Notebook PC User Manual Before removing a PC card refer to the card s documentation and use the Windows PC Card Properties utility to deselect the card To access the PC Card Properties utility click on Start Settings Control Panel then double click the PC Card PCMIA icon 35 Nervus Service Manual For physical removal of a PC card refer to the Notebook PC User Manual 5 2 Nervus Desktop PC You are advised to follow the advice in the Upgrade Guide for the Desktop PC This describes the recommended method for dismantling the Desktop PC in order to upgrade the unit or to replace sub assemblies in the event of a fault occurring The upgrade guide is
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