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Aspect Medical Systems BISPECTRAL INDEX A-2000, Service Manual

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SECTION VII                            DISASSEMBLING AND REASSEMBLING THE A-2000™ 

 

 

- 7-12 - 

 

 

 

 

 

 
6.  Loosen L bracket screw (Fig. 7-10). Be sure to check that the alignment of bottom 

screws is adequate, then install rubber foot, flat head steel (in center position), and 
flat head nylon screw (right side).  Tighten nylon screw first.  Do not over-tighten nylon 
screw.  Then tighten L bracket screw.  

 

Note: 

It is important to follow the instructions regarding the sequence of  
tightening the screws in step 6 above. Failure to do so may result in 
excess electro-magnetic radiation from the DSC monitor interface cable. 

 
7.  Install two screws at A/C input module. 
8.  Tighten all screws and equipotential stud.  Do not over-tighten. 
9.  Close case using the instructions in Section 7.2.2. 

Summary of Contents for BISPECTRAL INDEX A-2000

Page 1: ...or on the order of a physician Copyright 1999 Aspect Medical Systems All rights reserved Copying or other reproduction of this document is prohibited without prior written consent of Aspect Medical Sy...

Page 2: ...1 3 Cautions 2 3 2 2 KEY TO SYMBOLS 2 5 3 PRINCIPLES OF OPERATION 3 1 3 1 SYSTEM ARCHITECTURE 3 1 3 1 1 The Digital Signal Converter DSC 3 1 3 1 2 The A 2000 Monitor 3 7 3 1 3 A 2000 Printer 3 8 4 PR...

Page 3: ...c Diagnostics 6 8 6 2 3 Manual Diagnostics 6 13 7 DISASSEMBLING AND REASSEMBLING THE A 2000 7 1 7 1 REQUIRED TOOLS AND SUPPLIES 7 2 7 2 THE MONITOR CASE 7 3 7 2 1 Opening the Monitor Case 7 3 7 2 2 Cl...

Page 4: ...00 SPECIFICATIONS 8 1 8 1 GENERAL SPECIFICATIONS 8 1 8 1 1 Type of Protection against Electric Shock of the System 8 3 8 1 2 Degree of Protection against Electric Shock of the System 8 3 8 1 3 Degree...

Page 5: ...h needle nose pliers 7 15 Figure 7 10 The L bracket 7 15 Figure 7 11 Gently pull and flex to separate PCBs 7 16 Figure 7 12 Line up Interconnect PCB pins to Main PCB socket 7 16 Figure 7 13 Align stan...

Page 6: ...ttempting to set up or service the A 2000 please familiarize yourself with the safety information provided in this section Section III describes the A 2000 monitor hardware and how it operates Include...

Page 7: ...The system is composed of a monitor and a digital signal converter with a patient interface cable PIC and BIS Sensor 1 2 1 1 Monitor The monitor contains the operator control panel an electro lumines...

Page 8: ...Please refer to the A 2000 Operating Manual 070 0015 for additional information 1 3 INSTRUMENT IDENTIFICATION 1 3 1 A 2000 Monitor Monitor identification information is permanently marked on the rear...

Page 9: ...SECTION I INTRODUCTION 1 4 Figure 1 1 The A 2000 BIS Monitoring System...

Page 10: ...SECTION I INTRODUCTION 1 5 Figure 1 2 Rear View of Monitor Clamp Shoe Fuse Holder Serial Port Potential Equalization Terminal...

Page 11: ...SECTION I INTRODUCTION 1 6...

Page 12: ...STHETICS MAY OCCUR FOR PROPER GROUNDING THE POWER RECEPTACLE MUST BE A THREE WIRE GROUNDED OUTLET A HOSPITAL GRADE OUTLET IS REQUIRED NEVER ADAPT THE THREE PRONG PLUG FROM THE MONITOR TO FIT A TWO SLO...

Page 13: ...ATTERY OPERATION POSSIBLE WITH NO AC CONNECTED EXTREME CARE MUST BE USED WHEN DISASSEMBLING AND ASSEMBLING THE A 2000 MONITOR WITH AC DISCONNECTED AND BATTERY POWER ON HIGH VOLTAGE IS PRESENT ON THE E...

Page 14: ...connected from the wall socket and which has been charging the battery for at least four hours After long periods of storage e g 1 month it may be necessary to cycle discharge then charge the battery...

Page 15: ...ality Continuous impedance checking may need to be disabled if the 1 nanoampere 128 Hz impedance check signal interferes with other equipment e g evoked potential monitors VERY IMPORTANT Use only the...

Page 16: ...he mains OFF power disconnection from the mains Audible Alarm Silenced Operating on Battery Type BF Equipment Attention Consult Accompanying Documents J1 Attention J1 RS 232 Serial Port Consult Accomp...

Page 17: ...SECTION II SAFETY PRECAUTIONS 2 6 Fuse Replace only with same Type and Rating Equipotential Alternating Current Dangerous Voltage Protective Earth ground Storage Temperature Limits...

Page 18: ...gram appears in Figure 3 2 After passing through input protection circuits in the DSC the EEG signals are differentially amplified and filtered to remove DC and high frequency components The signals a...

Page 19: ...SECTION III PRINCIPLES OF OPERATION 3 2 Figure 3 1 The A 2000 System Block Diagram...

Page 20: ...SECTION III PRINCIPLES OF OPERATION 3 3 Figure 3 2 The A 2000 Signal Flow Diagram...

Page 21: ...ifiers also serve as filters to prevent aliasing by the converters 3 1 1 3 DSC Impedance Testing In the default state of the DSC the combined channel electrodes impedance is continuously checked A sma...

Page 22: ...led onto a balanced twisted pair line The transformer provides the required patient isolation The communications board decodes the control information coming from the host via a command line Commands...

Page 23: ...SECTION III PRINCIPLES OF OPERATION 3 6 Figure 3 3 The Digital Signal Converter DSC DSC 2 Monitor Interface Cable DSC pigtail Patient Interface Cable PIC...

Page 24: ...ock and DSC interface All software and firmware can be downloaded through the serial port 3 1 2 2 Digital Signal Processor The functions of the DSP include decimation filters for up to 2 channels of E...

Page 25: ...ondary has two outputs which are rectified and filtered to create 5 V and 10 V outputs The 10 V signal drives a DC to DC converter to create the 12 V output and charges the battery The battery driven...

Page 26: ...stem between heated buildings and outside storage Once moved inside allow the monitor to stabilize in the unopened shipping container at the inside ambient temperature before unpacking and placing int...

Page 27: ...PLUG FROM THE MONITOR TO FIT A TWO SLOT OUTLET IF THE OUTLET HAS ONLY TWO SLOTS MAKE SURE THAT IT IS REPLACED WITH A THREE SLOT GROUNDED OUTLET BEFORE ATTEMPTING TO OPERATE THE MONITOR IF THE INTEGRIT...

Page 28: ...le into the port opening with your thumb and index finger squeeze and pull back on the gray cylindrical connector housing Do not twist or pull on cord 4 2 2 Power Cord Connections The A 2000 is design...

Page 29: ...ord Verify OPERATING ON BATTERY BACKUP E33 is displayed Verify battery icon displays in BIS banner top left corner of screen 7 Reconnect power cord Verify battery icon is not displayed in BIS banner V...

Page 30: ...g the Monitor and Digital Signal Converter Use lint free absorbent towels dampened with 10 bleach solution or a commercial disinfectant e g Lysol Professional Disinfectant Foam Cleaner Spray or PDI Ge...

Page 31: ...cordance with the national laws of the country Contact Aspect Medical Systems Inc or the local distributor for a replacement battery WARNING ELECTRICAL SHOCK HAZARD DO NOT REMOVE MONITOR COVERS DURING...

Page 32: ...IED THAT THE GROUND LEAKAGE CURRENT AND THE PATIENT SAFETY CURRENT WERE LESS THAN THE SPECIFIED LIMITS ESTABLISHED BY THE APPLICABLE SAFETY STANDARDS AS A MATTER OF SAFE PRACTICE THE INSTITUTION SHOUL...

Page 33: ...by passing impedance check or by exiting with MENU EXIT key 5 Disconnect power cord Verify OPERATING ON BATTERY BACKUP E33 is displayed Verify battery icon displays in BIS banner top left corner of sc...

Page 34: ...ppendix 9 2 If a simulator is not available use the following procedure to make a test sensor 1 Remove a new sensor from its plastic carrier sheet and place on flat surface with the adhesive facing up...

Page 35: ...SECTION V PREVENTIVE MAINTENANCE CARE AND CLEANING 5 6...

Page 36: ...s The corrective procedures include replacing assemblies Corrective actions are arranged according to probability of cause Table 6 1 Troubleshooting the A 2000 Monitor Symptoms Causes Corrective Proce...

Page 37: ...fective Replace main board Printer inoperative Printer out of paper Replace printer paper Printer off line Place printer on line A 2000 in battery backup mode Replace A C line cord power Printer defec...

Page 38: ...r replace sensor as required Notch filter OFF Check notch filter setting DSC is defective Replace DSC Fails impedance test Electrode impedance too high Initiate impedance check re prep or replace sens...

Page 39: ...BIS Engine and printer and can be used to check for impedance The manual diagnostics are operator initiated using the A 2000 keys and menu choices These procedures check for the proper functioning of...

Page 40: ...useful if a hardware failure prevents the display from working Each audible error code consists of a long tone followed by one or more short tones and finally another long tone The specific error cond...

Page 41: ...splay Host DRAM failure Replace main board 9 short tones no display Host SRAM failure Replace main board Program Memory Checks 1 short tone no display Bad checksum or signature in Boot Block Replace m...

Page 42: ...rrupted in real time clock Check real time clock battery Data Memory Data Memory FAILED SYSTEM HALTED Data Memory failed erase or write Replace main board Data Memory ERASED DATA MEMORY LOST Check Tim...

Page 43: ...le connections 2 Inspect repair cable at connector end 3 Replace the DSC 4 Replace the main board E02 DSC Overcurrent 1 Defective DSC cable 2 Defective DSC 3 Defective monitor 1 Replace the DSC 2 Repl...

Page 44: ...eplace the main board E16 Last Sensor Check Failed 1 At least one electrode has too high impedance 2 Poor lead connection 3 Defective PIC 4 Defective DSC 5 EXIT pressed prematurely 1 Check impedance r...

Page 45: ...ion or the presence of electrocautery devices 1 Re prep the Sensor 2 Check impedances E28 Bad Signal Quality The Signal Quality Index is unacceptable The Primary Trend variable cannot be calculated an...

Page 46: ...to avoid automatic shutdown Software E35 E39 E43 E45 E48 E65 Software Error A serious software error has occurred The monitor may stop operating 1 Turn the monitor off then on again 2 Update the soft...

Page 47: ...Corrective Actions Printer E66 Printer Out of Paper Printer is out of paper Replace the paper E67 Printer Error 1 Printer is off line 2 Print head is up 3 Printer is disconnected 4 Print head tempera...

Page 48: ...screen will display 2 The following information appears DSC Test Results In Progress Ch1 Ch2 Noise V Hi Pass Blocked V Hi Pass Normal V Gain V The DSC test consists of four sub tests The first checks...

Page 49: ...T to start test Press MENU EXIT to end test When SELECT is pressed the display will start to cycle through 3 test screens a All pixels on b Alternating pixels on checkerboard c Reverse of b The test w...

Page 50: ...starting up does not have full epoch yet 7 00000080 not used 8 00000100 Total Power Too Small 9 00000200 Motion Sudden Change Low frequency or eye blink artifact detected 10 00000400 Glitch High Freq...

Page 51: ...mode The IPU sets the DSC into the blocking state when both channels are clipped When either the left or right channel is unclipped for 1 second then blocking is turned off but the blocking artifact...

Page 52: ...ng in the Diagnostic Menu 1 Highlight Impedance Checking then press the SELECT key until OFF appears in reverse video 2 Use the arrows to go to the next option or press MENU EXIT to exit Impedance lev...

Page 53: ...SECTION VI DIAGNOSTICS AND TROUBLESHOOTING 6 18...

Page 54: ...Y A QUALIFIED BIOMEDICAL ENGINEERING TECHNICIAN POWER OFF THE UNIT USING THE POWER SWITCH UNPLUG THE MONITOR BEFORE DISASSEMBLING REASSEMBLING THE A 2000 IF METAL COMES IN CONTACT WITH THE TERMINALS O...

Page 55: ...and Main board Needle nose pliers Stripping off the switch set releasing standoff tabs to separate boards Wire cutter Cutting cable ties used to anchor battery Wrench for special connector nut 820 000...

Page 56: ...re attach the cable 7 To remove the small flex circuit cable of the switch panel gently pry up the tension flange on the connector at the Interconnect PCB releasing the flex circuit cable See Figure 7...

Page 57: ...ct the power cord 9 Check continuity for less than 10 Ohms between chassis ground lug on rear of monitor and pin 5 of the DSC connector on front panel of monitor Refer to section 8 2 5 for pin out inf...

Page 58: ...SECTION VII DISASSEMBLING AND REASSEMBLING THE A 2000 7 5 Figure 7 1 Opening the Monitor Case Tape Figure 7 2 The E L Display Cable...

Page 59: ...SECTION VII DISASSEMBLING AND REASSEMBLING THE A 2000 7 6 Flange Figure 7 3 The Keypad Cable Tension Flange...

Page 60: ...1 Carefully position the gasket in the gasket groove with gap located at the top 2 Place the E L display board into position trapping the gasket 3 Replace the four mounting screws loosely 4 Align the...

Page 61: ...SECTION VII DISASSEMBLING AND REASSEMBLING THE A 2000 7 8 Figure 7 4 The Four Mounting Screws...

Page 62: ...discard switch set 5 Using isopropyl alcohol and a cloth remove any residue remaining on bezel surface Allow surface to dry completely before installing new switch set 7 4 2 Installing the New Switch...

Page 63: ...SECTION VII DISASSEMBLING AND REASSEMBLING THE A 2000 7 10 EMI strip Figure 7 5 The Cable Access Port Figure 7 6 Remove the covering on the back of the new switch set...

Page 64: ...or rear case shell are now ready for further service activities 7 5 2 Installing the Printed Circuit Board Assembly Refer to Figures 7 7 7 8 and 7 21 Note On newer A 2000 units copper tape has been ad...

Page 65: ...ghten nylon screw first Do not over tighten nylon screw Then tighten L bracket screw Note It is important to follow the instructions regarding the sequence of tightening the screws in step 6 above Fai...

Page 66: ...SECTION VII DISASSEMBLING AND REASSEMBLING THE A 2000 7 13 Equipotential Stud Flat screw Nylon screw Figure 7 7 Place rear case assembly face down on a scratch free work surface Figure 7 8 Fan Cable...

Page 67: ...e PCBs BE CAREFUL NOT TO BEND PINS ON INTERCONNECT PCB See Figure 7 11 7 6 2 Installing the Main PCB Refer to Figures 7 9 through 7 14 1 To connect Main PCB to Interconnect assembly line up pins of In...

Page 68: ...SECTION VII DISASSEMBLING AND REASSEMBLING THE A 2000 7 15 Figure 7 9 Release standoff tab by squeezing with needle nose pliers L bracket Figure 7 10 The L bracket...

Page 69: ...BLING THE A 2000 7 16 Interconnect PCB Main PCB Power Supply PCB Figure 7 11 Gently pull and flex to separate PCBs Interconnect PCB pins Main PCB socket Interconnect PCB Notch Figure 7 12 Line up Inte...

Page 70: ...II DISASSEMBLING AND REASSEMBLING THE A 2000 7 17 Figure 7 13 Align standoffs and push in until standoff tabs snap into place Figure 7 14 Install L bracket by holding long side short side connects to...

Page 71: ...SECTION VII DISASSEMBLING AND REASSEMBLING THE A 2000 7 18 L bracket Figure 7 15 The L Bracket Installed...

Page 72: ...UL NOT TO BEND PINS ON INTERCONNECT PCB See Figure 7 16 6 Remove battery assembly by removing four screws on rear of Power Supply PCB See Figure 7 17 7 Remove shield from rear of Power Supply PCB See...

Page 73: ...SECTION VII DISASSEMBLING AND REASSEMBLING THE A 2000 7 20 Figure 7 16 Gently flex and pull Power Supply PCB free of pins Figure 7 17 Remove four screws on rear of Power Supply PCB...

Page 74: ...SECTION VII DISASSEMBLING AND REASSEMBLING THE A 2000 7 21 Figure 7 18 Remove shield from rear of Power Supply PCB...

Page 75: ...en the monitor case as described in Section 7 2 1 9 Remove the Interconnect PCB as described in Section 7 5 1 10 Disconnect battery cable by depressing securing tab and lifting connector from J300 jac...

Page 76: ...SECTION VII DISASSEMBLING AND REASSEMBLING THE A 2000 7 23 Tie Wraps J 300 Figure 7 19 Battery and cable...

Page 77: ...e Figure 7 20 4 Remove four mounting screws Retain fan gasket and soft washers Note Newer versions of the A 2000 have only two mounting screws 7 9 2 Installing the Fan 1 Position fan over gasket with...

Page 78: ...A 2000 7 25 Clamp Shoe Screws Wiring Fan Mounting Screws 4 Figure 7 20 Fan wiring orientation and Clamp Shoe screws Rubber Bumper Fan Mounting Screws 2 Conductive Copper Tape Figure 7 21 Updated Syst...

Page 79: ...Section 7 5 1 3 Remove three screws securing shoe clamp assembly See Figure 7 20 7 10 2 Installing the Clamp Shoe Assembly 1 Install screws securing clamp shoe assembly using Loctite 425 2 Install the...

Page 80: ...the monitor 3 Locate the plastic locking tabs securing the fuse holder in place 4 Insert the tip of a ball point pen or similar tool into the slots provided to release the plastic locking tabs allowin...

Page 81: ...SECTION VII DISASSEMBLING AND REASSEMBLING THE A 2000 7 28 Figure 7 22 Releasing the plastic locking tabs of the fuse holder Figure 7 23 Re installing the fuse holder...

Page 82: ...rter Weight 4 7 oz 0 134 kg including integral cable Dimensions 2 60 in wide x 1 00 in high x 4 25 in deep 6 6 cm x 2 5 cm x 10 8 cm Cable Length 12 ft 3 7 m integral DSC cable 3 ft 0 9 m Patient Inte...

Page 83: ...onds for Trend DSA Event Markers User selected Alarms Auditory and visual user adjustable limits Filters ON 2 70 Hz with notch or OFF 25 100 Hz Note Filter setting does not effect computed parameters...

Page 84: ...is isolated from all other parts of the equipment to such a degree that the patient leakage current allowable in single fault condition is not exceeded when a voltage equal to 1 1 times the highest r...

Page 85: ...SECTION VIII A 2000 SPECIFICATIONS 8 4 8 3 Digital Signal Converter DSC Connector LEMO 5 female...

Page 86: ...ped by Purchaser under this warranty shall be packaged in the original shipping container or equivalent packaging to protect the Product If Purchaser ships a Product to Aspect in unsuitable packaging...

Page 87: ...SECTION VIII A 2000 SPECIFICATIONS 8 6 LOSS OF USE OF ANY PRODUCT EXCEPT AS SET FORTH HEREIN ALL PRODUCTS ARE SUPPLIED AS IS WITHOUT WARRANTY OF ANY KIND EITHER EXPRESS OR IMPLIED...

Page 88: ...0003 Front Bezel Assembly 1 185 0071 A 2000 DSC Assembly 1 186 0067 Patient Interface Cable PIC S 1 Patient Interface Cable only 1 channel referential for use with BIS Sensor 186 0105 Sensor Simulato...

Page 89: ...ce cable The Inputs and are where one connects the test signals to test the BIS Monitor Test types allowed Sensor check This checks and verifies that the monitor is reporting the proper impedances tha...

Page 90: ...he end of the simulator using conventional methods such as jumpers or alligator clips Wire attached with screws will work also Connect the test signal to the shorted terminals Make sure that you are n...

Page 91: ......

Page 92: ...Business Fax 508 653 6788 Customer Service 888 BIS INDE X press 6 OR 800 442 7688 press 6 Technical Service 800 442 2051 Email bis_info aspectms com Web www aspectms com Aspect Medical Systems Interna...

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