Schiller AT-102 Service Handbook Download Page 7 | Manualshive

Page: 7 / 140

background image

vii

Article Number 2. 540 028

SCHILLER AG 2002

Contents

AT-102 ECG Recorder Service Handbook

Functional Check ........................................................................ 3.12

Thermal Printer Check ................................................................ 3.13

Print Head Alignment and Print Head Tension...................................... 3.14
Thermal Printer Fault Diagnosis ............................................................. 3.14

RS-232 Interface (and Spiro Check) .......................................... 3.15

Section 4 Module Removal and Replacement .. 4.1

Introduction .................................................................................. 4.3

Safety Notices .............................................................................. 4.4

Physical Overview ........................................................................ 4.5

Exploded View Lower Casing ...................................................... 4.6

Exploded View Upper Casing ...................................................... 4.7

Prerequisites, Test Equipment, Tools, and Accessories .............. 4.8

General Prerequisites .................................................................................4.8
Part Numbers ..............................................................................................4.8

Opening and Closing the Case .................................................... 4.9

Top Assembly Removal ..............................................................................4.9
Top Assembly Replacement .................................................................... 4.11

Main Board MK 18 - 1 ................................................................. 4.12

Parts .......................................................................................................... 4.12
Board Removal ........................................................................................ 4.12
Board Replacement ................................................................................. 4.14

Printer Tray and Thermal printer ................................................. 4.15

Thermal Printer Removal ........................................................................ 4.15
Thermal Printer Replacement. ................................................................ 4.15

Battery Pack ............................................................................... 4.16

Battery Pack Removal ............................................................................. 4.16
Checks and Tests After Battery Replacement ...................................... 4.16

Keyboard .................................................................................... 4.17

LCD screen board ...................................................................... 4.18

LCD board Removal ................................................................................ 4.18

«
...
5
6
7
8
9
...
»

Summary of Contents for AT-102

Page 1: ...540 028 SCHILLER AG 2002 Contents AT 102 ECG Recorder Service Handbook AT 102 12 Channel ECG Recorder Service Handbook SCHILLERAG Altgasse 68 6341 Baar Switzerland Phone 41 41 766 42 42 Fax 41 41 761 08 80 www schiller ch ...

Page 2: ...ns Guide to the SCHILLER Interpretation and Measurement Program AT 102 User Guide The SCHILLER sales and service centre network is worldwide For the address of your local distributor contact your nearest SCHILLER subsidiary In case of difficulty a complete list of all distributors and subsidiaries is provided on our internet site http www schiller ch ...

Page 3: ... AT 102 ECG Unit is provided for the exclusive use of qualified physicians or personnel under their direct supervision The numerical and graphical results and any interpretation derived from a recording must be examined with respect to the patient s overall clinical condition Patient preparation and the general recorded data quality which could affect the report data accuracy must also be taken in...

Page 4: ...s for Operation with other Devices xiii Maintenance Precautions xiv Symbols and Conventions Used in this Service handbook xv What s in this book xvi Section 1 Operating Elements 1 1 Introduction 1 2 Features 1 2 Operating Philosophy Overview 1 3 Initiating Functions or Tasks 1 3 Main Components of the AT 102 1 4 Back Panel 1 5 Power Supply 1 6 Switching On and Off 1 6 Changing a Mains Fuse 1 7 Pot...

Page 5: ...tings 1 20 General Settings 1 21 Selecting the ERGO Device 1 21 Blood Pressure Entry 1 21 Selecting the Default Test Protocol 1 22 Defining the Stage Printout Format 1 22 ST Amplitude Lead 1 22 Defining Editing Exercise Protocols 1 23 Factory programmed Treadmill Protocols 1 24 Bruce 1 24 Factory programmed Bicycle Protocols 1 24 System Settings 1 25 Unit 1 26 User Identification User ID 1 26 Date...

Page 6: ...al Keyboard 2 7 Section 3 Fault Finding 3 1 Introduction 3 2 General Check Procedures 3 2 Fault Finding Chart 3 3 AT 102 Initial Fault Diagnosis Chart Sheet 1 3 3 AT 102 Initial Fault Diagnosis Chart Sheet 2 3 4 AT 102 Fault Diagnosis Chart Sheet A Power Problems 3 5 AT 102 Fault Diagnosis Chart Sheet B Power Problems 3 6 AT 102 Fault Diagnosis Chart Sheet C General Problems 3 7 AT 102 Fault Diagn...

Page 7: ...loded View Lower Casing 4 6 Exploded View Upper Casing 4 7 Prerequisites Test Equipment Tools and Accessories 4 8 General Prerequisites 4 8 Part Numbers 4 8 Opening and Closing the Case 4 9 Top Assembly Removal 4 9 Top Assembly Replacement 4 11 Main Board MK 18 1 4 12 Parts 4 12 Board Removal 4 12 Board Replacement 4 14 Printer Tray and Thermal printer 4 15 Thermal Printer Removal 4 15 Thermal Pri...

Page 8: ...Component Side 5 6 Battery Charge Voltage 5 7 Precautions and Requirements 5 7 Tools and Equipment 5 7 Procedure 5 7 Paper Mark Detector Check 5 8 Tools Equipment and Material 5 8 Procedure 5 8 ECG Amplifier 2V 2V and PWM Ramp Time Adjustment 5 10 Tools Equipment and Material 5 10 Procedure 5 10 Service Screen 5 12 Upgrading the Unit Updating the Software 5 14 Installing New Software Options Upgra...

Page 9: ...ction 7 Technical Data 7 1 Technical Data 7 3 System 7 3 Safety Standards 7 4 Technical Data for ECG 7 4 Technical Data for Spirometry Option 7 5 Standard 7 7 Configurations 7 7 Annex A Glossary A 1 Introduction A 2 Acronyms A 3 Annex B AT 102 Circuit Diagrams and Engineering Drawings B 1 Index ...

Page 10: ...s used in accordance with the manufacturers instructions THEREARE NO EXPRESS OR IMPLIED WARRANTIES WHICH EXTEND BEYOND THE WARRANTIES HEREINABOVE SET FORTH SCHILLER MAKES NO WARRANTY OF MERCHANTABILITY OR FITNESS FORA PARTICULAR PURPOSE WITH RESPECT TO THE PRODUCT OR PARTS THEREOF This equipment has been tested and found to comply with the limits for a class A digital device pursuant to both Part ...

Page 11: ...r of Explosion Do not open the battery casing Danger of acid burn Only dispose of the battery boards or components in official recycling centres or municipally approved areas Alternatively used batteries and components can be returned to SCHILLER AG for disposal Units no longer required can be returned to SCHILLER AG for disposal Alternatively dispose of the unit in municipally approved recycling ...

Page 12: ...Do not touch the unit casing during defibrillation If the patient cable should become defective after defibrillation lead off is displayed and an acoustic alarm given Do not operate the unit if the earth connection is suspect or if the mains lead is dam aged or suspected of being damaged This product is not designed for sterile use This product is not designed for outdoor use Do not use this unit ...

Page 13: ... two or more units are coupled together an isolation transformer must be used in the mains supply The AT 102 complies with EMC regulations for medical products which affords protection against emissions and electrical interference However special care must be exercised when the unit is used with high frequency equipment There is no danger when using the ECG unit simultaneously with electrical stim...

Page 14: ... is protected by double pole neutral fusing for continued protection against the risk of fire Replace only with the same fuse type and rating Do not use high temperature sterilisation processes such as autoclaving Do not use e beam or gamma radiation sterilisation Do not use solvent or abrasive cleaners on either the unit or cable assemblies Do not under any circumstances immerse the unit or cable...

Page 15: ...rm or loss of life or failure to follow directions could result in damage to equipment or loss of information WARNING Specific Warning Text set off in this manner indicates that failure to follow directions could result in bodily harm or loss of life CAUTION Text set off in this manner indicates that failure to follow directions could result in damage to equipment or loss of information NOTE Text ...

Page 16: ...only Complete operating information is provided in the SCHILLERAT 102 User Guide Chapter 2 Functional Overview This chapter provides a functional overview of the AT 102 The description is supported by functional block diagrams Chapter 3 Fault Diagnosis This chapter provides a guide to locate a fault to module level The diagnostics are presented in a logical sequence of fault finding algorithms and...

Page 17: ...ing information for all replaceable modules Also included in this chapter are details of any special test equipment or special tools required for adjustment or fault finding procedures Chapter 7 Technical Data The full technical specification of the AT 102 is given in this chapter AnnexA Glossary This chapter explains all the acronyms and signal titles used in this book and in the AT 102 circuit d...

Page 18: ...xviii SCHILLER AT 102 ECG Recorder Service Handbook ...

Page 19: ...tion contains an introduction to the AT 102 and an overview of all external connections It also gives an overview of the operating philosophy of the AT 102 and an introduction to the basic functions of the unit An overview of the system settings are given in this section for full operating details and system setup see the AT 102 User Guide ...

Page 20: ...the following features Features Alphanumeric keypad and dedicated soft key interface for easy user friendly operation Storage and transmission facilities for recordings Excercise ECG with interface for control of digital ergometers and treadmills Option Integral full size thermal quality printer with various user defined print format options External laser or deskjet printer Option ECG Interpretat...

Page 21: ...smission Memory Screen In this screen stored recordings can be accessed Patient Data Screen Patient data entry via the keypad Data Entry and Setup In these screens all system settings resting and exercise ECG settings and spiro settings are made Initiating Functions or Tasks Most functions and tasks are initiated by the 5 softkeys situated immediately below the LCD The function of the softkeys var...

Page 22: ...AT 102 1 Keypad and dedicated function keys 2 Patient cable connector 3 RS 232 for any of the following connection of an ergo device connection of a spiro sensor connection of a modem or a PC for export of stored recordings 4 Softkey control 5 LCD Display 3 2 4 5 1 ...

Page 23: ...1 LPT connector for the connection of an external printer 2 Master Reset 3 Potential equalisation stud 4 Mains connector with fuse below CAUTION All externally connected hardware must be approved by SCHILLER Connection of any hardware not approved by SCHILLER is at the owner s risk The unit guarantee may also be invalid 1 2 3 4 ...

Page 24: ... the built in rechargeable battery The power source is indicated on the top line of the LCD When mains is connected a mains symbol is displayed When the unit is running on battery power a battery symbol is displayed Power Indicator symbol The internal battery provides power for up to 3 hours The Battery indicator blinks when the battery capacity is limited To recharge the battery connect the appar...

Page 25: ...isation The potential equalisation stud at the rear of the unit can be used to equalise the ground potential of the AT 102 to that of all mains powered equipment in the vicinity Use the hospital or building common ground CAUTION To avoid possible interference from the Ergometer when carrying out an exercise test it is recommended that both the AT 102 and the Ergometer are connected to the same com...

Page 26: ...1 8 AT 102 Service Handbook Introduction Keypad 4 7 8 9 10 11 12 13 14 15 16 1 2 3 5 6 17 ...

Page 27: ...set the speed of the ECG both on the screen and on the manual printout The speed on the screen can only be set to 25 or 50 mm s The speed of the manual printout can be 5 10 25 or 50 mm s The 5 and 10 mm s settings are both on the same key which toggles the two speeds 9 Inserts a 1mV reference marker on the screen and printout Recentres the trace 10 Toggles the QRS beeper ON OFF 11 Myogram filter O...

Page 28: ...ays gives the softkey options The following is an example of a typical resting ECG screen Items 1 2 and 3 are in the same position for all screens 1 Top line time date patient name and current power source mains or battery When battery capacity is limited the battery symbol flashes 2 Softkey designation Pressing the key below the text carries out the function indicated The options available will c...

Page 29: ...ates that the electrode resistance is too high The electrode s must be reapplied 6 Sensitivity 5 10 or 20 mm mV Change the sensitivity with the keys 3 auto 4 5 and 6 An A in this box indicates that automatic sensitivity is selected auto mode printout only 7 Speed 25 or 50 mm s Change the speed with the keys 8 and 9 8 Lead indication leads currently displayed on the screen Change the lead group wit...

Page 30: ...102 ECG and system settings are entered by selecting setup from the initial screen The following pages detail the programmable ECG parameters NOTE In units where the interpretation option is not installed interpretation state ments cannot be displayed ...

Page 31: ... NEXT softkey to confirm setting and to move onto the next screen Format 2 ECG Printout Press the SELECT softkey to choose from the following options No Printout No printout of the ECG given at the end of an auto mode recording the recording can be stored in the memory and printed at a later time if required 4 3 1 Rhythm Leads are printed in a 4 3 format at 25mm s with the selected rhythm lead at ...

Page 32: ...hythm leads at the bottom of the page at 25mm s 2 6 50mm s 2 Rhythm Leads are averaged over the entire 10 second recording and printed in two groups of six at 50mm s with the two selected rhythm leads at the bottom of the page at 25mm s Rhythm Leads Select the rhythm lead 1 and rhythm lead 2 as described above Rhythm Lead 1 Select any lead I II III aVR aVl aVF V1 to V6 Rhythm Lead 2 Select any lea...

Page 33: ... follows Baseline filter The cutoff frequency of the filter is set on the top line The cutoff can be 0 05Hz 0 15Hz or 0 3Hz Note The set value is the lower limit of the frequency range and is normally set to 0 05 Hz The settings 0 15 and 0 30 Hz should only be used when absolutely necessary as the possibility exists that they could affect the original ECG signal especially the ST segments ...

Page 34: ... Mains filter The mains filter is an adaptive digital interference filter designed to suppress ac interference without attenuating or distorting the ECG Set the mains filter in accordance with the frequency of your local mains supply Baseline Stabiliser SCHILLER SBS The baseline stabiliser greatly reduces the baseline fluctuations without affecting the ECG signal The purpose of the stabiliser is t...

Page 35: ...n also be set for interpretation sensitivity Low sensitivity will suppress certain non specific ECG diagnoses this may be advisable when carrying out ECGs for screening Sensitivity High or low sensitivity Age Assumed to be Greater than 30 years or 30 years and under NOTE The Patient age assumed to be setting is only applicable when patient data has not been entered When a patient s date of birth h...

Page 36: ...e Signals Select between Simultaneous all ECG leads are printed in the same time segment in automatic mode only or Sequential each group is a contiguous time segment of approximately 2 5 or 5 seconds in automatic mode only Auto Centering Select between On all ECG traces are centred dynamically for optimal use of paper width or Off ECG traces are set to a fixed baseline position and may possibly ov...

Page 37: ...llowing lead groups can be displayed Rhythm Lead Group II avF III V2 V4 V5 Left Posterior V4 V9 V4 V5 V6 V7 V8 V9 Right Precordials V5r V1 V2 V3 V3r V4r V5r Right Precordials V6r V1 V2 V3r V4r V5r V6r Nehb D A J D A J only three leads The above leads can also be printed when displayed only in manual mode The lead groups are changed both on the screen and on the manual printout with the lead next p...

Page 38: ...AT 102 Service Handbook Stress Settings The AT 102 Stress ECG settings are entered by selecting Setup and Stress Settings from the initial screen The following pages detail the stress settings for the AT 102 ...

Page 39: ...rcise bicycle 900 911 SECA CT100 mod 545 Treadmills The Ergoline digitally controlled treadmill TM435 TM4000ES RAM 770CE MTM 1500 Blood Pressure Entry Select between Off Auto and Manual When Manual is selected the BP screen for entry of blood pressure is displayed 55 seconds before the end the stage When the stages are less than one minute long or a stage is held then the BP screen is displayed ev...

Page 40: ... one for a bike are defined by the user see following page Defining the Stage Printout Format A stage printout is given at the end of every stage When the stages are less than 2 minutes long or a stage is held then a prinout is given every 2 minutes The waveforms are averaged to give 4 x 3 plus 1 rhythm lead or 6 x 2 The rhythm lead printed is the ST lead defined below ST Amplitude Lead Define the...

Page 41: ... selecting the two default bike protocol see previous page Base Load The load in Watts applied during the warm up period Step load The load increase at every step Recovery Load The load applied during the recovery phase Step Interval The duration of each step For a treadmill Protocol the following can be set Protocol Name As above Step Interval The duration of each step Speed The individual treadm...

Page 42: ...1 3 min 2 7km h 1 7mph 10 2 3 min 4 0km h 2 5mph 12 3 3 min 5 4km h 3 4mph 14 4 3 min 6 7km h 4 2mph 16 5 3 min 8 0km h 5 0mph 18 6 3 min 8 8km h 5 5mph 20 7 3 min 9 6km h 6 0mph 22 Factory programmed Bicycle Protocols One factory programmed Bicycle protocols is available 252525 This gives a base load warmup of 25W 50W with a step load for both protocols of 25W and a recovery load of 25W ...

Page 43: ...AG 2002 AT 102 ECG Service Handbook Section 1 Operating Elements System Settings The AT 102 system settings are entered by selecting setup and system settings from the initial screen The following pages detail system settings for the AT 102 ...

Page 44: ...or or hospital etc Select User ID and a blinking cursor is present enter up to 30 characters via the keypad Note If the unit is reset to the default settings see following the user identification must be re entered Date and Time Enter the date in the format day month year Enter the time using the standard 24 hr notation When set the ENTER key must be pressed to confirm ...

Page 45: ... temperature in Fahrenheit temperature in degrees centigrade Mains filter setting 60Hz mains filter setting 50Hz date order mm dd yy date order dd mm yy Additionally when American is set further race settings are given and Spiro diagnosis is based on ITS recommendations see Spirometry handbook The default language is Standard International English Startup Screen Here you can specify the first scre...

Page 46: ...e network Phone No Enter the telephone number preceded by T or P tone or pulse A comma gives a one second pause in dialling this may be necessary for example if an outside line is required Modem Init Enter the modem initialisation codes Full details will be found in the user guide for your modem However the modem initialisation must contain at the minimum the following commands with the prefix AT ...

Page 47: ...ER AG 2002 AT 102 ECG Service Handbook Section 1 Operating Elements System Settings Test and Information A code of the options installed is given after the software version These are as follows C Interpretation S Stress M Memory Standard ...

Page 48: ...S Stress and Serial number of the unit ECG Format 1 and 2 Speed Default speed setting Auto printout Long ooo Short o or Suppressed MECG Average cycles as defined in auto ECG recording setup e g 4 3 25 mm s 2 Rhythm leads Leads selected for R1 R2 resp Measurements Print Enabled or Suppressed Marks Print Enabled or Suppressed Interpretation Print Enabled or Suppressed Leads Sequence Standard S or Ca...

Page 49: ...ssed Abnormal Normal Abnormal printed Enabled or Suppressed Comm Baud rate 115200 57600 38400 28800 14400 or 9600 This is followed by parity setting Y N bits and number of stop bits Mode Line or Modem Spiro F f v Enabled or Suppressed Flow f V Enabled or Suppressed Diagn Enabled or Suppressed PEFD l min Enabled or Suppressed Axis 5 10 or 20 mm s Stress Bike 900 911 or SECA CT100 or none Prot 25252...

Page 50: ... special test plug is used to carry out the UART test Full details if checking the RS 232 port is given in the AT 102 Service Handbook Upgrade Update Software Use the upgrade option to install any available software options e g Exercise An upgrade code can be obtained from SCHILLER Use the Update option to update the current software NOTE Details of these procedures are given in Section 5 of this ...

Page 51: ...ection 1 Operating Elements System Settings Default Settings To reset the unit to the base default settings press the BASE INIT softkey As the unit resets to the default values a message is briefly displayed on the LCD The base settings Defaults are given on the following page ...

Page 52: ...V1 II MECG none Measurements Suppressed Interpretation Suppressed Marks Enabled Leads Sequence Standard S Sequence Standard S Rhythm On Rhythm On V9 On V9 On V4r Off V4r Off V5r Off V5r Off DAJ Off DAJ Off Autom Centering Enabled Autom Centering Enabled Signals Sequential Signals Sequential Filter Baseline 0 05Hz Baseline 0 05Hz Mains Filter 50Hz 60Hz Mains Filter 50Hz 60H Myogram 35Hz OFF Myogram...

Page 53: ...on Spiro FVC f t on FVC f t on 1 F f v on F f v on Diagn on Diagn on PEF l min on PEF l min on Axis 10 mm s Axis 10 mm s Stress Bike 900 911 Bike 900 911 Prot 252525 Prot 252525 TM ETM435 TM4000ES TM ETM435 TM4000ES Prot Bruce Prot Bruce BP off BP off Stage Print 4 3 1 Rhythm Stage Print 4 3 1 Rhythm ST Lead V5 ST Lead V5 J Point J 60msec J Point J 60msec ...

Page 54: ...1 36 AT 102 Service Handbook ...

Page 55: ...2 1 Article Number 2 540 028 SCHILLER AG 2002 AT 102 Service Handbook Section 2 Functional Overview Section 2 Functional Overview ...

Page 56: ...supports the text Most of the electronics are mounted on a single main board which is housed in the base of the two part AT 102 casing The main functional areas of the AT 102 are as follows On the Main Board CPU 68332 Opto isolated and shielded ECG multiplexer with isolated power supply and patient interface Power Supply Flash EPROM electrically erasable 16 Megabytes In the top assembly Keyboard T...

Page 57: ...age regulator Switching voltage reg 5V ref 5 2V 24V Overvoltage protection Undervoltage protection Voltage sense conversion MON Motor running BLOW 10 3V MON US ON OFF control Battery charger voltage regulator Rectification Voltage sense US US 5 2V 24V 12 V Battery Mains LED Mains connector U MAIN BOARD MK 18 1 LCD power supply P2 P4 part P8 P17 P7 P11 P12 MUX CTRL Batt OFF from CPU ON from keyboar...

Page 58: ...n the unit is switched on and mains is not connected i e the unit is running on battery power A Battery low signal BLOW is set to logic 0 when battery voltage US falls to 11 3 V A circuit compensates for voltage drop when the printer stepper motor is active and the BLOW signal is active only at 10 3 V The battery voltage is also monitored directly by the CPU which switches the unit off when the vo...

Page 59: ...it has two functions as follows To provide a delay on initial switch on to ensure that the power supply is fully stabilized and give the 200ms reset time required by the 68332 processor To disable the unit if the 5V rail drops below 4 75V Stepper Motor Controller The printer stepper motor controller sets the speed of the printer motor with a clock frequency dictated by the master CPU The purpose o...

Page 60: ...hus reducing incoming signal distortion the incoming signal from the patient left leg electrode is phase shifted 180o This phase shifted signal is then used by the signal ground reference to cancel or reduce patient induced noise RS 232 Interface This is a standard RS 232 V 24 interface connected to the MK 18 10 main board The communications controller contains a USART and interface circuit which ...

Page 61: ...e LCD backlight and the contrast voltage LCD data is stored in a video RAM and the LCD controller converts the data to the proper form for the LCD screen Alphanumerical Keyboard The keyboard is a matrix style circuit which is periodically scanned by the processor via the keyboard interface circuit It is an integral part of the top assembly and can not be individually replaced ...

Page 62: ...2 8 AT 102 Service Handbook ...

Page 63: ...3 1 Article Number 2 540 028 SCHILLER AG 2002 AT 102 Service Handbook Section 3 Fault Finding Section 3 Fault Finding ...

Page 64: ...d the first module given is the one most likely to contain the fault Other modules given should be checked in the order given When a module has been replaced specific test parameters and setting up of the module may be applicable The removal and replacement instructions for all replaceable modules along with any setup or check procedures required are given in Chapters 4 and 5 If the initial fault ...

Page 65: ... THE BATTERY THE BATTERY LEADS AND THE BATTERY CONNECTORS FOR SHORT CIRCUITS REPLACE FUSE AND SWITCH ON IF THE FUSE IS STILL RUPTURING REPLACE THE MAINBOARD GO TO FAULT DIAGNOSIS SHEET A POWER PRO BLEMS NOTE The removal and replacement instructions and the location of all boards cable assemblies and connectors are given in Chapter 4 PRESS THE ON KEY ENSURE THAT THE VOLTAGE SELECTOR IS CORRECTLY SE...

Page 66: ...ENSURE THAT PARAME TERS ARE IN TOLERANCE CONTACT SCHILLER IF FAULT CANNOT BE FOUND NO YES DOES THE PAPER TRAY EJECTION WORK CORRECTLY NO YES PRINTER MOTOR FUNCTIONED GO TO FAULT DIAGNOSIS CHART SHEET B POWER PROBLEMS IF THE PO WER SUPPLY IS OK CHECK THE PRINTER MOTOR NO YES GO TO FAULT DIAGNOSIS CHART SHEET D PRINTER PROBLEMS CONNECT A PATIENT SIMU LATOR TO THE ECG CONNECTOR AND SWITCH ON IS THE P...

Page 67: ...MAINS FUSE OK YES DISCONNECT THE FLYING LEADS FROM THE MAINS TRANSFORMER TO THE POWER SUPPLY REPLACE THE MAINS FUSE AND SWITCH ON NO REMOVE THE TOPASSEMBLY VISUALLY INSPECTALL CABLE ASSEMBLIES AND CONNECTORS ENSURE THAT ALL CONNECTORS ARE SECURE LOOK IN THE AREA OF THE TRANSFORMER AND MAINS INPUT FOR SIGNS OF BURNING OR SCORCHING SHORT CIRCUIT IN THE MAINS ASSEMBLY REPLACE THE MAINS ASSEMBLY RECTI...

Page 68: ...ARE ALL THE CABLE ASSEMBLIES AND CONNECTORS OK NO YES CONNECT A DVM ACROSS THE MAINS TRANSFORMER REPLACE THE MAINS TRANSFORMER NO YES ARE ALL POWER SUPPLIES OK REPLACE THE MAIN BOARD RECTIFY THE CAUSE OF THE PROBLEM REPLACE FAULTY COMPONENT S IS THEAC VOLTAGE READING APPROX 18V POSSIBLE FAULT INTHE POWER SUPPLY CHECKALL POWER RAILS 1 REPLACE THE CABLE ASSEMBLY BETWEEN THE MAIN BOARD AND THE LCD BA...

Page 69: ...OF THE PROBLEM REPLACE FAULTY COMPONENT S NO YES ARE ALL POWER SUPPLIES OK REPLACE THEMAIN BOARD CHECK ALL POWER RAILS REMOVE THE TOPASSEMBLY VISUALLY INSPECT ALL CABLE ASSEMBLIES AND CONNECTORS ENSURE THAT ALL CONNECTORS ARE SECURE CHECK THE LCD CONTRAST CONTROL CHECK THE CABLEASSEMBLY BETWEEN THE POWER SUPPLYAND THE LCD BOTTOM ASSEMBLYTO TOP ASSEMBLY REPLACE REPLACE THE LCD REPLACE THE VIDEO LCD...

Page 70: ...AY CHANGE IF NECESSARY NO YES YES DOES THE PROBLEM STILL EXIST DOES THE PAPER JAM OR NOT STOP AT THE CORRECT POSITION CHECK AND ADJUST THE PAPER MARK DETECTOR AND CURRENT LIMITER THRESHOLDS AS DETAILED IN CHAPTER 5 REPLACE 1 MAIN BOARD 2 THERMAL PRINTER CARRY OUT THE PRINTER CHECK DETAILED IN CHAPTER 5 REPLACE THE THERMAL PRINT HEAD IF NECESSARY ...

Page 71: ...SET SEE CHAPTER 1 OR AT 102 OPERATING HANDBOOK NB ENSURE THAT THE STRESS TEST EQUIPMENT IS FUNCTIONING CORRECTLY IS A DIGITAL RS CONTROLLED STRESS TEST EQUIPMENT USED CHECK RS INTERFACE SETTING DETAILED IN CHAPTER 5 REPLACE THE MAIN BOARD CHECK THAT THE CABLE ASSEMBLY TO THE STRESS TEST EQUIPMENT IS CORRECTLY AND FIRMLY CONNECTED TO THE RS 232 INTERFACE ONLYDIGITALLY CONTROLLED ERGOMETERS CAN BE U...

Page 72: ...L SETTINGS ARE CORRECT SEE AT 102 USER GUIDE POSSIBLE OPERATOR ERROR REPLACE THE MOUTHPIECE SP250 REPLACE FILTER SP 260 CAN THE CALIBRATION PROCEDURE BE CARRIED OUT CHANGE 1 MOUTHPICE 2 FLOW SENSOR 3 MAIN BOARD CHECK ALL SPIROMETRY CABLING ENSURE THATALL CONNECTIONS ARE SECURE CHECK SPIRO INTERFACE SETTING DETAILED IN CHAPTER 5 ENSURE CORRECT SENSOR SPECIFIED SP 250 OR SP260 ...

Page 73: ...S IN THE RS CHECK PROCEDURE DETAILED IN CHAPTER 5 NO SETTING CORRECT YES POSSIBLE OPERATOR ERROR CHECK ALL CABLE ASSEMBLIES REPLACE IF NECESSARY 1 CHECK THE 12V AND 12V SUPPLYVOLTAGES 2 CHANGE THE MAIN BOARD ENTER SETTINSG MENU CHECK THAT ALL SETTINGS LINE MODEM RECORD BLOCK PARITY STOP BIT AND THE BAUD RATE ARE CORRECT FOR THE APPLICATION AND ARE THE SAME IN BOTH DEVICES ...

Page 74: ...and switch ON Three ECG traces heart rate sensitivity time scale and status of lead connections are shown on the screen If a lead alarm is flashing check that the lead is properly connected Press the MAN Start key Six leads are printed and are of good quality If not reset to default settings and try again Open the case and inspect all cable assemblies and connectors Check printer alignment Run pri...

Page 75: ...out for evenness of print Faulty pixel shown as a horizontal line on the test printout exaggerated on this example for clarity If a faulty pixel is detected the printer must be replaced If the printout is uneven for example darker at the top than at the bottom it indicates that the printer alignment is not correct If the printout is too faint or too dark check the paper old paper paper that has be...

Page 76: ...at correct position Clean paper mark detector with a 70 alcohol solution Allow to dry completely Ensure that good quality fresh paper is installed Change the PM detector Change the Printer Motor changes the complete printer Printout uneven Fading at top or bottom Check evenness of spring pressure of the printer to roller Check roller for wear and symetry Clean print head pixel array with alcohol E...

Page 77: ... RS 232 connector the sensor type can be displayed to ensure that it is the correct type The Comm test screen is entered for the settings screen MENU SETUP SYSTEM SETTING TEST and INFO COMM TEST You are then prompted to select UART TEST and only if a spiro sensor is connected to the RS 232 interface SPIRO SENSOR When UART TEST is selected the current Baud rate RTS and CTS settings are displayed Wh...

Page 78: ...3 16 AT 102 Service Handbook ...

Page 79: ...4 1 Article Number 2 540 028 SCHILLER AG 2002 AT 102 Service Handbook Section 4 Module Removal and Replacement Section 4 Module Removal and Replacement ...

Page 80: ...sembly access to In Base assembly access to Battery pack connectors Paper tray assembly and motor Main Board MK 18 1 ECG and battery charge voltage potentiometers Thermal printer LCD screen assembly Keyboard Remove top assembly Mains transformer and connector ...

Page 81: ...s and Tests that must be carried out after replacement Any adjustments jumper settings special checks or functional procedures that are required during a procedure are detailed in the relevant step In text diagrams support the text where required and provide location details of connectors test points and adjustment potentiometers Specific warnings and cautions are given where applicable Warnings i...

Page 82: ...s place the unit on an earthed antistatic mat Personnel must be earthed when handling any boards or components Always use an antistatic bag when transporting boards or components The unit is susceptible to abrasion damage To prevent scratching always place the unit on a soft non abrasive cloth when carrying out maintenance procedures Take care not to place any strain on the connecting ribbon cable...

Page 83: ...2 interface the thermal printer the paper tray the battery and mains transformer The electronics of the unit are contained on a single double sided printed circuit board the main board MK 18 1 This board is secured on spacers moulded in the base section The battery is secured in position in a moulded recess accessed from the bottom of the units and the mains transformer is secured on spacers above...

Page 84: ...er Motor Paper Mark Detector Thermal Print Head EMC shield ECG Processing Part Main Board MK 18 1 Mains Transformer Battery Casing Securing Screws x6 Printer Roller Toothed Wheel Paper Tray Worm Drive Paper Tray EMC shield IMPORTANT Mains Isolation Shield This must placed between the mains transformer and board ...

Page 85: ...4 7 Article Number 2 540 028 SCHILLER AG 2002 AT 102 Service Handbook Section 4 Module Removal and Replacement Exploded View Upper Casing LCD Keyboard Foil Recess for LCD ...

Page 86: ... bladed posi drive and flat bladed screwdrivers Cleaning agent such as Trichlorethylene Selection of spanners Flat ended pliers Double sided tape ECG Patient Simulator e g phantom 320 SCHILLER Patient Cable Low abrasion antistatic mat General Prerequisites The unit must be placed on an antistatic mat and antistatic precautions observed when any maintenance is carried out on the AT 102 The room tem...

Page 87: ...a soft antistatic cloth 2 Unscrew and remove the six countersunk retaining screws and washers situated in the extreme corners and edges of the unit 4 Grasping the top and bottom of the unit to ensure that the two assemblies cannot part carefully return the unit to the standing position 5 Gently lift the Top Assembly sufficiently to gain access to the interconnecting cables Disconnect the cable ass...

Page 88: ...4 10 AT 102 Service Handbook Opening and Closing the Case Support the top casing in an upright position to prevent straining the cable assemblies and connectors ...

Page 89: ...sure that all connectors are firmly home 4 Position the Top Assembly in front of the Base Assembly and without straining the ribbon cable plug in the interconnecting cable from the keyboard to the main board Connect the ribbon and the dual wire cable assemblies from the LCD board to the power supply part of the main board Note It may be necessary to tilt the Top Assembly for the cable assemblies t...

Page 90: ...and Cautions at the beginning of the chapter must be observed Ensure that the mains cable is removed before commencing CAUTION The main board contains static sensitive components observe antistatic precautions 1 Open the AT 102 casing as described previously support the top assembly 2 From the rear of the unit unscrew the support securing screws ...

Page 91: ...eplacement Main Board MK 18 1 3 Carefully hinge the top assembly so that the top assemblies are apart as shown 4 Disconnect all connectors on the board including the live and the neutral bayonet connectors to the mains connector 5 Unscrew the securing screws on the top of the board and remove the board ...

Page 92: ... secure at the 12 fixing points 2 Reconnect all connecters P2 under internal battery P9 under Video VGA P15 under Ext Printer P14 under RS 232 P1 under Patient P16 under Comm Module not used P8 LCD Data P10 Keyboard P7 Thermal Printer Motor P12 Paper Mark Detector P11 Thermal Printer Data P5 Blood pressure Module not used P13 Paper Tray Motor ...

Page 93: ... printer in position 3 Gently remove the printer taking care to retain the two tensioning springs Thermal Printer Replacement To replace the thermal printer proceed as follows 1 Position the printer in the paper tray print assembly so that the printer mounting plate lips slot into the dedicated cutouts in the assembly 2 Insert the two tensioning springs so that the springs are positioned over the ...

Page 94: ... Remove the top assembly as detailed previously 2 Disconnect the two bayonet connectors for the Main board P2 3 Gently return the top assembly in position and firmly holding both parts turn the unit up side down 4 Unscrew the battery compartment cover plate retaining screws and remove the battery Checks and Tests After Battery Replacement Program all static settings which will have been lost when ...

Page 95: ...er 2 540 028 SCHILLER AG 2002 AT 102 Service Handbook Section 4 Module Removal and Replacement Keyboard The keyboard comes as a complete assembly with the top casing The part number of the keyboard is given in Chapter 6 ...

Page 96: ...fore commencing CAUTION The main board contains static sensitive components observe antistatic precautions LCD board Removal 1 Disassemble the top and bottom sections as described previously 2 Disconnect the data connector and the LCD backlight power connector for the Main board 3 Unscrew the four retaining screws securing the LCD board in position and remove the board ...

Page 97: ...5 1 Article Number 2 540 028 SCHILLER AG 2002 AT 102 ECG Service Handbook Section 5 Adjustments Section 5 Adjustments System Upgrades and Software Updates ...

Page 98: ...5 2 AT 102 Service Handbook ...

Page 99: ...re required on the module or on associated modules or software are also detailed In text diagrams support the text where required and provide location details of connectors test points and adjustment potentiometers Specific warnings and cautions are given in the text where applicable The part numbers for all replaceable modules are given in Chapter 6 The AT 102 has the following adjustments Batter...

Page 100: ...n carrying out any maintenance procedures always place the unit on an earthed antistatic mat Personnel must be earthed when handling any boards or components Always use an antistatic bag when transporting boards or components Care must be taken when removing and replacing connectors Never use force Never strain the cable assemblies The procedural steps given for each module must be followed in the...

Page 101: ...e AT 102 The list of proprietary equipment is not comprehensive Recommendations of suitable proprietary test equipment can be obtained from the SCHILLER Service Department Proprietary Test Equipment Tools ECG Simulator e g Phantom 320 Oscilloscope Digital Multimeter Standard tool kit with a selection of cross bladed flat bladed and posi drive screwdrivers pliers and general tools SCHILLER 10 lead ...

Page 102: ... 102 Service Handbook Main Board MK 14 10 Adjustment Locations Component Location MK18 1 Component Side P9 Video VGA P15 Ext Printer P14 RS 232 P1 Patient P16 Comm Module VR2 VR1 VR3 P2 under internal battery ...

Page 103: ...ally 13 5V Adjust and check as follows 1 Disassemble the unit as detailed in chapter 4 2 Remove the Main board MK 18 1 from the assembly and remove the EMC shield from the board 3 Replace the board in position 4 Remove the two battery connectors if not already removed and connect a 2 7 kOhm 250mW resistor across the two battery connectors on the main board to simulate a discharged battery Connect ...

Page 104: ...eplaced Tools Equipment and Material Digital voltmeter Small flat bladed screwdriver 70 alcohol solution and clean lint free cloth Procedure To check the paper mark Schmitt trigger sensitivity proceed as follows WARNING Mains power is potentially lethal disconnect the mains before disas sembling the unit and remove the mains cable Paper Mark detector cable Paper Mark opto sensor ...

Page 105: ... main board and place the top assembly on its side behind the Base assembly 4 Switch the unit on and set the speed of the printer to the slowest setting of 5mm s 5mm s key 5 Press the MAN START key to activate the printer The paper is now moving at low speed through the roller and paper mark detector 6 Check the pulse amplitude at P12 pin 3 Measure with AC setting signal is noisy no paper mark whi...

Page 106: ...s Equipment and Material Digital voltmeter Small flat bladed screwdriver Procedure WARNING Mains power is potentially lethal disconnect the mains before disas sembling the unit and remove the mains cable 1 Disassemble the unit as detailed in Chapter 4 2 Remove the Main board MK18 1 from the assembly and remove the EMC shield from the board 3 Replace the board in position 4 Reconnect the keyboard t...

Page 107: ... Switch the unit on and measure the voltage difference between the 2V reference and the 2V reference on pins 1 and 7 of operational amplifier U79 Adjust trimmer VR1 to achieve a voltage difference of 4000 mV 2mV Reassemble the unit as detailed in Chapter 4 Re check the voltage by again obtaining a service printout see following ...

Page 108: ...ues are for information only The service screen also gives variable settings and measurements that can be set by the service engineer to carry out these adjustments some of the settings require additional test equipment To display the service screen Connect the patient cable Press alternative key Fn and from the resting aquisiton screen press LEAD TEST The following screen is displayed To obtain a...

Page 109: ... offset This gives the voltage drop in the patient cable and can indicate any faults in the patient cable or patient electrode The value given is the dc voltage between the left leg electrode and all other electrodes The measurements obtained will indicate any cable short circuits or open circuits The measured voltage value will depend on where the electrodes are connected The voltage readings tha...

Page 110: ...de option to install any available software options e g Exercise To install new options in the AT 102 a code must be entered This code must be obtained from SCHILLER To install software option proceed as follows 1 Enter the TEST and INFO screen SETUP SYSTEM SETTINGS TESTAND INFO 2 Select SOFTWARE The following is displayed ...

Page 111: ...ding the Unit Updating the Software 3 Select UPGRADE The following is displayed 4 Enter the upgrade code When the correct code is entered acceptance of the code is indicated by a series of beeps The option can be used immediately CAUTION More than 10 attempts to enter the incorrect code blocks the unit ...

Page 112: ...ng a RS 232 to RS 232 cable assembly Prerequisites RS 232 cable assembly P N 2 310 159 SWUP Programme for WindowsTM this can be downloaded from the SCHILLER Mailbox Procedure 1 Using the RS 232 cable assembly P N 2 310 159 connect the AT 102 RS 232 connector on the side of the unit to any free COM port on your PC 2 On the AT 102 enter the TEST and INFO screen SETUP SYSTEM SETTINGS TESTAND INFO 3 S...

Page 113: ...e SWUP icon on the desktop or via the Startup Schiller Menu The following is displayed 8 Click the config icon The following screen is displayed 9 Select the applicable COM port 1 or 2 Set the Baudrate to Auto or to the same Baud rate as set in the AT 102 10 Click on update version to update the system software 11 A series of beeps indicates that the software has been successfully updated The upda...

Page 114: ...5 18 AT 102 Service Handbook ...

Page 115: ...6 1 Article Number 2 540 028 SCHILLER AG 2002 AT 102 Service Handbook Section 6 Spared Parts Section 6 Spare Parts ...

Page 116: ...re given on our web site www schiller ch In case of difficulty or to obtain the address of your local dealer please contact the head office Our staff will be pleased to help process your order or to provide any details for all SCHILLER products The address for advice is SCHILLERAG Sales Department Order Processing Altgasse 68 6340 Baar Switzerland Phone Number 41 41 766 42 42 Mail sales schiller c...

Page 117: ...Number 2 540 028 SCHILLER AG 2002 AT 102 Service Handbook Section 6 Spared Parts Spare Parts The parts listing for the AT 102 at the time of print was being revised Please contact your local agent for parts listing ...

Page 118: ...6 4 AT 102 Service Handbook ...

Page 119: ...7 1 Article Number 2 540 028 SCHILLER AG 2002 AT 102 Service Handbook Section 7 Technical Data Section 7 Technical Data The technical data is subject to change ...

Page 120: ...7 2 AT 102 Service Handbook ...

Page 121: ...ox 300 automatic ECG print outs or 100 spirometry records Power Consumption Max 30VA Line frequency filter Distortion free suppression of superimposed 50 or 60 Hz sinusoidal interferences by means of adaptive digital filtering Frequency range of digital recording system 0 Hz 150 Hz IEC AHA Chart paper Thermo reactive Z folded 210 mm wide A4 Printing process High resolution thermal head printer 8 d...

Page 122: ...nsufficient electrode contact Heart Frequency HF mm mv mm s Leads 12 simultaneous leads Standard Cabrera Chart print out speed 5 10 25 50 mm s manual print Sensitivities 5 10 20 mm m either automatically adjusted or manually selected Automatic lead programs 6 12 channel presentations of 12 simultaneously recorded standard leads on one or more A4 pages Numerous print out formats can be selected Dat...

Page 123: ...5 FEF75 85 PEF FEF25 FEF50 FEF75 FIVC FIV1 0 FIV1 0 FIVC FIV1 0 FVC PIF FIF50 FMFT SVC SVC ERV IRV TV MVV MVV RR TV Presentation possibilities print out and screen Flow volume graph Volume time graph Table of measured values Realtime flow curve Data record Patient data name age height weight user ID Registration conditions date time date of last calibration Flow volume graph and or volume time gra...

Page 124: ... SPIROVIT SP 260 Pneumotach Flow sensor for pulmonary function testing with reusable mouthpiece Dimensions of SP 260 125 x 36 x 28 mm approx 160 g 4 9 x 1 4 x 1 1 in approx 0 34 Ibs Measuring method Measuring accuracy Flow impedance same as SP 250 Delivered 1 pneumotach sensor choice of SP 250 disposable P N 2 100022 or SP 260 reusable sensor P N 2 100551 Accessories 2 nose clips and either 1 pack...

Page 125: ...pirometry data on PC Hardware options Equipment trolley Spirometry sensor SP 250 or SP 260 Calibration syringe Vacuum electrode system VAC 100 External printer Configurations The CARDIOVITAT 102 is available in three versions Version M Standard Unit with ECG recording measurements memory and printout capabilities Version C Interpretation Standard unit with ECG Interpretation program Version S Stre...

Page 126: ...7 8 AT 102 Service Handbook ...

Page 127: ...Annex A 1 Article Number 2 540 028 SCHILLER AG 2002 AT 102 Service Handbook Annex A Glossary AnnexA Glossary ...

Page 128: ...ssary of the important signals and acronyms used in the circuit diagrams for the SCHILLER instruments They will not all apply to the AT 102 Only abbreviations that are specific to SCHILLER equipment are included here General electrical and electronic abbreviations are not included ...

Page 129: ...pment with 12 V battery For other equipment the limits are different CHAD ECG signal multiplexer control signals on the ECG amplifier CIF 0 16 Communication interface General control signals for the communications interface circuits CI 0 10 RS interface control lines input CO 0 10 RS interface control lines output CL1 19 kHz LCD latch pulse CL2 3 11 MHz LCD clock frequency CLK Clock signal The num...

Page 130: ...D FIFOR First in first out read FLM Control signal for frame synchronisation of the LCD FPIN Input for floating point co processor FWR Flag read write HREN Output enable signal for thermal print head data History enable HSYNC Horizontal synchronisation video VGA output IPL0 2 Interrupt priority level binary encoded IREG Control signal from the current detector and limiter circuit on the power supp...

Page 131: ...D Control signal from the battery charging circuit MOFF Motor off MON Motor ON printer motor enable signal NWTZ Mains supply NMI Non maskable interrupt activated by the reset button OFF Off signal from the OFF key to switch off the power supply PDS Control signal derived from FLM unity waveform 1 2 FLM frequency PM Paper mark signal PMARK Paper mark detection signal PMPON Pacemaker detection pulse...

Page 132: ...e pulse dependant on the ambient temperature of the print head and the resistance of the print head TPCSEL Thermal printer controller select control of thermal printer FIFO input memory buffer TPL Thermal printer latch print strobe control and data latch signal TPRES Thermal printer reset FIFO reset for thermal printer controller TPS 0 1 Thermal printer strobe TPTH Thermal printer temperature dc v...

Page 133: ...is not connected When mains is connected this supply charges the battery ULCD Contrast voltage to LCD US Input voltage for all PSUs on the power supply board from the rectified mains or from the battery VCC 5 V VMA Valid memory address VPA Valid peripheral address VSYNC Vertical synchronisation video VGA output WP0 and WP1 ECG in the serial multiplexed ECG serial data to the CPU sent over the opti...

Page 134: ...Annex A 8 AT 102 Service Handbook ...

Page 135: ...Annex B Circuit Diagrams and Engineering Drawings AT 102 User Guide Article Number 2 540 028 SCHILLER AG 2002 Annex B 1 Annex B AT 102 Circuit Diagrams and Engineering Drawings ...

Page 136: ...Index 1 Article Number 2 540 028 SCHILLER AG 2002 AT 102 Service Handbook Index Index ...

Page 137: ...Test 1 32 Component Location ECG Amplifier 5 11 Configurations 7 7 Contents iv Customer Services Sales Department 6 2 D Date and Time 1 26 Default Settings 1 33 Default Test Protocol 1 22 Defining Editing Exercise Protocols 1 23 Disposal Instructions xi E ECG Amplifier Adjustments 5 10 ECG Amplifier Reference Voltage 5 11 ECG Isolated Power Supplies 2 5 ECG Printout 1 13 ECG Recording Screens 1 3 ...

Page 138: ...19 Noise Damping 2 6 O Obtaining a printout of all current settings 1 30 Opening the Case 4 8 4 10 Operating Philosophy 1 3 Ordering Information 6 2 P Paper Mark 2 5 Paper Mark Detector Adjustment 5 8 5 9 Patient Cable Resistance 5 13 Phone No 1 28 Physical Overview 4 5 Physicians s Responsibility iii Posterior 1 19 Potential Equalisation 1 7 Power Indicator symbol 1 6 Power On Reset 2 5 Power Sup...

Page 139: ...ude Lead 1 22 Stage Printout Format 1 22 Standard 7 7 Stepper Motor Controller 2 5 Stress Settings 1 20 Switching On and Off 1 6 System 7 3 System Option 5 14 5 15 5 16 5 17 System Settings 1 25 T Terms of Warranty x Test Equipment 5 5 Thermal Print Head Controller 2 4 Tools 4 8 Top Assembly Removal 4 9 Top Assembly Replacement 4 11 Treadmill Protocols 1 24 U Udif 5 13 Unit Defaults 1 34 Uoff 5 13...

Page 140: ...Index 5 Article Number 2 540 028 SCHILLER AG 2002 AT 102 Service Handbook Index ...

Reviews:

No comments

Related manuals for AT-102

Brand: GE Pages: 138

Brand: NARGESA Pages: 50

Brand: ICELED Pages: 4

Brand: Facom Pages: 4

Brand: FaceLake Pages: 2

Brand: Laserworld Pages: 8

Brand: Laserworld Pages: 6

Brand: LaserLiner Pages: 56

Brand: LaserLiner Pages: 54

Brand: Mackie Pages: 18

Brand: Mackie Pages: 2

Brand: Mackie Pages: 8

Brand: Mackie Pages: 7

Brand: Yamaha Pages: 139

Brand: Yamaha Pages: 19

Brand: Yamaha Pages: 32

Brand: Jackson Pages: 2

Brand: Vag Pages: 10

Brands by name

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Popular brands

Load more brands