MEDICAL LCD DISPLAY
Contents
1. 60 80 80 or 55 65 RGB simulation 0 7V p p TTL positive or negative polarity VGA SVGA XGA WXGA 15 pin D sub or DVI D Option Power switch LED indicator OSD menu button auto setting DICOM OSD Function Contrast brightness auto adjustment image level phase image h position image v position OSD h position OSD v position color temperature RGB language Adaptor AC input 100V 240V 50 60Hz Adaptor DC output 12V 3A Max Power consumption 100 W Working environment Temperature 0 C 50 C Humidity 20 80 Storage environment Temperature 20 C 60 C Humidity 20 80 Packing dimension LxWxH 570 210 470mm Weight Kg N W 8KG G W 10KG page 16 TECHNICAL SPECIFICATION Gradation Display 11 bit LUT Calibration standard DICOM Part 14 Calibration Port USB Calibration tools ARMSTEL lux Meter ARMSTEL Amedicom Calibrator In put Grayscale 8 bit 10 bit resolution Requires ARMSTEL Viewer Application page 17 OPERATION 4 2 ARMSTEL lux meter specification ARMSTEL lux meter is a dedicated luminance meter for medical LCD display DICOM Part 14 calibration The lux meter works with ARMSTEL AMEDICOM Calibrator to measure up to 2048 grayscales that ARMSATT technology can generate on a 8 bit color LCD display Those 2048 grayscale luminance levels are measured and transmitted to the computer via USB connection ARMSTEL AMEDICOM ca2. hnology based DICOM compliant clinic medical display function Any time user friendly DICOM calibration with the ARMSTEL lux meter and calibration software via dedicated USB port on the display External Power Supply to extend the life of ARMSTEL dual mode medical LCD display Pivot 90 degree turn landscape portrait Swivel 180 degree Extendable back support Build in DICOM calibration to 11 bit grayscale 2048 grayscale luminance page 4 INSTALLATION levels accuracy to comply with the DICOM GSDF Part 14 standard 8 bit 10 bit 11 bit display grayscale bit support 1 3 Packing list Please make sure the following items are included with your LCD display before installation ALCD monitor with pedestal AVGA signal cable DVI D signal cable AUPS cable A power cord An AC adapter ADICOM medical display calibration lux meter Down loadable DICOM calibrator softaware free from ARMSTEL Corporate Webside User s manual qualification and warranty cards If any of there items are missing please contact with your dealer for technical support and customer service 1 VGA signal input jack 2 DVI signal input jack 3 Power jack USB Port IDC port page 5 INSTALLATION _ 1 VGA signal input connect to computer VGA signal output jack 2 DVI signal input connect to computer DVI signal output jack 3 Power ja
3. normal work after 20 minutes the darkness and facula will disappear at this time G The image is distorted to flash and shake Check the set of computer and choose the proper resolution then readjust and renovate the resolution H The color is abnormal Check the connection of signal cable if there is any curved or broken pin please replace it Enter the OSD color adjustment menu to set the display color to the optimum page 26 Contents of the Package LCD Monitor Reference only the real feature is depended on selected model Monitor Base Accessory Power Cord VGA Cable SUB Cable Lex meter O AO DVI Cable User s Manual Adaptor AMEDICOM calibrator Installation and Removal INSTALL Turn the connecting screw at the bottom of the stand fully so that it is completely fixed Removing the Stand Turn the connecting screw at the bottom of the stand to separate it I O Ports Connection T GY Gy i j DVI CABLE 3 mal VGA Cable pa g SUB Cable SIE a E
4. 640x480 31 469 59 940 720x400 31 469 70 087 800x600 48 077 12 188 11 1024x768 60 023 15 029 1280x960 60 000 60 000 1366x768 79 976 60 000 1440x900 55 935 60 000 page 12 OPERATION 20 1600x900 79 976 60 000 21 1680x1050 65 290 60 000 1600x1200 75 000 60 000 1920x1080 79 796 60 000 Note 15 15 6 LCD Monitor is applied to items 1 18 recommended mode 17 19 LCD Monitor is applied to items 1 20 recommended mode 20 23 LCD Monitor is applied to items 1 24 recommended mode 24 LCD Monitor is applied to items 1 26 recommended mode 26 LCD Monitor is applied to items 1 26 recommended mode 3 5 Power management system This monitor complies with EPA Energy Star and is compatible with VESA DPMS standard the saving mode is shown as below Mode Power Indicator Power Consumption 21 6 Normal blue lt 40W Standby Saving red orange lt 1W Power Off turn off lt 1W DICOM purple lt 40W page 13 TECHNICAL SPECIFICATION 3 6 DICOM GSDF Part 14 calibration The ARMSTEL AMEDICOM medical display has the buil in calibrated DICOM GSDF compliant BARTEN curve for medical image display with patented pending ARMSATT technology embedded To adjust the display from shifting away fromthe DICOM characteristic display f unction ARMSTEL provides a dedicated tool for user to calibrate the display lookup table whenever needed The tools include a software and a lux met
5. adjustment menu Auto adjust with this button to adjust the display to optimum H position adjustment use or to adjust the horizontal position to optimum Audio adjustment menu El MENU Select Move V position adjustment use or 4 to adjust the vertical position to optimum Volume use or to adjust the volume to optimum option Image position level clock set use gt or to adjust the image position level Mute use or to select Mute Sound to optimum Return back to previous menu Phase adjustment use or lt to adjust the focus and definition to optimum Return back to previous menu yy Ge CS D NES Gs a E menu Select H Move El MENU Select Fl Move page 9 page 10 OPERATION System setting menu Language use P or lt to select desired language Menu display time use gt or lt to select the desired time for menu display Saving time use or to select desired time for display so as to meet your requirement Reset reset all the set value to factory setting Return back to previous menu 4 3 when setting OFF it is normal display mode when setting ON it will be 4 3 display mode DCR Optional To open or shut off contrast ration by setting ON OFF MESES Return Language OSD Timeout Power Save Reset ATS DCR Wen USER ES L English 60 8 OFF ON OFF 1280X1024075Hz vf Exit and signal resource
6. reference 3 Unplug this device from the wall outlet before cleaning Do not use liquid cleaners or aerosol cleaners Use a damp or wet cloth to clean Please use LCD screen detergent for cleaning if it is still dirty 4 Do not use the parts not recommended by the manufacturer otherwise it may cause a hazard 5 When unplugging the power cord of the monitor or adapter please hold the plug with your hand do not pull the cord directly 6 Do not place any object on the power cord Do not trample it either 7 Do not use the device near water sources e g bathtub basin kitchen sink or washing machine Do not place the device on a wet floor or near a swimming pool etc Do not touch the screen with your fingers or other hard objects 8 Slots and openings on the housing and its back or bottom are provided for ventilation To ensure reliable operation of the components and to protect them from overheating these openings must not be blocked or covered placing the device on a bed sofa rug or other similar surface The device should never be placed near or over a radiator or heater and should not be placed in a built in installation unless proper ventilation is provided 9 Make sure that the device is at least 5cm distance from the wall or other objects around when it is in use 10 The power supply must respond to that stated on the rating plate If you have any query about the power supply please refer to the dealer or local power suppl
7. 21 6 DUAL M 2MP11 bit MEDICAL LCD DISPLAY EMC COMPLIANCE IMPORTANT PRECAUTIONS Introduction Installation Operation Technical specification Trouble Shooting USER MANUAL Table Of Contents ENC COMPLIANCE cessere riS 1 IMPORTANT PRECAUTIONS ECE AE da E E A T T 2 lago o PP AE 4 1 4 General A A RS eee ae ces 4 1 2 FeatureS eeeertetttstrtrrrrrrrrrrrrrrrrrrrrrrnrrrrrrrrnrrrrrnrrrnrrrenunernnernnnnunnnnnnnnn 4 1 3 Packing List octetos 4 2 InstallatiOnN 00ooooooooooooncococonononconnnononconnnnnnnnonnnnnnnnnnnnnnnzs 5 2 1 Connection of signal cable A Swine aca aaa ADA A Rudd A ae RRE wee ama aR Aum das E aR oR Ou ce ma 5 22 Connection of power cord A eats Sarena See eee 5 2 3 Power on hcg ace ds Ga RAR AMARA sa iat alo wh AREA E ARRE E RRA RA AAA AR raat Rh eon ars wan 6 24 Self inspection ORO 6 2 5 Image Adjustment A AA A ies aun eect ee va tera A ata exece 6 3 Operation ee ee E ne eT Tere ae meee A 7 3 1 i OSD button NR 7 3 2 OSD menu and operation menu introduction ss 9 3 3 Safeguard arto rada star art laa oa 12 3 4 Power management system A a tales alec A E E E E tay aa ete ene ee 12 35 Setting of display MORA 13 36 DICOM GSDF Calibration ccc 14 3 7 DICOM mode setting CONC uo a nae RRA REG we Aaa aad awk ates o 15 4 4 Technical specification A 16 4 1 21 6 dual mode 2 MP 11 BIT mdeical LCD display specification 16 4 2 ARMSTEL Lux meter specification ada 18 4 3 ARMSTEL Amedicom Calibr
8. ator specification 18 4 4 Pin assignment of signal cable id a eects eaten eee a 18 5 Trouble Shooting A A 20 EMC COMPLIANCE EMC COMPLIANCE This device has been tested and found to comply with the standards for a class B digital device pursuant to Part 15 of FCC Rules Those standards are designed to provide reasonable protection against harmful interference in a residential installation This device generates and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications If this device does cause harmful interference to radio or television reception which can be determined by turning the device off and on user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the device and receiver Plug the device into a wall outlet different from that connected to the receiver Consult the dealer or an experienced radio TV technician for help CAUTION any change or modification not expressly illustrated in this manual may void the warranty 1 NOTE any unshielded cable is not allowed to be used in the device page 1 IMPORTANT PRECAUTIONS IMPORTANT PRECAUTIONS A WARNINGS 1 Before using this device please read all the instructions in this manual carefully 2 Please keep the manual carefully for future
9. calibrate the LCD 1 Click Calibration gt Generate Grayscale Luminance gt Generate Table with 512 Luminance Levels inl x File Calibration View Help Generate Greyscale Luminance Generate Table with 2048 Luminance Levels Generate Barten Calibration Table gt Generate Table with 1024 Luminance Levels Set LCD Display Characteristic Curve Generate Table with 512 Luminance Levels Quick Calibration gt Generate Table with 256 Luminance Levels 2 Awarning dialog pops Waning eee This process will take about 15 minutes Click OK to proceed The LOD will turn to black to enter grayscale generation mode Click CANCEL to exit grayscale generation cna Click OK page 19 OPERATION 3 Wait about 15 minutes when complete a dialog pops AAA Grayscale generate completed do you want to save the Greyscale Luminance Table Click OK to save the table Click CANCEL to discard the table cee Click OK to save the grayscale file 4 Click Calibration gt Generate Barton Calibration Table gt Generate Barton Table with 512 Luminance level Armstel Amedicom Calibrator loj x File Calibration View Help Generate Greyscale Luminance Generate Barten Calibration Table Generate Barten Table with 2048 Luminance Levels Set LCD Display Characteristic Curve Generate Barten Table with 1024 Luminance Levels Quick Calibration Generate Barten Table with 512 Luminance Level
10. ck connect to adaptor DC output jack 4 USB Port connect to computer for DICOM GSDF Calibration 5 IDC Port to connect to ARMSTEL technical support tool NOTE This port is only used by ARMSTEL technical support personnel not for customer use 09 NO IN 2 1 Connection of signal cable Before connecting your monitor and PC with signal cable please turn off your monitor and computer And then insert one end of the signal cable into the VGA or DVI jack on your computer and lock it with two fixed screw for ensured grounding Finally please insert other end of signal cable to the VGA or DVI signal input jack of monitor and lock it with fixed screw 2 2 Connection of power cord First insert one end of power cord into the input jack of adaptor and another end into power outlet then insert the output terminal of adaptor into the power input jack of monitor 2 3 Power on Turn on the monitor and computer and then indicator will light green or blue when the screen is under normal condition Please check to see if there is any wrong with the connection of video signal cable if the indicator lights red orange 2 4 Self inspection If the monitor inspects there is no horizontal and vertical signal it will prompt to check the video input please refer to the illustration below and the monitor will enter into power saving mode after several seconds the indicator will light red orange NO SIGNAL The screen will restore to no
11. e The LED light remains flashing Push Dicom again to switch back to normal LCD display function The LED light turns purple When DICOM mode is selected All other OSD button functions are disabled except power button Note the default power up mode is normal LCD display mode page 8 OPERATION OPERATION 3 2 OSD menu and operation menu introduction ES Press the MENU to call out the OSD menu main menu please see the ustat nas Below Red Green Blue color ACJUSIMENI use or to adjust the value of red With gt or lt to select the desired items and then press the MENU button for green and blue to change the image color ae to meet your needs adjustment with gt lt the selection buttons on the front of case button to adjust Color temperature use gt or to select desired color temperature 9300k the display items to optimum press again for confirmation and exit adjustment 6500k USER Color adjustment it can be adjusted if under shadow mode If you are not Brightness use or to adjust the brightness to optimum satisfied with the color temperature set by manufacturer you may set the color Contrast use gt or lt to adjust the contrast to optimum temperature to USER mode it will light red at this time When enter adjust Return back to previous menu menu please use or to adjust R G B to change the color of image Return back to previous menu MEN ES bs a MIES MEMES E MENU Select Move Image
12. er coming with the LCD display ARMSTEL AMEDICOM Calibrator software provides a user control function to calibrate the DICOM GSDF Barten curve on site to prevent the shifting The software allows user to calibrate at different levels of accuracies i e using 2048 1024 512 or 256 grayscales grayscale luminance levels to interpolate the Barten curve Using 2048 grayscales takes approximately 40 minutes to restore the default setting whereas 1024 takes around 20 minutes 512 grayscales calibration takes about 10 minutes while 256 grayscales takes less than 5 minute to complete the calibration Calibration steps are as follows 1 Install ARMSTEL AMEDICOM Calibrator software by following the prompted up instructions The software supports Window 98 XP Vista Win7 OS 2 Connect LCD display USB to the computer using the USB wire that comes with the LCD display 3 Connect ARMSTEL lux meter to the computer 4 Fix the lux meter on the LCD screen by the suction cup on the lux meter 5 Double click to run ARMSTEL AMEDICOM Calibrator software installed above 6 For Amedicom Calibrator software function refer to section 4 3 for details Note user needs to the right luminance table and the corresponding Barten table generated by the software to set the LCD display in the calibration page 14 OPERATION 3 7 DICOM mode setting When LCD display is powered up by default the LCD working mode is set to normal color LCD mode All OSD ope
13. humidity 20 Store the device at a place at 20 C 55 C room temperature Otherwise it may cause permanent damage page 3 INTRODUCTION 1 Introduction 1 1 General Thank you for purchasing the latest ARMSTEL AMEDICOM model of dual mode LCD monitor with advantages of high display performance and light weight etc meanwhile with the power saving and no radiation features The latest ARMTEL dual mode medical LCD will bring you comfortable safe and environmental protection brand new visual experience with guaranteed DICOM adjustable medical clinic medical display functions The AMEDICOM has the most advance ARMSTEL patented medical display solution ARMSATT tech nology patent pending to provide the clinic practitioners with the most conve nient LCD monitor solutions Your purchase and use of this product are highly appreciated 1 2 Features High performance intelligent frequency scanning use active matrix Thin film transistor liquid crystal display TFT Micro Computer digital technology control no radiation no glare Comply with VESA DPMS International Power Saving Regulation Support DDC 1 2B and Windows PNP Plug amp Play Microprocessor based with OSD On Screen Display control be able to adjust the image to optimum Built in hoisting hole complying with International Standard VESA which is able to hang the display on the wall Single DICOM button push to select ARMSTEL patented ARSMATT tec
14. librator collects the data and calibrate the BARTEN curve based on the grayscale luminance values sent from the lux meter and set the LCD display with the correct DICOM GSDF characteristic display function via USB connection from the computer to the LCD display USB port Sensor Silicon photodiode Optical Wavelength coverage 350 600nm Measuring range 0 2000 Lux Accuracy 3 Rdg 0 5 F S while the ambient temperature is 23 5 C Resolution 0 01 Sampling rate 1 s Repeatability 2 USB USB2 0 USB cable length 1 5M 4 3 ARMSTEL AMEDICOM calibrator specification ARMSTEL AMEDICOM Calibrator is an ARMSTEL owned software package for calibrating the DICOM GSDF Part 14 display characteristic function The software can provide user the control over the ARMSTEL AMEDICOM medical LCD display calibration on site any time user needs The calibration software provides user different accuracy of calibration on site depending on interval between calibrations The following is the example demonstrating the use of ARMSTEL Amedicom Calibrator software to calibrate ARMSEL Amedicom dual functional medical LCD display First of all to go ARMSTEL s corporate website to down load the Amedicom Calibrator software by registering the customer information After the down loading page 18 OPERATION install the software on our preferred local file directory and run the software After starting the software user follows the following steps to
15. p 7 and Click OK 10 A message Box pops barten CSY E x Loading Look Up Tabal Successful Click OK to write the Barten Curve to the LCD 11 Wait a few seconds After done a message Box pops to indicate writing Barten Curve to LCD is done Ito x Writing LUT Succeed 12 Click OK to finish calibration page 23 OPERATION Quick Calibration 1 Click Calibration gt Quick Calibration gt Calibrate with 512 Luminance levels Armstel Amedicom Calibrator 3 jol xj File Calibration View Help Generate Greyscale Luminance Generate Barten Calibration Table Set LCD Display Characteristic Curve Quick Calibration Calibrate with 2048 Luminance Levels Calibrate with 1024 Luminance Levels Calibrate with 512 Luminance Levels Calibrate with 256 Luminance Levels Generating Gray Scale Luminance Gray scale 2047 Luminance 294 970000 2 Awarning dialog pops Warning hl This process will take about 15 minutes Click OK to proceed The LCD will turn to black to enter grayscale generation mode Click CANCEL to exit grayscale generation cns Click OK 3 Wait about 15 minutes every thing will be done and a message box pops CO x writing LUT Succeed 4 Click OK to finish calibration page 24 TECHNICAL SPECIFICATION 4 4 Pin assignment of signal cable ES 1 Red 9 DDC Power EXC CITI s Bue Ground re Rea G
16. rations are working for the color LCD display setting User selects DICOM working mode by pushing the DICOM button once When LCD is setto workin DICOM mode the LED of display will remain purple status All the corresponding DICOM viewers grayscale image display will trigger ARMSTEL s ARMSATT technology to apply DICOM GSDF Part 14 required display function for the medical image presentation The color LCD OSD functions are disabled and the Gamma display curve is set to default one for color image display Under the DICOM mode the only functional button is power button unless user switch back to normal LCD display mode LED turn blue User can switch to normal color monitor working mode by pushing the DICOM button again under the DICOM mode LED indicates flashing Once the LCD is switched back to normal color LCD mode the full OSD functions are back to work page 15 TECHNICAL SPECIFICATION 4 Technical specification 4 1 21 6 DUAL MODE Medical LCD display specification 21 6 10 9 Screen model 21 6 Active Matrix TFT LCD Dot pitch Hx V 0 248x0 248mm Surface treatment Anti glare Active display area H x V 304mmx228mm Max Resolution 1920x1080 Contrast 300 1 1000 1 Brightness 300cd m 500cd m Responsive time 5ms Display color Visible angle left right up down Input signal video signal synchronization Display format Signal connector Panel button 16 777 ten thousand color 80 80 or 60
17. rmal display once receiving video signal 2 5 Image Adjustment Please adjust the image according to your need please refer to the Operation in Section Three page 6 OPERATION 3 Operation 3 1 OSD button O O O e e DICOM AUTO MENU lt gt D 1 Power Switch Digital control light touch switch used for turning on or off monitor power 2 Power Indicator e When the monitor is under normal working condition the indicator will light green or blue if the monitor is under saving mode the indicator will light red orange or off And the indicator will turn off under the power off mode When the power indicator turns off it means that the monitor is under off mode but please pay attention that the adaptor is still in charge so please disconnect the adaptor when the monitor is not used for the purpose of safety page 7 OPERATION 3 Menu Button Activate OSD enter sub menu select items confirm selection 4 AUTO Button Automatically set the screen display to optimum 5 UP Button Select and adjust the OSD items Increase the value 6 DOWN Button Select and adjust the OSD items Decrease the value 7 Button Choice options and adjust brightness 8 o Button Contrast option to choose and adjust 9 DICOM Button Push DICOM button to activate ARMSTEL s patented Dicom technology for medical display function When LCD display is in DICOM mod
18. round 14 v 5 e Bwcs 4 5 Visual Inspection Even the normal pixels on the LCD screen reach 99 99 or higher there may be 0 01 or less pixels showing dark or light while displaying page 25 TROUBLESHOOTING 5 Troubleshooting If your monitor cannot work normally please refer to the follow methods for common problems quickly if you need assistance please call the dealer where you purchased the Monitor A There is no Screen Image LED no light Please check to see whether the power cord is securely connect to the monitor and wall outlet and whether the display is in power saving mode B There is no Screen Image LED light red Please to see whether the display card of PC is loosed and check the connection between signal cables and display C The display is not clear or the image is too large or too small Enter the OSD image adjustment menu and then select Auto Adjust to make the display to adjust automatically to optimum D The image is too light or too dark Enter the OSD brightness adjustment menu and then select the to adjust the brightness and contrast to optimum E The screen is overheated Please keep at least 5cm around the display for ventilation and do not place anything onto the monitor F Dark display after power on facula This is normal Due to the temperature difference the backlight will not give out light equably at the beginning of powering on but the backlight lamp will come to
19. s Generate Barten Table with 256 Luminance Levels Ready page 20 OPERATION 5 a open file dialog pops My Recent Documents Desktop i My Documents gr hy Computer Cancel E J My Network File name EE Places l Files of type Look Up Table Files cs Select the grayscale file you just saved in step 3 and click OK 6 A warning message box pops grayscale CS x Loading Gray Scales Luminance Tabal Successfull Click OK to generate Barten Calibration Table page 21 OPERATION 7 After Barten Calibration Table is generated successfully a message box pops Complete x Generate Barten Calibration Table Completed Click OK to save the Barken Calibration Table Click CAMCEL to discard Barten Calibration Table Cancel Click OK to save the Braten Calibration Table 8 Click Calibration gt Set LCD Display Characteristic Curve File Calibration View Help Generate Greyscale Luminance Generate Barten Calibration Table Quick Calibration Gray scale 2047 Luminance 294 970000 Generating Gray Scale Luminance page 22 OPERATION 9 A open file dialog pops open Look in O Amstel e aa j 4 My Recent Documents Desktop ti barten cS o My Documents Fr My Computer z AO File name Places Files of type Look Up Table Files csv y Cancel Select the barten table you just saved in Ste
20. selection menu Select terminal input select input terminal for signal input option Exit exit OSD menu A Exit VGA DVI Wen USER zA P Ea Fin A 3 y 1280X1024075Hz Note Hot Key of volume brightness contrast Without OSD mode your may press lt button to call volume adjustment directly when the volume menu is not exit please press MENU to call brightness and contrast adjustment you may use to adjust it to optimum page 11 OPERATION 3 3 Safeguard When the video signal of your computer exceeds the frequency range of monitor refer to product specification the micro computer of monitor will turn off the sync signal of horizontal and vertical for the purpose of monitor protection please refer to the illustration below The monitor will enter saving mode after a few seconds and the power indicator will light red orange Please set the output frequency of your computer OUT OF RANGE within the acceptable range of monitor so that the monitor can work normally 3 4 Setting of display mode With standard VESA and DDC function the monitor will scan frequency output power performance etc and transfer to PC after turning on when you use the video card with VESA DDC1 2B function And it will identify the connection mode of display and select the proper resolution The preset mode before leaving factory is as below Mode Resolution Horizontal KHz Vertical Hz 1 640x400 31 469 70 087
21. y provider 11 As a safeguard measure the monitor or adapter is equipped with a power cord with three terminal plug the third terminal is grounded If the plug cannot be inserted into the outlet please contact an electrical technician for replacing the original outlet while keeping the safeguard measure in effect 12 Ensure that the power socket and cord in use are able to take the sum of the rated currency of all the products 13 Do not put the device at the place where user is subject to mal operation page 2 IMPORTANT PRECAUTIONS 14 Observe all the warnings and instructions described in the manual 15 Do not overload the power outlet or use any extension cord otherwise it may cause fire or electric shock 16 Do not attempt to repair this device yourself since opening or removing covers may expose you to dangerous voltage or other hazards Refer servicing to qualified service personnel 17 Unplug this monitor or AC adaptor from the wall outlet and refer servicing to qualified service personnel under the following conditions a When the power cord or plug is damaged or worn b If the device has been dropped or its housing has been damaged c When the performance of the device deteriorates distinctly 18 The power cord is the main facility to turn on off the device unplug it if the device is not used for a long period of time 19 Store the device at a place of good ventilation avoid strong sunlight high temperature or
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