Philips 170C5 Service Manual Download

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170C5 LCD

Go to cover page

ATTENTION SIGNAL

OSD MAIN CONTROLS UNLOCKED

ATTENTION SIGNAL

OSD MAIN CONTROLS LOCKED

ATTENTION SIGNAL

CHECK CABLE CONNECTION

ATTENTION SIGNAL

WAITING FOR AUTOMATIC ADJUSTMENT

AGING...

After 15 seconds, bring up:

AGING...

After 15 seconds, bring up:

----------
----------
repeatly
Connect Signal cable again=> go back to normal display

Access Aging.. Mode

Step 1 : Turn off LCD monitor, and disconnect Interface Cable betwe-
en Monitor and PC.
Step 2 : [Push AUTO "

" & "

" buttons at the same time and

hold it]+[Press power "

" button untill comes out " AGING screen"

] => then release all buttons.

Bring up:

Summary of Contents for 170C5

Page 1: ...ge Function Block 25 Scaler Diagram 26 29 Control Diagram C B A 32 Power Diagram 33 34 Exploded View 36 Recommended parts list 37 General product specification 40 65 ISP Instructions 22 23 Safety Test Requirements 24 Scaler Board C B A 30 31 Power board C B A 35 Spare parts list 38 39 REFER TO BACK COVER FOR IMPORTANT SAFETY GUIDELINES CAUTION USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHE...

Page 2: ...ymbol on the schematics or exploded views Use of substitute replacement parts which do not have the same specified safety characteristics may create shock fire or other hazards Under no circumstances should the original design be modified or altered without written permission from Philips Philips assumes no liability express or implied arising out of any unauthorized modification of design Service...

Page 3: ... to cover page Support Color Type NR 1 2 7 Controls Front side DC power switch OSD function key OK UP DOWN Brightness key LEFT RIGHT Input Select AUTO key Rear side D SUB signal connector Power cord socket ...

Page 4: ...ays at 34 preset modes 2 Screen displays perfect picture at 15 preset modes 3 Screen displays visible picture with OSD warning when input modes are other then 34 preset modes 2 1 3 Timing requirements The analogue color LCD monitor must be capable of displaying standard resolutions within the vertical frequency range of 56 76 Hz the horizontal scan range of 30 82 KHz and others modes which be defi...

Page 5: ... OK button which when pressed will take you to the OSD controls LEFT and RIGHT buttons like the UP and DOWN buttons are also used in adjusting the OSD of your monitor Power LED POWER button switches your monitor on Rear view 1 Kensington anti thief lock 2 VGA input 3 AC power input Accessory Pack Unpack all the parts Item Description 1 Power Cable socket may differ for different countries 2 Macint...

Page 6: ...rn off your computer and unplug its power cable b Connect the monitor signal cable to the video connector on the back of your computer c Plug the power cord of your computer and your monitor into a nearby outlet d Turn on your computer and monitor If the monitor displays an image installation is complete Remove the cover Plug the power cord into monitor firmly ...

Page 7: ...5 LCD Go to cover page The OSD Tree Below is an overall view of the structure of the On Screen Display You can use this as a reference when you want to work your way around the different adjustments later on ...

Page 8: ...JUSTMENT AGING After 15 seconds bring up After 15 seconds bring up AGING After 15 seconds bring up repeatly Connect Signal cable again go back to normal display Access Aging Mode Step 1 Turn off LCD monitor and disconnect Interface Cable betwe en Monitor and PC Step 2 Push AUTO buttons at the same time and hold it Press power button untill comes out AGING screen then release all buttons Bring up ...

Page 9: ... sub pixels that are always dark or off These are the types of black dot defects One da BLACK DOT DEFECTS ACCEPTABLE LEVEL MODEL 150C5 170C5 1 dark subpixel 4 or fewer 4 or fewer 2 adjacent dark subpixels 2 or fewer 2 or fewer 3 adjacent dark subpixels 0 0 Distance between two black dot defects 15 mm or more 15 mm or more Total black dot defects of all types 4 or fewer 4 or fewer TOTAL DOT DEFECTS...

Page 10: ...c adjustments are completed No 6 USE 1024 X 768 FOR BEST RESULT On top of OSD main menu The message will show up at the top of the OSD main menu in red color when the input resolution is not the 1024x768 Yes 7 OSD MAIN CONTROLS LOCKED 3 secs or Till OSD MAIN CONTROLS UNLOCKED appear This message will appear 3 seconds to indicate the OSD MAIN CONTROLS status when to lock or un lock it by pressing M...

Page 11: ...8 OFFSET2 R Xxx G xxx B xxx GAIN R Xxx G xxx B xxx M 255 m 0 AUTO SUB OK OSDTIMER 60 IDX 40 OFFSET1 R Xxx G xxx B xxx SCALER ADD VAL READ WRITE NVRAM ADD VAL READ WRITE PANEL LG 17 1024x768 48 3KHz 60Hz BL blacklevel value SUB BRI Brightness value range Min Max SUB CON Contrast value range Min Mid Max SRGB B Brightness of sRGB SRGB C Contrast of sRGB Gain m Minimum value of User Gain Gain M Maximu...

Page 12: ...12 170C5 LCD Go to cover page ...

Page 13: ...ig 4 and the open the click as Fig 5 Fig 4 Open the clicks and then remove the back cover as Fig 6 and Fig 7 Fig 6 Fig 7 Remove the Matel frame board Remove the four screws and Disconnect D SUB hexagonal screws as shown in Fig7 Remove the matel frame board as shown in Fig 8 Fig 8 Remove the power and scaler board unscrew the screws and disconnect the connector as shown in Fig 9 Fig 5 ...

Page 14: ...14 170C5 LCD Go to cover page Fig 9 Fig 10 Fig 11 Fig 12 ...

Page 15: ...15 170C5 LCD Go to cover page ...

Page 16: ...DID information may be also obtained from VESA 1 An i486 or above personal computer or compatible 2 Microsoft operation system Windows 95 98 Y o Install the EDID_PORT_Tool under Win2000 XP As Fig 1 A Cody the UserPort sys to C WINNT system32 drivers win2000 C WINDOWS system32 drivers winXP B Running io exe everytime Before you start to programming edid data 4 A D Alignment kits 3138 106 10079 incl...

Page 17: ...error message as shown in Fig 8 before entering the main menu Meanwhile the read EDID function will be disable At this time please make sure all cables are connected correctly and 3 At the submenu type the letter of your computer s hard disk drive followed by EDID45 for example C EDID45 as shown in Fig 6 1 Fig 4 PC 1 Power connector 2 D SUB connector To printer port LTP1 DC Power 8 12 V Printer Po...

Page 18: ...rovides the function selection and text change select fill out from Step 1 to Step 9 Step 4 Modify DDC data Monitor Serial No Next 1 Click bring up Fig 15 2 Click bring up Fig 16 Next 3 Click OK button to confirm your selection 4 Click icon Read EDID function to read DDC EDID data from monitor The EDID codes will display on screen as shown in Fig 13 Fig 15 Fig 16 2 Select the DDC2Bi as the communi...

Page 19: ...Next 7 Click bring up Fig 21 Next 4 Click bring up Fig 18 Next 5 Click bring up Fig 19 Next Fig 22 6 Click bring up Fig 20 Next Serial number can be filled up or be changed at this moment Fig 20 8 Click bring up Fig 20 Next 170C5 LCD Go to cover page 19 ...

Page 20: ... DDC program Pull down the File menu and select Exit as shown in Fig 25 Step 5 Write DDC data 1 Configuration should be as Fig 23 And press OK 3 Click Write EDID icon from the tool bar to write DDC data Bring up Writing 0 100 ready a progressing bar on the left down corner 4 Turn off on monitor 5 Press the OK button to bring up the OSD main manu 6 Press the DOWN button to select PRODUCTION INFORMA...

Page 21: ...atio 4 3 Refresh Rate 60 Standard Timing Identification 4 Horizontal active pixels 1280 Aspect Ratio 5 4 Refresh Rate 60 Detailed Timing 1 Pixel Clock MHz 108 H Active pixels 1280 H Blanking pixels 408 V Active lines 1024 V Blanking lines 42 H Sync Offset F Porch pixels 48 H Sync Pulse Width pixels 112 V Sync Offset F Porch lines 1 V Sync Pulse Width lines 3 H Image Size mm 338 V Image Size mm 270...

Page 22: ... 106 10396 is provided by Novatek to upgrade the firmware of CPU is for the interface between Parallel Port of PC and 15 pin D SUB connector of Monitor It is a windows based program which cannot be run in MS DOS System and equipment requirements 1 An i486 or above personal computer or compatible 2 Microsoft operation system Windows 95 98 2000 XP 4 as shown in Fig 1 3 ISP Software Easywrite DDC2BI_...

Page 23: ...age coming as shown in Fig 13 you have to check the AC power Video cable or Novatek MCU Fig 9 Fig 10 Fig 11 Fig 12 Fig 13 170C5_Novatek_V200_20040623_5F79 hex 170C5_Novatek_V200_20040623_5F79 hex 170C5_Novatek_V200_20040623_5F79 hex Note 313810610079also can be used for firmware upgrade the operations is the same as described above but you should connect the monitor as below PC To pri nter port LT...

Page 24: ...et at 100 uA 5 mA 0 09 Rohm current for Max R is the Tester limitation set resistance of at 0 1 uA for the mains cord Min Limitation Ramp set at 2 time seconds Tester Test method Condition HiPot Test for HiPot Test for Ground Continuity products where products where Test requirement the mains input the mains input is range is Full 110V AC USA range or 220V type AC 2 2 1 The minimum test duration f...

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Page 36: ...3815757381 BEZEL ASSY 30 103 313815413771 REAR COVER 104 313815135051 AC BRACKET 100 313815756281 SHIELDING ASSY 40 313815757391 BACK COVER ASSY 50 313815757341 DETACHABLE BASE 313815413821 108 HINGE COVER L ...

Page 37: ...0079 RES XTL SM 12MHZ 32P 49S R 6205 932209863685 DIO SIG SM BAV99 VISH R 6206 933137390215 DIO REG SM BZX84 C5V1 PHSE R 6207 933137390215 DIO REG SM BZX84 C5V1 PHSE R 6208 933137390215 DIO REG SM BZX84 C5V1 PHSE R 6209 933137390215 DIO REG SM BZX84 C5V1 PHSE R 7202 935260739118 IC SM 74LVC14APW PHSE R 6302 933976370215 DIO SIG SM BAT54C PHSE R 6304 932209863685 DIO SIG SM BAV99 VISH R 7301 932220...

Page 38: ...878615649 CER2 0603 X7R 16V 1N PM10 R 2229 223878615649 CER2 0603 X7R 16V 1N PM10 R 2234 223878615649 CER2 0603 X7R 16V 1N PM10 R 2235 223878615649 CER2 0603 X7R 16V 1N PM10 R 2236 223878615649 CER2 0603 X7R 16V 1N PM10 R 2237 223878615649 CER2 0603 X7R 16V 1N PM10 R 2238 223878615649 CER2 0603 X7R 16V 1N PM10 R 2239 223878615649 CER2 0603 X7R 16V 1N PM10 R 2240 223878615649 CER2 0603 X7R 16V 1N P...

Page 39: ...ONTROL ASSY 1901 242212803058 SWI TACT 1P 50MA 12V TSAA B 1902 242212803058 SWI TACT 1P 50MA 12V TSAA B 1903 242212803058 SWI TACT 1P 50MA 12V TSAA B 1904 242212803058 SWI TACT 1P 50MA 12V TSAA B 1905 242212803058 SWI TACT 1P 50MA 12V TSAA B 1906 242212803058 SWI TACT 1P 50MA 12V TSAA B 1907 242212803058 SWI TACT 1P 50MA 12V TSAA B 6901 932219981682 LED VS L 3WYGW 8 03 KIEL B 3902 232270260473 RST...

Page 40: ...RESET MODES AND 34 PRESET MODES WHICH CAN BE RECOVERED TO PRESET MODES USER FRIENDLY OSD DISPLAY FOR MODE IDENTIFICATION ADJUSTMENT DDC 2B COMMUNICATION CAPABILITY MAX RESOLUTION 1280 1024 NON INTERLACED AT 75 HZ 17 COLOR TFT LCD FLAT PANEL EASY TILT SWIVEL BASE FULL RANGE POWER SUPPLY 90 264 VAC CE ENVIRONMENTAL POLICY ANTI GLARE TO REDUCE LIGHT REFLECTION POWER MANAGEMENT CAPABILITY SOG SUPPORT ...

Page 41: ...ectrical characteristics 3 1 Interface signals 3 2 Interface 3 2 1 D sub cable 3 2 2 OSD function control 3 3 Timing requirement 3 3 1 Mode storing capacity 3 3 2 Factory preset timings 3 3 3 Horizontal scanning 3 3 4 Vertical scanning 3 4 Power input connection 3 5 Power management 3 6 Display identification 3 6 1 Analog DDC 4 0 Visual characteristics 4 1 Test conditions 4 2 Resolution 4 3 Bright...

Page 42: ...5 4 1 Shipping dimension weight 5 4 2 Block unit palletization 6 0 Environmental characteristics 6 1 Susceptibility of display to external environment 6 2 Transportation tests 6 3 Display disturbances from external environment 6 4 Display disturbances to external environment 6 4 1 EMI 7 0 Reliability 7 1 Mean time between failures 8 0 Quality assurance requirements 8 1 Acceptance test 9 0 Servicea...

Page 43: ...ght CCFL edge light system Active area WXH 337 9 x 270 3mm 17 diagonal Viewing Angle Vertical 120 degree Horizontal 140 degree CR 10 Contrast ratio 450 1 White luminance 250nits Typ QDI Type NR QD17EL07 Number of Pixels 1280 H x1024 V Physical Size 358 5 w 296 5 h 16 5 d mm Pixel Pitch 0 264 per one triad x 0 264 mm Color pixel arrangement RGB vertical stripes Support Color 16 2M colors Display Mo...

Page 44: ...ertical stripes Support Color 16 2M colors Display Mode Normally White Backlight CCFL edge light system Active area WXH 337 92 x 270 336mm 17 diagonal Viewing Angle Vertical 130 degree Horizontal 140 degree CR 10 Contrast ratio 450 1 White luminance 300nits Typ Hannstar Reserved for reference Type NR HSD170ME13 Number of Pixels 1280 H x1024 V Physical Size 358 5 w 296 5 h 15 d mm Pixel Pitch 0 264...

Page 45: ... Functions 1 D Sub analog R G B separate inputs H V sync separated Composite H V TTL level SOG sync 2 9 Ambient temperature 5 C 35 C 2 10 Regulatory compliance Safety B CCIB CCEE China CE Europe CSA Canada DEMKO Nordic EZU Czech FIMKO Nordic Gost Russia IEC 950 CB Report NOM NYCE Mexico PSB Singapore SEMKO Nordic SISIR CPA Singapore TUV Germany UL USA UL2601 1 NAFTA EN60601 EU and IEC60601 1 WW EM...

Page 46: ...gative V sync Positive Negative Composite sync TTL level input impedance 2k2 ohm terminate Positive Negative Sync on green video 0 3V p p Negative Video 0 7 V p p Positive 3 2 Interface 3 2 1 D Sub Cable Length 1 8 M 50 mm fixed Connector type D sub male with DDC 2B pin assignments Blue connector thumb operated jack screws Pin Assignment PIN No SIGNAL 1 Red video input 2 Green video input sync on ...

Page 47: ...ST VIDEO NOISE ADJUST COLOR OSD SETTINGS PRODUCT INFORMATION RESET TO FACTORY SETTINGS EXIT MAIN CONTROLS MOVE SELECTION THEN ok LANGUAGE ENGLISH ESPANOL FRANCAIS DEUTSCH ITALIANO SIMPLE CHINSES ADJUST POSITION HORIZONTAL VERTICAL BRIGHTNESS CONTRAST brightness and contrast adjustment VIDEO NOISE Phase adjustment Clock adjustment ADJUST COLOR Original panel Color 9300K for CAD CAM 6500K for image ...

Page 48: ...8 321 25 175 30 24 f h 31 469kHz 31 468kHz 31 5kHz 35 kHz A us 31 778 800 dots 31 78 900dots 31 778 800 dots 28 571 864 dots B us 3 813 96 dots 3 813 108dots 3 813 96 dots 2 116 64 dots C us 1 907 48 dots 1 907 54dots 1 907 48 dots 3 175 96 dots D us 25 422 640 dots 25 42 720dots 25 422 640 dots 21 164 640 dots E us 0 636 16 dots 0 636 18dots 0 636 16 dots 2 116 64 dots f v 70Hz 70 09 70Hz 70 085 ...

Page 49: ... 678 480 lines 12 8 480 lines 11 093 480 lines 17 066 600 lines S ms 0 45 17 lines 0 026 1 lines 0 023 1 lines 0 029 1 line SYNC H V POLARITY SEP SYNC Y Y Y Y MODE NO 9 10 11 12 RESOLUTION 800 x 600 800 x 600 800 x 600 800 x 600 Dot clock MHz 40 50 49 498 56 251 f h 37 9kHz 48 077kHz 46 9kHz 53 7kHz A us 26 4 1056 dots 20 80 1040dots 21 333 1056 dots 18 631 1048 dots B us 3 2 128 dots 2 400 120 do...

Page 50: ...lines R ms 12 55 624 lines 15 880 768 lines 13 599 768 lines 12 80 768 lines S ms 0 016 1 lines 0 062 3 lines 0 053 3 lines 0 017 1 line SYNC H V POLARITY SEP SYNC Y Y Y Y MODE NO 17 18 19 20 RESOLUTION 1024 x 768 1024 x 768 1152 x 864 1152 x 864 Dot clock MHz 83 096 94 5 79 9 94 5 f h 61 1kHz 68 7kHz 54 0kHz 63 9kHz A us 16 367 1360dots 14 561 1376 dots 18 523 1480 dots 15 661 1480 dots B us 1 34...

Page 51: ...lines 12 678 870 lines 14 552 900lines 12 533 900 lines S ms 0 015 1 lines 0 043 4 line 0 033 2 line 0 028 2 lines SYNC H V Serr POLARITY SEP SYNC Y Y Y Y MODE NO 25 26 27 28 RESOLUTION 1280 x 960 1280 x 960 1280 x 1024 1280 x 1024 Dot clock MHz 108 129 895 108 117 f h 60kHz 75kHz 64kHz 71 7kHz A us 16 667 1800 dots 13 307 1728 dots 15 63 1688 dots 13 949 1632 dots B us 1 037 112 dots 1 047 136 do...

Page 52: ...4 1064 lines 13 329 1066 lines 13 139 1066 lines 20 625 lines P ms 0 02 2 lines 0 038 3 lines 0 099 8 lines 0 128 4 lines Q ms 0 5 38 lines 0 475 38 lines 0 394 32 lines 1 408 44 lines R ms 13 468 1024 lines 12 804 1024 lines 12 622 1024 lines 17 972 556 lines S ms 0 012 0 line 0 012 1 line 0 024 2 lines 0 672 21 lines SYNC H V POLARITY SEP SYNC Y Y Y Y MODE NO 33 34 RESOLUTION 960X720 960X720 Dot...

Page 53: ...K Hz 3 3 4 Vertical scanning Sync polarity Positive or Negative Scanning frequency 56 76 Hz 3 4 Power input connection Power cord length 1 8 M Power cord type 3 leads power cord with protective earth plug 3 5 Power management The power consumption and the status indication of the set with power management function are as follows STATUS H sync V sync Video Power LED On On On Active 40W Green Withou...

Page 54: ...otherwise specified this specification is defined under the following conditions 1 Input signal As defined in 3 3 1280 x 1024 non interlaced mode 80K 75Hz signal sources must have 75 ohm output impedance 2 Luminance setting Contrast 50 brightness 100 3 Warm up more than 30 minutes after power on with signal supplied 4 Ambient light 400 600 lux 5 Ambient temperature 20 5 C 4 2 Resolution Factory pr...

Page 55: ...e picture with OSD warning when input modes are other then 34 preset modes 4 3 Brightness 200 nits at panel color temperature Screen center point Fig 1 4 4 Image size 4 4 1 Actual display size 338x270mm 4 5 Brightness uniformity Set contrast at 50 and turn the brightness to get average above 200 nits at center of the screen Apply the Fig 1 It should comply with the following formula Minimum lumina...

Page 56: ...E Chromaticity color triangle diagram x y coordinate for the screen center should be 9300K CIE coordinates X 0 283 0 020 Y 0 297 0 020 6500K CIE coordinates X 0 313 0 020 Y 0 329 0 020 5 0 Mechanical characteristics 5 1 Controls Front side DC power switch OSD function key UP DOWN Brightness key LEFT RIGHT Auto key Rear Video signal cable Power cord socket 5 2 Unit dimension Weight Detachable Base ...

Page 57: ...letization 6 0 Environmental characteristics The following sections define the interference and susceptibility condition limits that might occur between external environment and the display device 6 1 Susceptibility of display to external environment Operating Temperature 5 to 35 degree C Humidity 80 max Altitude 0 to 12 000 feet Storage Temperature 20 to 60 degree C Humidity 100 max 40 Altitude 0...

Page 58: ...uence 7 Hz 1 05 G 30 min for transport direction only 2 OPERATING Vibration 7 Hz 10 6 G 30 min for transport direction only Test Test Electrical function ok Result Mechanical function ok No serious damage on set appearance For design evaluation only Operating 10 G 11 msec 1000 cycles Bump Temperature 23 C Test Humidity 60 Air pressure 100 kpa According to DSD draft standard UAN D636 B regions of C...

Page 59: ...or design evaluation only Operating 100m s 2 16 msec 1000 pulses Bump Bump frequency 60 80times min Test Source GB9384 97 6 3 Display disturbances from external environment According to IEC 801 2 for ESD disturbances 6 4 Display disturbances to external environment 6 4 1 EMI EMI FCC VCCI CE C Tick MPRIII BCIQ 7 0 Reliability 7 1 Mean Time Between Failures System MTBF Excluding the LCD panel and CC...

Page 60: ... Serviceability 10 0 Philips Flat Panel Monitors Pixel Defect Policy BRIGHT DOT DEFECTS ACCEPTABLE LEVEL MODEL 150C5 170C5 170X5 190X5 1 lit sub pixel 4 or fewer 4 or fewer 0 2 or fewer 2 adjacent lit sub pixels 2 or fewer 2 or fewer 0 1 or fewer 3 adjacent lit sub pixels one white pixel 0 0 0 0 Distance between two bright dot defects 15 mm or more 15 mm or more 0 15 mm or more Total bright dot de...

Page 61: ... 2 adjacent dark sub pixels 2 or fewer 2 or fewer 1 or fewer 2 or fewer 3 adjacent dark sub pixels 0 0 0 0 Distance between two black dot defects 15 mm or more 15 mm or more 15 mm or more 5 mm or more Total black dot defects of all types 4 or fewer 4 or fewer 4 or fewer 4 or fewer TOTAL DOT DEFECTS ACCEPTABLE LEVEL MODEL 150C5 170C5 170X5 190X5 Total bright or black dot defects of all types 5 or f...

Page 62: ... to cover page 17 inch LCD Monitor TYPE 170C5BS 00 BRAND PHILIPS 8639 000 15502 2004 06 08 2004 06 08 590 23 26 Jerry Chen Peter V 62 1 2 3 7 8 W 10 L W L 10 L 2 W 2 4 5 6 9 Position 5 Screen center point ...

Page 63: ...502 2004 06 08 2004 06 08 590 24 26 Jerry Chen Peter V Go to cover page Fig 2 Cross talk pattern Gray level 184 256 Gray level B 1 2 1 6 1 2 A 1 6 Fig 3 Cross talk pattern Center at Gray level 0 Black B 1 6 1 2 1 6 1 3 1 3 1 3 1 3 1 2 A 1 3 ...

Page 64: ...nitor TYPE 170C5BS 00 BRAND PHILIPS 8639 000 15502 2004 06 08 2004 06 08 590 25 26 Jerry Chen Peter V 64 D VIDEO C E SEPARATE SYNC HORIZONTAL B A R VIDEO Q S P O D VIDEO C E B A VERTICAL HORIZONTAL COMPOSITE SYNC FIG 4 TIMING CHART 1 ...

Page 65: ...AND PHILIPS 8639 000 15502 2004 06 08 2004 06 08 590 26 26 Jerry Chen Peter V Go to cover page D VIDEO C E B A VERTICAL COMPOSITE SYNC FIG 5 TIMING CHART 2 O P Q R S VIDEO B S P Q O R SYNC ON GREEN HORIZONTAL VERTICAL ...

Page 66: ...r technicians review test procedures so that HV and HV regulation are always checked as a standard servicing procedure and the reason for this prudent routine is clearly understood by everyone It is important to use an accurate and reliable HV meter It is recommended that the HV recorded on each customer s invoice which will demonstrate a proper concern for the customer s safety 5 When troubleshoo...

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