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| no.51881 av28bt5ens / av28bt5enb av28bt5ees / av28bt5eeb 1 copyright ? 2001 victor company of japan, ltd. dec. 2001 av28bt5ens / av28bt5enb av28bt5ees / av28bt5eeb contents ? specifications ???????????????????????????????? ???????????????????????????????? ???????????????????????????????? ????????????????????????????????????????????????????????????? ????????????????????????????? ????????????????????????????? ????????????????????????????? 2 ? safety precautions ???????????????????????????????? ???????????????????????????????? ???????????????????????????????? ??????????????????????????????????????????????????????? ??????????????????????? ??????????????????????? ??????????????????????? 4 ? features ???????????????????????????????? ???????????????????????????????? ???????????????????????????????? ??????????????????????????????????????????????????????????????? ? ???????????????????????????????? ???????????????????????????????? ??????????????????????????????????? ??? ??? ??? 5 ? main difference parts list ???????????????????????????????? ???????????????????????????????? ???????????????????????????????? ????????????????????????????????????????????????? ????????????????? ????????????????? ????????????????? 5 ? specific service instructions ???????????????????????????????? ???????????????????????????????? ???????????????????????????????? ????????????????????????????????????????????? ????????????? ????????????? ????????????? 6 ? service adjustments ???????????????????????????????? ???????????????????????????????? ???????????????????????????????? ?????????????????????????????????????????????????????? ?????????????????????? ?????????????????????? ?????????????????????? 9 ? parts list ???????????????????????????????? ???????????????????????????????? ???????????????????????????????? ??????????????????????????????????????????????????????????????? ? ???????????????????????????????? ???????????????????????????????? ????????????????????????????????? ? ? ? 17 operating instructions standard circuit diagram ???????????????????????????????? ???????????????????????????????? ???????????????????????????????? ???????????????????????????????????????????????? ???????????????? ???????????????? ???????????????? 2-1 service manual colour television ( datasheet : )
no.51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 2 specifications content item av28bt5ens (silver) av28bt5enb (black) av28bt5ees (silver) av28bt5eeb (black) dimensions (wxhxd) 69 x 54 x 47 cm weight 34.6 kg tv rf system b/g b/g, d/k, k1 tv mode pal pal / secam colour system video mode pal / ntsc 3.58 / ntsc 4.43 pal / secam / ntsc 3.58 / ntsc 4.43 teletext system fastext / toptext stereo system a2 / german + nicam tuning system frequency synthesizer tuning system number of ch memory position 100 ch vhf (vl) 46.25mhz ~ 168.25mhz vhf (vh) 175.25mhz ~ 463.25mhz uhf 471.25mhz ~ 863.25mhz receiving frequency catv super (s11-s20) & hyper (s21-s41) bands receivable vif carrier 38.9mhz 32.4mhz (6.5mhz) 32.9mhz (6.0mhz) intermediate frequency sif carrier 33.4mhz (5.5mhz) colour sub carrier frequency pal (4.43mhz), secam (4.43mhz), ntsc (3.58mhz/4.43mhz) aerial input terminal 75ohm unbalanced power input ac 170 ~ 270v power consumption 126w(max.)/103w(avg.) stand-by<5w picture tube 28 inch measured diagonally high voltage 28kv (in cut-off service mode) speaker 101 mm round type x 2 audio output 8w + 8w video 1vp-p, 75 ohm s/video y: 1vp-p positive c: 0.286vp-p input audio (l/r) 500 mvrms, high impedance video 1 vp-p, 75 ohm output audio (l/r) 500 mvrms, low impedance av1 (video/audio/rgb) rear side av2 (video/audio/s-vhs) input terminal front side av3 (video/audio) front side headphone jack (stereo mini jack 3.5 ? ) av1 (video/audio) output terminal rear side av2 (video/audio) (selected tv, av1 or av3) remote control unit rm-c85, battery size:aaa/r03 x 2 design & specifications are subject to change without notice. no.51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 3 21-pin euro connector (scart socket) : av-1 / av-2 (p-p= peak to peak, s-w= sync tip to white peak, b-w= blanking to white peak) pin no. signal designation matching value av-1 av-2 1 audio r output 500mvrms(nominal),low impedance (tv out) (tv/line out) 2 audio r input 500mvrms(nominal),high impedance 3 audio l output 500mvrms(nominal),low impedance (tv out) (tv/line out) 4 audio gnd 5 gnd (b) 6 audio l input 500mvrms(nominal), high impedance 7b input 700mv b-w , 75 ? nc 8 functon sw (slow sw) low : 0-3v, high : 8-12v, high impedance nc 9 gnd (g) 10 - nc - 11 g input 700mv b-w , 75 ? nc 12 - nc - 13 gnd (r) 14 gnd (ys) nc 15 r / c input r : 700mv b-w , 75 c : 300mv p-p , 75 (r/c) (only c) 16 ys input low : 0 ? 0.4, high : 1 - 3v, 75 ? nc 17 gnd(video output) 18 gnd(video input) 19 video output 1v s-w (negative going sync), 75 (tv) (tv/line out) 20 video / y input 1v s-w (negative going sync), 75 ? 21 common gnd [ pin assignment ] no.51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 4 safety precautions 1. the design of this product contains special hardware many circuits and components specially for safety purposes. for continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. replacement parts must be identical to those used in the original circuits. service should be performed by qualified personnel only. 2. alterations of the design or circuitry of the product should not be made. any design alterations or additions will void the manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom. 3. many electrical and mechanical parts in the products have special safety-related characteristics. these characteristics are often not evident from visual inspection nor can the protection afforded by them necessary be obtained by using replacement components rated for higher voltage, wattage, etc. replacement parts which have these special safety characteristics are identified in the parts list of service manual. electrical components having such features are identified by shading on the schematics and by ( ) on the parts list in the service manual. the use of a substitute replacement which does not have the same safety characteristics as the recommended replacement part shown in the parts list of service manual may cause shock, fire, or other hazards. 4. don?t short between the live side ground and isolated (neutral) side ground or earth side ground when repairing. some models power circuit is partly different in the gnd. the difference of the gnd is shown by the live : ( ) side gnd, the isolated(neutral) : ( ) side gnd and earth : ( ) side gnd. don?t short between the live side gnd and isolated (neutral) side gnd or earth side gnd and never measnure with a measuring apparatus (oscilloscope etc.) the live side gnd and isolated(neutral) side gnd or earth side gnd at the same time. if above note willl not be kept, a fuse or any parts will be broken. 5. if any repair has been made to the chassis, it is recommended that the b1 setting should be checked or adjusted (see adjustment of b1 power supply). 6. the high voltage applied to the picture tube must conform with that specified in srevice manual. excessive high voltage can cause an increase in x-ray emission, arcing and possible component damage, therefore operation under excessive high voltage conditions should be kept to minimum, or should be preveted. if severe arcing occurs, remove the ac power immediately and determine the cause by visual inspecton (incorrect installation, cracked or melted high voltage harness, poor soldering, etc.). to maintain the proper minimum level of soft x-ray emission, components in the high voltage circuitry including the picture tube must be the exact replacements or alternatives approved by the manufacturer of the complete product. 7. do not check high voltage by drawing an arc. use a high voltage meter or a high voltage probe with a vtvm. discharge the picture tube before attempting meter connection, by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10k 2w resistor to the anode button. 8. when service is required, observe the original lead dress. extra precaution should be given to assure correct lead dress in the hig voltage circuit area. where a short curcuit has occurred, those components that indicate evidence of overheating should be replaced. always use the manufacturer?s replacement components. 9. isolation check (safety for electrical shock hazard) after re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna terminals, videl/audio input and output terminals, control knobs, metal cabinet, screwheads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock. (1) dielectric strength test the isolation between the ac primary circuit and all metal parts exposed to the user, particularly any exposed metal part having a return path to the chassis should withstand a voltage of 3000v ac(r.m.s.) for a period of one second. ( . . .withstand a voltage of 1100v ac (r.m.s.) to an appliance rated up to 120v, and 3000v ac (r.m.s.) to an appliance rated 200v or more, for a period of one second.) this method of test requires a test equipment not generally found in the service trade. (2) leakage current check plug the ac line cord directly into the ac outlet (do not use a line isolation transformer during this check.). using a ?leakage current tester?, measure the leakage current from each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the chassis, to a knowm good earth ground (water pipe, etc.). any leakege current must not exceed 0.5ma ac(r.m.s.). alternate check method plug the ac line cord directly into the ac outlet (do not use a line isolation transformer during this check.). use an ac voltmeter having 1000 ohms per volt or more sensitivity in the following manner. connect a 1500 10w resistor paralleled by a 0.15 f ac-type capacitor between an exposed metal part and a known good earth ground (water pipe, etc.). measure the ac voltage across the resistor with the ac voltmeter. move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the ac voltage across the resistor. now, reverse the plug in the ac outlet and repeat earch measurement. any voltage measured must mot exceed 0.35v ac (r.m.s.). this corresponds to 0.5ma ac (r.m.s.). no.51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 5 features 1. it is a remte controlled color television. 2. 100 programs from vhf, uhf bands or cable channels can be preset. 3. it can tune cable channels. 4. controlling the tv is very easy by its menu driven system. 5. it has two euroconnector sockets for external device (such as video recorder, video games, audio set, etc.) 6. front av input available. 7. stereo sound systems (german + nicam) are available. 8. full function teletext (fastext, toptext). 9. it is possible to connect headphone. 10. direct channel access. 11. aps (automatic programming system). 12. all programs can be named. 13. forward or backward automatic tuning. 14. automatic sound mute when no transmission. 15. 5 minutes after the broadcasting (closedown), the tv switches itself automatically to stand-by mode. main difference list model no. parts name av28bt5ens (silver) av28bt5enb (black) av28bt5ees (silver) av28bt5eeb (black) main pwb ve-20073586 ve-20073447 f carton box ve-20074229 ve-20073917 ve-20074101 ve-20074115 inst book ve-50021021 ve-50021020 rating label ve-20074227 ve-20073915 ve-20074100 ve-20074113 front cabinet ve-20073707 ve-20003525 ve-20073707 ve-20003525 back cover ve-20004635 ve-20016402 ve-20004635 ve-20016402 no.51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 6 specific service instructions disassembly procedure removing the rear cover 1. remove the 8 screws marked a . 2. withdraw the rear cover toward you. removing the headphone jack board ass?y z after removing the rear cover. 1. remove the 1 screw marked b . 2. after pulling jack board back, it shifts rightward. removing the speaker z after removing the rear cover. 1. remove the 2 screws marked c , and remove the speaker bkt ass?y. 2. remove the 4 screws marked d , and remove the speaker bkt cover. 3. remove the 4 screws marked e , and remove the speaker. removing the main pwb & procedure to development z after removing the rear cover. 1. remove the jack board ass?y. 2. remove the left speaker bkt ass?y. 3. remove the power supply transformer. 4. remove the 2 screws marked f atached to the main pwb ass?y. cautions) be careful enough when developing a main chassis. the wire of a power transfer does not separate and short-circuit with other parts. removing the front control pwb z after removing the rear cover. 1. remove the main pwb ass?y. 2. remove the 6 screws marked g , and remove the front control pwb. removing the power sw z after removing the rear cover. 1. remove the main pwb ass?y. 2. remove the 2 screws marked h , and remove the power sw. a rear cover b headphone jack c speaker bkt d speaker bkt speaker e f g front control pwb h power sw (8) (2) (4) (4) (6) (2) (2) no.51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 7 setting of the last memory for shipment user setting values setting item setting value setting item setting value sound menu feature menu bass center sleep timer off treble child lock off balance effect off picture menu install-> tv config. menu brightness language english colour country ? contrast av-2 output tv sharpness hue (only ntsc) these adjust are automatically restored when aps bit in service menu is set. the procedure for selling aps bit is discribed bellow. picture mode auto setting aps bit in service menu 1) enter service menu in tv mode by pressing ?info? and ?muting? keys simultaneously. service menu will appear. 2) select options by pressing up/down keys on remote control unit. 3) enter options by pressing left/right keys on remote control unit. 4) select option 8 by pressing up/down keys on remote control unit. 5) selected bit in one option is shown by blinking character. select b2 by pressing left/right keys on remote control unit. do not change any other bit. 6) press digit key ?1? to set aps bit. 7) press ?standard? key on remote control unit to exit service mode. no. 51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 8 replacement of chip component ? cautions 1. avoid heating for more than 3 seconds. 2. do not rub the electrodes and the resist parts of the pattern. 3. when removing a chip part, melt the solder adequately. 4. do not reuse a chip part after removing it. ? soldering iron 1. use a high insulation soldering iron with a thin pointed end of it. 2. a 30w soldering iron is recommended for easily removing parts. ? replacement steps 1. how to remove chip parts ? resistors, capacitors, etc. (1) as shown in the figure, push the part with tweezers and alternately melt the solder at each end. (2) shift with tweezers and remove the chip part. ? transistors, diodes, variable resistors, etc. (1) apply extra solder to each lead. (2) as shown in the figure, push the part with tweezers and alternately melt the solder at each lead. shift and remove the chip part. note : after removing the part, remove remaining solder from the pattern. 2. how to install chip parts ? resistors, capacitors, etc. (1) apply solder to the pattern as indicated in the figure. (2) grasp the chip part with tweezers and place it on the solder. then heat and melt the solder at both ends of the chip part. ? transistors, diodes, variable resistors, etc. (1) apply solder to the pattern as indicated in the figure. (2) grasp the chip part with tweezers and place it on the solder. (3) first solder lead a as indicated in the figure. (4) then solder leads b and c . solder solder a b c a b c no. 51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 9 service adjustments adjustment preparation: 1. you can make the necessary adjustments for this unit with either the remote control unit or with the adjustment tools and parts as given below. 2. adjustment with the remote control unit is made on the basis of the initial setting values, however, the new setting values which set the screen to its optimum condition may differ from the initial settings. 3. make sure that ac power is turned on correctly. 4. turn on the power for set and test equipment before use, and start the adjustment procedures after waiting at least 30 minutes. 5. unless otherwise specified, prepare the most suitable reception or input signal for adjustment. 6. never touch any adjustment parts which are not specified in the list for this adjustment - variable resistors, transformers, condensers, etc. 7. presetting before adjustment. unless otherwise specified in the adjustment instructions, preset the following functions with the remote control unit: video status standard tint/color picture/bright detail center adjustment equipment 1. dc voltmeter (or digital voltmeter) 2. signal generator (pattern generator) pal/secam/ntsc 3. remote control unit main parts locations vol prog /ch. menu led remocon receiver ic501 micom ic502 memory ic tuner scart-1 scart-2 multi sound pwb fbt upper : focus vr lower : screen vr b1 (indicated [150/115v] on the bottom side) video r l front top audio. no. 51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 10 basic operation service menu how to enter the service mode 1) press the information key and muting key of remote control unit, simultaneously. selection of adjustment items 1) press the up ( ) or down ( ) key and select the adjustment item. 2) press the right ( ) or left ( ) key and enter adjustment screen. 3) to change the selected parameter, use right ( ) and left ( ) key. how to exit service mode 1) press the standard key on remote control unit. adjustment service menu adjustment item adjust no. discription 00 white point red 01 white point green white balance 02 white point blue agc 03 agc if-pll negative 04 if-pll negative if-pll positive 05 if-pll positive 06 y-delay pal 07 y-delay secam luminance delay 08 y-delay ntsc 10 4 : 3 picture mode vertical zoom 21 16 : 9 picture mode 11 4 : 3 picture mode vertical scroll 22 16 : 9 picture mode 12 4 : 3 picture mode 4 : 3 horizontal shift 23 16 : 9 picture mode 13 4 : 3 picture mode vertical slope 24 16 : 9 picture mode 14 4 : 3 picture mode vertical amplitud 25 16 : 9 picture mode 15 4 : 3 picture mode s-correction 26 16 : 9 picture mode 16 4 : 3 picture mode vertical shift 27 16 : 9 picture mode 17 4 : 3 picture mode ew width 28 16 : 9 picture mode 18 4 : 3 picture mode ew parabola width 29 16 : 9 picture mode 19 4 : 3 picture mode ew corner parabola 30 16 : 9 picture mode 20 4 : 3 picture mode ew trapezium 31 16 : 9 picture mode service a djust?.. options?.. service menu screen adjust *** *** *** out up adjustment screen standard key up / down key right / left key remote control unit key name muting key information key no. 51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 11 adjustments item measuring instrument test point adjustment part description screen voltage adjustment signal generator remote control unit screen vr [fbt] option 02 1. receive a pal colour bar. 2. enter the option settings in the service menu. 3. press the function / key, and enter option 02 . 4. to change bit 6, come on to it by using function / and make it ?1? by pressing ?1? white bit 2 is blinking. 5. observe the thin horizontal blue-white line in the middle of the screen, and adjust the lower vr of the fbt, until the line is in its thinnest visible thickness. 6. then make option 02 bit 6 ?0? , by pressing ?0? on the remote control unit, although you do not see any picture. focus adjustment signal generator focus vr [fbt] 1. receive a pal circle pattern. 2. adjust the upper vr of the fbt, until you get the optinum focus, the sharpest picture. b1 voltage check dc voltmeter marked [150/115v] on the main pwb 1. check whether the voltage at the point named and silk screened as ?150 / 115v? on the main pwb is 150v dc. no. 51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 12 item measuring instruments test point adjustment part description white balance signal generator adjust 00 (white point - red) adjust 01 (white point - green) adjust 02 (white point - blue) [low light] 1. receive a whole black signal. 2. adjust the no. 51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 13 item measuring instruments test point adjustment part description adjust 06 [ y-delay pal ] 1. receive a pal colour bar signal. 2. select no. 51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 14 item measuring instruments test point adjustment part description vertical zoom adjustment signal generator adjust 10 ( 4 : 3 ) adjust 21 ( 16 : 9 ) 1. receive a pal circle test pattern. 2. set < 4 : 3 aspect mode > . 3. select < adjust 10 > from service menu. 4. change vertical zoom till you see the upper and olwer limit of the circle as close to the upper and lower limit of the picture tube as possible. 5. set < 16 : 9 aspect mode > . 6. adjusts with the step which is the same above from 3 to 4 about the 16 : 9 aspect mode, too. vertical scroll adjustment signal generator adjust 11 ( 4 : 3 ) adjust 22 ( 16 : 9 ) 1. receive a pal circle test pattern. 2. set < 4 : 3 aspect mode > . 3. select < adjust 11 > from service menu. 4. change vertical scroll till you see the circle exactly un the middle of the screen. 5. set < 16 : 9 aspect mode > . 6. adjusts with the step which is the same above from 3 to 4 about the 16 : 9 aspect mode, too. 4 : 3 horizontal shift adjustment signal generator adjust 12 ( 4 : 3 ) adjust 23 ( 16 : 9 ) 1. receive a red purity test pattern. 2. set < 4 : 3 aspect mode > . 3. select < adjust 12 > from service menu. 4. change horizontal shift till the picture is horizontally centered. check whether this adjustment is correct after completing service mode adjustment. 5. set < 16 : 9 aspect mode > . 6. adjusts with the step which is the same above from 3 to 4 about the 16 : 9 aspect mode, too. vertical slope adjustment signal generator adjust 13 ( 4 : 3 ) adjust 24 ( 16 : 9 ) 1. receive a cross-hatch signal. 2. set < 4 : 3 aspect mode > . 3. select < adjust 13 > from service menu. 4. change vertical slope till the size of squares on both the upper and lower part of test pattern become equal to the squares laying on the vertical centre of the test pattern. 5. check and readjust vertical slope item if the adjustment becomes improper after some other geometric adjustments are done. 6. set < 16 : 9 aspect mode > . 7. adjusts with the step which is the same above from 3 to 5 about the 16 : 9 aspect mode, too. vertical am plitude adjustment signal generator adjust 14 ( 4 : 3 ) adjust 25 ( 16 : 9 ) 1. receive a pal test pattern signal. 2. set < 4 : 3 aspect mode > . 3. select < adjust 14 > from service menu. 4. change vertical slope till horizontal black lines on both the upper and lower part of the test pattern become very close to the upper and lower horizontal sides of picture tube and nearly about to disappear. 5. check and readjust vertical amplitude item if the adjustment becomes improper after some other geometric adjustments are done. 6. set < 16 : 9 aspect mode > . 7. adjusts with the step which is the same above from 3 to 5 about the 16 : 9 aspect mode, too. no. 51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 15 item measuring instrument test point adjustment part description s-correction adjustment signal generator adjust 15 ( 4 : 3 ) adjust 26 ( 16 : 9 ) 1. receive a pal circle pattern signal. 2. set < 4 : 3 aspect mode > . 3. select < adjust 15 > from service menu. 4. change s-correction till the middle part of the circle is round as possible. 5. set < 16 : 9 aspect mode > . 6. adjusts with the step which is the same above from 3 to 4 about the 16 : 9 aspect mode, too. vertical shift adjustment signal generator adjust 16 ( 4 : 3 ) adjust 27 ( 16 : 9 ) 1. receive a pal test pattern signal ( or the symmetrical signal in the top and the bottom and on either side to find ). 2. set < 4 : 3 aspect mode > . 3. select < adjust 16 > from service menu. 4. change vertical shift till the test pattern is vertically centred, i.e. horizontal line at the centre pattern is in equal distance both to upper and lower side of the picture tube. 5. check and readjust vertical shift item if the adjustment becomes improper after some other geometric adjustments are done. 6. set < 16 : 9 aspect mode > . 7. adjusts with the step which is the same above from 3 to 5 about the 16 : 9 aspect mode, too. ew width adjustment signal generator adjust 17 ( 4 : 3 ) adjust 28 ( 16 : 9 ) 1. receive a pal test pattern signal. 2. set < 4 : 3 aspect mode > . 3. select < adjust 17 > from service menu. 4. change ew width till the vertical black and white bars on both left and right side of the pattern exactly disappear. 5. set < 16 : 9 aspect mode > . 6. adjusts with the step which is the same above from 3 to 4 about the 16 : 9 aspect mode, too. ew parabola width adjustment signal generator adjust 18 ( 4 : 3 ) adjust 29 ( 16 : 9 ) 1. receive a pal test pattern signal. 2. set < 4 : 3 aspect mode > . 3. select < adjust 18 > from service menu. 4. change ew parabola width till vertical lines close to the both sides of the picture frame become parallel to vertical side of picture tube. 5. check and readjust ew parabola width item if the adjustment becomes improper after some other geometric adjustments are done. 6. set < 16 : 9 aspect mode > . 7. adjusts with the step which is the same above from 3 to 5 about the 16 : 9 aspect mode, too. ew corner parabola adjustment signal generator adjust 19 ( 4 : 3 ) adjust 30 ( 16 : 9 ) 1. receive a pal test pattern signal. 2. set < 4 : 3 aspect mode > . 3. select < adjust 19 > from service menu. 4. change ew corner parabola till vertical lines at the corners of both sides of picture frame become vertical and parallel to vertical corner sides of picture tube. 5. check and readjust ew corner parabola item if the adjustment becomes improper after some other geometric adjustments are done. 6. set < 16 : 9 aspect mode > . 7. adjusts with the step which is the same above from 3 to 5 about the 16 : 9 aspect mode, too. no. 51881 a v28bt5ens / av28bt5enb a v28bt5ees / av28bt5eeb 16 item measuring instrument test point adjustment part description ew trapezium adjustment signal generator adjust 20 ( 4 : 3 ) adjust 31 ( 16 : 9 ) 1. receive a pal circle pattern signal. 2. set < 4 : 3 aspect mode > . 3. select < adjust 15 > from service menu. 4. change ew trapezium till vertical lines, especially lines at the sides of the picture frame became parallel to the both sides of picture tube as possible. 5. check and readjust ew trapezium item if the adjustment becomes improper after some other geometric adjustment. 6. set < 16 : 9 aspect mode > . 7. adjusts with the step which is the same above from 3 to 5 about the 16 : 9 aspect mode, too. 4 vp 0112 dp205180 victor company of japan, limited home av network business unit 12, 3-chome, moriya-cho, kanagawa-ku, yokohama, kanagawa-prefecture, 221-8528, japan |
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