S E R V I C E M A N U A L
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1. 1601 T E E ge cana Y 25018188 1 we Load E 012136 n IC801 f se 92 Bo Yo m 10 m at j aa Yu EE aiiz joe rd ri E PNG e T4 I Q xe op s E em zx E Eu Dum w Y IC601 w s 0 TDA9102B IC301 lan P TDA8172 010 mm wl v 1 uvermina 1801 220K wie ka R920 w AN4148 yu 314 gt F m 22001 y TEE ua em IL M RA T mes ver br cate 22000 gt ge m gt caos v Kg oe LN DUE E m mus mb R922 b PET 5 K KN seul BB ey m ior E ER P F2. KRISTEL 100 100 1428 30 pg 7 1428 30k series SCHEMATIC DIAGRAM CRT BOARD model 200 200 1564 USED IN CONJUNCTION WITH 1428 30k pcb REARING EEE cone m 1888 ei px dq gt gt gt ta 2291 su 0000900096 za EI gt pem 7 udo T 228 1258 sh 0218 FERHITE gis 3528 itty 5 0000 hus S182 3 2338 To B801 main PCB atazen TO B503 main PCB NOTES B211 to B901 main PCB ALL NOTE GND CAPACITORS CL i e TV GND 12v 1 RESISTOR VALUES ARE IN OHMS K 1 8 M 1 9 K 2 ALL RESISTORS ARE 1 8WATT EXPECT WHERE OTHERWISE 3 CAPACITOR VALUES ARE IN uf UNLESS OTHERWISE INDICATED P PF ARE S VOLTS EXCEPT WHERE OTHERWISE INDICATEC All marked area with red square is subject to be changed accordingly with the model of the CRT and the characteristics of the deflection yoke existing on the CRT Actual
3. 100 5629 gt 1 P pon m 1274 MV 700 1528 T B pos nn one ale mh 3 AGT 8920 1 i Ld 100 8 91005 adt mrs My gota OL Ano JAWO 49 xicont i i Y 4em5 8 f Woa dvoamem al ri d ura T T 5 LE n y 7 avsa Wee MCE LLL JAjg uv BOY aut lt m LT 2 lt m dn GOTH NOSIA E 1428 30k series GREEN Horizontal Output Section YELLOW HV Section FBT CORAL Electronic Width Control PURPLE Power Supply Section RED Sync Processing Section BLUE Vertical Section 3 1501 OD 6512 8516 R 14 C513 WH g 0503 214 VRSIO JF RSI3 ANA cs41 0501 VR301 PINCUSHION 4 C901 70
4. BILL OF MATERIAL CRT BOARD EAST Ei 850 11 1735 April 09 1997 Partt No Description Quantity Location 200 200 1564 CRT BOARD 1 210 122 0856 RES 1 2K1 8W J 1 R213 210 182 0856 RES 1 8K1 8W J 1 R211 210 102 0256 RES 1K1 2W J TAP 1 R252 210 102 0856 RES IK1 8W J TAP 2 R207 R273 210 105 0456 RES 1M1 4W J TAP 3 R241 R245 R249 210 472 0856 RES 4 7K1 8W J 2 R208 R282 210 562 0456 RES 5 6K1 4W J TAP 3 R232 R235 R238 210 822 0856 RES 8 2K1 8W J TAP 1 R212 210 103 0256 X RES 10K1 2W J 1 R253 210 103 0856 RES 10K1 8W J TAP 3 R204 R205 R206 210 303 0456 RES 30K1 4W J TAP 3 R240 R244 R248 210 330 0856 RES 33HI 8W J TAP 3 R217 R222 R228 210 470 0456 RES 47H1 4W J TAP 3 R231 R234 R237 210 470 0856 RES 47H1 8W J TAP 2 R223 R224 210 101 0256 RES 100H1 2W J 1 R229 210 101 0856 RES 100H1 8W J TAP l R220 210 221 0256 RES 220H1 2W J TAP 3 R242 R246 R250 210 391 0456 RES 390H1 4W 3 3 R239 R243 R247 210 391 0856 RES 390H1 8W J TAP 8 R214 R215 R218 R219 R225 R226 R271 R272 210 750 0856 RES 75H1 8W J TAP 3 R201 R202 R203 210 560 0856 RES 56H1 8W J 3 R216 R221 R227 520 001 4148 DIODT 1N4148 7 19201 0202 0203 0214 10215 0216 0217 521 005 0942 ZENER DIODE 9A2 TAP 1 ZD201 745 4R7 1062 PEAKING 4 7UH TAP 3 L203 L204 L205 745 561 1062 PEAKING 560UH 2 L201 L202 622 106 0501 JUMPER 0 6D 5MM 3 2211 7212 1224 622 106 9101 JUMPER 0 6D 7 5MM 12 12
5. J201 J214 C211 C212 C214 C215 C204 C205 C206 C250 C225 C227 C228 C231 C233 C235 C221 C222 C223 C232 C234 C236 C201 C202 C203 C207 C224 C226 C229 C213 C216 C217 C218 C239 C240 C241 Q219 Q206 Q209 Q212 Q207 Q210 Q213 Q202 Q203 Q204 251 R230 R233 R236 C238 C237 C230 12201 VR204 VR205 VR206 VR202 VR203 G201 8G202 8G203 8207 B206 B503 B203 B201 7V 12V B GND FOR 211 FOR B202 SG201 SG202 SG203 pg 28 1428 30k series 3 820 001 2682 TR ASS Y KSC2682 TR ASS Y KSC2682 820 001 2682 510 200 2682 TR KSC2682 23C1609 51 120 001 1428 HEAT SINK 10 15mm 3 104 006 3032 SCREW R W3 6mm ISO 3 Q205 Q208 Q211 Q205 Q208 Q211 pg 29 1428 30k series 4 MAIN BOARD E KEI8B 850 00N 1735 Part No Description 200 100 428K MAIN BOARD 210 122 0456 RES 1 2K1 4W J TAP 210 152 0256 RES 1 5K1 2W J 210 152 0456 RES 1 5K1 4W J TAP 210 182 0456 RES 1 8K1 4W J 210 1R5 0256 RES 1 5H1 2W J TAP 210 102 0456 RES 1K1 4W J TAP 210 105 0456 RES 1M1 4W J TAP 210 222 0456 RES 2 2K1 4W J 210 272 0456 RES 2 7K1 4W J TAP 210 202 0456 RES 2K1 4W J 210 332 0456 RES 3 3K1 4W J 210 392 0456 RES 3 9K1 4W J TAP 210 472 0456 RES 4 7K1 4W J TAP 210 472 0856 RES 4 7K1 8W J 210 562 0456 RES 5 6K1 4W J 210 682 0456 RES 6 8K1 4W J 210 822 0456 RES 8 2K1 4W J TAP 210 822 0856 RES 8 2K1 8W J TAP 210 103 0456 RES 10K1 4W J 210 123 0456 RES 1
6. CRT socket Blanking from A ___ amp H sync B902 main PCB B901 2 main PCB a heater 3 from B503 main PCB gt _ k B from 503 main PCB DAG spring conn 12vDC from 503 main ABL and GND connect to 901 main PCB GND2 to 503 main CRT BOARD 1 1 200 200 1564 1428 30k series AB VIDEO PCB ABNO2CX autobias INFORMATION amp PRINCIPAL SECTIONS AREA PROCESSOR c 59 ee hx T K lt e C 32 z j e PG 7 socket large small neck yellow wire G1DRV NOTE small neck ABN02CX blue wire HR red wire GND5 ground yellow wire Vsync GNDI1 dag spring connect G2 pin connector white wire 12vDC P201 LOGIC CONNECTOR CRT BOARD 02 pg 6 a 1428 30k series AUTO BIAS AUTOMATIC BIASING VIDEO SYSTEM PURPOSE The purpose of the system 1 to establish and maintain a constant and correct black level cutoff level on the CRT screen without the need for manually adjusting the biasing of the individual video amplifiers This has the advantage of greatly simplifying the initial setup plus maintaining the biasing conditions throughout the life of the CRT as it ages It also eliminates the need for individual red gree
7. 12 6 POLE CONVERGENCE MAGNET R G 122 LEAD WIRE LENGTH 52 RUBBER WEDGE 1329 PLUG 6 CANCELLATION COIL lt MPRI TYPE 14 gt NECK 72 DEFLECTION YOKE 15 BASE 582 amp 17 TERMINAL BOARD 16 PIN pg 15 1428 30k series ELECTRICAL DATA AND RATINGS CHUNGHWA 147 1 MAXIMUM AND MINIMUM RATINGS Design maximum values Unless otherwise specified voltage values are for each gun and are positive with respect to Grid No 1 Anode voltage 27 5 Min 20 0 Total anode current long term average 450 u Grid No 3 focusing eletrode voltage 10 Grid 2 peak voltage including video signal voltage cies e rra ss Max 1 000 Y Cathode voltage Positive bias value Max 400 Y Positive operating cutoff value Max 200 Y Negative bias value Max 0 Y Negative peak value Max 2 Y Heater voltage AC or DC Under operating conditions 6 3 Y Heater current 600 mA 10 Peak heater cathode voltage Heater negative respect to cathode During equipment warm up period not exceeding 15 seconds Max 350 Y After equipment warm up period Max 200 Y Heater positive with respect to cathode i vod diae sagan max 200 Y DC max 0 V NOTE a Absolute maximum rating system b For optimum emission stability
8. 510 070 0122 TR TIP122 1 0306 120 001 122 HEAT SINK 15 23 60 1 104 006 3032 SCREW R W3 6mm ISO 1 VR ASS Y 830 002 1735 200 700 1428K VR PCB 1 234 103 0877 VR B 10K 8mm 3 VR201 VR309 VR604 234 502 0877 VR B 5K 8mm 2 VR302 VR307 234 104 0877 VR B 100K 8mm 1 VR902 631 017 1735 CONNECTOR 17 18P 1 POWER BOARD ASS Y 850 002 1735 5 3C 200 300 1428K POWER PCB 1 210 154 0456 RES 150K1 4W J 2 R331 R332 210 223 0456 RES 22K1 4W J 2 R333 R334 210 332 0456 RES 3 3K1 4W J 2 R337 R338 210 433 0456 RES 43K1 4W J 1 R335 POWER BOARD ASS Y 850 22T 17357 55 318 104 6350 MEF 0 1UF 63V J 1 C338 300 100 2520 EC 10UF 25V 85C 2 331 332 300 R47 5020 0 470 50 85 TAP 1 C330 POWER BOARD AS S Y 851 002 1735 Hit 233 103 0677 VR B 10K 6mm RA 1 VR301 233 102 0677 VR B IK 6mm E s 1 VR304 504 200 3080 IC CA3080E H9627 1 12302 630 009 4001 WAFTER 9P2 54 ifj P301 pg 36 z DOUBLE CIECUIT TITT USET
9. C524 C526 pg 33 1428 30k series 8 300 102 1622 300 222 1622 316 4R7 5072 523 030 6001 522 020 H306 522 020 H307 522 020 H308 510 010 0988 233 302 0677 233 502 0677 233 103 0677 233 104 0677 234 202 0877 745 180 2063 745 181 2063 740 9R9 3083 750 255 1415 730 202 1448 730 102 1735 531 358 1436 730 302 1436 120 002 1436 100 008 3032 104 008 4012 550 141 3000 551 021 0001 524 002 0201 504 800 9102 504 200 3842 504 150 4N35 503 100 8041 630 001 2001 630 002 2002 630 002 5002 630 003 4001 630 004 4001 630 006 4001 630 004 3001 630 006 2001 EC 1000UF 16V 85C 1 EC 2200UF 16V 85C 1 4 70 50 1 BRIDGE DIODE KBL06 4 1 DIODE HER306 1 DIODE HER307 34 800 2 DIODE HER308 2 TR 2SB988Y 1 VR B 3K 6mm 1 VR B 5K 6mm 2 VR B 10K 6mm 1 VR B 100K 6mm EA 1 VR B 2K 8mm 1 18UH 3 180UH 14 17 1 H LINEARITY 9 9UH 1 LINE FILTER 25MH EI 28 1 TRANSFORMER H DRIVER 1 TRANSFORMER 2140 1 RESONATOR 3 58MHZ FBT KAS FBT SCREW R3 8mm ISO SCREW T4 8mm 1 FUSE 3A 250V 20mm FUSE CLIP 20mm LED GREEN 3mm 2PIN IC TDA9102C IC KA3842B IC TAN35 TOSHIBA IC WT8041 BASE 1 56D P 6X9 BASE 1 56D 2P 6X9 WAFER 3 96 3P fi 1P BASE XH180 BASE XH180 4P BASE XH180 6P BASE 2 36D 4P DY BASE 1 56D 6P 6X9 DY m n MO c n xn o ON om C307 C316 C334 BD501 D610 D602 D609 D506 D507 Q503 VR310 VR501 VR6
10. LET TERI Her TE KS DI corporation 555 S Kirk Road St Charles 60174 630 443 1290 630 443 1390 SERVICE MANUAL Color Monitors 1428 30K Series Produced by MM Copyright 1997 COLOR DATA DISPLAY by KRISTEL ISO 9001 CERTIFIED 1428 30K series COLOR SPECIFICATIONS CRT From 10 to 28 diagonal measure e P22 phosphor Polished faceplate standard dark tint light transmission 57 none glare deflection angle 90 degree dot pitch 0 28 0 82 Optional finer pitches available INPUT SIGNALS e Video Red Green Blue separate input Impedance 75 ohm amplitude 0 7Vp p e Horizontal scan 31 5 KHz 35 5 KHz TTL positive or negative e Vertical signal 50 70Hz VIDEO CHARACTERISTICS e Video bandwidth 45MHz Power supply universal 90 250vAC Resolution VGA sVGA e Linear distortion 10 max e Geometric distortion 3 0mm max top bottom 4 0mm max left right ENVIRONMENTAL CONDITIONS e Operating temp 0 55 degree C Complies with UL CSA and TUVradiation performance standard pg 1 1428 30k series MECHANICAL The 14 monitor is also available in universal mount brackets The monitor can be mounted in the user s cabinet horizontally or vertically e the models are available also as a kit without a frame Custom frames can be fur nished also available in the chassis form adaptable to individual customer requirements USER ADJ CONTROLS AND A
11. C501 C502 and L501 This line filter tends to reduce the noise of con ducted EMI from monitor into the power line 1 2 INPUT RECTIFIER CIRCUIT The input rectifier circuit is comprised of BD501 and C505 BD501 and 505 is full wave mode rectifier 1 501 is used to reduce the surge current while the power supply is turned on 1 3 START UP CIRCUIT The resistor R502 provides the start up current of IC501 The turn on and turn off thresholds of under volt age lockout circuit in IC501 are set up internally at 16vDC respectively To start up C506 must be charged to 16vDC with a current of 0 3mA 0 5mA which depends on the IC501 start up current characteristics and R502 resistor value 1 4 CURRENT MODE CONTROL OPERATION When Vcc of IC501 pin 7 is charged to more than 16V there is a square wave on the output pin 6 which can be adjusted to peak Amp for driving the gate of Q501 The current mode sensing resistor R513 senses the primary current wave in order to control the current mode PWM and limit the total output power Pin 2 and pin I is an error AMP section IC501 detects the output voltage while the line voltage and load current change 1 5 OVP CIRCUIT ZD502 is the OVP circuit over voltage protection If an over voltage condition exists the ZD502 will shut down IC501 Per above related considerations a switching power supply is a relatively complex circuit see functional block diagram It is apparent here that the heart o
12. ER E ar 4 E vz nes og 5 0507 uh HUN x 501 Hm SE am xe 2 EE EY SS OV GU ew d ii 3 371 EE 8 8901 sem Bv EI vm hav FOCUS 2 bsp i p Y SCREEN m 7 EET V 5 FI 5 EA DEGAUSSINS E 150K oL lt oe 10 196 x for S m zou s CORRECTION P z m F7 Ey 1 as mus 11 R518 L T gt ird Sm L vaser 2 E E ge Irc 302 7 Te DS km3080 s ae E E B H SYNC gt FROM E T M 907 x ue 3 d giae Dd k Ree pe ae SU 4 me b E d Ssg L m 2 T602 1 Sen NOTES g 1 RESISTOR VALUES IN 1 000 1 000 000 2 ALL RESISTOR ARE 1 8WATT EXCEPT WHERE OTHERWISE INDICATED 3 CAPACITOR VALUES ARE uf UNLESS OTHERWISE INDICATED P pf 4 ALL CAPACITOR ARE 50 VOLTS EXCEPT WHERE OTHERWISE INDICATED 5 J88 15 USE J4 14 USE ATSTEL E uz Ts Wu s Ex OLNV 305 8501 INV3IDVIG OLLVINHHOS AGN u Ttef XD CC O31U210NI 38IMHGKuD REHM 1235X3 51704 OS 301124942 Te p 39 d Q318010NI 3CIMMIHID 55377 jn NI 299 SIWA 5012540 E a CBLEDTONE JGIMMIHUD 3432 1019 3 LiUMC T 154 TE BBO BOS Tak 9004153 I
13. RES 560K 1 4W J TAP RES 180H1 AW J TAP RES 220H1 2W J RES 220H1 4W J RES 390H1 4W J RES 470HIAW TAP RES 750H1 4W J TAP RES 820H1 4W J RES 5 IK14W J TAP RES 36K1 4W F TAP DIODE 1N4148 TAP m nm N DIODE 1144002 TAP DIODE HER105 TAP DIODE 52 TAP DIODE FR103 TAP DIODE BA159 TAP DIODE FF1003 TAP DIODE HER205 TAP ZENER DIODE 5 1V TAP ZENER DIODE 6 2V TAP ZENER DIODE 9A2 TAP ZENER DIODE 18V TAP PEAKING 560UH J TAP JUMPER 0 6D 5mm TAP JUMPER 0 6D 7 5mm TAP 14 NN WRN e JUMPER 0 6D 10mm 19 R302 R503 R604 R349 R336 R809 R507 R617 R512 R505 R907 R524 R603 R612 R613 R614 R347 R806 R909 R635 R303 D907 D908 D909 D801 D802 D803 D804 D301 D904 D508 D504 D901 D502 D503 D505 D605 D509 D510 D511 ZD801 ZD601 ZD901 ZD501 ZD502 L601 L801 159 3 J5 J6 J12 J13 J21 J23 J41 J44 J50 J51 J52 J53 161 198 1 14 5 6 17 J18 J20 J22 J25 J36 138 139 145 147 148 149 155 pg 31 1428 30k series 6 622 106 9201 622 106 1501 MAIN BOARD 307 104 1580 307 103 1170 307 560 1160 307 101 1160 307 221 4570 307 221 1160 307 471 4560 307 681 1160 307 102 4570 305 223 0550 305 222 0550 305 472 0550 318 104 6350 318 224 6350 318 334 6350 313 153 0150 313 222 0150 313 102 0150 300 1R0 5020 300 2R2 2520 300 4R7 2520 300 4R7 5020 300 100 2520 300 470 2520 300 470 5020 3
14. generate saw tooth signal through a buffer stage to pin 15 TID to L502 power supply 15k R304 47K 22 9302 25612136 302 p 1 33K i 305 i 9301 6K 0301 58733 so 577 194002 aos 1000 E O iur 1M 25v s 2 es J rd 7 2200 22002 25 259 V IM vre 6128 VE Y i lt uang 301 IC6 1 IP to R907 FBT M FLYBACK T 315 i INPUT 10891628 55 IC3 1 oureur arut 280 PHASE i 2 P Q A113 le LIN UT ps We 1729 BLOK s s n 920 R302 SIZE sae 0 2K 1508 9 220 Q 923 R361 cue L 310 ax 7 L 304470 per 36K 17x 0505 100 4148 17 h C616 pags neo 4 70 41 goy 4148 RAZ 34 to 6 to VR301 A m N 1428 30k series 6 H SIZE CONTROL and PIN COMPENSATION The control of picture width and side pincushion compensation is achieved through changing the source volt age of the horizontal deflection circuit There s need for some components to build a diode modulator This circuit consist of C620 L602 C611 D602 D610 and H DY The parabolic wave is fed to the base of Q303 via double integrated circuit wich can generate a side pincush ion compensation wave The H width control voltage and parabolic wave are amplified by Q304 and Q306 th
15. input 31 5kHz timing with crosshatch pattern adjust VR604 to center the picture per specs Pincushion adjustment VR304 and VR301 input 31 5 kHz 640x480 timing with crosshatch pattern adjust VR304 and 301 to obtain the best pincushion pattern Focus adjustment display any character all over the screen set contrast in max and brightness in cut off po sition Adjust focus for best resolution possible Horizontal Oscillating Frequency connect a capacitor 10uF S0volt to Hsync from video PCB to GND than adjust VR601 till the sync slash blanking bar is vertically stable possible after that remove the jumper pg 19 1428 30k series Background white balance adjustment set all bias VR s 204 205 and 206 to max and let the raster to be invisible e display black pattern all video signals are disable and adjust SCREEN VR e as soon as the raster appears check out which color red green or blue comes out first e adjust bias VR of the other 2 colors to get gray raster adjust SCREEN from FBT to let the gray raster no larger than 1FT L gt White balance adjustment e use color analyzer photometer display center block patern set the brightness to mini mum than adjust the contrast VR to let brightness to be 35 FL and RGB balanced per Minolta reading gt X RAY protection seeting VR602 input 31 5 kHz 640x489 with crosshatch pattern connect the positive lead of multimeter to ZD601 adjust VR 60
16. 00 101 2520 300 221 2520 302 1R0 2520 302 100 2520 JUMPER 0 6D 12 5mm JUMPER 0 6D 1 5mm TAP HH 850 00T 1735 CC 0 1UF 50V Z 0 010 50 TAP 56 50 CC 100PF 50V K CC 220PF IKV K TAP CC 220PF 50V K CC 470PF IKV K TAP CC 680PF 50V K CC 1000PF IKV M TAP PEL0 022UF 50V J PEL0 0022UF 50V J PEL0 0047UF 50V J MEF 0 1UF 63V J MEF 0 22UF 63V 3 MEF 0 33UF 63V J PPN 0 01SUF 100V J PPN 0 0022UF 100V J TAP PPN 102PF 100V J EC 1UF S0V 85C TAP EC 2 2UF 25V 85C EC 4 7UF 25V 85C TAP EC 4 7UF 50V 85C TAP EC 10UF 25V 85C TAP EC 47UF 25V 85C TAP EC 47UF 50V 85C TAP EC 100UF 25V 85C TAP EC 220UF 25V 85C TAP NP 1UF 25V 85C TAP NP 10UF 25V 85C TAP 17 Q lt 0 don n QU oe lt n m J2 J4 J10 J24 J26 127 J28 J29 J35 J40 J42 J43 J46 254 56 57 737 31 130 J33 134 303 507 511 801 C806 C808 C321 C814 C621 C802 C803 C509 C519 C541 C608 C613 C513 C514 C605 C360 C341 C315 C905 305 314 508 C306 C602 C510 C601 C335 C606 C903 C603 C615 C616 C302 C333 C809 C904 C310 C311 C320 C512 C309 C506 C609 C804 C805 C312 C304 C313 pg 32 1428 30k series 7 510 000 0733 25 733 7 510 023 0945 25 945 TAP 6 510 023 1213 TR 25C1213 TAP 3 510 200 0422 TR BF422 TAP 1 510 200
17. 02 VR601 VR901 VR305 L502 L503 L604 1 602 L603 L501 T601 T501 X801 T602 FOR FBT FOR FBT HEA FOR FBT HER F501 FOR F501 B504 12601 10501 10501 1801 TP2 TP3 B502 501 302 303 903 8503 8801 8902 B601 B602 B602A pg 34 1428 30k series 9 621 100 0501 CONN 1015422 100mm 1 1 620 050 0400 WIRE 1015 18 50mm 1 735 014 1436 DEGAUSSING COIL 1 635 001 1428 GROUNDING 1 610 091 1003 SIGNAL CABLE 1436 1 621 395 0212 1015818 3 96D3P fth 1 395mm 1 820 001 8172 IC ASS Y TDA8172 12301 820 001 2485 MOSFET ASS Y 25K2485 0501 820 001 5149 TR ASS Y 2SC5149 Q602 820 001 1414 55 25 1414 9306 830 002 1735 VR ASS Y 850 002 1735 POWER BOARD ASS Y FE IC fn T 820 001 8172 IC ASS Y TDA8172 504 900 8172 IC TDA8172 1 1C301 120 001 8172 HEAT SINK 100 010 3032 SCREW R3 10mm ISO 111 314 0032 3D SPRING WASHER 110 003 2054 NUT 40 100 T220 TO 220 820 001 5149 TR ASS Y 28C5149 510 023 5149 TR 28C5149 1 Q602 120 002 5250 HEAT SINK 3832888 100 012 3032 SCREW R3 12mm ISO 111 314 0032 3D SPRING WASHER 110 003 2054 NUT POWER MOSFET 820 001 2485 TR ASS Y 2SK2485 511 001 2485 MOSFET 2SK2485 1 Q501 120 001 1794 HEAT SINK 1 106 014 3032 SCREW R3 14mm ISO 1 111 314 0032 3D SPRING WASHER 1 110 003 2054 NUT 1 540 100 1001 SRTO 3P 1 pg 35 1428 30k series 10 TR ASS Y TIP122 820 001 P122
18. 02 7203 7204 1205 1210 2215 1218 7226 J228 3231 240 241 752 001 1035 BEAT CORE PIN TAP 3 Q215 0216 Q217 622 106 1001 JUMPER 0 6D 10MM 6 J207 3209 J213 J216 2217 7222 pg 27 1428 30k series 2 622 106 9201 622 106 1501 BOARD 307 104 1580 307 103 3570 308 560 1160 300 1R0 0220 300 4R7 2520 300 100 2520 300 101 2520 302 1R0 0220 510 196 102M 510 200 0422 510 200 0423 510 190 2369 BOARD 213 2R2 2059 215 102 0559 307 103 6572 307 472 4572 300 470 0222 504 551 1203 233 303 0673 233 101 0673 560 150 0001 411 100 0003 630 001 2001 630 001 3001 630 001 6001 630 003 4001 630 010 4001 631 004 1001 631 004 1280 631 003 1400 560 150 0001 JUMPER 0 6D 12 5MM TA 1 JUMPER 0 60 15 TAP 1 TIRA 1 850 11 1735 CC 0 1UF 50V Z TAP 11 CC 103PF 500V M TAP CC 56PF 50V J NPO EC 1UF 160V 85C EC 4 7UF 25V 85C TAP EC 10UF 25V 85C TAP EC 100UF 25V 85C TAP NP 1U 160V 85C TAP TR KRC102M TAP TR BF422 TAP TR BF423 TAP TR PH2369 TAP Q UJ VL C C Q Ww 2 851 111 1735 MOF 2 2H2W J EA IK5W 507 1 CC 103PF 2KV M CC 472PF IKV M EC 47UF 160V 85C IC TH 203 VR B 30K 6mm YR VR B 100H 6mm 175 SPARK GAP 150V 14715 SOCKET BASE 1 56D 1P 6X9 BASE 2 36D IP BASE 2 5D 1P BASE XH180 3P 180 10 CONN 4P 400mm RHE CONN 280mm CONN 3P 400mm RK FRE 150V W m m m om o Q N Q
19. 0423 TR BF423 TAP 1 MAIN BOARD 342 851 001 1735 213 R68 1059 MOF 0 68H 1 W J E s 213 101 1059 MOF 100H 1W J E s 213 331 1059 MOF 330H 1 W J AR 213 R22 2059 MOF 0 22H 2W ER 213 103 2059 MOF 10K 2W J 213 181 2059 MOF 180H 2W J 5 213 122 2055 MOF 1 2K 2W J YA 213 2R2 205 MOF 2 21 2W J UR 213 100 2055 MOF 10H 2W J wt 213 1R0 3055 MOF 1H 3W J 213 273 3059 MOF 27K 3W J F R 213 124 3059 MOF 120K 3W J Ast 213 331 3059 MOF 330H 3W J FAC 218 5RO 0871 MIE NTC SH 219 140 0872 PTC 14H 307 103 4572 CC 0 01UF IKV M 319 471 2062 470 2 lt 0 5 315 104 2563 0 1UF 250VAC M 317 222 2572 0 0022UF 250VAC M 317 472 4072 4700PF 400V M 313 103 0652 PPN 0 01UF 630V J 309 824 0252 MPP 0 82UF 250V J 310 472 2052 0 00470 2 300 102 2522 EC 1000UF 25V 85C 300 100 0422 100 200 85 300 220 0322 EC 22UF 200V 85C 300 470 0222 470 160 85 300 221 0522 EC 220UF 400V 85C 300 471 2522 4700 25 85 300 471 3522 EC 470UF 35V 85C gt e Q Hn Noe N Qoa Q301 Q304 Q308 Q805 Q806 Q807 Q902 Q303 Q801 Q802 Q804 Q903 S601 Q302 Q601 Q904 Q504 Q306 R315 R316 R815 R618 R513 R522 R548 R615 R520 R339 R518 R633 R514 R526 R502 R516 R501 PT501 C516 C530 C550 C612 C501 C503 C504 517 620 C630 C611 C308 C523 C525 C902 C321 C520 527 C505
20. 2K1 4W J 210 153 0256 RES 15K1 2W J TAP 210 153 0456 RES 15K1 4W J 210 203 0456 RES 20K1 4W J TAP 210 223 0456 RES 22K1 4W J TAP 210 273 0456 RES 27K1 4W J 210 303 0456 RES 30K1 4W J 210 333 0456 RES 33K1 4W J TAP 210 473 0456 RES 47K1 4W J TAP 210 563 0456 RES 56K1 4W J 210 104 0456 RES 100K1 4W J TAP Quantity Location 1 1 2 5 WN e T R344 R342 R912 R311 R602 R620 R802 R803 158 R313 R318 R319 R510 R511 R634 R818 R902 R921 R804 360 R903 R343 R913 R914 R606 R08 R801 R317 R807 R340 R341 R521 R816 R830 R831 R832 R833 R922 R305 R307 R310 R812 R905 R619 R908 R920 R509 R810 R811 R817 R819 R820 R822 R823 R910 R911 R308 R345 R327 R611 R808 R504 R506 R515 R508 R301 R346 R609 R304 R309 R314 ROOT R906 pg 30 1428 30k series 5 210 154 0456 210 224 0256 210 224 0456 210 220 0456 210 470 0256 210 470 0456 210 514 0456 210 564 0456 210 181 0456 210 221 0256 210 221 0456 210 391 0456 210 471 0456 210 751 0456 210 821 0456 210 512 0456 221 041 3602 520 001 4148 520 010 4002 522 010 105 522 010 52 522 010 R103 520 010 A159 520 010 1003 522 020 H205 521 005 05C2 521 005 06 2 521 005 0942 521 005 18 2 745 561 1062 622 106 0501 622 106 9101 622 106 1001 RES 150K1 4W J TAP RES 220K1 2W J TAP RES 220K1 4W J TAP RES 22HIAW RES 47H1 2W J TAP RES 47HL 4W J TAP RES 510K1 4W J
21. 4 to obtain a 3 5 5 4vDC reading Purity adjustment is associated with convergence alignment see procedure required previous experience e display magenta color pattern adjust the purity magnet so that the picture is in magenta color By turning two overlap ping pawls in opposite directions move them until they are at the same angle 9 o clock and 3 o clock respectively as shown in fig 1 for static convergence adj as shown in fig 2 and fig 3 follow the next steps a display magenta crosshatch pattern b open the two pawls of the 4 pole magnets to allow the red and blue vertical line to unite c open and rotate the two pawls at a constant angle so that the red and blue horizontal lines can unite d if the vertical line deviates open the two pawls at the deviation position and make a minor adjustment by changing its angle e display cross hatch pattern f make the red and blue vertical lines at the center unite whith the green by opening the two 6 pole pawls g rotate the two pawls at constant angle so that red and blue horizontal libes can unite with the green f if the vertical lines deviate change the angle of pawls from the deviation pos pg 20 1428 30k series CONVERGENCE and PURITY DEFLECTION YOKE 4 POLES MAGNET 6 POLES MAGNET PURITY MAGNET PICTURE TUBE FIG 1 B R Conduct the abjusiment by means B R G Conduct the adjustment by means of of
22. DJUSTMENTS e HORIZONTAL size VERTICAL size e CONTRAST BRIGHTNESS VERTICAL center HORIZONTAL phase e SUB BRIGHTNESS RASTER center e SUB SIZE VERTICAL lin e SUB HORIZ size X RAY prot e HORIZONTAL hold B adj PINCUSHION GAIN e R G B bias R B Gain PRODUCT SAFETY NOTICE WARNING FOR CONTINUED SAFETY REPLACE SAFETY CRITICAL COMPO NENTS ONLY WITH MANUFACTURER RECOMMENDED PARTS AVERTISSEMENT POUR MAINTENIR LE DEGRE DE SECURITE DE L APPAREIL NE REMPLACER LES COMPOSANTS DONT LE FONCTIONNEMENT EST CRITIQUE POUR LA SECURITE QUE PAR DES PIECES RECOMMANDEES PAR LE FABRICANT pg 2 1428 30k series SAFETY PRECAUTION NOTICE Comply with all cautions and safety related notes located on or inside the chassis or picture tube The following precautions should be observed 1 design of this product contains special hardware many circuits and components especially for safety purposes 2 For continous protection no changes should be made to the original design unless au thorized in writing by manufacturer 3 Any design alterations or additions will void the manufacturer s warranty and will further relieve the manufacturer of responsability for personal injury or property damage resulting there from 4 Many electrical and mechanical parts in display sets have special safety related characteristics These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtain
23. E 3 9V YES CHECK PIN 5 OF IC301 DOES IT HAVE 40Vpp OUTPUT NO NO NO NO NO INSERT CONNECTOR TO B602 AND B602A CHECK 1502 D542 523 C308 REPLACE IC601 REPLACE C315 REPLACE IC301 pg 24 1428 30k series 1 3 IMPROPER VERTICAL SIZE VERTICAL SIZE DOES NOT AUTO SWITCH DURING MODE CHANGE ADJUST VR309 TO GET PROPER VERT HEIGHT ON 640X480 MODE CHECK VERT HEIGHT IN 640X350 640X400 IS HEIGHT WITHIN 5mm NO GOOD CHECK R805 R807 R808 R809 D802 AND D804 REPLACE BAD COMPONENT CHECK VOLTAGE ON PIN 10 11 12 OF 1 801 IF IT IS LOW OVOLTS DURING MODE CHANGE REPLACE 801 1 4 PINCUSHION ADJUSTMENT PINCUSHION MISADJUSTED MEASURE IF WITHIN 1 READJUST VR301 VR304 pg 25 1428 30k series 1 5 NO PICTURE PICTURE DISAPPEARS AFTER WARMUP OR IMMEDIATELY ON STARTUP CHECK 526 B VOLTAGE AT 31 Khz SHOULD 100V IF NOT CHECK POWER SUPPLY ADJUST VR602 TO ZD601 CATHODE VOLTAGE TO 5 4 DOES VOLTAGE 23 24 YES IS ZD601 CATHODE VOLTAGE 5 4V CHECK ZD601 C615 AND S601 1 6 FOCUS ADJUSTMENT PICTURE CANNOT BE ADJUSTED TO BEST FOCUS DOES CRT FOCUS G3 VOLTAGE EQUAL 5000 9000 VOLTS REPLACE FLYBACK TRANSFORMER T603 CRT SOCKET YES REPLACE CRT READJUST SCREEN AND FOCUS VR TO OPTIMUM SETTING pg 26 1428 30k series
24. Ihe knob opening angle knob opening angle Conduct the adjustment by means of the synchronous rotatlon of the kaob Conduct the adjust by means of the synchronous rotation of the knob FIG 2 Beam migration in application Beammigration in application of 4 pole magnets of 4 pole magnets rotated Beammigration in application Beam migration in application of6 pole magnets of 6 pole magnets rotated pg 21 1428 30k series MORE INFORMATION regarding convergence and purity All of the following procedures have been performed at the factory and should require no further attention H the monitor is serviced for any reason it should be observed afterward to determine whether any of these procedures need to be performed again OUTLINE OFCONVERGENCE AND SET UP PROCEDURE DEGAUSSING Demagnetize the shadow mask and all surrounding metal parts with an external degaussing coil PURITY Adjust the purity magnets and the yoke position STATIC CONVERGENCE Converge Red and Blue on Green in the center of the screen DYNAMIC CONVERGENCE Converge Red and Blue at the edges of the screen WHITE BALANCE Set Gray and White brightness tracking NOTE Purity and convergence adjustment interact DEGAUSSING The monitor is equipped with an automatic degaussing circuit How ever if the CRT shadow mask has become excessively magnetized it may be necessary to degauss it with a manual coil Do not switch the c
25. KHDIO NI SITA 90151535 S310N 184 JNIS H lt m 2 lt E 1428 30k series if eerie CREATION PERFECTION TEAMWORK 555 South KIRK Road ST CHARLES IL 60174 phone 630 443 1290 fax 630 443 1390
26. and cathode life it is recommended that the heater supply be regulated at 6 3 Y pg 16 1428 30k series DIMENTIONAL OUTLINE CHUNGHWA 14 CRT D ODA NO 10 077 REFERENCE LINE EXT INSULATING s EXT CONDUCTIVE COATING ENDTE 3 FRIT SEAL LINE 311 4 NOTE 3 gt 375 MINOR AXIS 248 212 0 INIMUM SCREEN DIAGONAL 335 4 13 204 HORIZONTA 280 8 11 055 VERTICAL 210 6 6 2919 BASE SPECIFICATIONS PIN 1 GRID PIN 4 C GRID NOD PIN 5 GRID NO PIN 5 CATHODE OF GREEN GUN PIN 7 GRID NO2 PIN 8 1 CATHODE OF RED GUN O PIN 9 HEATER PIN 10 HEATER PIN 1 CATHODE DF BLUE GUN PIN 12 IC CATHODE OF BLUE GUN 2 015 BOTTOM VIEW OF BASE pg 17 1428 30k series GENERAL ADJUSTMENT FACTORY SPECIFICATION Unless being specified Factory spec means the final adjustment made by the operator in the factory This adjustment is intended to be close to the standard display characteristics TEST SIGNAL video signals are identical and specified signals for standard VGA mode of 480 lines WARM UP TIME Minimum 15 minutes 1 required for warming up the monitor Direction CRT faces East Ambient lighting environment 400 to 600 lux AMBIENT TEMPERATURE 25 C 77 P TESTING MODE 640x480 800x600 upon request TOOLS and TEST EQUIPMENT Required e miniature flat screw
27. coil con A AC input Brightness B902 VR604 Raster cent VR901 subBRITE BIk GND ABL G1 B901 VR CONTROL INFORMATION CONNECTORS INFORMATION PRINCIPAL SECTIONS AREA KRISTEL 100 100 1428 30K PCB rev A with blanking circuit incorporated FIG 1A pg 5 1428 30k series MAIN 1428 30K Video power connector B503 VR601 H Hold LED power indic Sync connector Hsize B302 Vcenter B303 7 VR602 i VR308 sub H size VR310 V Lin Yoke B602A bod POWER SUPPLY C VR304 Gain b VR301 Pin 2 0501 MOSFET Bridge Rectifier VR501 B adj Tunning 61 Damping diode D602 Horiz drive trafo T601 Horiz Output 2002 Driver Resistor R615 L501 FCC choke Degaussing coil con AC input B501 VR901 subBRITE Brightness B902 VR604 Raster cent BIk GND ABL G1 B901 FIG 1A from left to right white VR blue HR green GP yellow GIDRV orange G1 not used black GND4 KRISTEL 100 100 1428 30K PCB rev A 4 NOTE for AutoBias optional configuration 902 is NOT used and B901 is like in fig 2A AUTOBIAS FORMAT FIG 2 pg 5A 1428 30k series VIDEO PCB CONNECTION INFORMATION amp PRINCIPAL SECTIONS AREA Load Resistors contrast conn video
28. driver plastic Hex wrench e ass t clips and 1uF SOv capacitor external degaussing coil color analyzer recommended MINOLTA 100 IBM PC compatible e digital multimeter pg 18 1428 30k series CRT diagnostic software included in Kristel 3 5 diskette hipot tester video generator TEST Bezel fixture model depending on customer availability PROCEDURE vu vgs Apply AC recommended power and video signal from customer supplied generator or use IBM compatible computer Adjust screen control FBT to be able to view screen amp focus control to best possible setting Convergence some fine adjustment with pre mated yokes to CRT can be achieved with magnetic tabs see instructions and theoretical considerations how to provide a best convergence Adjust B from VR501 per CRT requirement connect the positive lead of multimeter to D508 negative to chassis adjust VR 501 to obtain the voltage resulted from the spec of the CRT Select crosshatch pattern from video source 31 5KHz 640 480 Vertical linearity adjustment adjust VR310 to allow no more than 3 0mm max misadjustment Vertical size is performed from VR309 remote control potentiometer Width size adj is performed from VR307 and VR501 maximum attention for heater voltage maximum permissible value must be between 5 9 6 5vDC Horizontal raster centering is performed from VR604 Horizontal Phase adjustment
29. ed by using replacement compo nents rated for higher voltage wattage current etc 5 If severe arcing occurs remove AC power immediately and determine the cause by visual inspection incorect installation cracked or melted HV harness poor soldering broken wires etc 6 No modification of any circuit should be attemted Service work should only per formed after you throughly familiar with all of the safety check 7 Do not place the monitor on unstable surface If the product should fall it may be come seriously damaged and more importantly may cause injuries to the user 8 Follow all wanings and instructions marked on the product pg 3 1428 30k series IMPORTANT Do not check high voltage by drawing an arc Use a high voltage meter or a high voltage probe with a digital voltage meter When service is required observe the original lead dress Extra precaution should be given to assure correct lead dress in high voltage circuit area Where a short circuit has occurred those components that indicate evidence of overheating should be replaced Always use original components NOTE Make sure to turn power swich off before making the connection to the Anode Button WARNING X RADIATION Operation of this color monitor under normal conditions will not exceed the 0 5 mR h iso exposer rate Be sure that the anode voltage and other tube voltages are adjusted to the recommended values SHOCK HAZARD To remove any re
30. el for the video input signal through R204 IC201 increases the 0 7V p p nominal video input level to about 2 7V p p at pin 25 which then drives the base of Q202 The exact amount of gain is determined by the DC level on pin 12 the Contrast con trol input This DC level controls the gain of all three video channels simultaneously Q202 and Q205 operate as a cascode video output amplifier with a gain of about 15 The video swing at Q205 s collector is about 40V p p Q206 and Q207 operate as a buffer driving the red CRT cathode through R242 Q201 is driven by a horizontal retrace signal and supplies a negative going clamping pulse to IC201 pin 14 This provides DC restoration for the video signal by forcing the output of the video processor IC201 pin 25 to the same DC voltage as on pin 24 during horizontal retrace time i ty l EE 30383138 wr hor 25122058 2 0010 T du wt teta uaa ans leg im 15787 v mel U01SJ9A NOEN OWS qus E an BOT psoog 323N Ssoiq ojny KD at E 1 ggg s o S OSEE mwas iwa gr k e k av n tt 49149209203 945124 A AAA A C 1 3 NS 207 BOTY v GUERRE EET asl r3 m god
31. en they are fed to the diode modulator for controlling the source voltage of the horizontal deflection circuit to Horizontal YOKE to 601 D801 R336 229k to L503 to L608 to Q805 Q806 WRIOL BLOK CORRECTION to 522 to L503 ELECTRONIC WIDTH CONTROL schematic pg 14 1428 30k series 7 VIDEO AMPLIFIER CIRCUIT The video circuit includes video processing IC201 and video amplifier circuit Q211 Q205 and Q208 The analog video processor IC201 includes gain control and DC restoration Video signals RGB are input through the coupling capacitorsC206 C205 C204 and than sent to IC201 A cascode circuit is used to amplify each R G B channel The value for channel gain is calculated by collector and emitter resistances The L205 L204 and L205 are series peaking inductors The output amplifier circuit stage consisting of Q202 Q205 Q206 and Q205 is used to amplify video signal to 40Vp p and is represent one of the R G B channels 0202 50201 SG203 respectively R252 and R253 are arc protection components which protect electrical components when CRT arc condition occurs 8 CRT TECHNICAL DATA CHUNGHWA 14 2 C6 8 L GX10X11 16 lt 15 gt a TUN 9 2 POLE PURITY MAGNET BAND 1102 4 POLE CONVERGENCE MAGNET 453
32. f the supply is really the high frequency inverter It is here that the work of chopping the rectified line at the high frequency 20 200kHz is done Also the line voltage is transformed down to the correct output level The 60 Hz input line is rectified and filtered by one block and after the inverter steps this voltage down the output is again rectified and filtered by another The task of regu lating the output voltage is left to the control circuit which closes the loop from the output to the inverter pg 11 1428 30k series 2 SYNCHRONOUS PROCESSING CIRCUIT 801 circuit WT8041 sychronous signal processor of multi sync is of many functions such as the horizontal and vertical frequency discrimination display mode selection and synchronous pulse polarity detection Pin 15 and pin 16 work as a clock generating circuit Output pin 4 is active high while pin 5 is ac tive low fixed polarity and have the same pulse width as the original horizontal and vertical sync signal Pin 7 works as a frequency discrimination which is active low Pin 9 and 14 work as mode selector which controls output These output pins are to control Vsize Hphase and Hosc of every display mode 3 HORIZONTAL VERTICAL PROCESSOR The IC 601 is a combination horizontal and vertical processor The vertical SYNC is applied to pin 14 of IC601 Oscillation is determined by C306 R303 and C305 The saw tooth pulse generator built inside the IC can
33. n and blue bias potentiometers and even a brightness control The Automatic Biasing System is integrated into the video amplifier system OVERVIEW OF OPERATION The system works by sending a DC correction to each of the video amplifiers in response to cathode current changes resulting from a fixed step in G1 voltage During a setup and sampling period after ver tical retrace a fixed step is applied to the G1 grid while the three cathodes are held steady When bias conditions are correct this voltage step results in a small step in cathode current for each gun This step produces a faint horizontal line at the top of the screen visible if the vertical size is set low enough OPERATION DESCRIPTION Video System The basic video system consists of a three channel video processor IC201 and three video output stages Q205 Q202 Q206 and Q207 comprise the Red Video Output stage The Auto matic Biasing System adds a Bias Control Processor IC202 plus Beam Current Buffers IC203B D a G1 control circuit IC203A and clamping circuits IC201 contains three video preamplifiers with DC controlled gain and DC clamping 1 202 contains timing circuits sample and hold circuits and buffers The three video channels are identical so only the Red channel will be described in detail The Red video input signal is terminated by R201 and is delivered to the input of IC201 at pin 4 through R274 and AC coupling capacitor C201 Pin 11 supplies a DC bias lev
34. of this type the zero correction position is with the long tab of one ring aligned with the long tab of the other ee ring The way to determine which is which is by trying one of these orientations and then rotating the two rings together as a pair PURITY ADJ without changing their orientation with respect to each other If this TOP RED BLUE n rotation of the ring pair causes no change in the purity thenitisthe TEM ON GREEN ADJ zero correction position If the purity does change then try the other orientation pg 22 1428 30k series TROUBLE SHOOTING GUIDE 1 1 NO VIDEO SET CONTRAST NO VR TO MAXIMUM CHECK SIGNAL SOURCE CHECK INPUT NO SIGNAL ON P201 REPLACE SIGNAL CABLE NO ARE VOLTAGES ON PIN 1 23 28 OF IC201 EQUAL TO 12V CHECK C522 POLE DOES OUTPUT SIGNALS ON PIN 16 20 25 OF IC201 NO 3Vpp AND DOES 14 HAVE 12Vpp NEGATIVE REPLACE 1 801 PAUSE YES DOES C230 HAVE 100V DC NO CHECK D508 C521 YES DOES Q205 Q208 Q211 BASE NO EQUAL 9 2V REPLACE ZD201 YES CHECK VIDEO OUTPUT Q202 Q205 Q206 Q208 Q203 Q207 Q209 Q210 Q204 Q211 Q212 AND Q213 AND REPLACE FAULTY COMPONENT pg 23 1428 30k series 1 2 VERTICAL DEFLECTION HORIZONTAL LINE APPEARS ON SCREEN CHECK YOKE LEAD WIRE CONNECTION YES CHECK PIN 2 VOLTAGE FOR IC301 ABOUT 20V CHECK PIN 15 OF IC601 DOES IT HAVE A SAW TOOTH WAVE YES CHECK IC301 PIN 7 DOES IT HAV
35. oil OFF while the raster shows any effect frorn the coil CONVERGENCE E GAP GRIDS NO 5 AND 6 2 PURITY ADJ RING RED BLU ADJ COLOR PURITY ADJUSTMENT SHOWIN START nud m ING POSITION R u 1 For best results it is recommended that the purity adjustment be Tom GREEN ADU made the final monitor location If the monitor will be moved per FOR VIEW form this adjustment with it facing west or east The monitor must RED BLUE have been operating 15 minutes prior to this procedure GREEN N to O CLOCK RED BLUE 2 On picture tubes with a 22 5 mm neck diameter set the ring as EN 9 sembly on the CRT neck with the center line of the purity ring pair over the gap between grids No 5 and 6 3 Make certain that the magnetic ring pairs are in their correct start ing positions before beginning this procedure The correct startina position for the purity ring pair is not necessarily The correct starting position will vary from ring assemblies from one manufacturer to another It will be necessary to determine the correct starting position also known as the zero correction position Figure shows a ring assembly in which each of the rings of the purity ring pair has two tabs one long and one short With some ring assemblies of this type the zero correction position is with the long tab of one ring aligned with the short tab of the other ring On other ring assemblies
36. schematics is not refered as autobias video board pg 8 1428 30k series BLOCK DIAGRAM 100 100 1428 30K DRIVER OUTPUT TORG1I72 HORIZONTAL 110 240 vAC YORE CHARACTERISTICS of potentiometers REMOTE CONTROL BLOCK SIX CONTROLS or FIVE CONTROLS AB Hsize VR307 5Kohm Vsize VR309 10Kohm Contrast VR201 10Kohm pg 9 Vcent VR302 5Kohm Hphase VR604 Brightness VR901 100kohm 1428 30k series POWER SUPPLY CIRCUIT DESCRIPTION guide for switching power supply and components vr FUNCTIONAL BLOCK DIAGRAM Switching Power Supply The power circuit includes the lines filter input rectifier av D mme circuit start up current mode control and OVP Please refer to the circuit diagram to R815 R604 L601 to Q803 coll UI 1521158 X to R615 IC301 530 Mis I wp os Yet to pin2 Ss SELER 051 BEER to R339 R331 E ue RV 104 dta H SYNC ix FROM FBT tur en NOTES Jd 1 RESISTOR VALUES ARE IN O OHM 1 000 1 000 000 mm 2 ALL RESISTOR ARE 1 8WATT EXCEPT WHERE OTHERWISE INDICATED 3 CAPACITOR VALUES ARE IN uf UNLESS OTHERWISE INDICATED 4 ALL CAPACITOR ARE 50 VOLTS EXCEPT WHERE OTHERWISE INDICATED 10 pg 5 J88 15 USE J4 14 USE 1428 30k series 1 1 LINE FILTER CIRCUIT The line filter circuit is comprised of
37. sidual charge short the anode contact button located in the funnel of the tube to the external conductive coating before handling the tube TUBE HANDLING Tube assembly should never be handled by the tube neck deflection yoke or other neck components If suspending the tube assembly from the mounting lugs en sure that a minimum of two are used Under no circumstances suspend the tube assembly from one lug To protect the screen when placing the tube face down ensure that the tube face rests on a cushion kept free from abrasive substances or foreign parts TUBE REPLACEMENT This monitor tube incorporates integral X radiation and implosion protection and must be replaced with the same type number or recommended replacement to assure continued safety pg 4 1428 30k series MAIN 1428 30K Video power connector B503 VR601 H Hold LED power indic Hsize B302 Vcenter B303 POWER SUPPLY Hphase amp Vsize B601 VR310 V Lin Yoke B602A Z 049 E TE ner lj L VR304 Gain VR301 Pin 0501 MOSFET 2 Bridge Rectifier VR501 B adj Tunning 61 Damping diode D602 Horiz drive trafo T601 Horiz Output 0002 Driver Resistor R615 L603 Linearity coil VE ea FE ldem lt _ n i L501 FCC choke E 5 xx Fe Degaussing
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