21CTU91BC
CRT COLOR TV SET
Page 1: ...21CTU91BC CRT COLOR TV SET...
Page 2: ...SERVICE MANUAL This manual is the latest at the time of printing and does not include the modification which may be made after the printing by the constant improvement of product AKAI 21CTU91BC...
Page 3: ...of Materials 3 Safety Precautions 7 TV Block Diagram 8 Replacement Of Memory IC 10 Service Adjustment 10 ICs Functional Description 18 Test point Waveforms 22 Purity Convergence Adjustment 23 Explore...
Page 4: ...1 R303 37 RT 1 6W 100K J 5 R313 R554 R716 R802 R837 R110 R111 R208 R209 R210 R212 R306 R307 R710 R711 R712 R714 R715 R823 R824 R825 R826 R838 R109 R211 R576 R602 R611 R612 R614 R702 R723 R811 R812 R81...
Page 5: ...D552 D554 D555 101 IN4148 8 D404 D461 D516 D558 D565 D566 D601 D701 102 IN5399 RL207 4 D501 D502 D503 D504 103 RU4A RU4AM 1 D551 104 CD110 160V 100UF M 2 C403 C551 105 CD110 16V 100UF M 5 C208 C219 C2...
Page 6: ...RY 1W 180 J 1 R305 159 RY 1W 1K J 1 R404 160 RY 1W 1 J 1 R304 161 RY 2W 0 47 J 1 R601 162 RY 2W 12K J 3 R915 R925 R935 163 RY 2W 15K J 1 R569 164 RY 2W 2 2 J 1 R561 165 RY 2W 270 J 1 R454 166 RY 2W 4...
Page 7: ...V100K 1 A101 207 W206 2AL20K K 1 RP551 208 MTZJ3V3 3C2 1 D703 209 MTZJ3V6 4A2 1 D509 210 MTZJ5V1 5C2 2 D801 D802 211 MTZJ5V6 6B1 2 D567 D564 212 MTZJ8V2 1 D941 213 MTZJ8V2 9A2 1 D402 214 MTZJ8V7 9B2 1...
Page 8: ...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...
Page 9: ...MA IN R MAOUTL RGB OUT V OUT H OUT Vo V2i AR i1 R G B ARi 2 ALi 2 ALi2 ALi1 24C08 POWER UNIT 130V 24V 13V 8V 5V 3 3V CRT PCB V IN TDA8177 V OUT H IN H OUT H OUT DY 200V SCREEN FOCUS TDA11105 XXXX Vi1...
Page 10: ...9...
Page 11: ...aw factory mode 5 The TEST will be displayed on the screen 6 Check the setting value of the SYSTEM default value of Table below If the value is different select items by CH CH keys and set value by VO...
Page 12: ...center correspond to CRT horizontal center Receive NTSC signal and repeat above M0 and M1 adjustment M2 Menu AGC Adjustment Receive 60dB 1mV VH colour bar pattern signal adjust AGC value voltage from...
Page 13: ...justment 30 0 H PAR 63 32 Picture parallelogram adjustment 31 0 H BLK SW ON OFF Horizontal blank switch ON M1 TV DVD CL 0 15 Contrast level offset 13 BLOC 0 15 Black level offset course 6 R BIA 0 63 R...
Page 14: ...ve peaks 2 TCI2X 0 1 Top sync clamp current of the CVBS Y input clamp 0 clamp current about 80 uA 1 clamp current about 160 uA 0 BKS ON OFF Baack stretch ON BSD 0 1 Black stretch Depth 0 15IRE 1 30 IR...
Page 15: ...is 2 mA 0 FSPS 0 1 Selection of left or right hand side in split Screen mode 0 FSPB 0 1 Blanking in split screen mode 0 FSPE 0 1 Enable split screen mode for demonstration of features 0 HCO 0 1 EHT t...
Page 16: ...f 0 DTR 0 1 Chroma trap mode 0 single chroma trap 1 dual chroma trap more suppression but less bandwidth 0 Y P 0 15 Y delay adjustment for PAL signal 8 Y N 0 15 Y delay adjustment for NTSC signal 8 Y...
Page 17: ...N SIF PRI ON OFF Force sound system as auto search ON POWER REST 0 3 AC power on start selection 1 BANLANCE ON OFF AV stereo selection ON AV STEREO OFF MONO OFF HALFTONE ON OFF Half tone select OFF ME...
Page 18: ...eys The LOGO perpendicular position adjust 1 adjusts upward 2 get down adjustment Press 3 4 keys The LOGO level position adjust 3 is to the left adjustment 4 rightwards adjusts Press 5 6 keys The colo...
Page 19: ...Automatic volume leveling EAST WEST drive output DECBG 17 Band gap decoupling SECPLL 18 SECAM PLL decoupling GND1 19 Ground 1 for TV processor PH1LF 20 Phase 1 filter PH2LF 21 Phase 2 filter VP1 22 1s...
Page 20: ...tle output LSR 58 Audio output R LSL 59 Audio output L C2 C3 C4 AIN5R 60 S VIDEO C IN AIN3 IN1R 61 R AUDIO IN CVBS2 Y2 62 AV2 VIDEO IN AIN2 1INL 63 L AUDIO IN CVBS Y4 AIN5L 64 AV1 VIDEO IN TDA7266SA W...
Page 21: ...t c n u J e c n a t s i s e R l a m r e h T Rth j amb W C 8 4 t n e i b m a n o i t c n u J e c n a t s i s e R l a m r e h T ELECTRICAL CHARACTERISTCS VCC 11V RL 8 f 1KHz Tamb 25 C unless otherwise s...
Page 22: ...cy 0 010 0 1 1 10 k 0 2 k 0 1 k 1 0 0 1 THD Vcc 11 V Rl 8 o hm Pou t 100m W Pou t 2W fr eque nc y Hz 5 000 4 000 3 000 2 000 1 000 0 0 1 0000 2 0000 3 0000 4 0000 5 0000 10 100 1k 10k 100k Level dB r...
Page 23: ...est point Waveforms TDA8177 ST9302 LA78040 or LA78041 PIN 1 2 3 4 5 6 7 V 0 7 15 12 15 0 3 15 9 0 07 V451 C 5Vpp 0 9Vpp 1000Vpp 1 3Vpp H H 1Vpp V H H CRT KB CRT KG CRT KR 95Vpp 95Vpp 95Vpp H H H T511...
Page 24: ...the center of the screen Fig 3 8 Move the deflection yoke forward and fix the position of the deflection yoke so that the whole screen will become green 9 Insert the wedge to the top side of the defle...
Page 25: ...convergence DYNAMIC CONVERGENCE ADJUSTMENT 1 Move the deflection yoke up and down and overlap lines in the periphery Fig 2 2 Move the deflection yoke left to right and overlap the lines in the periph...
Page 26: ...21CTU91BC...
Page 27: ...AKAI 21CTU91BC AKAI 21CTU93BC AKAI 21CTU94BC...
