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File name akira_tv_ch_A21T01_CT-21FDS1.pdf

Colour TV Service Manual 2 Model Group: CT-21FDS1 CHASSIS: A21T01(TB1238) MODEL: CT-21FDS1 Model No: CT-21FDS1 Version 1.0 3 CONTENT GERAL DESCRIPTION... 4 SAFETY INSTRUCTION ... 6 CIRCUIT ADJUSTMENT... 7 FAULT FINDING TREES, DIAGRAMS & OVERVIEWS ... 14 VARIOUS PARAMETERS OF INTEGRATED CIRCUIT ... 22 ELECTRICAL PART LIST ... 30 CIRCUIT DIAGRAM ... 40 Model No: CT-21FDS1 Version 1.0 4 GENERAL DESCRIPTION AKIRA AKTP01 is a CTV monolithic chassis currently developed by AKIRA Co. It introduces a monolithic IC TB1238AN developed by Toshiba Co. To carry out all the small signal processing TB1238AN is a kind of IC used by color TV in PAL/NTSC system, which is controlled by Inter IC Bus. Together with the SECAM decoder TA1275Z, it can form a signal processing circuit for multi-system color TV. This chassis is used in many fashionable TV receiver technologies, which makes the performance reach the advanced level of the world. Figure 1 shows the block diagram of AKTP01(A21T01). Table 1 provides A21T01 mainly ICs and functions. Figure 2 shows the whole set power supply system for AKTP01(A21T01). Figure 3 shows the system control circuit of AKTP01(A21T01). Table 1: A21T01 mainly ICs and functions Type Location Function Description D901 87CM38N-3GN5/ System control microprocessor 87CK38N-2B46 D902 AT24C08 EEPROM N101 N252 N203 N201 N402 N701 N202 N701 N711 A903 LA7910 CD4053BE CD4053BE TB1238AN LA7830 TA1275AZ CD4052BE AN5270 AN5270 HS0038A Band decoder TV/AV switching AV1/AV2 Switch Small signal processor (IF/VIDEO/CHROMA/DEF) Vertical output power amplifier SECAM decoder Sound system switching Audio power amplifier (L) Audio power amplifier(R) Remote control receiver Model No: CT-21FDS1 Version 1.0 5 L OUT R OUT V OUT L IN1 R IN1 V IN1 L IN2 R IN2 V IN2 14 5 TV/AV switching 4 N252 CD4053BE 15 2 1 9 1 1 13 SIF TRAPS Z235~Z238 SIF BPS Z231~Z234 1 2 1 2 4 12 14 15 SOUND SYSTEM SWITCH N202 CD4052BE 13 VIDEO OUT TV AUDIO B 2 AUDIO AMPLIFIER8 N701 AN5270 4 2 L AUDIO AMPLIFIER N711 AN5270 8 4 R V23 V251 A V OUT 35 1 1 4 switching 13 N203 CD4053BE 5 2 12 9 10 11 1 AV1/AV2 3 TUNER TUN101 KEY BOARD V10 1 SAW F Z101 34 15 14 3 3 1 3 22 § 25 26 27 1 A VOL B SCL1 VOL 35 6 5 REMOTE RECEIVER REMOTE A903 MEMORY 5 (D902) ST24C08 6 AC150-260V