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Содержание AAI-A Series

Страница 1: ... COLOUR TELEVISION TRAINING MANUAL FILE NO Chassis Series AAI A CIRCUIT DESCRIPTION BLOCK DIAGRAM OF Ics TROUBLE SHOOTING REFERENCE NO TI 520004 ...

Страница 2: ...ural Circuit 27 6 2 A2 Stereo Circuit 28 6 3 A2 Stereo Nicam Circuit 29 7 Double Full wave Rectifier Circuit 30 Part 2 Block Diagram of ICS 1 TDA8361 8362 dF Video Chroma Def Iect ion 32 2 TDA4661 V2 1 H Delay 33 3 TDA8395 cSECAM Decoder m mm 34 4 LA7833 Vertical Output m 34 5 TDA2546A V4 SIF Decoder 35 6 MC44131 PB Audio Multiple Decoder 35 7 TDA8204 cNICAM Decoder 36 8 TDA8205 NICAM QSPK Demodul...

Страница 3: ...Part 1 Chassis Description 1 Circuit Function Description The following figure shows a block diagram of the AA1 A chassis 1 REAR FRONT 3 AA1 A ...

Страница 4: ...llator requires no external components and is fully integrated This oscillator is always running when the start pin 36 is supplied with 8V and the horizontal drive signal is outputted from pin 37 VR401 is used for horizontal centring adjustment The separated vertical sync signal from the sync separation circuit passes through the vertical separation circuit and is applied to trigger divider circui...

Страница 5: ...y an increasing current flows directly to sawtooth waveform the DY to perform electron beam deflection During the first half of the blanking period the vertical ramp signal suddenly turns OFF Since there is no longer any current flowing into the DY the magnetic field collapses causing an induced current to flow as follows DY pin 2 pin 1 VR451 R459 C461 DY Once the magnetic field in DY has dissipat...

Страница 6: ...2 CPU The following figure shows a block diagram of the CPU peripheral circuit 7 il I I 0 a cu a c u 6 AA1 A ...

Страница 7: ...ption input SIF output D K 11 AFT S signal input 37 Option input SIF output I 12 ipc bus SCL line 38 Option input SIF output B G 13 12C bus S JA line 39 Option input SIF output M M 14 Tuning voltage output 40 System switch output SECAM 15 Ident signal input 41 System switch output 3 58 16 RC signal input 42 System switch output 4 43 17 43 Band switch output I Low VH 18 Chroma ID input 44 Band swit...

Страница 8: ...essed Q K1 5 SW CPU 35 4 34 47kzizEa47k 1 15 K3 o 15 6 8k K Kll 6 8 4 7 K5 2 4 7 2 7 K6 K13 2 7 1 8 7 K14 1 8 1 5 K8 K15 1 5 150 Inputvoltageto pin 35 I Kev I flangeofvolta9es I Function OFF K1 K2 K3 K4 K5 K6 K7 KR lessthan0 6V 0 6V 1 2V 1 2V 1 8V 1 8V 2 4V 2 4V 3 OV 3 OV 3 7V 3 7V 4 3V 4 3V 4 9V morethan4 9V NoKey Pos Pos vol TuSlow Vol Tu Slow Function PreseUMemory Colour System SIFSvstem i 10k ...

Страница 9: ...olour system r Pinll Ov 0 5V 1 2V 1 8V 2 5V 3 OV 3 8V 4 3V 4 9V SIF system r Swl on on off off on off 13 CPU 5 Rx 33 10k Rx open 82k 33k 18k 10k 6 8k 3 3k 1 5k 150 Specification Test PAL system VMT system PAL TV PAL M NTST NTSC AV East Europe system PAL N NTSC S ECAM TV AV Multi system PAUM NTSC NTSC SECAM TV AV China system PAUM NTSC NTSC TV AV nla nla nla CPU 10kx4 39 38 37 36 IL SW2 SW3 SW4 on ...

Страница 10: ... 5 CPU d H Sw Rx 47k 15k 6 8k 4 7k 2 7k l 8k l 5k 150 34 10k SW5 Specification off 2 AV system AV1 AV2 I on 11 AV system AV I SW6 Specification off w o remote control function on w remote control function Sw Specification off 60 programme positions on 30 programme positions AAl A 10 AA1 A ...

Страница 11: ...PAL NTsc4 43 SECAM NTSC SIF system switching output 1 Multi system SIF system a option SIF system Auto B G 5 5MHz I 6 OMHZ D K 6 5MHz M M 4 5MHz Output pins 39 38 37 36 HHH LHLL LLHL LLLH HLLL Display S1 S2 S3 S4 S5 It depends on receiving TV system 2 3 system SIF system b option B G 5 5MHz I input H LL I 6 OMHZ input L HL D K 6 5MHz input L LH Display S1 S2 S3 S4 3 China PX SIF system c option SI...

Страница 12: ...H input input S2 MIM 4 5MHZ HL input input S3 5 East Europe SIF system e option SIF system I Output pins I Display I 39 38 37 36 I Auto input H input H S1 B G 5 5MHz input H input L S2 D K 6 5MHz input L input H S3 6 No SIF system SIF system Output pins Display 39 38 37 36 input input input input AA1 A AAlA 12 ...

Страница 13: ... field frequency is 60 Hz 3 TV AV mode is TV mode CPU 18 CHROMA ID btE zzd 4 COLOUR R773 10k R774 220k 4 R775 12k 1 T U i Colour control D A circuit ICI 01 Chroma Def 26 COLOUR 2 5 Ident Identification The identification of the receiving signal status is done by the CPU sensing the voltage level at the input pin 15 as shown below The ident signal is presented at pin 4 of IC101 and fed to pin 15 of...

Страница 14: ...face for operation control between ICS and the CPU is used as the master for operation control of the Teletext decoder A2 Stereo decoder Nicam decoder and Memory IC The IPC bus is composed of the SCL Serial Clock Line and SDA Serial Data Line lines Data is transmitted over the SDA line in 8 bit units in synchronisation with the SCL line These lines are also used for the option function When the TV...

Страница 15: ... output signal as shown below table When the UHF band is selected High signal are sent from both pins 43 and 44 The D781 and D782 are cut off then Q784 and Q783 are turned on and 12V is supplied to UHF terminal on the tuner Antenna L Tuner VI VH u s Q781 4 4 7k 0782 4 7k Q783 4 Q784 Band Switching Logic output 1 Pin43 Pin44 I Q781 Q782 Q783 I Selected Band H L on off off VHF Low L H off on off VHF...

Страница 16: ... signal at pin 15 and the AFT S signal at pin 11 and controls the tuning voltage which is supplied to the tuner The CPU determines that the correct tuning point is achieved when the Ident signal is Hi 5V and the AFT S signal is between 2 OV to 3 OV When the Ident signal is Hi 5V and AFT S signal is greater than 3 OV the CPU judges that the tuning point is incorrect and increases the tuning voltage...

Страница 17: ...AFTIN 11 4 R780 150k Input Signal Pin 11 AFT S Curve of IC701 Input Pin 14 of IC701 Pin 15 of IC701 Tuning Voltage Ident Signal Input 3 5V 3 OV 2 OV 1 5V Ov Tuned point I Imut Voltacie Level of Pin 11 I Judgement LL oV 1 5V Tuning Voltage Down L 1 5V 2 OV Tuning Voltage Down M 2 O 2 5V Tuned H 2 5V 3 OV Tuning Voltage Up HH 3 5V 5V Tunina Voltaue Up 17 AA1 A ...

Страница 18: ...3 drives the LED D1120 to illuminate and indicate the stand by mode Protection circuit A protection circuit is provided to protect the TV set in case of a circuit malfunction When an abnormality occurs during TV reception it causes pin 31 of the CPU to go continually Low less than 2 OV After one second the CPU detects that a power failure has occurred on the TV set and the CPU turns the TV into th...

Страница 19: ...38 of ICI 01 The sandcastle pulse is extracted the horizontal components at the CR integrating circuit consisting of R796 and C791 The horizontal pulse inputted to pin 1 is made by the retrace pulse which is generated on pin 5 of flyback transformer If one of these pulses is not supplied to the CPU the on screen display cannot be displayed 1u 1 EY Horiz 4111111111111111111111111 CPU H SYNC 1 V SYN...

Страница 20: ...trolled by IC701 CPU output NTSC Band Limitter 5 101 TDA8362 F in V ir TV 011 HUE SECAM REF IF in CHROMA IE IDENT Time Base 13 NH f 3 W8 j u3 6 OMHZ Filter 5 S9 Q155 5 5 MHz Filter J c S8 Q154 4 5 MHz Filter h SIF Filter S7 Q152 1 S2 R lE 1 42 41 I Q203 IC280 SECAM z IC701 CPU o IDENT 4 5 3g o 5 5 5 38 1 Go 37 43 65 36 3 58 50 60 ID 2 _ V SYNC Pulse for OSD AA1 A AAl A 20 ...

Страница 21: ... System switch for forced 4 43 mode Q222 This switch is driven by ON OFF signal from CPU pin43 Note When the colour system is set to AUTO both S6 and S7 will turn on System switch for forced 3 58 mode Q221 This switch is driven by ON OFF signal from CPU pin42 System switch for 4 5 MHz filtering on NTSC 3 58 mode Ql 52 This switch is driven by ON OFF signal from CPU pin39 System switch for 5 5 MHz ...

Страница 22: ...l is fed through the 5 5 MHz 6 0 MHz trap X126 or the 6 5 MHz trap Xl 27 which remove the respective intercarrier sound contents The remaining video is fed to pin 13 of IC101 via the video equalizing circuit to compensate the characteristic of video This switching is shown in the table be ow CVBS in 13 Iclol lF Video chroma CVBS out 7 CPU 4 5 MHZ 39 _ _________________ d II I Video C216 Equalizing...

Страница 23: ...nals from pins 36 to 39 of the CPU The SIF signal is then fed via the relevant buffer Q152 4 5 MHz Q154 5 5 MHz Q155 6 OMHZ Q156 6 5MHz to the SIF input pin 5 of IC101 for de modulation 7 CVBS Output SIF Input 5 Iclol If Video chroma 4 5 MHZ 39 CPU 5 5 MHZ 3 6 OMHZ 37 6 5 MHz 36 CVBS Sound Carrier Outwt i Q153 0157 SIF Filterina Circuit 0112 C141 ni X151 4 5 MHZ E w F 111 www f IC181 Sound Carrier...

Страница 24: ...21 is turned on and Q222 is turned off As a result the oscillation of X201 for 4 43 MHz is stopped by applying the DC voltage For other colour systems using 4 43 MHz oscillation in a forced mode the CPU outputs a High from pin 42 and a Low from pin 41 which turns Q221 off and Q222 on The result is that X202 is prevented from oscillating by the application of the DC voltage via Q222 Crystal Select ...

Страница 25: ...deo signal supplied to pin 13 The selection of internal or external video source is performed in the IC101 by the TV AV drive signal sending from pin 10 of the CPU via inverter transistor Q202 In the audio signal the selected audio signals L R are supplied to the sound control IC IC1l 02 MC44131 PB and the selection of external or internal audio source is performed by the bus lines The following t...

Страница 26: ...5 lF Video Chroma Def Circuit The following figure shows a block diagram of the lF Video Chroma Def IC peripheral circuits 1 3 0 1 n s mm ml J y 1 nnn mu i 000 Zz iif i 3 3 cd A A 4 1 26 ...

Страница 27: ...diagram of the monaural audio peripheral circuits CPU 47 3 Mute ICI 01 TDA8362 lF Video Chroma IC801 45 6 46 7 5 50 1 Audio signal j Avl A di External Audio Input 15 J AV2 put 1 CVBS SIF 4 5MHz frompin39ofCPU Filtering 5 5 MHz from pin38 of CPU Circuit 6 OMHz from pin37 of CPU 6 5MHz from pin36 of CPU S1F Carrier I Q857K 858 4udio out IC1102 Audio 0U Jt AN5265s Audio output 1 C 23 Speaker Vol me C...

Страница 28: ...The following figure shows a block diagram of the A2 stereo audio peripheral circuits Nr INN 1111 2 m lno rLr3wul I IL I P E z u _ _ mu 7 0 9 y 3 9 5Q 52 26 lU g m Q m 2 n al a An L u E i co 0 u l I qns I Uy w 1 0 n AA1 A 28 ...

Страница 29: ...6 3 A2 stereo and Nicam circuit The following figure shows a block diagram of the A2 stereo and Nicam audio peripheral circuits msvvas O mu c L A 3 n s 0 8 c Z I I u c E u 00 5 r A qns I u ew 29 ...

Страница 30: ...in C508 As a result the DC voltage which is double of AC input voltage is observed between the output terminals KG 1 and KG 2 In the range from 145V to 290V AC input the full wave rectifier circuit is build up by switching the triac off as shown in fig 3 During the positive half cycle the current flows as follows AC plus D506 C508 C509 D509 AC minus and the negative half cycle AC minus D508 C508 C...

Страница 31: ......

Страница 32: ...z 7 1 VIDEO VIDEO POWER 3C DEKIHFCATCN H AND V COINCIDENCE AMPLIFIER RESET DETECTOR SEPARATION DEMODULATOR 31 I I b 1 I 1 1 I 1 6 PREAMPLIFIER 28 SWITCH MUTE TDA8361 NOISE ACC VOLUME DETECTOR AMPLIFIER MATRIX CLAMPS 2S SET I I I I 51 22 LIMITER PLL TRAP AND CHFOdlNAfKE CHROMINANCE LUMINANCE CLAMP BYPASS BANDPASS MATRIX SWITCH a j I 1 11 19 Ilo 5Z 12 16 13 15 14 25 26 21 17 I I I I I I i I I I I I ...

Страница 33: ...lse input Pin Symbol Description 27 HUE Hue control input 28 BYI B Y input signal 29 RYI R Y input signal 30 RYO R Y output signal 31 BYO B Y output signal 32 XTALOUT4 43MHZ output for TDA8395 33 DET 34 XTAL1 35 XTAL2 36 HOSC 37 HOUT 38 FB1 SCO 39 PH2LF 40 PHI LF 41 VFB 42 VRAMP 43 VOUT 44 AFCOUT 45 IFIN1 46 IFIN2 47 AGCOUT 48 DECAGC 49 TUNEADJ 50 AUOUT 51 DECDEM 52 DECBG Loop filter burst phase d...

Страница 34: ...ut 30 PDV Parity data validity flag output 10 Usl User bit 1 output 31 ADV Additional data validity flag output 11 Uso User bit Ooutput 32 VDD 5V supply voltage 12 SCL Serial clock IZCbus 33 DV Data validity flag output 13 SDA Serial data PC bus 34 SEL1 Language selection 1 input 14 SD Serial data PC bus 35 SELO Language selection Oinput 15 SCK Serial clock IZCbus 36 TEST1 Test 1 16 WS Word select...

Страница 35: ...IIN System I input 28 ADR Audio output right 8 AGC AGC filter condenser 29 DC1 De coupling 1 9 VCC2 12V supply voltage 30 DC2 De coupling 2 10 AVDD 5V supply voltage 31 AMOL Audio mute output left 11 LFIL1 Filter 1 left J 17 de emphasis 32 AMOR Audio mute output right 12 RG Gain adjust resistor DAC 33 CAP De coupling condenser 13 AGND3 Analogue ground 3 34 MAI Monaural audio input 14 RFIL1 Filter ...

Страница 36: ...L 10 3 MUTE 1 REFERENCES t 9 TURN ON AND OFF E Sc PROTECTION Tj TH PROTECTION 5 4 8 I 1 16 RF1 27K TDA7263M OUT L CF COUPL 10 STR811 45A Double Full wave Rectifier Switch 2 1 k 3 Triac 4 rl Z2 Z1 QI Q3 5 STR81145A Pin Function 1 Delay 2 TI 3 T2 4 Gate 5 Common 38 AA1 A ...

Страница 37: ... ...

Страница 38: ...sis Series AAI A Dead w Page 41 44 No picture No sound Page 45 1 1 No picture sound OK age4 I I 1 No sound picture OK b Stereo model Page 47 48 No sound picture OK Monaural model b Page 49 I I 1 No colour Incorrect colour phase No vertical deflection 40 ...

Страница 39: ...oth ends of Ov C521 w 1OV 20V T501 D521 D524 C521 Check voltage on pin 27 of IC701 4 IC701 Q521 R523 D526 C522 C729 C721 C722 L I 1 I A1101 L703 I 5V Observe voltage B2 24V on both ends of C365 when turning on TV set with RC transmitter The voltage rise up to 10V 24V once and then fall down to OV immediately IYes It operates protection circuit Go to next page No Check Power primary circuit Q313 Q3...

Страница 40: ...age on pin 31 of IC101 F I 5V IC701 R776 or detection circuit v Ov IC701 R792 Q792 Q793 Check voltage on Q353 collector P D361 I1OV 40V t Check voltage B1 140V on both 80V or less Short circuit on B1 line ends of C361 D351 C361 Q432 C426 D486 C1793 C1794 I 80V or more v Check voltage B2 24V on Ov terminal KAA 3 I24V t Check voltage B4 24V on pin 6 of Ov IC451 24V Short circuit on B2 line D355 C365...

Страница 41: ...0 C190 C733 C801 v I C1172 Check voltage B7 8V on pin 3 of IC352 1 8V Check waveform on pin 37 of IC101 Yes v Check waveform on Q431 collector w Ov Shori circuit on B7 line IC352 IC101 IC280 R368 C372 C407 C406 Cl 37 Cl 36 D215 C283 C282 L1 mIv Horiz ICIO1 D214 R408 R409 X201 X202 n 1 N 50 Horiz Q431 R431 C431 C432 C434 R434 T431 v Check voltage on both ends of Ov Check horizontal output circuit C...

Страница 42: ...artpoint symptom Dead v Check voltage on both ends of 5V or less Check CRT heater circuit C469 T471 R481 R475 D467 C469 I I I 10V or more Y Ov Check voltage on terminal KB l D485 C488 R485 T471 1 I 180V R476 D363 R776 AA1 A 44 ...

Страница 43: ...U on tuner when tuning L706 R765 R763 R704 R705 C707 C708 Cl 05 X701 R755 Yes OV to 33V R756 R744 R746 C781 C782 L705 J I 1 Is supply voltage l 2V observed No VL Q781 R778 Cl 03 on terminal LB HB UB on tuner VH Q782 R777 Cl 04 1 UHF Q783 Q784 R786 R787 Yes C106 Check AGC voltage on terminal OV or 8V AGC on tuner C131 R133 C130 C128 1 3V 6V OV or 8V Check voltage on pin 49 of IC101 VR120 R127 R126 ...

Страница 44: ...120 D123 R138 R139 L125 L126 Xl 24 X127 R148 R149 Is video signal observed on Q1 34 l 1 No Q135 Q134 Q132 R144 base R140 R142 R151 R152 L136 C145 C147 I Yes m v Is video signal observed on pin 13 of Icl 01 w I 1 I 1 I Yes Check voltage on pin 16 of IC101 I Ov Check voltage on pin 17 of IC101 C206 C712 R721 R718 Check voltage on pin 25 of IC101 3V 7V R231 R232 Cl 792 R1792 R1794 C1795 R1797 46 AA1 ...

Страница 45: ...Check Nicam decoder peripheral No sound on Nicam broadcast 1 Yes check AZ stereodecoder No sound on A2 stereo broadcast peripheral circuit I IC1103 RI172 R1176 R1177 I 1 No sound on all of broadcasts Check voltage on pin 15 of IC701 Y Check voltage on pin 45 of IC701 F IC101 C132 R767 C718 Q700 R706 D528 R526 C523 D527 I4V 5V t Go to next page 47 AA1 A ...

Страница 46: ... R1183 C1183 I I No t P l 0 3V Yes Check waveform on pin 5 of IC101 IC101 C122 C123 C138 R125 Check waveform on pin 14 of L l 0 3V No 1 SIF circuit peripheral circuit I IC181 Q102 R108 C182 X180 I IC181 c188 C186 T181 T181 I 1Yes I 4 Ch ck SIF filterina circuit No sound on 4 5 MHz Check Q112 Q152 X151 Q153 Q157 peripheral circuit No sound on 5 5 MHz Check Qll 3 Q1 54 Xl 52 peripheral circuit No so...

Страница 47: ...31 Q705 R708 C703 I 6 8V Check waveform on pin 2 of w Icllol IC1lO1 C1lO1 C1116 I Check audio output circuit I 1 speakers headphone I i 1 I No Check waveform on pin 50 of m Yes Iclol C1117 C1123 R170 I I No Check SIF filterina circuit No sound on 4 5 MHz Check Qll 2 Q152 Xl 51 Q1 53 Q157 peripheral circuit No sound on 5 5 MHz Check Q113 Q154 Xl 52 peripheral circuit No sound on 6 0 MHz Check Q113 ...

Страница 48: ...Yes No colour on PA1 SECAM system Q22 x201 1 No J Yes No colour on SECAM system IC280 C284 C285 L285 C281 C280 1 No No colour on all of systems Ov Check voltage on pin 1 of IC270 p IC270 C270 D275 C275 R275 L280 t Ov Check voltage on pin 26 of IC101 C211 R713 R715 C711 R775 Q771 1 I I 2 6V AAl A 50 ...

Страница 49: ...cessive green colour F 1773D211 Q1771 Q1772 Q211 VR1772 Loss or poor green colour Q211 R211 D202 R1772 Q1771 Q1772 VR1772 C1771 R1776 R1778 J1702 Excessive blue colour F R1782 D212 Q1781 Q1782 Q212 VR1781 Loss or poor blue colour Incorrect colour phase on NTSC system only Incorrect colour phase on all of systems R793 R732 R7233 R737 C715 IC270 IC280 IC101 C204 C205 C271 C272 51 AAl A ...

Страница 50: ...m No vertical deflection 1 11 letloriz nhllifl appears on the screen Check waveform on pin 4 of IC451 Yes v IC451 C452 DY D471 C461 R459 R455 VR451 C456 R454 R453 R452 C464 SW220 1 l lru 1 r 0 iCIOl R401 R456 C454 R402 C401 C402 R403 52 AA1 A ...

Страница 51: ...MEMO 53 AA1 A ...

Страница 52: ...A14800 Mayl 95 500 S1 SANYO Electric Co Ltd Printed in Japan ...

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