ABS535T SERVICE MANUAL
Contents
1. RESISTOR 1 16W 100 5 0603 R24 R25 R89 R116 R137 R175 0090004 SMD RESISTOR 1 16W 220 5 0603 R115 R29 R56 R59 R62 R63 R69 R70 R94 R1 0090230 SMD RESISTOR 1 16W 470 5 0603 8 1 R225 R5 0090220 SMD RESISTOR 1 16W 510 5 0603 R27 R122 0090239 SMD RESISTOR 1 16W 2000 5 0603 R64 R66 0090008 RESISTOR 1 16W 2200 5 R123 R126 R148 R3 R50 R133 R217 R218 R146 R147 R14 O 0090014 SMD RESISTOR 1 16W 1K 5 0603 9 R150 R152 R76 R77 R80 R82 R102 R103 R105 R110 0090019 SMD RESISTOR 1 16W 4 7K 5 0603 R111 R139 R156 R230 R1 R2 R38 R44 R 191 0090020 SMD RESISTOR 1 16W 5 1K 5 0603 R58 R45 R90 R192 0090225 SMD RESISTOR 1 16W 5 6K 5 0603 R78 0090022 SMD RESISTOR 1 16W 8 2K 5 R79 0560855 SMO Ha 1 R16 R43 R49 R54 R55 R57 R60 R R20 R21 RES NR MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION 0310067 SMD CAPACITOR 50V 152 10 0603 C159 C198 C40 C41 C44 C46 C47 C50 C53 C64 C66 0310072 SMD CAPACITOR 50V 103 10 0603 68 70 71 93 137 138 142 143 174 178 187 188 12 C9 C11 C22 C24 C26 C31 C48 C49 C51 C52 C55 C56 C59 C61 C67 C72 C74 C75 C78 C80 C82 C83 C88 C99 C103 C105 C 10084 SMD CAPACITOR V 104 80 209 C80 C82 C83 C88 C99 C103 107 109 114 116 119 123 126 127 179 199 200 201 202 203 204 C144 C145 R201 16V 105 8096 2096 0603 C160 C197 C5 50V 333 596 X7R 0603 32 35 12. ma RF small signal phase inversion and amplification input PLLVSS Phase lock loop grounding IDACEXLP MINA S VREFP mm crossover checking Il BA5954 5954 is a piece of servo drive single piece integrated circuit with built in 4 channel BTL drive circuit It can receive directly the PWM control signal output by digital servo IC and with internal wave filter and drive amplifier it pushes the execution part in the servo mechanism to accomplish the focusing tracking feed and main shaft drives BA5954 adopts the packaging of 28 pins Note The 28 pins of 5954 are for outputting effective control signal which is provided by the 50 pins of MT1389 When the signal is in high power level BA5954 output is in validity while the signal is in low power level BA5954 will not be activated and its output ports are in the state of cutoff The functions of pins of BA5954 as the following table Main shaft control signal input RR mm VOSL Main shaft drive inverse voltage output NE VOLD Feed drive inverse voltage output ms ye wee III 22LV160BE 29LV160BE is a type of 16Mbit FLASH memory manufactured via 0 23um technology with 16 byte width 200 2015 memory capacity of 16M bit operation voltage of 3 3V and packaging method of 48 pins TSOP The specific operation mode is as the following table
3. pa 1 pa NI pa oo 3 NEM EMEN p KENN PE RR pp p RA Low RE EMKA LO D PE FE EN SP Eis Em 4 pa TEZISLV Tracking zero crossover error input DMO FMO Feed control signal output TROPEN PWM Tray Open signal output PWMOUTI ADIN9 First route pulse width demodulating signal output AD universal input Tracking control signal output Focusing control signal output 33 USB_VSS USB grounding USBP USB data TRO O FO USBM USB data USB_VDD3 USB 3 3V power supply FG ADIN8 Motor sensing signal input AD universal input TDI ADIN4 Open position detecting signal input AD universal input TMS ADINS Close position detecting signal input AD universal input TCK ADIN6 BA5954 enabling signal output AD universal output 52 97 122 1520 1730 221 DVDDI8 Digital 1 8V power supply 53 58 IOA2 7 Micro controller address bit 2 7 HIGHAO Micro controller address bit O 60 61 18 19 Micro controller address 18 19 6208509401160 1190 1340 1440 1480 1610 1630 1750 2160 223 TDO ADIN7 Tray close 2 universal Digital grounding APLLCAP Analogue phase lock loop external ON capacitor DE pm HIGHA3 7 Micro controller address bit 3 7 730 800 1080 1270 1410 1550 1670 1820 2040 212 741 75 HIGHA 1 2 Micro controller address bit 1 2 d IOA20 Micro co
4. 2 N 6 2 MIN Y W n R gt EN ps 7 28 1 2 E 4 4 2 pas EC 7 8 2 0 0 2 8 2 4 ES LO E a SCL LRCLK SCLK SDIN4 SDIN3 SDIN2 SDIN1 PSVC VR DIG DVSS DVSS DVDD BKND ERR DVSS VALID 5 WM_M_1 WM M PWM WM M_ M PWM_P 4 PWM PWM 7 PWM 7 PWM 8 8 DVSS PWM DVDD PWM PWM 5 PWM P 5 PWM 6 PWM P 6 PWM HPML PWM HPPL PWM HPMR PWM HPPR MCLK RESERVED 5 y z zm ELE 5 N y z lu lt Output PWM signal is displayed normal valid in high level P P P P P P P P M signal output 4 1 8V reference voltage of PWM core M signal output 7 P PWM signal output 7 P M signal output 8 W W W W W W W W W W W Logic error control pin valid in low level Digital grounding PWM signal output 8 Digital grounding for PWM signal 3 3V voltage for PWM signal IV IC 55112 55112 is an audio power amplifier of high performance made by TI Bridging with 60 loading each channel can output 50W It has 95DB dynamic range low distortion degree and low rate of heat generation with power efficiency up to 9096 It also has functions
5. 208 2015 Operation NR CE OE WE A0 A19 DQ0 QD7 BYTH high BYTE Low level level ee A EB ee high high resistance high resistance resistance Output High utpu E ig forbidden resistance x H x High resistance The functions of pins of 29LV 160 are as the following table a 28 29 36 38 44 200 2014 15 byte data bus 37 Character extension mode as the data line byte expansion mode as the address line 47 BYTE Adopting 8 byte in low level or 16 byte output mode in high level Reset valid in low level 100 130 14 Neutral pin IV AE45164016 AE45164016 is type of 64Mb 4Banksx 1 16bit CMOS synchronization DRAM featured with large memory and high speed Its operation power voltage is 3 0V 3 6V and it is packaged in 54 pin TSOP The functions of pins of 45164016 as the following table 10 14 27 3 3V power supply 20 40 5D 70 80 100 HH 130 420 440 450 470 480 290 15 16 byte data bus 50 51 53 3 9 43 49 3 3V power supply LDQM Data I O shielding signal 15 Data I O shielding signal V Pin Functions of TAS5508 TAS5508 18 a high performance audio signal processing IC provided by TI It has 8 channel PWM processing function perfect protective functions low distortion degree and excellent dynamic characteristics level RESERVED Connect to digital grounding TBASE SEL Connect to digital grounding
6. SELF TAPPING SCREW 4000564 SELF TAPPING SCREW 4000627 SELF TAPPING SCREW AMPLIFIER BOARD 2100006 F0 6 SHAPED 12 5mm R42 0000540 CARBON FILM RESISTOR 1 2W1500 5 SHAPED 12 5 R91 R9 0010233 METAL OXIDE FILM RESISTOR METAL POLYESTER FILM CAPACITOR METAL POLYESTER FILM CAPACITOR METAL OXIDE FILM RESISTOR 1 2W47O 5 SHAPED 12 5 R188 R46 0210145 CL21X 100V 104K C5 C140 C141 C42 C45 0210165 CL23X 63V 474 5 5 43 90 139 184 69 0010282 3W1K 5 SHAPED R 20x 8 R198 0260127 CD CD11 16V4 7U 20 5x 11 2 84 87 91 92 113 125 8 13 54 58 86 104 108 110 1 12 165 19 57 63 79 128 62 0260019 CD CD11 16V10U 20 5x 112 0260025 CD CD11 16V47U 20 5x 11 2 0260028 CD CD11 16V220U 20 6x 12 2 5 189 190 94 85 146 15 0260618 CD11 10V330U 20 6 3x 11 2 5 C166 C167 0260048 CD CD11 35V470U 20 10 20 5 172 173 176 177 185 186 0260491 CD CD11K 35V680U 20 13x 20 5 C36 C37 C133 C134 0390057 MAGNETIC BEADS INDUCTOR _ RH354708 FF 0390168 INDUCTOR 100UH 10 0410 SHAPED 12 5mm L14 so CCC _ EE em 0090001 SMD RESISTOR 1 16W 00 5 0603 EOD Reds R209 R206 R219 R229 1 16W1 50 5 0603 R34 R37 R134 R136 R186 1 16W 3 30 5 0603 R40 R41 R67 R140 R141 MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION 0090003
7. 3 DTS double decoding decipher MP3 and is also compatible to DVD Audio decoding to achieve high resolution sound restoration in 1000 times higher than CD By utilizing the 8032 microprocessor with built in chip MT1369E can also realize the system control function of player which simplifies the circuit design substantially The pin functions of MT1389 are as the following table E AGND Analogue grounding DVDA DVD RF high frequency AC coupling signal A DVDB DVD RF high frequency AC coupling signal B DVDRFIP DVD RF high frequency AC coupling signal RFIP input DVD RF high frequency AC coupling SKG signal RFIN input DVD RAM main light beam RF DC signal input A DVDD DVD RF high frequency AC coupling signal D MA 4 DVDC DVD RF high frequency AC coupling signal C DVD RAM main light beam RF DC signal input B DVD RAM main light beam RF DC signal input C DVD RAM main light beam RF DC signal input D DVD RAM auxiliary light beam RF DC signal input A DVD RAM auxiliary light beam RF DC signal input B DVD RAM auxiliary light beam RF DC signal input C DVD RAM auxiliary light beam RF DC signal input D CDFON CD focusing error phase inversion input CDFOP CD focusing error phase input 3 light beam auxiliary PD signal phase inversion input 4 light beam auxiliary PD signal phase input CSO RFOP Main servo signal output RF phase output RFLVL RFON RF level output RF phase inversion output ER E
8. Circuit of System 1 Reset circuit is as the Figure VI AVCC Figure VI The reset circuit of the player consists of triode Q204 9014 reset capacitor TC217 100uF 16V and phase inverter 0205 HCU04 In starting up as the terminal voltage of capacitor cannot be changed suddenly the basic of Q204 is in low power level After the cut off of Q204 its emission polar is in low power level after secondary phase inversion by U205 and regulation the low power level reset signal is outputted to the Pin 110 of MT1389 to reset MT 1389 When the recharging of TC217 is finished the base of Q204 will be in high power level Q204 will be conducted and the emission polar is in high power level After the secondary phase inversion and regulation by U205 a high power level is outputted and added to the Pin 110 of MT1389 to maintain high power level during its normal operation 2 Clock circuit The crystal oscillator of X201 27MHz C275 27PF C276 27PF and phase inverter HCUO4 form into clock oscillation circuit and the clock signals generated are added to the pins 229 and 228 of MT1389 through R244 and 4248 to provide operating clock for MT1389 3 Data communication circuit The data communication circuit of the player consists of decoding chip MT1389 SDRAM AE45164016 and FLASH ROM 29LV160BE as the Figure 1389 is a piece of super large integrated circuit with the operation voltage of 3 3V and 1 8V Its functions include RF small
9. MT1389 control When any of the controlling lines is in abnormality the radio reception will be in malfunction The RDS signal received by radio head will be delivered to the dedicated IC SAA6588 for processing Chapter IV Operating Principle of Power Board I Block Diagram This amplifier has two groups of power supply one is of low voltage for decoding board and low power ICS the other is of higher voltage for power amplifying IC But their design principles we only draw one functional block diagram of them II Introduction of Circuit Principle 220V alternating current is loaded on D501 D504 integrated bridging rectification circuit through power plug fuse tube voltage dependent resistor R501 and common mode rejection BC501 and L501 Diode adopts IN4007 which ahs better PPR and higher withstand voltage value than IN4001 Output 311V direct current after being bridging rectified is loaded on two transformers through TC501 filtering and transmitted to DRAIN control pins of switch modules 0501 and 0502 Service voltage of power on IC after being directly rectified and filtered is divided by resistors to serve IC Diode 0508 capacitor C516 and resistor R516 form absorption circuit to provide discharge circuit of reverse electromotive force for 1 4 coils of transformers Pin FB controlling IC is feedback control pin so you should decide on off time of pulse width according to current intensity on it to ensure stability of output voltage
10. There are 5 branch circuits coupled to sub grade through transformer 1 Voltage output from pin 11 and pin 13 of transformer T501 outputs a group of 28V voltage for power amplifying IC after being rectified and filtered 2 Voltage output from pin 16 of transformer T501 outputs a group of 12V voltage after being rectified and filtered 12V voltage is stabilized into a group of 5V voltage by IC LM7805 3 Voltage output from pin 14 of transformer T501 outputs 5V voltage and provide voltage for one end of photo electric coupler U502 after being rectified and filtered 4 Voltage output from pin 12 of transformer T501 outputs 3 3V voltage and provide a group of stable voltage for CPU after being rectified and filtered 5 Voltage output from pin 9 of transformer T501 outputs a group of 21V voltage for displaying driving IC after being rectified and filtered Clamp ZD501 of 21V provide heater voltage for panel display screen Grounding direct voltage of FL and FL is about 16V Operating principles of two groups of switch power are the same therefore we will only analyze the group providing 3 3V voltage for CPU here Feedback sampling of this group comes from 3 3V and supplies for photocupler HS817 through D516 and R506 At the same time it is divided through R508 and R509 for reference voltage pin R of 2 5V comparator When 3 3V becomes higher pin KA of comparator is on and the voltage is transmitted to pin 4 of switch IC 5L0380R after
11. process adopts TAS5508 with high integration and high performance and price ratio 4 It has the function of radio reception and the tuner adopts Sanzhenxing DTS 44K module 5 The power supply adopts the switching power with compactness high efficiency and stable performance 6 Equipped with SCART CVBS RGB port 7 Accessory channel input output function 8 Headphone output function 9 Karaoke and automatic accompaniment function 10 RDS function II Block Diagram of ABS535T Complete Player and IC Function Table Radio reception head a AT24C02 composite 29LV160BE S terminal Y Cb Cr MT1389 jndjno AV OAJOS 21814 818 DAHW 1889180 4 Figure 1 HI Function Table of ICs for ABS535T iew No Name Function Board iiir is N103 REMOT Remote receptor RF signal processing digital signal U201 processing servo processing MPEG decoding line scan system control Main Board U501 0380 Switching power circuit U502 HS817 Photo electric coupler U503 17431 2 5V reference voltage comparator LM7805 5V 3 terminal voltage regulated power supply U505 0880 Switching power circuit board N8 9 TLV272 Operational amplification 10 11 RC4580 Digital signal amplification Chapter II Operating Principle of Servo Circuit I Digital Signal Processing Procedure ABS535T adopts Sanyo double beam super err
12. signal preposition processing digital servo digital signal processing and accomplishing MPEG decoding and video coding The built in MCU of MT1389 is also the system control circuit of the whole player AE45164016 is a piece of 4M 16bit large capacity SDRAM with the operation voltage of 3 3 V In DV971 the 6ns module is adopted with high speed and the maximum operation frequency up to 166MHz Its main function is for operation buffer storage of decoding chip MT1389 to store the audio and video data stream in decoding 29LV160BE is a piece of 16Mbit FLASH ROM with the operation voltage of 3 3V mainly for storing the user s information including OSD character information operational microcode and LOGO in start up DMAO0 DMAI1 MT1389 0 015 AE45164016 29LV 160 26 28 47 Figure VII II Audio and Video Output Circuit 1 Video output circuit ABS535T can not only output three types of alternating line video signal including CVBS composite video S terminal Y C signal and Y Cb Cr color difference signal but also output two types of progressive line video signal including Y Pb Pr progressive line color difference signal and VGA progressive line signal The decoding chip MT1389 has built in video encoding circuit for direct output of analogue composite video signal CVBS 5 terminal color difference signal and VGA signal The CVBS composite video signal is outputted from the Pin 198 of MT13
13. 1 L321 L323 UT RR 0390095 SMD MAGNETIC BEADS FCM1608K 221T05 MATERIAL CODE INPUT BOARD m oF a a G ATA NEEDLE THE KB BREEN coms ET CARBON FILM RESISTOR 1 4W10K 5 SHAPED 10 CARBON FILM RESISTOR 1 AW47K 5 SHAPED 10 CARBON FILM RESISTOR 1 4W1MO 5 SHAPED 10 CARBON FILM RESISTOR 1W150 5 SHAPED VERTICAL 5 METAL FILM RESISTOR 1 4W2 2K 1 SHAPED 10 0881157 IC 0881661 IC 0881969 IC 0881182 0881031 0881990 IC 0881897 0881459 IC 0881378 2100004 2100006 2100007 0000274 0000431 0000433 0000294 0000301 0000310 0010134 0000615 0010062 0200105 504 508 510 512 513 519 520 1000 103 80 20 7 5mm 501 517 TTIE meos GOVT 2847002207410 165 CD11K 50V1U 20 5x 11 2 TC514 CD11K 50V47U 20 6 3x 11 2 5 TC515 20 1205 ET me fes 4P150 2 5 2 PINWITH NEEDLE THE SAME 2121574 FLAT CABLE DIRECTION 228 CORD XP100 6P120 2 5 2 PIN WITH NEEDLE THE SAME 2120886 FLAT CABLE DIRECTION XP102 MATERIAL CODE MATERIAL NAME SPECIFICATIONS 11x 15x 25 BLACK SINGLE HOLE PWT 26 5H BLACK ZINC POWER SUPPLY SWITCH BOARD 1780019 2P 390mm 0200230 400VAC 102 10 10mm 1563413 _____ 530 1 CONNECTION CORDS 2300033 FUSE 3020402 FUSE HOLDER 3580086 HEAT RADIATION BOARD 3580091 HEAT RADIATION BOARD 3580156 HEAT RADIATION BOARD 4000453
14. 1320200 BT 1N6263 R255 my qd _ 552 4 1228 TC237 EB DNS MS ATuF 16V Ana R246 100K 1 242 104 pa SI 3 R244 R248 TC217 n Do 100uF 16V gt TC209 Ok OR 220uF 16V P 0275 X20 co76 d 27 27MHz 27pF 24 2 7uH DNS C2158 27pF DNS ABS535T ARIANE 000 2535 0 HHHHHHHHHHHHHH SEGIO VFDI HNVCIOSM25 D2 IN4148 CPU SV GRID5 40 CPU SV K R5 R6 33K 33K 10K 10K RIS 10K 5 E 100uF 16V CPU SV o XS2 5 2 0 CPU SV R28 330 7 5MM Surface layer of MPEG amp SERVO Board Bottom layer of MPEG amp SERVO Board Surface layer of audio power amplifying Board O 9427 TH m Bottom layer of audio power amplifying Board Power Board e 5 4 552 CH D R527 1 R507 HD R528 10 05 er A 2 IE 6 516 WI R510 Fe 70501 R T3 15A 250V G oo 5535 1UL 117 ks 2005 0808 17503 R515 TC511 xsios A 6530 2 pcb Sat Mor 11 08 52 14 2006 BOM list DECODE BOARD ES 201 02 205 206 203 0260200 CD11C 16V47U 20 5x 7 2 TC204 TC210 TC247 TC248 TC2
15. 21 220R DASW 02 XC100B 000000JLsssssv 0000000000000 ij 00018 0 HHHHHHHHHHHHHHHH 75 330uF 400V XC502 104X2 3 L501 JBL2822 30mH 107 220 C517 103 1KV U505 0880 HER207 515 518 E 104 47uF 50V HERLOS ND H GND 501 103 1KV 1 502 FB RH357508 H GND 8505 756 506 12 502 1N4148 hM 47uF 50V H GND 0501 5L0380R HS817 A 501 400 102 A 1502 33R IW BCK 40 0726 BYW29E240 R522 csid 101 BRIW 518 R523 470uF 50V 1K 3W C521 12 TC517 2200uF 50V 516 2200uF 50V L503 10uH 2A SR560 C510 TCs09 Ds07 105 TCSL 220uF 35 U503 TL431 TOR IW DS02 DNS C9V1 1W 1504 LM7805 TCS08 Cs09 1000uF 16V 472 TCS10 1000uF 16V 7507 HS817 TL431 TC505 470uF 1 TC506 470uF 16V 47 TC512 470 16 472 XP100 102 E GRE IDR suo uau nojo uau nes lY m _ _ EE poo foc 0101 210 000 poo uo Innn oo 00000000000000 SD33 TC210 20 d 4 4 lend Eie 202173 104 104 104 104 104 104 104 U202 AT24C16X4050 45201 2 2 C260 C261 B AA XS04 DNS m 102 DNS 102 DNS 3 dl E mem 7 0214 DV33 TC207 220uF 16V 220uF 16V VD202 203 VD119 1N4148 1N4004 DNS 1N4004 DNS
16. 29 130 131 183 25V 105 80 20 Y5V 0805 23 25 115 175 wo jewomarm 1 EXE 1 A mewje jw MICROPHONE HOLDER BOARD 0000148 1 6W200K 5 SHAPED 7 5 R101 0000122 CARBON FILM RESISTOR 1 6W1000 5 SHAPED 7 5 R32 R34 R12 0000287 1 4W3 3K 5 SHAPED 10 0000294 CARBON FILM RESISTOR 1 4W10K 5 SHAPED 10 0000302 CARBON FILM RESISTOR 1 4W51K 5 SHAPED 10 0200307 POLYPROPYLENE CAPACITOR 50v 101 10 SHAPED Sm GROUND CHIP OF POWER 7011 3870115 BOARD AB903 VG2 VG3 LIGHT TOUCH RESTORE 1340003 SWITCH HORIZONTAL 6x 6x 1 K1 K13 MATERIAL CODE MATERIAL NAME SPECIFICATIONS LOCATION p 1980028 5230143 1563896 PCB 6530 4 REMOTE CONEROLLER 0090272 SMD RESISTOR 1 16W10 5 0603 R801 0310048 SMD CAPACITOR 50V 151 5 NPO 0603 C802 C803 0630009 EMISSION PIPE TSAL4400 LED801 SURFACE CASING OF REMOTE 3031118 CONTROL RCO19 01 GREY REMOTE CONTROL BOTTOM 3040813 CASING RCO19 01 GREY BATTEMETAL OXIDE FILM 9030 0 RESISTOR CASE DOOR OF PA 3850063 ANODE SPRING RC019 01 3 3850064 CATHODE SPRING RC019 01 3 3850065 ANODE CATHODE SPRING RC019 01 3 CONDUCT GLUE OF REMOTE 4630900 CONTROL ABS535T RU GLUE BAG FOR 5070809 ENVIRONMENTAL PROTECTION 0277 0 05 SURFACE STICKER OF REMOTE 5155307 rro ABS535T RU 5154411 BOTTOM CASING LABEL ABS530T RU 3070711 ABS535T RU LENS COVER 3070710 ABS535T RU
17. 37 TC30 4 TC308 TC309 perene owes EEE DECODE BOARD SMD R201 R204 R244 R248 R251 R255 R297 R298 R299 R331 R212 R228 R303 R318 O 0090001 SMD RESISTOR 1 16W 00 5 0603 R2165 R2166 R226 R257 R258 R2159 Rr 14 R116 R118 R120 0090006 SMD RESISTOR 1 16W 750 5 0603 R233 R102 R108 0090272 SMD RESISTOR 1 16W10 5 0603 R304 R307 R321 R340 0090003 RESISTOR 1 16W 100 5 0603 R301 R302 MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION 0090005 RESISTOR 0090238 SMD RESISTOR 1 16W 330 5 0603 1 16W 680 5 0603 R232 R256 R261 R263 R264 R268 R292 R296 R231 R265 R267 R2162 R111 R22 0 R113 0090181 SMD RESISTOR 1 16W 1000 5 0603 R291 0090008 SMD RESISTOR 1 16W 2200 5 R121 0090009 SMD RESISTOR 1 16W 3300 5 0603 R110 0090011 SMD RESISTOR 1 16W 4700 5 0603 R325 R327 0090014 SMD RESISTOR 1 16W 1K 5 0603 R213 R215 R254 R109 0090016 SMD RESISTOR 1 16W 1 5 5 0603 R323 R324 R243 0090123 SMD RESISTOR 1 10W 330 5 0805 L202 0090249 SMD RESISTOR 1 16W 5100 5 0603 0090017 RESISTOR 1 16W 2 2 5 0603 0090018 RESISTOR 1 16W 3 3K 5 0603 0090019 RESISTOR 1 16W 4 7K 5 0603 0090023 SMD RESISTOR 0090024 SMD RESISTOR 1 16W 10K 5 0603 1 16W 15K 5 0603 R214 R100 R101 R242 R238 R240 R234 R249 R230 R2140 R11 2 R193 R209 R223 0090025 SMD RESISTOR 1 16W 20K 5 0603 R211 R312 R315
18. 89 the S terminal signal Y C is outputted from the pins 194 and 196 of MT1389 the color difference signal and the R B G signal of VGA port is outputted from the pins 203 202 and 200 of MT1389 the row and field synchronization signals of VGA port are outputted from the pins 207 and 205 of 1389 respectively To mention specifically the alternating line color difference signal the progressive line color difference signal and progressive line R B G signal are outputted from the same pin therefore the signal output shall be selected according to the ports of TV otherwise there will be only sound but without picture display 2 Audio output circuit Audio signals processed by MT1389 output 5 track data signals through pin 217 pin 218 and pin 219 and 5 channel clock signals through pin 214 and pin 215 These signals after passing through IC 74HCT125 are transmitted to audio signal processing IC TAS5508 to be processed specific IC data please refer to Attachment then 10 groups of PWM signals are output six of which are transmitted to power amplifying parts two of which to headphone output and two of which to auxiliary channel output Six groups of signals transmitted to power amplifying IC are processed by surrounding and super DBB sharing an N13 IC TAS5508 and by main sound channel and center sharing an N14 IC TAS5508 Signals are amplified here for they are digital high frequency signals they have high efficiency meanwhile power IC
19. AME SPECIFICATIONS 5230022 SEALING PAPER COLORLESS
20. D laser power drive control with the specific control procedure similar to that of VCD 2 The tray open close control circuit is shown as the Figure III LOAD LOAD TR PEN TRCLOSE MT1389 39 1389 TROPEN 1389 39 Figure III Different from the circuit in former MTK solution the MT1389 is integrated with preposition signal processing circuit so the tray open close control signals are accomplished by MT1389 that is to say the close control signal is accomplished by the Pin 51 of MT1389 while the open control signal by Pin 39 of MT1389 When we press the open button the Pin 51 of MT1389 is in high power level while the Pin 39 is in low power level and then the triode V308 will be on state Through resistor R323 the base of V306 will be made to be in low power level and V306 will be on state with the current direction as the following figure Power voltage V306E C junction motor negative terminal LOAD motor positive Load V308 C E junction grounding So the motor will rotate clockwise to accomplish the action of tray closing When we press the open button the Pin 51 of MT1389 is in low power level while the Pin 39 is in high power level and then the triode V307 will be conducted Through resistor R324 the base of V309 will be made to be in low power level and V309 will be conducted with the current direction as the following figure Power voltage V309E C junction 2 motor nega
21. L 3 3V 1389 SDA and SCL are short voltage is right circuit to grounding if R259 and R260 are in working order Check if SDRAM CLK CS RAS CAS Check if FLASH ROM URST DCE WE communication signals are right DRD DWR signals are right Check if the connection between MT1389 FLASH SDRAM is right Check if the MT1389 SDRAM and FLASH are damaged Do not read disc Check if the Check if the feed control connection from Check if the laser input of 5954 Pin 23 is BA5954 to MT1389 head has feed action 1 4V is open circuit Check if BA5954 pin 17 18 Check feed motor have 2 5V voltage output and its connection Check if BA5854 and the power supply 5V are in working order Check if BA5954 pin 1 Check if the Check if laser head has focus control connection from has focus action voltage input of 1 4V BA5954 to MT1389 is open circuit Check if the voltage output of ENEE teeny goil ad 5954 pin 13 and 14 are connection 2 5V Check if BA5854 and 5V power supply are in working order Check if there is Check if the signal Check MT1389 and its laser coming out voltage of LDO1 LDO2 connection from laser head is 3 2V Check if V301 and V302 electron collector voltage is Check if the laser head 2 3V7 and its array line are right Check if the control Check if the connection from voltage of BA5954 pin 5 5954 to MT1389 is open main shaft is 1 4V circuit Check if the mai
22. LENS COVER 4000120 SELF TAPPING SCREW 5446917 SEMI FINISHED PRODUCT 2250180 FLAT CABLE CORD DIGITAL RECEIVE TUNER 8 GRAPHEMIC POWER SUPPLY SOCKET 1020037 2250177 1350066 1710038 1870041 MATERIAL CODE 2121324 2121668 5233636 2140116 2250144 2380245 2380245 3022336 3025710 3025718 3070712 3029130 3060222 3060240 3060241 3101945 3100792 3871507 3870610 3871532 3871533 5234130 4000515 4000452 4000453 4000462 4000463 4000618 4040051 4210169 4330026 5233093 5233125 5233126 MATERIAL NAME SPECIFICATIONS SOFT FLAT CABLE 6P180 2 0 2 PIN THE SAME DIRECTION FLAT CABLE 5P140 2 0 2 SAME DIRECTION ABS535T RU LENS COVER DJ 214 WITH 150mm INSIDE BLACK PAPER DUCT AND 4660086 INVERTED TUBE NET CLOTH 5233946 PVC PEEL SF00859 HLPC 5233951 PVC PEEL P21010 01 5233947 RUBBER FEMALE CLASP DK 009 BLACK PLASTIC BAG FOR ENVIRONMENTAL PROTECTION 7032 195x 260 x 0 023 P 9070320 WITH WARNING WORDS PE 5070322 SELF SEALED GLUE BAG WORNING 230x 335 PEARL COTTON BAG FOR ENVIRONMENTAL 7111 PROTECTION WITH HOLE MATERIAL CODE MATERIAL NAME SPECIFICATIONS ENGLISHFUSSA mme om mme feewewe Ta me pese sem eem ES L EE 0 0 MATERIAL CODE MATERIAL N
23. Principle and Maintenance of ABS535T CONTENTS Chapter I Overview of ABS535T Description of Functions 2 Block Diagram of Player 30 Composition of IC for Player Chapter II Operating Principle of Servo Circuit 1 Processing Procedure of Digital Signal 2 Processing Procedure of Control Signal Chapter III Operating Principle of Decoding Circuit 10 Control Circuit of System 2 Audio and Video Output Circuit Chapter IV Operating Principle of Power Board 1 Block Diagram 2 Operating Principle of Circuits Chapter V Operating Principle of Panel 1 Operating Principle Chapter VI Troubleshooting Appendix Functions of IC Pins Important prompt This type player employs two kinds of decks SF HD62 and SF HD60 and corresponding software of these two types of decks are different therefore please pay special attention during deck changing in the maintenance Corresponding decks should be changed with the same type of original ones otherwise the player will be out of order Identification of decks is shown as figures Operating Principle Analysis of ABS535T Chapter I Overview of ABS535T ABSS53ST is a medium low grade model integrating with video disc and power amplifier with the following major features 1 The layer adopts Sanyo loader MT1389 solution 2 The power amplifier adopts the digital power amplification circuit with the power IC of TAS5112DFD it has low distortion level The audio
24. R316 0090188 SMD RESISTOR 1 16W 18K 5 0603 R210 0090197 SMD RESISTOR 1 16W 150K 5 0603 R319 R320 1 16W 680K 1 0603 1 16W 750K 1 0603 1 16W 100K 5 0603 1 10W 4 70 5 0805 R317 R322 R227 R224 R308 R310 R246 R122 R208 R252 R309 R311 R313 R314 R339 R2164 R328 R329 R259 R260 L206 0310085 SMD CAPACITOR 50V 20P 5 NPO 0603 222 114 119 186 187 0310190 SMD CAPACITOR 50V 27 5 NPO 0603 C275 C276 0310045 SMD CAPACITOR 50V 47 5 NPO 0603 263 266 101 112 0310051 SMD CAPACITOR 50V 331 5 NPO 0603 C212 C213 0310048 SMD CAPACITOR 0310084 SMD CAPACITOR 50V 151 5 NPO 0603 50V 104 80 20 0603 C304 C306 207 211 214 216 217 224 226 231 234 239 241 254 256 25 9 267 270 274 279 281 301 3 03 C305 C309 C31 1 C312 C2160 C2162 2163 2167 2168 2170 2171 2173 C2175 C277 C343 C345 C280 C100 C1 13 0125 MATERIAL MATERIAL NAME SPECIFICATIONS LOCATION 207 211 214 216 217 224 226 231 234 239 241 254 256 25 9 267 270 274 279 281 301 3 0310058 SMD CAPACITOR 25V 104 80 20 0603 03 C305 C309 C31 1 C312 C2160 C2162 2163 2167 2168 2170 2171 2173 2175 277 6343 45 280 100 1 13 125 0390096 SMD INDUCTOR 1 8UH 10 1608 L100 L105 L309 L228 L236 L230 L233 L301 L305 L 307 L310 L312 L314 L316 L317 L319 L32 0 L304 L308 L318 L322 L324 L31
25. Reset 1 0205 HC U04 8 pins around 5V 2 MT1389 110 pins around 5V 3 FLAHS ROM 12 pins around 5V Clock 27MHZ crystal oscillator two ends Around 0 77 C bus SDA 3 3V PC bus SCL 3 3V Servo circuit 10010 3 3V LDO2 3 3V V301 and V302 electron collector LD voltage 2 3V 5954 pin 4 base voltage 1 4V 5954 pins 15 and 16 tracking drive output Around 2 5V BA5954 pins 17 and 18 feed drive output Around 2 5 V 5954 pins 13 and 14 focus drive signal output Around 2 5V 5954 pins 11 and 12 main shaft drive output Around 2 5V 5954 pin 1 focus control signal input 1 4V 5954 pin 5 main shaft control signal input 1 4V 5954 pin 26 tracking control signal input 1 4V 5954 pin 23 feed control signal input 1 4 V Amplifier circuit TAS5508 pin 9 power supply pin 3 3V 55112 321 330 400 410 440 45 520 53 28V V II Troubleshooting of main troubles No picture no sound no VFD display Check if power supply of MT1389 33V 1 8V is right and check if the decoding board is Check the voltage of power board short circuit to the grounding Check if clock oscillating circuit 27M crystal oscillator C275 C276 R224 R248 are damaged If the clock signal output XO and XI is right Check if the reset circuit which comprised by HCUO4 and Q204 etc Check if reset signal URST is is in working order in 5V high level Check if the AT24C16 CS4360 Check if I2C bus SDA SC
26. TEZISLV OP S 10K Es E TROPEN SK TRO lis 153pF 330pF VIP4 USBVDD 1 212 ADIN 89V33 104 330pF TROUT TDI TRIN IMS STBY TK TRCLOSE TDO V18 T 39 40 42 29 50 52 PM CSORFOP RFLVL RFON SGND V2REFO v20 VREFO FEO TEO TEZISLV OP OUT OP INN OP INP DMO TROPENPWM PWMOUTI V ADIN9 TRO FOO USB VSS USBP USBM USB VDD3 FG V_ADIN8 TDI V_ADIN4 TMS V_ADIN5 TCK V_ADIN6 TDO V_ADIN7 DVDDI8 RDI6 RDI7 RDIS RDI9 RD20 RD21 DVDD3 RD22 RD23 DQM2 DQM3 RD24 RD25 DVSS RD26 DVDDI8 RD27 RD28 RD29 RD30 RD31 ASDATAS RDSSYNC MOE 2 53 2 C309 22 IOA4 A5 IOAS A6 10A6 AT 10A7 AS HIGHAO 320 C308 93 o HL C346 an IOA19 150K DN XS05 5 DVSS Ci Emmm APLLCAP L 0 2515 APLLVSS 1 500 a 5 1500pF cauzgnaz E R E BEBES ES 28 CONST SER DAS 2535955558 ce ok 8835 83 53 52 3883 23 7 C249 ke lt cco TATI Pas TC308 104 104 104 104 7104 104 T104 47uF 16V NOY TC248 dt V309 4TuF 16V 33A V306 8550 8550 V307 THe 22175 B 8050 Sl R325 5 CIRCLOSED 8525 TROPENI TRCLOSE ATT mm ABS535T 1389 SANYO 39 TROPEN PWR R297 OR DWRE To TER pa F R OR DRDE 0000000 0120 030 000 _ 000000000000040 XC101A 1
27. an IC of analog digital conversion it can be applied to sample analog to digital conversion and filter During continuous input its sampling frequency can be up to 200KHz Its main features are as follows 24 bytes conversion supported audio frequency can be up to 192KHz under power of 5V its dynamic range can be up to 101DB it has high pass filter to filter direct current Functions of its pins are as follows Digital power Digital power Z C223 20 1000F R227 750K V305 3904 S 1203 DACYDD3 FB TC201 10uF 16V 17 104 220uF 16V wall al V303 V304 100K avec 2 T A XS301 2SK3018 S 2SK3018 S 24P0 5mm 208 35 206 C301 TC301 104 220uE 16V LPFON PLLVDD3 IDACEXLP SPMCLK HSYNC V_ADIN2 Y VUVI ASDATAS VSYNC V ADINI YUVI Y DACVSSC YUV3 CVBS L309 LDO AV33 FB B 52 RES Ro OR HBSMT SL SL C302 e 04 GND TCX TMSO_47uF716V R312 C304 D cs VOTK VOTK VOLD VOLD PGND VNFTK Pc PREGND VINLD CTK2 VINTK BIAS SIBY U302 5954 TC302 4TuF 16V LDO2 301 2581132 8 V302 2881132 5 LDOI TC303 ay 47 R32 LDO AV33 10R C243 104 VIP4 R307 R201 R202 R203 R204 TC206 47uF 16V R228 OR MDIL fo fo fis fo lo fol fo pe ol C204 47uF 16
28. control command is sent to the IC D16311 through keyboard scanning circuit and through internal decoding drive the IC D16311 outputs the control data from the pins 5 and 6 to the built in CPU of MT1389 which will realize the control on the controlled circuit and control the VFD through IC D16311 VFDA01 i s a vacuunf uorescence screen andi ts bi ggest featureis its hi gh bri ghtness Its operation principle is similar to the kinescope of TV The pins 1 2 34 and 35 are for filament power supply the pins 27 32 are GRID poles each GRID has 16 different characters of display the pins 4 19 are SEG poles and the CPU control the SEG poles through its control on IC D16311 and display the characters of corresponding operation status on the screen The remote reception circuit mainly consists of remote receptors HS0038A2 of which the pin 1 is for grounding the pin 2 for power supply the pin 3 for output of reception signal and they are all connected directly to the CPU in MT1389 to control the corresponding circuit This player has headphone output function A pin in the headphone directly connects to TAS5508 When the headphone is inserted detection line HDET grounds and turns into low level When pin 12 of TAS5508 turns into low level parts of output of amplifier are muted When in normal condition this detection pin is of high level around 3 3V Troubleshooting I Voltage on key points of ABS535T Demoding circuit
29. has low colorific value Amplified signals are still digital signals in order that they can be output through loudspeaker amplified digital signals still have to be processed before outputting For PWM signals containing audio signals since high frequency signals have high frequency and are beyond audibility range of human ears we can ignore impacts of high frequency signals and reduce low frequency audio signals only during processing 55508 is an 8 channel pulse width modulated high performance and applicable in processing most digital audio signals Between 20Hz and 20KHz it has excellent noise factor and dynamic range It has following features Automatically control clock speed and digital sampling speed 2 8 groups of audio input channels 3 8 groups of PWM output can be changed into 6 channel stereo line output or 8 channel line output A Line output is a different input open loop amplifier driven by a group of PWM signals IC TAS5112 is a high performance audio power amplifier Bridging with 60 loading each channel can output 50W It has 95DB dynamic range low distortion degree and low rate of heat generation with power efficiency up to 90 It also has functions of low voltage protection high temperature protection overflow protection etc At the same time it has built in driving power adjustment gate circuit It is applicable in family video DVD receiver mini music center etc Detailed IC introduction
30. isc when opening the player III Servo drive circuit The servo drive of the player is accomplished through a piece of 4 channel dedicated drive circuit BA5954 with the circuit as Figure V The 4 servo control signals generated in digital servo circuit processing of MT1389 i e focusing control FOSO tracking control TRSO feed control FMSO and main shaft control DMSO signals are added to the pins 1 26 23 and 5 of BA5954 respectively and after drive amplification of 5954 the focusing and tracking drive signals will be outputted from the pins 13 and 14 and pins 15 and 16 of 5954 respectively and added to the focusing and tracking coils to drive the light head to accomplish the actions of focusing and tracking The feed and main shaft drive signals will be outputted from the pins 17 and 18 and pins 11 and 12 of 5954 respectively and added to the feed motor and main shaft motor to drive the light head to move longitudinally and enable the disc to rotate in constant linear speed 42 41 26 MT1389 BA5954 38 23 37 50 Figure 5 The STBY on Pin 28 of 5954 is an output enabling signal and only when the pin is in high power level there will be output of drive voltage on the output terminal Chapter III Operating Principle of Decoding Circuit The decoding circuit of the player mainly consists of decoding chips including MT1389 SDRAM AE45164016 and FLASH ROM 29LV160BE and audio DAC CS4360 I Control
31. n shaft rotates Check if BA5954 or main shaft Check if BA5954 pin 11 motor is damaged and 12 output is 2 5V Check if 1389 and its peripheral Check if BA5854 and 5V power circuit is right supply are in working order Attachment Brief Introduction to IC Pins I MT1389 MT1389 adopts the LOFP 256 pin packaging and 3 3V 1 8V double voltage operation mode It is a piece of large scale CD ROM and DVD ROM preposition processing CMOS integrated circuit with excellent performance and a single chip dedicated to CD VCD DVD player It contains focusing servo error amplification tracking servo error amplification and RF level output servo control including the following main functions RF small signal preposition processing mainly for carrying our corresponding processing and amplification on the RF signals transmitted from the light head part adjusting the laser output power automatically and identifying the VCD disc and DVD disc Digital servo processing can generate focusing tracking feed and main shaft servo control signals digital signal processing accomplishing the EFM EFM demodulating of RF signab MPEG 1 MPEG 2 MPEG4 JPEG Video decoding chip which can not only realize the decoding of VCD and DVD but also realize MPEG 4 network video decoding being compatible to network movie disc and decipher JPED pictures to realize the function of digital photo album play On audio aspect it can not only realize AC
32. ntroller address bit 20 Loo IOCS FLASH chip selection Digital 3 3V power supply E z IOA21 ADINO universal input AD FLASH address bit 17 Micro controller address data bit 7 0 Micro controller address bit O E 7 7 R D L 1 UW R Micro processor correction mode enabling Micro processor reading operation U Micro processor reading operation UP3 0 Micro processor port 1 1 1 1 1 ICE 1 Remote control signal input 76 77 78 19 91 92 93 95 04 05 06 07 09 10 11 INTO Micro processor interruption 0 EE E e RD13 ASDATAS DRAM data audio series data RD27 30 DRAM data RD26 DRAM data E E DACVSSC D A conversion grounding YUV1 Y Video signal YUV1 output Y signal output DACVDDB D A conversion 3 3V power supply YUV2 C Video signal YUV2 output C signal output DACVSSB D A conversion grounding YUV3 CVBS Video signal YUV3 output CVBS signal output YUVA G Video signal YUV4 output G signal output DACVSSA D A conversion grounding Video signal YUVS output B signal output TUV5 B YUV6 R Video signal YUV6 output R signal output VSYNC ADINI Field synchronization signal output AD universal input YUV7 ASDATAS Video signal YUV7 output audio series data HSYNC ADIN2 Row synchronization output AD universal input SPMCLK DACVDDA D A conversion 3 3V power supply SPLRCK SPBCK ASDATAS 210
33. of low voltage protection high temperature protection overflow protection etc At the same time it has built in driving power adjustment gate circuit Basic functions of its pins are as shown in the following 16 DREG Digital service voltage adjustment EN circuit DVDD 1 2 22 24 28 GND Grounding 29 27 36 37 480 49 56 Driving voltage adjustment of gate 30 55 Digital voltage adjustment G G MI TSTO Mode selection M 15 14 1 pp 4 Protective pin in the high temperature 38 39 OUT B Output pin B 46 47 OUT C Output pin C Inverted input pin s ______ Inverted input pin PWM DP Non inverted input pin REG VDD 2 TW M AM M AP M BM M BP _DM RESET AB Reset signal valid in low level 9 RESET CD Reset signal valid in low level 6 SD_AB Signal switch off control SD CD Signal switch off control IC SE5532 IC SE5532 is an amplified IC with dual channels and low noise Compared to most other amplified ICs it has lower noise better output performance and power bandwidth Its main features are small signal bandwidth its direct voltage gain can be up to 50000 and alternating voltage gain can be up to 2200 under 10KHz its power bandwidth can be up to 140KHz relatively larger power supply range fast slewing rate Basic functions of its pins are as shown in the following table OUTPUT CS 5340 CS 5340 is
34. or correction deck and MTK decoding solution and its servo circuit mainly consists of preposition signal processing digital servo processing digital signal processing IC MT1389 and driver circuit BA5954 MT1389 is also a main part of the decoding circuit The A B D E SA SB and RFO signal transmitted from the deck are mainly inputted through the 2 13 pins of MT1389 and after amplifying treatment of built in amplifier ofMT 1389 the signals are treated in two parts within MT1389 After being processed by the internal digital servo signal circuit of MT1389 part of the signal forms into corresponding servo control signal and output focus FOSO tracking TRSO main shaft DMSO and feed FMSO servo control signal from the P42 P41 P37 and P38 of MT1389 and send them to the driver circuit BA5954 to amplify the drive After drive amplification the signals will drive the focus coil tracking coil main shaft motor and fed motor The focus and tracking servos will be used to adjust the object lens and enable laser beam to identify signal from compact disc correctly the feed servo will be used to drive the laser head to move longitudinally and scan the compact disc the main shaft servo is used to control the main shaft motor to read the signals in constant linear speed and drive the disc to rotate After being processed by the internal VGA voltage controlled amplifier of MT1389 in amplification and balance frequency compensation ano
35. photoelectric coupling through HS817 to reduce on time of internal switch tube And thus it reduces transformer coupling and decreases output of 3 3V voltage to achieve automatic adjustment and control and vice verse It has to be noted that in this switching power reference voltage comparator IC of two groups of switching power are different For voltage of the group supplying power for amplifier is higher it adopts LM431 which has better performance and higher withstand voltage And voltage of the group supplying power for 3 3V is lower it adopts 17431 For two ICs are different you should pay special attention to distinguish them from each other They cannot be used mixing Chapter 5 Panel control and VFD display circuit The panel mainly consists of VFD screen driver ICD16311 remote receptor 50038 2 and button and indicator display circuit mainly for accomplishing man player dialogue and display of operation status The structural drawing is as follows Keystroke control VFD display inm Panel indicator control Remote receiving Figure XI MT1389 will control the U401 IC D16311 to display the operation status of the player through the VFDST status VFDCK clock and VFDAT data under the control of CPU built in MT1389 receive the user control commands sent by D16311 and control the controlled circuit of the player to limit the player to operate in specified status When the user operates the panel buttons the
36. see Attachment When in normal disc reading digital signals and clock signals from 1389 are transmitted to pin 26 to pin 31 of IC TAS5508 through IC 74 125 gating If no headphone is inserted PH SEL is of high level as well as when MUTE is normal And pin 37 of TAS5508 is also of high level All data lines and clock lines can be detected by oscilloscope One group of signals from 5508 is transmitted to N8 and then output through auxiliary channel Another group is transmitted to headphone other PWM signals are transmitted to amplifying parts of amplifier When headphone is inserted PH SEL signal is forcibly shorted to earth and turns to low level meanwhile amplifier is muted This amplifier has functions of radio reception auxiliary channel output and karaoke All external inputs after N3 CD4052 gating and N7 CS5340 analog to digital conversion are transmitted to MT1389 Rear processing and output is the same as the signal output flow in normal disc reading When in disc reading system defaults to gate karaoke input therefore you can open karaoke when playing disc This amplifier also has automatic accompaniment function when playing VCD system detects external input and automatically screen to human sound signal in the disc while only saves sound accompaniment ABS535T has the function of radio reception and can also receive RDS signal The radio head control lines CE DI CL and DO are controlled by 28 array lines connecting to
37. ther part of the signals is converted into digital signal by the internal A D converter When the deck reads the CD VCD signals these signals will be EFM demodulated in MT1389 and after accomplishing CIRC error regulation in internal MT1389 output to the next grade to carry out audio and video decoding when the deck reads the DVD signals these signals will be ESM demodulated in MT1389 and after accomplishing RSPC error regulation in internal MT1389 output to the next grade to carry out audio and video decoding II Processing Procedure of Control Signal 1 Automatic control of laser power with the circuit shown as the Figure II MDI1 2D 21 MT1388 Figure II MT1389 is integrated with APC automatic light power control circuit Its Pin 20 is the pin for inputting VCD laser power rate detection signal the Pin 21 is the pin for inputting DVD laser power rate detection signal and the Pin 23 is the pin for outputting VCD laser power rate drive control When the Pin 23 finds that the laser output power rate is too strong the output voltage on Pin 23 will increase after the processing of internal circuit of MT1389 and then the conduction degree of V302 2581132 and the voltage on its integration polar will decrease which consequently lead to the decrease of voltage supplied to the laser tube the weakening of laser head lighting and thus achieve the automatic adjustment on laser output power The Pin 22 is the pin for outputting DV
38. tive terminal LOAD motor positive Load V307 C E junction grounding So the motor will rotate antrclockwise to accomplish the action of tray opening 3 The main shaft motor braking circuit is as the Figure IV To prolong the lifespan of motor and reduce the influence of start up impact current with the installation of disc our R amp D personnel design the main shaft motor to be in the state of constant operation so that even if the STOP button is pressed the disc will not be stopped Therefore when we press the OPEN button a braking signal is required to stop the rotation of main shaft motor immediately to accomplish the opening action in a short time C30T7T R317 giu Figure IV During playing if we press the OPEN button the main shaft drive signal will disappear and because of inertia the main shaft motor is still in operation As the electromotive force generated in the operation of motor receives the induction voltage on sampling resistors R321 and R340 which through the resistor R319 and R320 is added to the Pin 36 and Pin 35 of MT1389 and outputted from the Pin 34 after internal processing for amplification in MT1389 and delivered to Pin 47 of MT1389 through R318 After the internal A D conversion and corresponding processing an instant motor reversal braking signal will be outputted from the Pin 37 of 1389 to stop the rotation of main shaft motor immediately so as to ensure the standstill of the d
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