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service manual AV225T

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1. Display 4 Default When the system parameters adjusted disorderly you may restore the default settings Press the DEFAULT button on the remote control to display DEFAULT The unit automatically sets the default parameters DEFAULT O Default Chapter Three Principle and Servicing Section One Principle ofthe Player AV225T RU is an advanced power amplifier with complete functions Based on the former power amplifiers it adopts LCD screen with sky blue background matched with 16 different kinds of spectrum display styles in addition this player is with tuning function and it is an excellent selection for users who love listening to radio 3 1 1 Composition of the player 1 Volume board select input signal source Cyber Logic and bass enhancer control 2 Signal processing board Karaoke signal processing and 5 1CH signal amplifying 3 MCU board player control frequency point gating and auto search circuit 4 Control panel LCD display remote keyboard and background light display 5 Power board supply the working voltage required by each unit circuit and perform player protection function 6 Power amplifier board perform power amplifying to 5 1CH analog signal 7 Digital tuner receive radio signal and then send to power amplifier for signal processing 8 MIC headphone board MIC signal input headphone amplify
2. 60 61 jg 5 8 iinell o sas ee 62 ee 65 3 5 8 function introduction to Pt2222 66 3 5 9 function introduction to Lm1875 E E ee u maw da E re ee ee eee a usu EE 67 3 5 40 introduction to 26 s u ee ee er eee ee 68 3 5 11 function introduction to M62446 69 3 5 12 function introduction to AT24CO2 70 7 71 a function TO T012 s s sscsssshkastassesassaqasateqsnasasstapsssyskassqhespasqasaaraaqhaphohasaakas 72 S P e ee ee 72 a6 16 function ____________________ 73 Ga ee 74 2 48fmchenIniraducton to Z4 VE Oe 75 77 Chapter Four Disassembly and Assembly Process e 79 Chapter Cinque PCB board Circuit diagram eee 87 ee 87 Section Two circuit diagram eene eene 96 Gaye LO LIII ee 105 105 6 2 board 105 6 3 Signal disposal board 106 6 4 Signal disposal board aisegment eee 108 6 5 Cpu oard ME E 110 0o Cpu board 111 6 7 Amplifier board meme eene 112 6 8 Surface cont
3. tee me Em nes 3 5 12 function introduction to AT24C02 1 Description The AT24C02 provides 2048 bits of serial electrically erasable and programmable read only memory EEPROM organized as 256 words o f 8 bits each The device is optimized for use in many industrial and commercial applications where low power and low voltage operations are essential The AT24C02 is available in space saving 8 lead PDIP 8 lead MAP 8 lead TSSOP and 8 ball dBGA2 packages and is accessed via a 2 wire serial interface In addition the entire family is available in 2 7V 2 7V to 5 5V and 1 8V 1 8V to 5 5V versions 2 Features Low voltage and Standard voltage Operation 2 7 2 7V to 5 5V 2705 1 8 VCC 1 8V to 5 5V Internally Organized 256 x 8 2K 2 wire Serial Interface Schmitt Trigger Filtered Inputs for Noise Suppression Bi directional Data Transfer Protocol 100 kHz 1 8V and 400 kHz 2 5V 2 7V 5V Compatibility Write Protect Pin for Hardware Data Protection 8 byte Page 1K 2K Write Modes Partial Page Writes are Allowed self timed Write Cycle 5 ms max High reliability Endurance 1 Million Write Cycles Data Retention 100 Years Automotive Grade Extended Temperature and Lead F
4. D SO M OX OO 5 5 ete etel S S QUOI DO t DO SUR SU ettet 09628 9 o X52050 OU to te S 56 D 5 BOO 9 v 525 300 EX Neate 59524505055 0 WE O D OOO Soo 299290005009 2 7 OVER rere det 5 95 96 XC101 VCD 2 VCD R103 22 3 R101 100 DVD DVD 4 R102 100 108 22 3 5 p Bj e 6 R1 100 AV3 i CON6 PME UM 220u 16V NZ 5V 100u 16V C102 po R106 C108 C101 TC104 22K 103 103 220u 16V 103 NI 99PIA c s OA J 9 TUNER R 8153 Rt54 155 8156 j 8 22K 22K 22K 22K SS L101 100uH XCIOIA 3 8 i 101 101 101 115 101 6 2 5 36 C138 DVD 2 S E 3 ore 5 m E 4 C136 su m EN C133 30 59 6 8 47n L 4 36 0180 47uA6V pz 15 28 XC102B 47416 um 27 16 C129 4 7416 17 19 ES R124 1 K 47u16V VD112 R177 9 1V 47016 77 XS20 150 C144 C1
5. V112 2501047 R128 43K R126 R129 10u 16V V102 PES 27K R111 8114 R104 C104 33K05W 47K 2200 V106 2N5551 8115 12K i 25 R130 kaws 1N4148 43K R110 V113 510 103 2SB817C 1N4148 P 30V 22005W C113 474100 R147 P 30V V127 2K WI 25510470 R158 Biss 8156 bs 1000 25W d R144 V121 2N5551 R145 Citi K 10u 16V 2N5551 R134 C114 47K 220p 8137 12K per 0257W 119 2N5551 43K V128 C117 Z so 106 2SB817C 1N4148 P 30V R172 C128 5 C126 47 gt 4 n 24 VNV151 N x 879014 155 47 TDA7265 24K C156 47 16V 100U FL102 T6 3AL250V T6 3AL250V peog mod opne 9 7 COL C100 VD100 WE VD101 1N5404 N SWITCH FL101 VD102 5 T6 3AL250V From TRANS 4N5404 103 2501 L C108 8200u 63V C106 i TO TRANS 0 1N5404 bs V1 3 VD104 V RLY 4 0 22u VD105 8200u 63V 0 1u EON FL102 1N5404 Q T8AL250V VD106 i C123 IN 103 D113 R100 220u 35V VD110 9404 1 1122 C112 1N4004 47 3W IN4148 R102 C122 103 1 m R106 R108 4 7K 100K lt OVER R107 P_RC 1 RLY0 1K 100K IN4148 E SWM jc C126 VD111 103 5 1V R110 pum 4 V
6. 10 d 2 Ww Wy Tuning v Select other frequency radio stations downwards BAND Select FM AM tuner BAND PRESET Select the latter preset radio station PRESET4 Select the previous preset radio station MODE Select tuner mode manual auto MASTER VOLUME Press this button to synchronously increase all 6CH volumes STANDBY Standby COVER OF PHONE JACKAND MICROPHONE JACK 2 1 2 REARPANELILLUSTRATION AC 3 DTS 5 4 INPUT 5 1 audio signals input terminals that connect to DVD AC 3 DTS AM FM antenna terminal Connect AM FM antenna outside Stereo Audio jack The terminals that connect with VCD DVD stereo audio signals input Video input The terminals that connect with VCD DVD Video signals input Video output jack The terminals that connect with TV Video signal output 9 Data The data plate ofthis unit SERIAL NO Mark The manufacturing records CAUTION mark Remind the user of dangerous voltage inside Line out Subwoofer signals line out jack This unit s manufacturer Terminals Connect with SPEAKER terminals 2 1 3 ILLUSTRATIONS TO REMOTE CONTROL STANDBY button Power on STANDBY switch button DISPLAY button Select audio spectrum display modes MUTE button Mute On Off button INPUT button Select input signal sources manually MOVIE button OTP button to setstandard movie theat
7. 12V C105 47 C106 47 E em lt NI R140 12K 4558 C114 11 5 47u 16V 3 R151 22K C132 10u 6V 47 R111 47K R134 22K R124 12K R108 47K C R112 4 7K Wine R108 7 5K 4558 DIST XS25 0202 47u l6V N200 PT2315 HEADPHONE 1004 16 219 10416 C217 10416 3 9n 8247 39K 12V GND GND R211 R242 MCDET 4 C205 COM 47 16 R253 10K V201 9014 C245 47u16V C231 OKL C240 681 CKD L i 047uA6V R244 246 R210 R202 150K 20K C246 47 16 OK R HEADPHONE 12V i d 1 L 174094 DATA 248 47416 R21 12K R284 22K x R236 510 6 8V C215 10u 16V C216 C247 70 622 10K 10u 46V C242 47K gt 47 R58 5 R268 10K 47u 16V 108 56K 6 R267 10K Gas R224 10K EI VD202 12V 12V 51V R232 15K R225 10K R226 15K C243 108 C232 L 47416 N204B 10K 4558 R229 100K 101 R131 10K R133 1K eL 4 22u16V 10K 116 NB 100K S8050 47K 7 235401 ae R170 R168 C122 820 A 22u 16V 10K 22u 16V T 10K RNV oa 3 3V 47K 2014 22u 16V C103 47u00V R117
8. 6 8 pn RIN CL1 en R134 R135 R136 x C132 150 150 150 GNDL ea 47u 16V GRI D 1 16 lt li 7 BYPASL 4 7u 16 R159 C123 CR2 C12 1s LTRE RTRE 100K LBASS3 RBASS3 532 C127 i 15n 15n LBASS2 RBASS2 C12 6126 0 0 33 LBASS1 RBASS1 22 Figure 3 3 1 2 Volume circuit diagram Note when there is no output firstly make sure whether signal input can be detected ifsignal input can be correctly detected it means that signal source conversion circuit has problem then make sure whether it is a certain channel has no output or all have no output if all have no output it is probably that power supply of certain part is abnormal also it is mute signal that abnormal etc For Cd4052 and Cd4053 belong to the electronic switch with high conversion frequency they are easy to be damaged after being damaged 6 8V and 6 8V voltage may probably be pulled down or gating signal A B of 62446 will be pulled down and then troubles such as signal not detected and no output will appear Instance 31 Symmtom output Description after power on connect to 5 1CH main channel has no output central and surround have output power board FL101 FL102 fuse is burnt down Analysis and troubleshooting change fuse of FL101 FL102 and power on again Fuse is burnt down power off test resistance to ground of power board
9. A DOO 5 ets 50 i Y 9 C 1696059504 5 6050 7 9 9 9 sts Y 557 ets 5 4592575 56 e 66 22 DO o tet etre ttg KY 52656260564 QUOQOE e OPA RP OT e R x3 DOC N 5 CS e ON OO 94 OO 9 9 SON 005 E ete OO SK ORIS 59 stet ete AS 50 te 3 9 OO o 27 2 o 4 44 te 205 076 ae 5 GR ON ue ste e 525 us MODE i500 29 42 SOC 5 stt m INS ttt OONM Mete 5 DECR 5 9 Prime CN RESON 5 062 MESS Qu pw S wv 2 UP 9 lt 2 550 SOR SON S600 QU OS 4 4 Se NS OX 6 o 5600 No te OQ OQ G O 9 IONS QS RECO gt 9
10. R104 4 7 10K VD108 OVER 4 R101 SIBI 100 RC 3 RLY0 2 SWM 4 b C128 CON4 is C113 E 4 R111 C1160 1u 00 9906 R112 4 7 1W 0 C1170 1u ER 9006 L2 1 R113 R I C2 3 Cc4480 1u SL2 4 SR2 5 R114 6 HVC one 47AW vc 9 H VC R115 C CONS 4 71W C1200 1u 1N4148 Figure 3 3 1 1 Protection circuit diagram Note 1 After relay being used for a period working state may be unstable and some abnormalities will appear For instance relay not attracting after power on sometimes each contact point not fully contacted after relay attracting CPU not detect RLY0 signal this signal is low level afterrelay attracting auto protection 36 2 Power on protection causes over current protection over current protection and CPU not detect RLY0 signal test whether each output channel has DC output when power on protection trouble appears make clear which kind of reason caused this The common protection is that abnormal centre or surround power IC causes that output signal has DC Instance 2 Symptom no sound output Description system not detect signal after power on no output when switching various sound sources Analysis and troubleshooting select VCD channel after power on input sine wave signal shown as in the figure 3 3 1 2 test volume board capac
11. 2 Internal short circuit current limiting Output current in excess of 1 Metal Fin is fully covered with Mold Resin 3 PIN DESCRIPTION o9 m 3 5 16 function introduction to LM324 1 Description The LM124 series consists of four independent high gain internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage Application areas include transducer amplifiers DC gain blocks and all the conventional op amp circuits which now can be more easily implemented in single power supply systems For example the LM124 series can be directly operated off of the standard a 5 V power supply voltage which is used in digital systems and will easily provide the required interface electronics without requiring the additional g15V power supplies 2 Features Internally frequency compensated for unity gain Large DC voltage gain 100 dB Wide bandwidth unity gain 1 MHz temperature compensated Wide power supply range Single supply to 32V or dual supplies 1 5V to 16V Very low supply current drain 700 un A essentially independent of supply voltage Low input biasing current 45 temperature compensated Low input offset voltage 2 mV and
12. 82 18 Take hold ofpanel by righthand fasten thebottom casingD with4 fingers ofleft hand holdthe panel button bracket C with thumb andexert strength towards direction ofarrow C untilpanel comes off from bottom casing claspB then exertstrength towards direction of arrowC left side panel falls off from bottom casing andthen right hand panel clasp falls off from bottom casing automatically 20 PCB boardhas been takenaway 9 2 Take hold components andexert strength towards arrow direction inward until theclasp is f astened BEL nn Bg enm Loo 3 Use electricscrewdriver to fixscrews in twosides of 4 Use electric screwdriver to fixscrews A Ein the joint surface casing place of surfacecasing and bottom casing N Y 5 Install powerboard and then Use electric screwdriverto 6 Use electricscrewdriver to fixscrews of powerboard fix screws A D in thejoint place ofrear cover and output and insert flatcable A D to properposition terminal of poweramplifying output board power board and power amplifying output board areboth in one miM 2 _ I G t 2 1 i Ur 4 I 7 Install poweramplifier board anduse electric 8 Use electricscrewdriver to fixscrews A B C ofpower screwdriver to fixscrews A Din the jointplace of amplifier board a
13. A Standard under the control of the player MCU when bass enhancer is off left channel right channel and subwoofer have output when bass enhanceris on only leftand right channels have output B Hi Fi under the control of MCU only left and right channels of M62446 have output when bass enhancer is off volume adjustment is off C Cyber logic pin 9 10 of electronic switch N101 CD4052 selecta group of analog left and right channel input signals according to the truth value table the left and right channel signals are outputted from pin 3 13 through the electronic switch inside N101 and divided into 2 ways one way is sent to pin 13 15 of M62446 for electronic volume and tone adjustment and the other way gets SW S SR S SL and S C signals though buffer and adder and subtracter in which S C S SR and S SL signals are sent to pin 12 2 5 of N102 under the control of 5 1CH signal N102 selects Cyber logic signal input see Cd4053 truth value table from Cyber logic and 5 1CH signal central right surround and left surround signals are outputted from pin 14 15 and 4 respectively and then sent to pin 11 8 and 9 of M62446 for volume adjustment Another SW signal is outputted from N107A and then sent to pin 6 of M62446 5 1CH signal sen tto M62446 outputs from pin 31 36 after volume adjustment and then is outputted by XS20 flat cable holder to signal board 4 The relationship between the switch in all kinds of sound sources and sound ha
14. Press the AUTO EQ button onthe remote control to display the analyzing curve Auto EQ setup is invalid in Hi Fi mode ue 2 2 9 Parameter Processing To memory the current parameter for later use or use the defauly parameter the Memory and Call functions will be used The current parameters to be adjustedinclude Channel Level EQ Bass Enhancer Sound Field Environment Surround MIC Volume MIC Treble MIC Bass MIC Delay MIC Echo and Voice Modification 1 Call Default parameter Press the number buttons 1 8 on the remote control and CALL 1 8 displays Setup will be processed automatically according to the default parameters 2 Memory Parameters Press the SAVE button on the remote control first to display SAVE Press the number buttons 1 8 on the remote control again under the display SAVE The current parameter is memorized into the corresponding number buttons and SAVE 1 8 displays 3 Call parameters Press the CALL button on the remote control first to display CALL Press the number buttons 1 8 on the remote control again under the display The parameters memorized in the number buttons before will be adopted currently and CALL 1 8 displays NOTE Due to some unexpected reasons the user memorized parameters will probably lost so please adjust again and then memorize The system wi
15. SELF TAPPING SCREW 0970003 RESONATOR G800 5070698 ENVIRONMENTAL PROTECTION 90 255 0 05 HC HC SURFACE STICKER OF REMOTE AV225T RU CONDUCT GLUE OF REMOTE CONTROL AV215T RU 6 13 PANEL UNITS 0880220 0570006 0780138 0630003 4000258 4630759 1561893 AV225T RU 5462310 3072242 IGLASS AV225T RU TRANSPARENCE 3003011 AV215T RU SUB LIGHT BLACK 3027985 RIGHT COVER BOARD AV228 SILVER 3072003 LEFT COVER BOARD AV225T RU AETHER SILVER DECORATIVE BOARD AV228 SILVER POWER PRESS BUTTON BOARD AV215T RU SILVER POWER BUTTON AV228 BLACK FUNCTION PRESS BUTTON AV228 SILVER DECORATIVE BOARD OF FUNCTION PRESS BUTTON 29 T HU SILVER 3027989 3029042 3027988 3027992 3029043 RESET SPRING AV228 STAINLESS STEEL SWITCH LOOK SELF TAPPING SCREW SOFT SPONGE SPACER 3810047 3870960 3871101 4000048 5232707 120 MATERIAL CODE MATERIAL NAME LOCATION 3M DOUBLE FACE GLUE 6 14 SOFEWARE PROGRAM 5232532 5232675 5448203 5448204 AV225T RU 890283 SM79164C25P DIP N100 SIGN STICKER CPU225TRU 0 6 15 SN LASEL 0882087 5156400 AV225T RU 5142076 5142067 SN LABELL RUSSIA WITHOUT BAR CODE NUMBER 6 16 SUPPLEMENT MODULE AV225T RU 5110002 ELECTRO WELDING WIRE 5110018 ELECTRO WELDING WIRE 5110004 ADHESIVE TAPE IT 5110003 ELECTRO WELDING WIRE 5120096 PEANUT OIL MER 5120004 5
16. V103 is also on and relay is disconnected finally and short circuit protection is finished Working process is shownas the following figure 3 2 6 3 Over current Voltage decrease Relay sampling triode L channel R126 R127 V114is V103 disconnects is connected to is V114 increases when on piv ae is on J and protection each channel over current starts up Figure 3 2 6 3 Over current and short circuit protection flow chart Similarly when over current appears in R channel power amplifier board voltage 159 will be more than 0 7V to make on power amplifier board V129 on and also make V103 on relay is disconnected finally to reach the purpose of protecting speaker 3 2 7 MIC headphone board MIC signal is directly sent to signal processing board through flat cable XP12 the principle has been specified in section 3 so it is omitted here The main element of headphone part is headphone amplifier N100 PT2308 It is a dual channel operational amplifier has 8 pins in all and adopts signal power 5 to supply power Pin 1 and 7 are two channels signal output ends pin 2 and 6 are two channels reverse input ends and 5 are two channels in phase input ends pin 8 and 4 are positive and negative power pins When no headphone is inserted headphone detect signal PH SW is low level now the mute control signals P LRM and P CSM of main channel centre and surround channels
17. and the flatcable falls off automatically 1 hin 3 5 Press downLCD screen bracketclasp with thumb 6 Separate LED back light sourceand LCD screen and forefinger ofright hand exertstrength with thumb bracket clasp towards direction ofarrow after claspA is away from PCB board press down towards directionof arrow clasp Afalls offand then claspB falls off automatically 85 4 Process of assembling LED back light source 1 Install LCD screen bracket clasp 2 Install LED back light source 3 Use brandiron to solderpin Aand B ofLED back light 4 Take LCD screenflat cable betweenthumb and source forefinger of righthand insert itinto flat cableholder push up flatcable plug toproper position 5 Take hold of LCD screen byleft hand andput down 6 Press theL CD screen tightly towards arrow direction 86 Chapter Cinque PCB board amp Circuit diagram Section One PCB board 5 1 1 Video Board 5 1 2 Volume Board DVDL DVDR VCDE VCDR a 105 W7 R116 8 P aurcs R170 0146 81694 gt C145 R1686 SS a fa EE 4 dr 1 15 W44 Tz C122 126 C127 C128 D 133 C130 C129 137 C136 C142 C135 C134 Q VD101 52512526007 8 AN apl
18. stage from front stage to back stage Ifa certain stage has no sound it means that this stage hastrouble The troubleshooting process is shown as the following figure 3 3 2 1 Karaoke has no sound Check whether there is sound signalon C252 C217 Check whether there is sound on R219 R221 Check whether there issound on R230 Check whether there is sound on C245 C246 Check whether base electrode of V104 V105 is 0 7AV Check whether E electrode of V103 ishigh level Whether MICDET is high level whether PKT is low level Check signal board Check N210 andMIC hole circuit Check PT2315 andCPU signal P SCCL P DATA Check N202 andits power supply circuit Check N203 andits power supply circuit Check whether V104 or V105 is strickenthrough Change V103 CPU MIC holeand V200 are damaged Figure 3 3 2 1 Troubleshooting process for Karaoke has no sound 41 2 Troubleshooting process for No spectrum display is shown as the following figure 3 3 2 2 No spectrum display Whether V105 collector electrode has highand low level variatio Check CPU bus Check power supply V105 N t displ 9 Spectrum display and peripheral circuit Check whether VD118is normal Change VD118 Whether positive direction voltage of N102B has sawtooth wavefor Check V103
19. 0000276 0000339 0000379 0000386 0000452 000466 0 0000495 0000475 0000556 0040069 CONNECTED CORDS 0 6 SHAPED 10mm CONNECTION CORDS 0 6 SHAPED 12 5mm RY 3W100 5 SHAPED R 20x8 CARBON FILM RESISTOR 1 6W5100 5 SHAPED 7 5 CARBON FILM RESISTOR 1 6W8200 5 SHAPED 7 5 CARBON FILM RESISTOR 1 6W1K 5 SHAPED 7 5 CARBON FILM RESISTOR 1 6W1 2K 5 SHAPED 7 5 CARBON FILM RESISTOR 1 6W4 7K 5 SHAPED 7 5 CARBON FILM RESISTOR 1 6W10K 5 SHAPED 7 5 CARBON FILM RESISTOR 1 6W3300 45 BELT 1 6W27K 5 SHAPED 7 5 1 6W47K 5 SHAPED 7 5 1 6W100K 5 SHAPED 7 5 1 4W1000 5 SHAPED 10 1 6W3 3K 5 SHAPED 7 5 1 6W2K 5 SHAPED 7 5 CARBON FILM RESISTOR 1 6W1500 5 SHAPED 7 5 CARBON FILM RESISTOR 1 2W2200 5 SHAPED 12 5 CARBON FILM RESISTOR 1 6W4 3K 5 SHAPED 7 5 CARBON FILM RESISTOR 1 6W2 7K 5 SHAPED 7 5 CARBON FILM RESISTOR 1 6W470 5 SHAPED 7 5 CEMENT RESISTOR 7W0 250 5 SQM SHAPED R 10x5 113 LOCATION W1 W16 W42 W43 W54 W61 W76 W77 W78 W8 W9 W15 W21 W24 W36 W37 W 45 W46 W48 W51 W57 W63 W69 W 71 W74 W80 W3 W18 W20 W22 W27 W31 W35 W41 W52 W59 W62 W65 W70 W73 W2 W14 W19 W26 W50 W53 W67 W72 W81 W33 W47 W49 W60 W68 W28 W39 W40 W58 W75 W56 W5 W6 W7 W10 W11 W12 W13 W6 4 R183 R184 R110 R140 R170 R174 R178 R103 R109 R112 R133 R139 R142 R 173 R177 R115 R145 R161 R166 R165 R167 R101 R131 R162 R163 R168 R164 R171 R176 R104 R134 R172 R169 R102 R132 R120 R122 R150 R152 R129 R159 R105 R1
20. 1CH input signal is detected it will automatically adopt standard mode if 2CH signal source is detected it will automatically adopt Hi Fi mode Press K R OK button to set standard Karaoke mode Automatically detect the input signal source If many signal sources input it will select the current signal preferentially Automatically set the parameters of Karaoke mode NOTE If the signal istoo weak or in the blank segment of music when operating the system will probably appear wrong indications m KROK V AV225T j 2 2 3 Select Input Sound Source This unit utilizes two input lines of stereo audio sources VCD DVD one line 5 1 channel signal input Select the input signal source manually through the remote control Press the INPUT button on the remote control and INPUT TUNER splays which means TUNER has been selected Press the INPUT button the remote control and INPUT VCD displays which means VCD 2CH input jack has been selected Press the INPUT button on the remote control and INPUT DVD displays which means DVD 2CH input jack has been selected Press the INPUT button on the remote control and INPUT 5 1CH displays which means 5 1CH input jack has been selected HOME THEATRE RECEIVER AVZ2ST 2 2 4 Bass Enhancer In order to strengthen t
21. CD4052 that is audio channel also selects VCD channel thus the synchronous switch of audio and video of VCD channel is realized Similarly for the synchronous switch of audio and video of DVD channel pin 1 and 2 of N106 M62446 of volume board send out 0 1 and INH 0 control signal of A and to fulfil the corresponding switch When 5 1CH is selected A 1 B 1 INH 0 the audio video switch in 5 1CH is fulfilled At last composite video signal outputs through triode V101 1015 When INH 1 CD4051 gas no output 35 Section Three Servicing Cases 3 3 1 Servicing instances Instance 1 Trouble symptom power on protection Description relay not attracting and display System abnormal auto protection Analysis and troubleshooting system protection after power on relay not attracting shown as in the figure 3 3 1 1 test whether L R C SL SR of power board flat cable holder XP8 has DC output pin 1 of power board flat cable holder 57 is tested high level pin 2 is low level C electrode of triode V101 15 high level known from the above test that protection is not caused by over current and over voltage you may also unplug XP7 and XP8 flat cable holder and check whether it also has protection The anode voltage of diode VD112 is tested 0 sorelay is judged abnormal It is normal after changing relay and trouble is removed C110 VD113 R100 220u 35V VD110 xl 1N4004 4713W IN4148 R102 cra R106 R108 1K K _____
22. FLUX 5120011 WIPING WATER 7 5120012 RED GLUEWATER SILICONE GREASE HEAT SEALING PAPER COLORLESS SEALING PAPER WIDTH 60MM COLORLESS LENGTH 15 YARD WIDTH 20mm PAPER ee LENGTH 15 YARD WIDTH 6mm HIGH TEMPERATURE MASKING ENGTH 15 YARD WIDTH 12mm HIGH TEMPERATURE MASKING ENGTH 15 YARD WIDTH 24mm 9120332 5120067 5230021 5230022 5233436 5231514 5231454 5231455 5231456 U U gt gt U U m m 2 2 121 MATERIAL NAME SPECIFICATIONS LOCATION 5160452 OA ENVELOPCASE STICKER OA PASS 11045 www 122
23. Karaoke you may adjust microphone treble when the sound is unclear Press the TONE button on the remote control twice then press or Y to adjust the treble of microphone The adjustable range is 6 The microphone treble displays as MIC TREBL 2 The microphone treble cannot be adjusted when not inserting microphone IK HOME THEATRE RECEIVER AVZ25T MIC VOL VOL Volume 4 Echo When inserting microphone to sing Karaoke you may adjust microphone echo when the sound is weak or not full Press the ECHO button the remote control then or Y to adjust the echo of microphone The adjustable range is 0 7 The microphone echo displays as MIC ECHO 2 The microphone echo cannot be adjusted when not inserting microphone 5 Delay When inserting microphone to sing Karaoke you may adjust microphone delay when the sound is not full Press the DELAY button on the remote control then press to adjust the delay of microphone The adjustable range is 0 7 The microphone delay displays as MIC DELAY 2 The microphone delay cannot be adjusted when not inserting microphone 6 Modify When inserting microphone tosing Karaoke you may select microphone euphonize mode when the sound is unsuitable
24. Mute Function Volume Control in 1 25 dB step Low Distortion Low Noise and DC Stepping Controlled by IIC BUS Micro Processor Interface Pin to Pin Compatible with TDA7315 9 3 DESCRIPTION ee o o nm O ae _ wm om ee 3 5 18 function introduction to 74VHC245 1 Description The VHC245 is an advanced high speed CMOS octal bus transceiver fabricated with silicon gate CMOS technology It achieves high speed operation similar to equivalent Bipolar Schottky T TL while maintaining the 75 CMOS low power dissipation The VHC245 is intended for bi directional asynchronous communication between data busses The direction of data transmission is determined by the level of the T R input The enable input can be used to disable the device so that the busses are effectively isolated All inputs are equipped with protection circuits against static discharge Features High Speed Tpd 4 0 ns typ at Vcc 5V High Noise Immunity Vnih Vnil 28 Vcc Min Power Down Protection 15 provided on all inputs Low Power Dissipation lt 4 uA 254 2 Low Noise Volp 0 9V typ Pin and Function Compatible with 74HC245 3 Truth table H HIGH Voltage Level L LOW Voltage Level Immateri
25. P CHARGE R218 14 P DIST 217 R195 470 oO P SEARCH F216 16 0 P_SCART R215 1470 4 P 174094 18 1470 1162446 CONI5 R209 2 58 P 4 G100 R213 R214 C108 24576M BV 5V R179 10K P_ADINTO R 5V C105 R100 103 22K C107 104 RESET V100 R211 4 9014 L 47u16V P_SEARCH peog 66 BURST 169 47K KM FAN HEADPHONE VD107 1 4004 R167 47K R168 4 7K Y VN Nia 9014 V4 8153 47K 4 22u16V VD108 1N4148 V110 9014 55050 LINE OUT pcc 47u 16V 47n i D 5V C135 0130 C128 C129 47n C125 C122 C134 47 4 7u 16V R142 47K L i R145 4 K L R143 10 R106 2205W 12V 12V C124 C121 1000u 16V 47n C143 C144 47u1ev 220 16 C142 100u 16V 47 47 n 1 12V 12V f 1 XC100 N SW OUT e C100 C103 47 C104 47P L 10416 R109 CL HOM R121 22K R101 43K pi 2 8115 lt 12Vv ga S8050 100K N100B N100A 4 R137 12K c i Te pe Cy R139 C113 B pai Hoe NL 10K 47 16 4l 9014 10K C131 10w16V 12V oo
26. R123 R175 111 R MATERIAL NAME SPECIFICATIONS LOCATION R111 R134 R139 R144 R149 R153 R 0090019 SMD RESISTOR 1 16W 4 7K 5 0603 ise R108 R117 R125 R131 R133 R137 R 138 R142 R143 R147 R148 R152 R1 0090023 SMD RESISTOR 1 16W 10K 5 0603 56 R157 R161 R162 R166 R172 R17 8 R179 R186 R187 R189 R212 R213 H214 164 R167 0910067 0067 SMD CAPACITOR CAPACITOR 5OV 152 10 0603 C105 C142 C143 C144 C145 C146 C 0310072 SMD CAPACITOR 50V 103 10 0603 147 148 149 150 125 126 1 52 151 0310594 SMD CAPACITOR 25V 104 10 0603 C102 C107 C108 C155 0310188 SMD CAPACITOR 50V 10P 5 NPO 0603 C113 0310191 CAPACITOR 50V 30P 5 NPO 0603 C103 C104 0310471 SMD CAPACITOR 50V 561 595 NPO 0603 C116 C117 0310198 SMD CAPACITOR 50V 472 10 7 0603 C122 C123 0310202 SMD CAPACITOR 50V 223 10 0603 C128 C129 0310206 SMD CAPACITOR 50V 683 10 0603 C131 C132 0310634 SMD CAPACITOR 25V 154 10 7 0603 C134 C135 0090023 SMD RESISTOR 1 16W 10K 5 0603 R100 R101 1940214 ICABLE SOCKET 28P 0 5mm SMD SUBMIT MEET WITH B100 CLASP PCB 1228 0 6 7 AMPLIFIER BOARD 1631476 12 MATERIAL CODE MATERIAL NAME SPECIFICATIONS AV225T RU 5448202 CONNECTED CORDS F 0 6 SHAPED 7 5mm 2100003 2100004 2100006 2100007 2100010 2100016 2100017 2100024 0010340 0000125 0000128 0000129 0000130 0000133 0000137 00000139 0000141 0000144 000146 0
27. STANDARD Standard 3 Cyber Logic In order to make 2 channel input signals have multi channel sound field effect you may select Cyber Logic sound field Press the CYBER LOGIC button on the remote control and CYBER LOGIC will display which means the system enters Cyber Logic sound field if INVALID displays it means the system cannot enter Cyber Logic Cyber Logic mode is invalid 5 1 channel signal input Cyber Logic 4 Surround In order to cater for different listening Environments and meet different sound effect requirements of customers you may select different surround modes in 5 1 channel signal input status Press the SURR button on the remote control in 5 1 channel signal source input the surround will display Press the SURR button on the remote control Repeatedly you may selectthe environment Modes between Affectional movie Sowordsmen movie Gunfignt movie Sci fi movie and music The environment surround is invalid in 2 channel signal input status The environment surround is invalid if microphone is inserted Surround 2 2 6 Adjust Volume 1 Master Volume When the current sound is too high too low or unsuitable you may press the MASTER VOL on the front panel orremote control to adjustthe volume of all channels Press the button of master vo
28. V104 VD115 VD116 C137 Whether negative direction voltage of N102Bhas sawtooth waveform Check N102 and peripheral circuit Whether N108 and CPU control pin working is normal Check control signal N108 and peripheralcircuit Check 7 segment bandpass filter C115 and theauto gain adjustment circuit composed by N105 Figure 3 3 2 2 Troubleshooting chart for No spectrum display 42 3 Troubleshooting process for Power on protection is shown as the following figure 3 3 2 3 Power on protection Check whether there is central point voltage Check which channel outputs DC and checkthis channel whether protectio Check whether thecurrent 0 protection diode ortriode is 522 244 damaged or capacitorC115 is not good whether power amplifier board resistor Change resistor R111 R141 has open circuit Check whether resistor R108 Change resistor has open circuit Check whether RLY detect Check whether power board VD108 is lowlevel and change V100 signal is abnormal Whether it ismachine vibration protection Change relay Figure 3 3 2 3 Troubleshooting flow chart for Power on protection 8 4 Troubleshooting process for Cannot search automatically is shown as the following figure 3 3 2 4 Cannot search automatically Whether DISPLAY signalis Check CPU boardspec
29. a EH di r ii 1 R129 G 6150 2101 7 i aM lr 200601 17 r XS20 XS22 9 45 48 E aeo gt Q gt o G a 4 gt 2 a 0805 pereat n 88 5 1 3 Signal Board 2 3215T 2 LLC 2005 06 15 e 8 C101 i 5 6 105 cN FE 02146 SN LLL ie AE ress 9888 260235 N204 c232 Mile cod 89 5 1 4 Power Board R120 XL101 u 1 V103 R107 V102 R115 Bit R114 DL OF R11 R11 NNI R11 Rtt XS1 R116 W15 R117 FL100 T4AL250V CN q re tO O 7 2 1 p re LO C105 5 90 5 1 5 Key 5 Board 5 1 6 p 4 XJ1 MIC DET GND GND X100 9215T 1 2004 08 09 5 1 7 audio power amplifying Board C149 148 de wo Scias SES C130C129 VD112 1 VD114 W35 C116 106 101 y VD111 VD113 w20 W77 W78 T6 3AL250V T6 3AL250V W74 L 44 C143 1 FL101 FL102 93 Xx gt 0690090690990 BMC RK NOL 0 o test t teste 4 rs POL 272445
30. all produced by left and right channel signals but in S C signal complete left and right channel signals are included so it is ok to sample from S C only Therefore S C signal is outputted through R195 13 of N103 to N108B and added with OK R signal for the amplification of spectrum sampling signal and then sent through XS20 to frequency point gating and auto search circuit the same when selecting 5 1CH input 5 1CH control signal is high level 14 15 4 of N102 select 14 4 of X1 Y1 Z1 of N103 and connect to X1 Z1 thus the 6 channel signals are outputted through pin 13 of N103 to N108B and added with OK R signal for the amplification of spectrum sampling signal and then sent to frequency point gating and auto search circuit through 520 4 Tuning function This player has tuning function which provides a good selection for users It directly controls digital tuner through MCU to receive audio signal and then output after amplification by power amplifier The clock and data line of digital tuner is commonly used together with M62446 the other two control lines are directly connected to MCU L R signals after being handled by digital tuner are directly sent to pin 1 and 12 of N101 CD4052 for gating input S09 x 3 2 2 Signal processing board circuit The signal board performs mixed amplification to 5 1CH signal sent from volume board voice signal sent from microphone headphone board and Karaoke echo signa
31. block diagram is shown as in the figure 3 2 6 1 take channel as instance AC negative feedback mM _ Composite power R121 R109 C105 amplifying V132 V112 Difference Voltaae amplification 1 Stage V102 g V103 stage V105 stage V106 Speaker V101 V116 Constant current sourceV104 V107 Composite power Mute Vd102 Vd103 V133 Figure 3 2 6 1 L inputblock diagram Relay L channel signal through R101 R103 C101 coupling is sent to B electrode of V102 V102 and V103 are composed difference amplifying circuit of single ended input and single ended output Sound signal outputs from C electrode of V102 to B electrode of voltage amplifying stage and then outputs to composite power amplifying stage after voltage amplification V104 V107 VD102 and VD103 compose constant current source circuit VD102 and VD103 provide constant base electrode currentfor V104 and V107 The emitter electrode resistor of V104 decodes working current of difference amplifying stage the emitter electrode resistor of V107 decides working current of voltage amplifying stage V132 and V112 compose multiple unit tube amplifying to make the final stage of power amplifier have strong current amplification capacity and they compose waveform positive half cycle amplification V133 and V113 compose the negative half cycle amplifying of waveform and its circuit structure is the same with that of upper tube The function of temperature compensati
32. by infrared receiver a mute signal is achieved to send to MCU which sends out P_LR high level and P CSM high level mute instruction at the same time P_LRM high level make 2N5401 V115 58050 V101 S8050 V116 on left right channel signal is short circuited to ground to fulfil the mute control function of left right channel P high level makes 9014 V150 on 2N5401 V130 and 58050 V131 on centre channel signal is short circuited to ground and centre channel mute control function is fulfilled at the same time the on of 9014 V150 makes 9014 V151 cutoff voltage of pin 5 of 7265 is positive power voltage 7265 internal mute circuit works to reach surround mute function When headphone is inserted HEADPHONE controls LRM and SCM through iX VD203 and VD204 to make main channel centre and surround channel mute 3 C SR SL power amplifying circuit Compared with the former models the three channels of AV225T RU adopt power amplifying IC CD1875CZ N104 and TDA7265 N106 special for audio As for TDA7265 N106 it has 11 pins in all pin 3 1 and 6 are its positive and negative power pins respectively pin 10 8 are its reverse input end the rated output power of each channel of this power IC may be up to 15W and it is with function of auto mute when power on it has 5 pins in all and it is a good performance power amplifying IC the application circuit is simple and has 15W power output in rated state Pin 5 and 3 ar
33. can connect this unit to power Press the POWER button this unit enters the standby mode When this unit isin the standby mode it detects the input signals automatically When there is signal input this unit turns on automatically When the input signalis too small this unit might not detect the signal and will notturn on automatically When there is signal input and the unit cannot turn on automatically press the STANDBY button on the front panel or remote control to operate manually and selectinput signals by using the INPUT button When the unit isin the standby mode press the STANDBY button on the front panel or remote control to turn on this unit Press the STANDBY button on the front panel or remote control After turning on this unit it detects the input signal automatically When there is signal input it receives the input signal automatically Otherwise the unit will automatically search signals all the time When there is signal input but it cannot receive The signal automatically press the INPUT button the remote control to select the input signal When the unit isin normal working mode press the STANDBY button on the front panel or remote control if you want to enter standby mode Please turn offthe power when you are not going to use theunit for a longtime Please turn offthe power every time after you use the unit Press the POWER button on t
34. each key link of the disassembly and assembly process of the player is presented in means of pictures to prevent users from incorrect operating and damaging elements This player is composed by control panel components power amplifier board components signal board components volume board components power board components and MIC board components So please operate according to illustration strictly 1 Disassembly and assembly process for the unit 1 Use electric screwdriver to unfixscrews in thejoint 2 Use electric screwdriver to unfixleft and righthand side upper coverscrews A B andC place of upper coverand rear cover a ssp i 1 I t J w ano Cau E 3 Take down upper casing 4 Pull downtuner flat cable Aand video flatcable B 79 5 Use electricscrewdriver to unfixscrews Aand B inthe joint position oftuner and rearcover andthen unfix 6 Pull Gown on volume board screws C andD in thejoint position ofvideo board and rear cover then take themdown 7 Use electricscrewdriver to unfixscrews A E and screws A Bin the jointposition of volumeboard and rearcover and then takedown volume board 8 downflat cable A E on signalboard f Li 4 TEE 9 Use electricscrewdriver to unfixscrews Dand E 10 Pull downflat cableA B Cand D onpower amplifier in the jointposition of signa
35. of pin 5 of TDA7265 is about 5V lower than power voltage SL SR channel resumes normal output 2 Over voltage protection on each channel s output end a over voltage sampling resistor is connected L channelis R116 R channel is R117 is R118 SR R120 and R119 respectively When just one channel s central point voltage is more than 3 5V or less than 3 5V V101 or V102 is on to make their C electrode voltage decrease B electrode of V103 is pulled down to make V103 on relay is disconnected finally and over voltage protection is fulfilled Working process is shown as the following figure 3 2 6 2 When more y V101 is on Over voltage than 3 5V Voltage Relay sampling resistor L channel of C V103 disconnects is connected to is R116 electrode is on and protection each channel When less __ V102ison decreases starts up than 3 5V Figure 3 2 6 2 Over voltage protection flow chart 3 Over current and short circuit protection on the output load resistor of L R channel a over current sampling triode is connected Sampling triode of L channel is V114 on power amplifier board load resistor is R126 R127 on power amplifier board C SR SL channel power amplifying IC is with over curent protection function inside Only over current appears in L channel the voltage decrease that produces on R126 R127 will increase Once the voltage decrease of R129 on power amplifier board is more than 0 7V V114 will be on
36. offset current 5 n A Input common mode voltage range includes ground Differential input voltage range equal to the power supply voltage Large output voltage swing OV to 1 5V 3 PIN DESCRIPTION 03 Om os me ft o me ow oe 9 oem 1 3 5 17 function introduction to PT2315 1 Description PT2315 is a two channel digital audio processor utilizing CMOS Technology Volume Bass Treble and balance controls are incorporated into a single chip Loudness Function is also provided to build a highly effective electronic audio processor having the highest performance and reliability with the least external components All functions are programmable using the Bus The pin assignments and application circuit are optimized for easy PCB layout and cost saving advantage for audio application Housed in a 20 pin DIP SO Package PT2315is pin to pin compatible with TDA7315 and is very similar in performance with performance with the later Features CMOS Technology Least External Components Loudness Function 2 Treble and Bass Control Input Output External Noise Reduction System Equalizer 2 Independent Speaker Controls for Balance Function 74 Independent
37. reverse end of N102B and then added to the reverse end of N102A after amplification Now the C1 1 signal after processed by echo scene surround mode is also required to add to the reverse end of N102A and mixed amplifying with it then sent to centre channel power amplification circuit Surround SR 1 SL 1 signal of the other path volume board is directly sent to surround channel power amplification circuit One path of 5 1 signal after mixed amplification is sent to power amplification circuit through 59 the other path forms DIST signal distortion detect signal to MCU board through R111 R112 R142 R145 VD100 VD104 to perform auto gain adjustment to control the volume output 3 2 3 MCU board circuit MCU board is composed of player control circuit auto search input signal and spectrum analysis circuit 1 The player control N100 is the control centre of the player various control instruction are outputted by it to each controlled circuit to fulfil each control function 5V power supply is adopted and pin 40 is its power supply pin Pin 18 19 externally connects with 12M crystal oscillator to provide itself with working clock frequency Pin 9 is its reset pin when power on 5V charges C106 through R100 The voltage on the two ends of capacitor cannot change suddenly so B pole of triode V100 is low level that is V100 is not on a high level reset signal is given to MCU When capacitor C106 charging finishes V1
38. saving Images i Select Folder Save TEKDODB BIMP 5 0mVv BU US 1 41m 20 06 13 53 1 15 z4kHz 8 Waveformdiagram of outputting C133 L after volume adjustment Tek Wilks Trig d Pas 0 0005 REC Action File Format BMP About 1 4 Saving Images Select Folder Save TERKOOOS BMP 50 0 500 CHI 1 01m 20 Mar 06 20 01 Jab 231Hz 51 9 Waveform diagram of outputting C134 after vvolume adjustment Tek wal La Pos 0 0005 Action About 1 Saving mages File Format Select Folder 3 50 0 5005 1101 20 Mar 06 20 01 1 05822kHz 10 C135 C waveform diagram in Cyber Logic state Tek T Trig d Pos 0 0005 Action File Format about 1 saving Images I Select Falder Save 500mw 50015 20 Mar 06 20 01 1 11 136 SL waveform diagram in Cyber Logic state Tek Tria d 0 0005 SAVE REE Action 1 Saving Images Select Folder save 1 3500mw us CHI 20 Mar 06 20 01 1 1022 TkHz 250 12 C137 SR waveform diagram in Cyber Logic state Tek A Triad Fos 0 0005 arton AC oUt 1 Saving Images S
39. then send to MCU for processing after being received by remote control receiver 3 2 5 Power board circuit Power board provides each unit circuit of the player with required various working voltage Shown as in the figure 3 2 5 1 AV225T RU adopts a large power round transformer to supply power for main channel central and surround channel power amplifier Panel display MCU power supply 220V 50HZ Left right channel power amplifying level Rectification filtering C SL SR channel power amplifying level Rectification filtering Figure 3 2 5 1 Power board powersupply block diagram 1 The two groups AC 31V outputted by the first time grade of transformer through rectification filtering of 8 In5404 and 2 large electrolytic capacitor 15000uF 68V gets 43V voltage to supply power for left and right channels 2 The two groups AC 15V voltage outputted by the second time grade of transformer through rectification filtering of 4 In5404 and 2 electrolytic capacitor 4700uF 35V gets 21V voltage to 2830 lt Supply power for SL SR C channels In addition for other IC and operational amplifiers power is achieved also through voltage regulation of 3 end voltage regulator L7812 L7912 by it to supply power for other IC 3 2 6 Power amplifier board and protection circuit 1 L R channel power amplifying circuit L R channel power amplifying circuit of AV225T RU is composed of discrete components The composed
40. 0 0005 About N Sum mages Select Folder Save 5 005 5000 1 05mv Current screen display saved 4 4 54 18 P_CHARGE waveform diagram after signal being detected Tek AL Stop Pos 0 0005 SAVE REC Action 1 saving Images Select Folder 50 0 5 238v Current Folder is 4 5 19 P_ADINTO waveform diagram after signal being detected Tek AL e Stop Pas 0 0005 SAVE REC Action save Image File Format About Saving mages Select Folder Save 2 004 50 0 5 CHI 213 20 Mar 06 20 12 251 Note C138 SW has waveform only when bass enhancer is in off state 55 3 4 2 Key point voltage 1 Power board VC 43 5V VC 43 5V VD113cathode terminal 12 8V 19 3V when in standby Vd111 cathode terminal 6 3V DV when in standby P RC 0V 4 8V when in standby 2 Power amplifier board L7812 pin 3 12V L7912 pin 2 12V TDA7265 pin 20V Pin 6 20V over 5 3V 0V whenin standby S MVTE OV 19 5V when mute 3 CPU board When in standby V103 pin 5 2 0V 0 1V after signal being detected VD101 cathode terminal 3 45V 0 6V after signal being detected R175 P CHARGE 0 65V waveform after signal being detected
41. 00 is on now reset finishes Form ofthis kind of reset circuit is high level reset and low levelis kept When the player is working information of power on picture and Chinese characters when operating displayed on display screen are all saved the static memorizer inside MCU N101 isa state memorizer and it can save the working state of the player at the time of power off and then call these states until power on next time to avoid the adjustment of users again All kinds of user set sound field modes are also saved in it and can be called when necessary 2 Input signal detecting search circuit automatically DISPLAY signal from volume board is sent to N103A for amplification after being coupled by capacitor C110 sent to the reverse end of voltage comparator N103B outputted from pin 7 of N103B then sent to 16 of the player MCU through VD103 V101 R109 R107 When N103B outputs high level Vd103 is in reverse cutoff state B electrode of switch pipe V101 is high level now switch pipe V101 is in on state and then a 5V P SEARCH high levelis achieved through VD101 voltage regulating to MCU which means there is no signal input and the search continues When output terminal of N103B outputs a low level VD103 is in positive direction on state B electrode of switch pipe V101 is low level now switch pipe is in curoff state MCU detects that P_SEARCH is low level which means there is signal input at the sametime the search stops
42. 04052 1 DESCRIPTION The CD4052 is a dual 4 channel multiplexer with two binary control inputs and inhibit input The two binary control input signals select 1 of 4 pairs of channels to be turned on and connect it to the two outputs The operating voltage is as to 18V and quiescent current is as low as 5 HA max at Vpp 5V 2 PIN CONFIGURATION Y channel selection port 1 x 60 wa NN n s n NN 1 3 TRUTH TABLE 3 5 5 function introduction to CD4053 1 DESCRIPTION The CD4053 is a triple 2 channel multiplexer having three separate digital control inputs A B and C and an inhibit input Each control input selects one of a pair of channels which are connected in a single pole double throw configuration The three binary control input signals select 1 of 2 pairs of channels to be turned on and connect it to the three outputs 2 Features The operating voltage is as to 18V and quiescent current is as low as 5 HA max at Vpp 5V 3 PIN CONFIGURATION 61 3 5 6 function introduction to SM79164 1 Description The SM79164 series product is an 8 bit single chip microcontroller with 64KB on chip flash and 4K byte RAM embedded It is a derivative of the 8052 micro controller family It has 8 channel PWM build in User can access on chip expanded RAM with easier and faster way by its bank mapping direct addre
43. 06 R135 R136 R175 R179 R113 R116 R143 R146 R117 R125 R147 R155 R128 R130 R158 R160 R114 R144 R107 R108 R137 R138 R126 R127 R156 R157 CODE 0010322 0010321 0200066 0200333 0200306 0210030 0210147 0260039 0260019 0260021 0260027 0260063 0260163 260134 lt gt T 20 gt 0 0260135 0260465 0260487 0882646 0880131 0880380 0881418 0880324 0880325 0880381 0882618 0881102 0570006 0570020 0580080 0780032 0780025 MATERIAL SPECIFICATIONS METAL OXIDE FILM RESISTOR 1 4 W33K 5 METAL OXIDE FILM RESISTOR 1 2W33K 5 SHAPED 12 5 PORCELAINCAPACITOR 50V 221 10 2 5mm POLYPROPYLENECAPACITOR 500V33P 10 NPO SHAPED 5mm POLYPROPYLENECAPACITOR 50V 47P 10 SHAPED 5mm TERYLENECAPACITOR 100 104 10 7mm TERYLENECAPACITOR 100V 473410 5mm CD CD11 25V47Ux20965x11 2 CD CD11 16V10Ux20965x11 2 CD11 25V4700U 20 16x35 7 5 CD11 25V4700U 20 16x40 7 5 3 3V 5 1 2W SHAPED 7 5 LOCATION R121 R151 R111 R141 C104 0114 C108 C118 155 156 143 144 C109 C119 C127 C128 C139 C140 C 150 151 102 106 112 116 1 34 157 135 136 101 111 124 121 123 122 125 131 132 105 115 148 149 129 130 110 120 137 C103 C107 C113 C117 C141 C142 C141 C142 D O00 C159 C146 C147 N101 N1010 0000 1010 0000 1010 0000 1010 0000 102 N1020 0000 104 106 VD101 VD107 VD111 VD112 VD113 VD11
44. 103 Cl15 56K E ub C9015 47U 25V C vio 4 C113 121 Vay 20u 16V 103 C114 220u 16V 12 2 gt lt 512 SR2 VC GND GND VC 9014 RELAY 4 XL101A XL101A WP6 WP6 1N4148 prog 01 D 5V N100A 3 PT2308 C106 330u 16V C103 2 R103 4 7K 10u 16V R109 R101 47 47 D 5V X100 7 9 4 R107 10K D 5V O 2 D NZ R105 o 8 4 4 DGND 47K m BH 6 e O _ 7 PH 4 C105 10u 16V PH R EX R106 PH L C102 47K 100u 16V MIC N100B N Z 5 PT2308 C107 T R104 4 7K C104 10u 16V R110 R102 R108 10K 47K SW C100 103 C101 103 MIC1 MICI GND GND MIC DET peog DIN 8 XP104 N102_74VHC245 103 74 245 3V3 R102 z ND 47 CON8 N C104 47416 C105 47UN6V VD105 VD106 VD107 D 5V 3V3 184148 184148 C106 V100 47UA6V 47UA6V 473 8050 C100 151 100 C101 151 peog Ady 6 Chart 6 BOM List CODE MATERIAL NAME SPECIFICATIONS LOCATION 6 1 VOLUME BOARD AV225T RU 5447607 0881743 0882161 0880445 0880124 0390425 100UH 10 0307 SHAPED 12 5 L101 5447608 2110 0 AV110T RU Al SEGMENT AV225T RU 5447608 2100003 CONNECTED CORDS 0 6 SHAPED 7 5mm W1 W73 00000099 CARBON FILM RESISTOR 1
45. 2 2000009000 255259252526 PR 520 OQ SS zs 7 4 4 CIT etf www NN OOOO MSAN OOO 5660050 Cs 505625255255 ICCC ICICI OEO 2106 5 1 8 Surface layer of CPU Board 94 5 1 9 Bottom layer of CPU Board Y Z Y I Z I K lt IKCKY Y IVOWINI IIIII VK W WBA KIIII AI sassa pusana Se Se TEN TOTA SES eat 7 5 DS lest 9 5 25 OO Now 209 4 7 I o tete ON 654 6 oC 06 te SO 9 500 9 O o 5 tere nol OO 36 e 520009 DON OGOOGO Soo 7 D 502526 SO Cotas OO Za Z_ 90 9 eet 4 ei xy 4 5252 22 5606000 5 OOO 5 ette 4 9 UOS 5 OS 9 or ete 65
46. 3 1 4 1 i TUNER L R 5 c 1 d VCD L R 1 S Hi i DVD L R U T 31 L R iy o dedicat Lco d 5 1CH L R S S C S SL S SR L 11 MIC headphone 1 Video in out board 11 MIC MIC input 9 16 i 2 eect ttt 1 180449 210023299 Ao oj Volume board 5 1CH C SL SR 5 1CH SW S C C SL SR SW SW OUT DVD all in one input MIC uonisodaJg uonoejoJg SW mute andrelay state detect 2 TUUM Main power utn Control panel Hi P Dio P D7 Power board I intermit lt p RSURS RW PE HOD dispiey eee ee cee CPU PT2222 remote control P SEARCH Fog SN 6 8V P REM EEPROM circuit 5 AN 6 8V 24002 CPU board U BuiAJiduiy Figure 3 1 4 1 The player signal flow chart 19 Section Two Unit Circuit Principle 3 2 1 Volume board circuit AV225T RU has 4 kinds of input means in all tuning input VCD DVD stereo input and 5 1CH input The Cyber logic function ofAV225T RU is to achieve C SR SL and SW
47. 4 VD10 V150 V151 V105 V115 V120 V130 re 125 2 5 2 PIN WITH NEEDLE THE SAME 2121182 FLATCABLE DIRECTION XP13 es oe pcvenrasonroweowo mojm po ors arenes ea es es ee ee ees er pm we PP ee row ee _ 15 MATERIAL CODE MATERIAL NAME LOCATION SOFT SPONGE SPACER 6 8 SURFACE CONTROL BOARD 5230979 5230928 5231418 5232006 AV225T RU 5448203 2100003 CORDS W1 W12 0000133 CARBON FILM RESISTOR 1 6W4 7K 5 SHAPED 7 5 R105 0000137 CARBON FILM RESISTOR 1 6W10K 5 SHAPED 7 5 R101 0000338 CARBON FILM RESISTOR 1 6W15K 5 SHAPED 7 5 R104 0000129 FILM RESISTOR 1 6W1K 5 SHAPED 7 5 R106 0000488 CARBON FILM RESISTOR 1 6W2200 5 SHAPED 7 5 R107 0000556 CARBON FILM RESISTOR 1 6W470 5 SHAPED 7 5 R102 R103 0000599 CARBON FILM RESISTOR 1 6W10 5 SHAPED 7 5 R100 0200062 PORCELAINCAPACITOR 50V 15111096 2 5mm C100 C101 0200310 POLYPROPYLENECAPACITOR SOV 103410 SHAPED 5mm 0200138 PORCELAINCAPACITOR 50V 10442096 5mm C102 C103 0210147 TERYLENECAPACITOR 100V 473 10 5mm C105 C106 0210025 TERYLENECAPACITOR 100V 473595 6mm C105 C106 0 0 0 0 210 EMISSION PPE POWER SUPPLY SWITCH LIGHT TOUCH RESTORE SWITCH S100 S111 0882134 0882088 0880220 0570006 0780032 0780138 0630003 0970003 1350090 1340003 2121085 16 M
48. 49 148 103 103 103 103 196 100K C114 22P R137 56K 12V 12V R170 75K R129 A 6 8V R131 220 0 5W C107 12V 47016 D100 VD101 R144 47K je R168 27K eas ae N ss 47 16 C103 C145 2 Rt67 10n 3 SUB wr R146 33K 100K 21 og 12V 12V pIeog SUNON CCS 96 C135 1 4 Lj R162 10K b 13 pe 0114 8165 asss 1N4148 1K A R163 12 N106D 4 7K LM324 8166 10K 22u50V C132 C131 8157 pes VD113 8160 134Hz R158 10 N106C 4 7K LMa24 R161 aly C133 C129 10K 22u50V dm 8152 10K VD112 8155 LL 1N4148 1K 300Hz 8153 N106A 47K LV324 R156 pL C130 C144 10K 2 2u 50V 12V 108 108 R148 C125 10K 103 100K VD111 R151 6 1N4148 1K 7 pe R149 5 N106B 47K LVG24 8186 C127 if gt 10K 22u 50V 8146 1K C R147 1 124 10K 22u50V R141 1K 6 3KHz R142 pL 22u 50V Cl115 10W 16V C114 DISPLAY 10u16V R129 470 R118 412V R127 111 VD106 75 68V R126 PR VD107 10K 68V R124 w 12V 6 8V 470025 P GNA R122 15K N104 CD4051 10 P ADSELB 9 ADSELC C100 C102 47u16V 104 L100 p RESET P 8207 4 10 P SELECT 208 11 P ADINTO 220 4 0 12 R219 470 13
49. 6W1000 5 BELT R163 R164 R165 0881430 0881429 0880443 R103 R106 R107 R110 R111 R114 R 1 6W1K 5 BELT 115 R118 R119 R122 R124 R126 R1 00000229 CARBON FILM RESISTOR 97 R130 R198 00000469 CARBON FILM RESISTOR 1 6W22K 5 BELT jai 155 R156 00000489 CARBON FILM RESISTOR 1 6W27K 5 BELT R143 R147 R168 105 MATERIAL NAME SPECIFICATIONS LOCATION CARBON FILM RESISTOR 1 6W30K 5 BELT R148 CODE 00000499 00000509 CARBON FILM RESISTOR 1 6W33K 5 BELT R142 R146 R104 R105 R108 R109 R112 R113 R 00000529 CARBON FILM RESISTOR 1 6W47K 5 BELT 116 R120 R117 R132 R121 R144 R1 40 R152 R174 R178 00000549 CARBON FILM RESISTOR 1 6W56K 5 BELT R137 R138 R195 00000569 CARBON FILM RESISTOR 1 6W68K 5 BELT R169 00000579 CARBON FILM RESISTOR 1 6W75K 5 BELT R170 00000599 CARBON FILM RESISTOR 1 6W100K 5 BELT R139 R157 R162 R167 R191 R196 00000629 CARBON FILM RESISTOR 1 6W150K 5 BELT R133 R134 R135 R136 00006239 CARBON FILM RESISTOR 1 2W2200 5 BELT R129 R131 02003059 POLYPROPYLENECAPACITOR 50V 22 10 SHAPED 5mm BELT C114 02003079 POLYPROPYLENECAPACITOR 50V 10121096 SHAPED 5mm BELT C109 C110 C112 C139 C140 C141 02003089 POLYPROPYLENECAPACITOR 50V 2214 1095 SHAPED 5mm BELT C105 C106 C113 02003109 POLYPROPYLENECAPACITOR 50V 1038 1095 SHAPED 5mm BELT C144 C148 02003149 POLYPROPYLENECAPACITOR 50V 82241096 SHAPED 5mm BELT C123 C128 TEMETAL OXIDE FILM RESISTORLENECAPACITOR TEMETAL OXIDE F
50. AM ANT and GND terminals 3 Let go of the button to clamp the speaker cord Pull the cord lightly to check the connection is right or not How to Connect gt Push jack button to openit Insert the speakercord Let go off the buttonto clamp thespeaker cord gt 5 Adjust the direction ofAMround antenna to getthe bestreceiving effect Rotate NOTE 1 AM round antenna should be placed far away from the equipment You may put up on the wall or on the bookshelf 2 AMround antenna and outdoor antenna can be used at the same time Connect to FM Antenna Connect to the indoor FM antenna Connect the accessional indoor FM antenna to 750 UNBAL FM ANT terminal NOTE Do not use the outdoor and indoor FM antennae at the same time GND Grounding terminal In order toensure the safety and decrease theinterference please well conne
51. ATERIAL CODE MATERIAL NAME LOCATION 2121987 FLAT CABLE dw Qi 2121388 FLAT CABLE a 3027993 LCD SCREEN BRACKET PYROCONDENSATION SLEEVE 6 9 VIDEO INPUT OUTPUT BOARD 1200566 5233838 5232576 1563092 AV225T RU 5447611 CD CD11 16V100U 20 6x12 2 5 TC101 CARBON FILM RESISTOR 1 6W1O 5 SHAPED 7 5 R108 0260027 0260028 0880271 0881428 0780043 0000599 0000120 CARBON FILM RESISTOR 1 6W22O 5 SHAPED 7 5 R103 0000122 CARBON FILM RESISTOR 1 6W100O 5 SHAPED 7 5 R101 R102 R104 R105 0000140 CARBON FILM RESISTOR 1 6W22K 5 SHAPED 7 5 R106 0000137 CARBON FILM RESISTOR 1 6W10K 5 SHAPED 7 5 R107 0200174 PORCELAINCAPACITOR 50V 103 10 2 5mm C101 C102 C103 SOCKET 2 5mm XS101 TERMINAL SOCKET AV3 8 4 14 ES 10 XC101 PCB C110T 2 6 10 MICROPHONE HOLDER BOARD 1940006 1910239 1564056 AV225T RU 5448204 2100003 CONNECTED CORDS W1 W2 W3 0000133 CARBON FILM RESISTOR 1 6W4 7K 5 SHAPED 7 5 R103 R104 0000137 CARBON FILM RESISTOR 1 6W10K 5 SHAPED 7 5 R107 R108 0000140 CARBON FILM RESISTOR 1 6W22K 5 SHAPED 7 5 R100 0000144 CARBON FILM RESISTOR 1 6W47K 5 SHAPED 7 5 R101 R102 R105 R106 R109 R110 117 MATERIAL CODE MATERIAL NAME SPECIFICATIONS LOCATION 0200174 PORCELAINCAPACITOR 50V 103 10 2 5mm C100 C101 0260019 CD CD11 16V10U 20 5x11 2 C103 C104 C105 LJ VV 2150164 FLAT CABLE NEEDLE DISTANCE MAGNETISM LOOP XP12 Womomowesooer Womomowesoner 6 11 P
52. AV2251 service manual Catalog Chapter One About Maintenance eee eee eee 1 4 Safety precatione 14 2 Precautions 1 1 3 About placement position 1 2 Maintenance _ ____________ _______ _________________ 7 150 eame uuu ee TS Re aie Co DUDAS 1 2 5 Cutting method en 1 2 5Cuttingmethod eee 1 2 6 Element substitution Et 1 2 7 Comparison method eee 1 3 Required device for maintenance deals di du api wae Chapter Two Operation amp 2 1 Control button locations and explanations eee 2 1 1 Front panel illustratlons meme 2 1 2 Rear panel illustration en 2 2 Basic operations remote control eee eee eene eene n DO ID 2 2 3 Select Input Sound Source e 2 2 6 Adjust 2 2 7 Adjust Level 2 77 7 2 2 9 Parameter Processing eee ae oe ee oe s a n en ann 11 2 2 TO Ad
53. CL21X100V224 K C5BD C213 C214 METAL POLYESTER FILMCAPACITOR CL21X 100V 104K C5 BELT C232 C233 02600019 CD CD11 16V22U 20 5x11 C5 BELT C119 C115 02102219 2101049 N N e e N cO cO 02600029 CD CD11 16V47U 20 5x11 C5 BELT C124 C125 C202 C207 CD CD11 16V220U 20 6x12 C5 BELT C134 CD CD11 16V100U 20 6x12 C5 BELT C142 C208 02601819 02601889 02603909 CD CD11 50V0 47U 20 5x11C5 BELT C240 131 100 101 132 215 217 CD CD11 16V10U 20 5x11C5 BELT C219 C221 C252 02604379 02604389 CD CD11 16V4 7U 20 5x11C5 BELT C113 C114 C118 C245 C249 DIODE 1N4004 BELT VD106 VD107 VD201 VD100 VD101 VD103 VD104 DIODE VD108 VD203 VD206 VOLTAGE REGULATOR DIODE 5 1V 5 1 2W BELT VD202 05700049 0570006 05800069 05800099 VOLTAGE REGULATOR DIODE 9 1V 5 1 2W BELT VD200 07800259 TRIODE 2ns4o1 BELT 07800329 TRIODE V102 V110 V111 V200 V201 V202 6 5 CPU BOARD 07801389 1564230 AV225T RU 5448201 CD11 16V10U 20 5x11 2 C111 C112 C114 C115 C139 CUT 118 121 124 127 130 133 136 109 110 MATERIAL NAME SPECIFICATIONS LOCATION CODE 0881227 RC4558P DIP N102 N103 N107 0880445 N102 N103 N107 000 0880124 IC NJM4558D DIP N102 N103 N1070 0000 0881393 IC IL4558N DIP Co 79 N102 N103 N1070 0000 0100008 RESISTANCE NETWORK 1 6W 4 7K 5 RR100 0970036 CERAMIC RESONA
54. ED PRODUCT AV225T RU 5448200 00000119 1 6W2200 5 BELT R158 R161 00000139 1 6W3300 5 BELT R242 00000179 1 6W5100 5 BELT R236 R273 00000199 1 6W6800 5 BELT R239 R274 00000229 1 6W1K 5 BELT R110 R109 R209 R211 00000269 1 6W2K 5 BELT R248 R252 R213 R215 00000279 1 6W2 2K 5 BELT R151 R152 00000309 1 6W3 3K 5 BELT R272 00000329 1 6W3 9K 5 BELT R247 R153 R167 R168 R169 R264 R111 R 00000359 1 6W 5 1K 5 BELT R207 00000369 1 6W5 6K 5 BELT R216 00000379 1 6W6 8K 5 BELT R270 00000389 1 6W8 2K 5 BELT R266 R139 R220 R222 R238 R253 R267 R 00000409 CARBON FILM RESISTOR 1 6W10K 5 BELT 268 R143 R162 R163 R224 R225 R2 27 R243 R265 R275 3580092 3870591 3026724 4000197 4000462 5448200 N 00000419 CARBON FILM RESISTOR 1 6W12K 5 BELT R271 R221 R137 R140 R124 R103 00000439 CARBON FILM RESISTOR 1 6W15K 5 BELT R232 R254 R226 R230 108 MATERIAL NAME SPECIFICATIONS LOCATION 00000449 CARBON FILM RESISTOR 1 6W18K 5 BELT R261 00000459 CARBON FILM RESISTOR 1 6W20K 5 BELT R202 R129 R218 00000599 1 6W100K 5 BELT 100V 473 10 SHAPED 5mm BELT 100V 473 5 SHAPED 5mm BELT 109 MATERIAL CODE MATERIAL NAME SPECIFICATIONS LOCATION TEMETAL OXIDE FILM RESISTORLENECAPACITOR 100 562 10 SHAPED 5mm BELT C225 0226 C242 0243 TEMETAL OXIDE FILM RESISTORLENECAPACITOR 100 562 5 SHAPED 5mm BELT 225 226 242 248 METAL POLYESTER FILMCAPACITOR
55. Format BMP About 1 Saving Images Select Falder Save 50 0 500 24 7 20 Mar 06 13 27 1 02 353kHz 49 3 Volume board capacitor C121 waveform diagram Tek Tria d Pos 0 0005 About 1 saving Images Select Folder TEKOOO2 BMF 50 0 500 us CHI mv 20 Mar 06 13 28 1 243kHz 4 Volume board capacitor C120 waveform diagram wl Len Trig d Pus 0 0005 Action File Format About 1 Saving Images Select Folder Save 50 50015 7 24 mV 20 06 13 23 1 03434kHz 5 Volume board capacitor C119 SL waveform diagram Tek BN Tria d Pos 0 0005 SAVE REL Action Save Image File Format Abnut 1 Saving Images Select Folder Save 004 500mw SOL us 1 01m 20 Mar 06 13 58 1 05143kHz 50 6 Volume board capacitor C118 SR waveform diagram Tek A Tria d I Pos 0 0005 SAVE REL Action File Format BMP About 1 4 Saving mages Select Folder Save 05 5 0mV 500 us CH1 1 01m 20 06 13 58 1 07256kHz 7 Volume board capacitor C117 SW waveform diagram Tek P Tria d Pos 0 0005 SAVE REC File Format BMP 1
56. ILM RESISTORLENECAPACITOR TEMETAL OXIDE FILM RESISTORLENECAPACITOR TEMETAL OXIDE FILM RESISTORLENECAPACITOR TEMETAL OXIDE FILM RESISTORLENECAPACITOR TEMETAL OXIDE FILM RESISTORLENECAPACITOR METAL POLYESTER FILMCAPACITOR CL21X100V334K C5 BELT C125 C126 C101 C104 C107 C108 C115 C132 C CD CD11 16V47U 20 5x11 C5 BELT 142 147 152 154 111 117 118 119 120 121 11 16V4 7U 20 5x11C5 BELT 122 129 130 133 134 135 1 02101439 100V392 10 C5 BELT C146 02101449 100V 153 10 C5 BELT C124 C127 02101489 100V 473410 SHAPED 5mm BELT C102 C103 C116 C131 C143 C153 C102 C103 C116 C131 C143 C153 02102209 100V 473x596 SHAPED 5mm BELT 02101599 100V 1031109 SHAPED 5mm BELT C145 02102239 100V 1034596 SHAPED 5mm BELT c1450 000 02101419 02600029 02604389 CD 38 136 137 05800459 VOLTAGE REGULATOR DIODE 6 8V45 1 2W BELT VD100 VD101 VOLTAGE REGULATOR DIODE 9 1V 5 1 2W BELT VD112 TRIODE 8050D BELT V106 PCB 2110T 1 6 3 SIGNAL DISPOSAL BOARD 05800099 07801389 1564153 lt gt T 20 gt AV225T RU 5448199 106 mk ee em 9P75 2 5 2 PIN WITH NEEDLE TOGETHER 2121561 FLATCABLE DIRECTION XP22 107 MATERIAL CODE MATERIAL NAME LOCATION HEAT RADIATION BOARD SELF TAPPING SCREW SELF TAPPING SCREW PCB SEMI FINISHED PRODUCT 8215 3 AV225T RU AI SEGMENT 5140201 POB SEMI FINISH
57. OWER BOARD 0260027 0260214 1940066 1980006 1980030 1564231 AV225T RU 5448205 2100003 CONNECTED CORDS F 0 6 SHAPED 7 5mm W14 W16 W17 W22 IGONNEGTEBGORBE FoS SHAPED tomm L104 W13 connection conos A SGII GII I TIIIISIISTTSI 9 III IAITTTUU 0000129 CARBON FILM RESISTOR 1 6W1K 5 SHAPED 7 5 R101 R102 0000137 FILM RESISTOR 1 6W10K 5 SHAPED 7 5 R104 R105 0000144 CARBON FILM RESISTOR 1 6W47K 5 SHAPED 7 5 R103 0000146 CARBON FILM RESISTOR 1 6W100K 5 SHAPED 7 5 R107 0000289 CARBON FILM RESISTOR 1 4W4 7K 5 SHAPED 10 R106 0000294 CARBON FILM RESISTOR 1 4W10K 5 SHAPED 10 R109 0000301 FILM RESISTOR 1 4W47K 5 SHAPED 10 R118 R120 0000302 FILM RESISTOR 1 4W51K 5 SHAPED 10 R116 R117 0000305 FILM RESISTOR 1 4W100K 5 SHAPED 10 R108 0000499 CARBON FILM RESISTOR 1W4 7045 SHAPED R 15x9 R111 R115 0000622 CARBON FILM RESISTOR 2W220 5 SHAPED R 20x8 R100 0200138 PORCELAINCAPACITOR 50V 10412096 5mm C122 0200174 PORCELAINCAPACITOR 50V 103 10 2 5mm C121 C112 C123 C126 118 pe wa _ was pe 119 MATERIAL CODE MATERIAL NAME SPECIFICATIONS LOCATION PCB 5100 5 6 12 REMOTE CONEROLLER 1564105 AV225T RU 5471647 0000599 FILM RESISTOR 1 6W1O 5 SHAPED 7 5 R800 0200062 PORCELAINCAPACITOR 50V 151 1095 2 5mm C801 C802 EMISSION PPE
58. Pressing the MODIFY button on the remote control can circularly selectthe euphonized voice NATURAL Full Fruity Bright and Ringing The MODIFY button cannot be selected when not inserting microphone 7 Wide Field When inserting microphone to sing Karaoke you may select to switch on off Karaoke wide field when the sound field is not wide 7 Wide Field When inserting microphone to sing Karaoke you may select to switch on off Karaoke wide field when the sound field is not wide Press the WF button on the remote control to display MIC WIDE ON which means Karaoke Wide Sound Field is switched on Press the WF button on the remote control again to display MIC WIDE OFF which means Karaoke Wide Sound Fieldis switched off The karaoke WF button cannot be selected when not inserting microphone NOTE If noise appears when adjusting Karaoke please refer to TROUBLESHOOTING for details 2 2 11 Tuning Function Auto Tuning One 1 Press INPUT button on the front panel remote control to select TUNER as the input sound source Front panel Remote control 2 Press BAND button onthe front panel or remote control to select receiving wave band Front panel Remote control MODE STEP E oo o Q 3 Press TUNINGA Y button on the front panel or remote control for above 5 seconds to au
59. R179 P ADINTO 5 0V waveform after signal being detected 56 Section Five Function Introduction to IC 3 5 1 function introduction to 4558 1 Description The RC4558 and RM4558 devices are dual general purpose operational amplifiers with each half electrically similar to the A741 except that offset null capability is not provided The high common mode input voltage range and the absence of latch up make these amplifiers ideal for voltage follower applications The devices are short circuit protected and the internal frequency compensation ensures stability without external components The RC4558 is characterized for operation from 0 C to 70 C and the RM4558 is characterized for operation over the full military temperature range of 55 C to 125 C 2 3 FEATURES Continuous Short Circuit Protection Wide Common Mode and Differential Voltage Ranges No Frequency Compensation Required Low Power Consumption No Latch Up Unity Gain Bandwidth 3 MHz Typ Gain and Phase Match Between Amplifiers Low 8 nVPlz Typ at 1 kHz Designed To Be Interchangeable With Raytheon RC4558 and RM4558 Devices PIN CONFIGURATION PIN No Symbol 3 5 2 function introduction to 2399 1 DESCRIPTION PT2399 is an echo audio processor IC utilizing CMOS Technology which is equipped with ADC and DAC high sampling frequency and an internal memory of 44K digital
60. TOR 24 576MHz G100 0960165 CRYSTAL OSCILLATOR 24 576MHz 49 U G100 0 0 D D 0960169 CRYSTAL OSCILLATOR 24 576MHz 49 S G100 LJ LH l 0390168 INDUCTOR 1000 10 0410 SHAPED 12 5mm L100 0390353 SMDMAGNETIC BEADS RH 357508 SHAPED 12 5mm L101 0000279 CARBON FILM RESISTOR 1 4W4700 5 SHAPED 10 R118 R119 METAL POLYESTER FILMCAPACITOR CL21X 63V 104 50 5 C137 VD102 VD103 VD108 VD109 VD110 0570006 1N4148 VD111 VD112 VD113 VD114 VD115 VD116 VD118 VD119 05800019 VOLTAGE REGULATOR DIODE 3 3V 5 1 2W BELT VD117 lt gt T 20 gt 05800059 VOLTAGE REGULATOR DIODE 4 7V 5 1 2W BELT VD101 05800459 VOLTAGE REGULATOR DIODE 6 8V 5 1 2W BELT VD106 VD107 0780025 TRIODE 2N5401 V103 0780032 TRIODE 9014C V101 V104 V102 V105 V100 0890283 PROGRAM CPU CPU225TRU 0 1850005 DUAL RANKIC SOCKET 40P DIP N100 5448209 PCB SEMI FINISHED PRODUCT 7228 1 SMD AV225T RU 0260547 CD CD11C 16V1U 20 4x7 1 5 C104 C108 0260548 CD CD11C 16V2 2u 20 4x7 1 5 C100 C103 1970073 DUAL FLAT NEEDLE 2x4 11 6 16 5 2 54mm STRAIGHT FLEX XP104 XP105 6 6 CPU BOARD SMD AV225T RU 5448209 0090004 SMD RESISTOR 1 16W 220 5 0603 R209 0090011 SMD RESISTOR 1 16W 4700 5 0603 R191 R192 R195 R208 R215 R231 0090014 SMD RESISTOR 1 16W 1 5 0603 RORA RTO 165 8170 177 0090016 SMD RESISTOR 1 16W 1 5K 5 0603 R122 R114 0090017 SMD RESISTOR 1 16W 2 2K 5 0603 R112
61. The working principle is as follows 1 After power on under the control of MCU internal program data signal is outputted to M62446 then M62446 sends out high low level to perform scanning to N101 N102 N103 each input port of volume board at the same time P SELECT is high level V102 is on now the in phase end voltage of comparator N103B is about 0 1V When these input ports have no signal output voltage of pin 6 of N103B is less than 0 1V pin 7 outputs 4 12V Vd103 is in reverse cutoff state Itis known from the above analysis P SEARCH is high level which means there is no signal input After all ports being searched once it enters standby state automatically when a certain port has signal input this signal is compared with pin 5 of N103B through N108B of volume board and MCU board N103A amplification if voltage of pin 6 of N103B is more than 0 1V pin 7 outputs 12V Vd103 is in positive direction on state now P SEARCH is low level which means there is signal input through controlling IC M62446 MCU locks this port that has signal input to enter normal playback 2 When pressing GOTO button on remote controller through remote control receiver on the panel the switch from light signal to electric signal is performed thus pin 11 of MCU sends out a high 296 Level to make V102in on state and search also according tothe above program 3 Spectrum analysis circuit 1 Spectrum analysis circuit is composed of auto spectru
62. Vc Vc and find that resistance is 0 ohm unplug power board flat cable holder XS8 shown as in the figure 3 3 1 3 test resistance to ground of power amplifier board Vc Vc it is also 0 ohm the trouble lies in power amplifier board by primary judgment test resistance in each pin of power amplifier board power tube V112 they are all 0 ohm resistance in each pin of power tube is 0 ohm V112 and V113 have been broken down change V112 V113 change fuse output is normal after power on again and trouble is removed C103 47u 100V R117 U R10 V112 er 2501047 144148 74 V114 C101 2N5551 4416 wu L 10u 16V V102 23555 R104 C104 47K 220p R10 4 3K 107 47 100 UVY 25 17 220 0 5W Figure 3 3 1 3 Power amplifier output circuit diagram Note when a certain channel has no output firstly confirm whether voltage of power amplifying circuit of each channel is normal We often test stage by stage from the final stage of signal output and then analyse Vibration exists in the course of moving machines the line of PCB board of signal board will probably be broken off or copper surface of element pin will fall off so you should consider when analysing problems Instance 4 Symptom microphone has no output Description insert microphone after power on that MIC input has been detected displays but microphone has no output Analysis and troubleshooting after power on insert microphone mi
63. al Any unused bus terminals during HIGH Z State must be held HIGH or LOW 4 PIN DESCRIPTION Side B Inputs or 3 STATE Outputs S763 Side B Inputs 3 STATE Outputs Output Enable Input Power Supply 3 5 19 function introduction to CD4094 1 Description The CD4094BC consists of 8 bit shift register and a 3 STATE 8 bit latch Data is shifted serially through the shift register on the positive transition of the clock The output of the last stage QS can be used to cascade several devices Data the QS output is transferred to a second output Q S the following negative clock edge The output of each stage of the shift register feeds a latch which latches data on the negative edge of the STROBE input When STROBE is HIGH data propagates through the latch to 3 STATE output gates These gates are enabled when OUTPUT ENABLE is taken HIGH 2 Features Wide supply voltage range 3 0V to 18V High noise immunity 0 45 VDD typ Low power TTL compatibility Fan out of 2 driving 74L or 1 driving 7415 3 STATE outputs 3 DESCRIPTION STROBE Store control DATA Serial data sw sm NENNEN e j j am NN NEN T NENNEN NN TB Chapter Four Disassembly and Assembly Process In order to know the structure of audio power amplifier AV225T easily visibly and quickly now
64. are low level these 5 channels all have normal output when headphone is inserted PH SW is high level now diode VD203 VD204 on signal board make the mute control signals P LRM and P CSM of main channel centre and surround channels be high level and make main channel centre and surround channels have no output on account of mute Please refer to mute circuit part for the principle At the same time triode V111 is made on through the resistor R166 on signal board so V110 and V109 are cutoff to cut the power supply loop of fan when volume is more than 45dB fan tunning is forbidden to facilitate to listen with headphone Please be noted here that headphone detect signal SW is not connected with MCU but is set by machinery structure of headphone jack 3 2 8 Video in out board circuit AV225T RU is with two channel composite video input VCD DVD or 5 1CH and one channel composite video output VCD DVD or 5 1CH Input video switch of video signal is realized through a electronic switch CD4051 N101 the truth value table is shown as follows _ When select VCD channel pin 1 and 2 of 106 M62446 of volume board sends out two control signals of A and B and one INH control signal A 1 B 0 INH 0 known from Cd4051 truth value table that output pin of CD4051 pin 3 selects X1 ie VCD channel now in terms of volume board working principle in section 2 A and B also control gating of audio part
65. ase electrode outputs low level V107 V100 are cutoff SW signal outputs to external terminal normally at the same time BURST high level signal is added to emitting electrode of V108 V108 is on collector electrode output high level is added to the base electrode of V101 V101 is on to make SW signal grounding and it will not be overlapped to left and right channel signals Reversely when BURST is low level V100 is on SWM signal cannot output from external terminal at the same time V101 is cutoff SW signal is overlapped to left and right channel signal Bass enhancer of AV225T RU is divided into 3 levels the principle is to change the high low of bass enhancer level through changing SW output volume of M62446 Meanwhile SWM signal is added to relay through XS9 when relay is disconnected SWM signal is grounded to make subwoofer terminal have no output to avoid the concussion to speakers at the moment of power on 3 5 1 signal and Karaoke signal mixed amplification circuit Left and right channel signals of 5 1 signal after being mixed with SW signal and being amplified by N101B N100B are sentto the reverse end of N101A N100A atthe same time OK R OK L signals are respectively added to the reverse end of N101A N100A and then output from pin 1 of N100A N101A to power amplifying circuit for amplification after the mixed amplification of N101A Meanwhile the centre C 1 signal sent from volume board is added to the pin 6
66. ation Adjust button Adjust level and multi band EQ EQ button Circularly call the preset EQ modes amp AUTO EQ button Analyze the currentsignal spectrum automatically set EQ parameters e 6 6 VOLUME button Adjust the karaoke level with A Wkeys ECHO button Adjust the karaoke ECHO with A V keys VOICE MODIFY MODIFY button Select Karaoke voice modify WF button Karaoke wide sound field On Off 7 TONE button Adjust the karaoke BASS Treble tone levelwith A V keys DELAY button Adjust the karaoke delay time with A V keys MASTER VOL button Synchronously increase decrease 6 channels volume BAND button Select FM AM tuner band MODE button Select tuner mode manual auto STEP button Select AM tuning step 9K 10K MEMORY button Memory the received radio station with the help of number buttons 0 9 CLEAR button Clear the preset radio station with the help of number buttons 0 9 TUNING b Scan other frequency radio station upwards TUNING 44 Scan other frequency radio station downwards PRESET pl Select the latter preset radio station PRESET Select the previous preset radio station NUMBER 0 9 Save the received radio station programs or directly call the preset programs with the help of MEMORY button 2 2 BASIC OPERATIONS 2 2 1 TURN ON OFF THIS UNIT Please check the connection cords before turning this unit on all connections are correct you
67. cking the welding point of N100 remote control receiver we found that pin has rosin joint after adding tin remote control is normal and trouble is removed Note buttons function and remote control function are all fulfilled by infrared receiver when buttons and remote control have no function trouble may lie in remote control receiver Instance 9 Symptom Microphone has no delay and echo Description after power on insert microphone set echo and delay in maximum beat microphone and there is no echo and no delay Analysis and troubleshooting test pin 7 of signal board N204 there is no signal test power supply of N209 PT2399 itis normal change PT2399 trouble is not removed test resistance of signal board capacitor C242 C243 C238 we find that resistance of C243 only has 2 5K change capacitor C243 and trouble is removed Note no echo and delay for microphone is caused by abnormal working of Pt2399 one case is that PT2399 is abnormal itself the other is that PT2399 peripheral circuit has trouble Porcelain capacitor in peripheral circuit is easy to damage 40 3 3 2 Troubleshooting process 1 Symptom Karaoke has no sound Analysis for this kind of trouble you may usually adopt signal injection method to check stage by stage If a certain stage does not give out disturbance sound this stage has problem this method is generally preformed from back stage to front stage Another is signal control method Check stage by
68. crophone inputs sine wave signal shown as the figure 3 3 1 4 test base electrode of signal board triode V105 itis low level MIC mute signal is normal test signal board capacitor C245 C246 they both have no signal test pin 7 of signal board N202 there is no signal considering that MIC input can be detected test signal board 38 Capacitor C219 there is signal power supply voltage of N200 is normal the trouble lies in N200 PT2315 by primary judgment change 2315 and trouble is removed 12V R204 C20247u 16V N200PT2315 100 0 25W 20 561 REF CLK __19 ____ _ ____ VDD DATA AGND DGND 18 TREBL LOUT TREBR ROUT 16czz RIN BOUT_R I5 T LOUD_BIN_R 14222 NC BOUT L 13 IBIN L 12 NC LIN 1 C200151 R20039K R2075 1K 10u 16V MIC1 GND GND MIC DET R2091K 1N4148 Figure 3 3 1 4 MIC circuit diagram Note when changing PT2315 microphone still has no output sometimes Considering that PT2315 and N101 24C02 of CPU board commonly use P_DATA and clock line P_SCL when 24C02 is abnormal the communication between CPU and PT2315 may probably be affected to cause no output for microphone so 24C02 isrequired to change sometimes Instance 5 Symptom no sound output Description signal input may be detected after power on but no signal output no output when switching various sound sources Analy
69. crystal reset Microphone detecting input PE Liquid crystal read control bit 9 P ADSELA Selection spectrum sampling control A 63 5 P ADSELB Selection spectrum sampling control B 6 P ADSELC Selection spectrum sampling control C 7 9 Spectrum gain control B RST RESET System reset o o wana 2 1 wenmeemene 5 4 9 P CHARGE Spectrum sampling discharge control 29 P_DIST Distortion detecting 6 m P SEARCH Mute input detecting 9 sampling XTAL2 Crystal out Crystal out XTAL1 Crystal in Crystal in o gt m GND o Puma uman 5 uama lt e Per s o mm _ 6 Relay state input 7 P GNA Selection spectrum sampling control A AL m PO PO 3 5 7 function introduction to PT2308 1 DESCRIPTION PT2308L is a Class AB stereo headphone driver chip utilizing CMOS Technology specially designed for portable digital audio applications It is housed in 8 pin DIP or SO package and is functionally compatible with TDA1308 Pin assignments and application circuit are optimized for lower cost effectiveness and easy PCB Layout 2 FEATURES CMOS Technology Low Power Consumption Wide Temperature Rang
70. ctthe GND terminal The better grounding method is insertthe metal poleinto wet ground 2 2 12 Other Operations 1 Mute Mute the sound to make your conversation or answering telephone not be affected by music Press the MUTE button on the remote control to mute the sound and the display MUTE flickers 2 Child Lock To prevent the children wrongly pressing the front panel buttons you may lock the buttons on the front panel Press the CHILD LOCK button on the remote control to display LOCK The buttons on the front panel are invalid and now LOCKED displays Press the CHILD LOCK button on the remote control again to display UNLOCK the fronta pnel buttons can be normally used CHILD LOCK Child lock 3 Display To make the display spectrum colorful we have set many kinds of spectrum display means You may press the DISPLAY button to select After switching on the unit it will automatically select a kind of spectrum display mode every third moment or so Pressing the DISPLAY button on the remote control can cancel auto switch and select your favorite display mode Pressing the DISPLAY button on the remote control repeatedly can select many kinds of spectrum display effects until auto switch 16 The DISPLAY button cannot be selected when no signals input DISPLAY
71. e Excellent Power Supply Ripple Rejection High Signal to Noise Ratio S N 110dB Low Harmonic Distortion THD 0 001 Large Output Voltage Swing Low Supply Voltage Available VDD 2V 3 DESCRIPTION o maa s o FFn o 65 3 5 8 function introduction to PT2222 1 DESCRIPTION The PT2222is remote control transmitters utilizing CMOS Technology specially designed for use on infrared remote control applications is pin to pin compatible with NEC uPD6122 respectively PT2222 is housed in 24 pins so and capable of controlling 64 function kens and 3 double keys PT2222 may be paired with PT2225to construct a powerful remote control system 2 FEATURES CMOS Technology Low Power Consumption Vdd 2 0 5 5V Pin to Pin Consumption with uPD6122 Using SEL pin PT2222can support 128 6 function codes Customer Code can be selected please contact for details 3 PIN DESCRIPTION SEL GND o am VSS EN VSS a 66 KI O1 Keyboard line control KI O0 KES Keyboard matrix line control 22 CCS Address code control 23 K10 Keyboard matrix row control 24 K11 Keyboard matrix row control 3 5 9 function introduction to LM1875 1 Description The LM1875 is a monolithic po
72. e positive negative power pins 4 Protection circuit Protection circuit of AV225T RU power amplifier is on power board Protection means of L R C channel is through disconnecting relay Y100 when protection starts up to disconnect its output SR SL channel fulfils the protection function through mute AV225T RU is with power on delay protection central point over voltage and over current protection standby protection 1595 1 Power on delay attracting protection circuit when power on working of circuit is stable and the produced current has great damage to speaker and power amplifier so delay attracting protection circuit is set Power on delay attracting protection circuit is divided into 2 steps 1 C L R channel working process the AC outputted from transformer through rectification filtering of Vd113 C110 gets 22V voltage to make VD111 reverse broken down through charge to C115 by R108 to make Vd111 reverse broken down to make V105 V104 positive direction on to make relay Y100 attracting to realize delay attracting effect SR SL channels performs concussion protection when power on off through the following means after machine system resets MCU outputs a P_CMS high level signal to make V150 on and make V151 cutoff pin 5 of TDA7265 is power voltage TDA7265 outputs mute After delay start up of machine succeeds the output signal P_CMS of MCU switches into low level immediately V150 is cutoff to make V151 on voltage
73. ector tube is normal whether each channel power is short circuited to ground Change the burnt out protector tube Check the voltage regulation capacitor of short circuited power whether voltage of power board XP8VC and VC is normal 4 35V whether 20 of power amplifier board is normal whether 5V of signal board is normal Check the load circuit of this channel power Check whether AC output of eachsublevel of transformer is normal Change transformer Figure 3 3 2 8 Troubleshooting flowchart for Powernot on 48 Section Four Servicing Parameters 3 4 1 Signal waveform diagram This section collects signalwaveform diagram of audio video and each unit circuit with the purpose of helping servicing personnel to judge where the trouble lies accurately and quickly to promote their servicing skills Because of the difference of oscillograph brand model and tuning the servicing personnel should pay more attention to check in daily work for some difference may exist 1 Input signal 2 channelinput waveform diagram Tek JL Tria d Pos 0 0005 SAVES AEC x Action save Image File Format EMP About 1 saving Images select Folder Save 50 0mm SOD us CH1 24 mV 20 06 13 25 1 0082 4kHz 2 Volume board capacitor C122 L waveform diagram Tek sn Trig d Pas 0 0005 SAVE REC Save Image File
74. ed by feedback resistor R130 and N104 electronic switch When main volume is too high through the control of MCU N104 increases the resistance value of grounding resistor automatically and 27 Decreases the amplified multiple when main volume is too small N104 decreases the resistance value of grounding resistor automatically and increases the amplifies multiple 3 Frequency point gating circuit the signals after being amplified by N105C through C115 coupling are sent to the 7 bandpass filters composed by operational amplifier the corresponding frequency range can be confirmed through setting the capacity of its feedback capacitor On the output end of each filter a half wave rectification circuit is connected through rectification filtering to the AC signal after being amplified DC voltage is achieved This circuit is mainly to realize frequency point sampling function which canrepresent the range of each frequency point ina complete sound signal If the low frequency part in sound signal is strong the DC voltage on the output terminal of 35HZ 100HZ filter will be higher similarly when high frequency part is strong the DC voltage on10K 16K filter will be higher The output terminal of this 7 filters is connected to 7 input terminals of electronic switch N108 Cd4051 to make this electrtonic switch quickly and circularly gating in each frequency point On the output terminal of pin 3 of N108 will output a series voltage values tha
75. ed of V202 When microphone is not inserted it is low level V202 cutoff when microphone is inserted it is high level V202 is on now turn off scene surround mode and forbid tuning Otherwise there is OK auto mute function When P KT cannot detect any signal in a continuous period MCU will send out a control signal to make KM be high level triode V103 V105 V104 is on to mute OK signal to advance SNR of the player and better listening effect 4 Scene mode signal flow AV225T RU has a special function that is it may realize switch 5 kinds of scene mode when there is no Karaoke which is fulfilled by Karaoke part Signal flow chartis shown as inthe figure 3 2 2 2 gt _ N209 N207 s N208 Mixed output Figure 3 2 2 2 Scene mode signalflow chart When pin 9 and 10 of N205 is in high level the sampled L R C signals are outputted by pin 3 through N205 gating after being amplified by N203B one path is sent to PT2399 inside for echo and delay adjustment controlled by IC CD4094 the effect after adjustment is overlapped to L R C channel _ 24 form various scene modes Seen from this its principle is the same with that of Karaoke In scene mode it functions only when microphone is notinserted and in 5 1CH mode at the same time 2 Bass enhancer circuit BURST sent out by N210 is bass enhancer on off signal When it is high level it is added to base electrode of V102 V102 is on b
76. elect Folder Save TEKOO12 BMF 2500mw 50015 20 Mar 06 20 02 dEHz 13 Outputto flat cable XS8 after power amplification pin 1 L waveform diagram Tek MIM Tria d Pos 0 0005 SAWE REC File Format BMP About saving Images U Select Folder Save 3 5 00 500 us 1 5mv Current Folder is 4 5 Action 14 Outputto flat cable holder Xs8 after power amplification pin 2 waveform diagram Tek s Tria d Pas 0 0005 REL Action save Image Fil amp Format 1 saving Images Select Folder Save 4 5 008 us CHI 105 20 06 20 04 313 145Hz 253 15 Outputto flat cable holder XS8 after power amplification pin 3 waveform diagram Tek Tria d 0 0005 Action 1 4 Saving Images Select Folder TERKOO15 BMP 5 004 500 us CHI 7 105m 20 Mar 06 20 04 373 115Hz 16 Outputto flat cable holder XS8 after power amplification pin 4 SL waveform diagram Tek vol Lew Tria d Pos 0 0005 SAVES REC About HSN SON LN SNL Saving Images select Folder Save 6 5 004 us 1 05mVv 20 Mar 06 20 05 1 17 Outputto flat cable holder XS8 after power amplification pin 5 SR waveform diagram Tek Tle Pos
77. er surround mode MUSIC button OTP button to setstandard concert mode K R OK OTP button to set standard Karaoke mode HI FI button Select the Hi Fi sound field STANDARD button Select the standard sound field CYBER LOGIC button Select the cyber logic sound field BASS ENHANCER button Select the bass enhancing effect lt ANDBY D O gs 7 s 3 7 SPEAKERS CHILD LOCK DEFAULT 1 2 5 e KARAOKE VOLUME ECHO MODIFY VOICE MODIFY DELAY WF VOL BE BAND MODE STEP TUNING 9 9 009 006 225 Number buttons 1 8 Select 8 preset working modes with the help of SAVE CALL button capable ofstoring and calling the user set workingmode parameters SPEAKERS button Adjust the separate channel level with the help of A V keys CHILD LOCK button Lock the functions of the front panel controls SURR Button Select the surround sound field DEFAULT button Restore the factory default settings SAVE button Store the current working mode parameters with the help of number buttons 1 8 CALL button Call the user stored working mode parameters with the help of number buttons 1 8 EQ select button Select the equalization frequency MULTI BAND EQbutton Adjust multi band electronic equaliz
78. ge on C137 and makes the in phase end of N102B begin the process of 100Hz charging from O level When 100Hz charging finishes switch into the charge discharge process of the next frequency point and this kind of process circles continuously under the control of MCU This period of charge from 0 level to the point that turn over happens stands for the signal range of the current frequency point The range is larger time is longer and range displayed on screen is higher the range is smaller time is shorter and range displayed on screen is lower The digital pulse outputted from the outputterminal of N102B addsto pin 12 of MCU through V105 phase MCU handles it and outputs to panel and makes dynamic spectrum display on display screen Originally speaking the display of each frequency point performs one by one according to the sequency for the above circulation process is fast on the screen we will see the process of a whole spectrum displays Shown as in the figure 3 2 3 3 the charge time parameter is frequency point signal range voltage value cyclic parameter in the figure 3 2 3 2 V V 100HZ High level discharge Frequency point signal range voltage 35HZ q yp 9 9 9 value switches into time interval T Switch time interval Charge time Charge time Figure 3 2 3 3 Illustration of Frequency point signal range voltage value switches into time interval 3 2 4 Control panel circuit Front panel control circuit is the window of man mach
79. hat the trouble lies in this level 1 2 6 Element substitution method When some elements cannot be judged good or bad substitution method may de adopted directly 1 2 7 Comparison method A same good PC board is usually used to test the correct voltage and waveform Compared these data with those tested through fault PC board the cause oftroubles may be found Through the above maintenance method theoretical knowledge and maintenance experience all difficulties and troubles will be readily solved 1 3 Required device for maintenance Audio Generator Digital oscillograph 100MHE SMD rework station Multimeter Soldering iron Pointed month pincers Cutting nippers Forceps Electric screw driver Terminals connecting cord Headphone Microphone Chapter Two Operation Instructions 2 1 CONTROL BUTTON LOCATIONS AND EXPLANATIONS 2 1 1 FRONT PANEL ILLUSTRATLONS HH HOME THEATRE RECEIVER AV225T 9 POWER SWITCH Power on off this unit OLCD Screen Buttons operation indication and spectrum display when working IR sensor Receive the infrared signals transmitted from the remote control MASTER VOLUME Press this button to synchronously lower all 6CH volumes INPUT Sound source input button MIC VOLUME Press this button to increase the volume of MIC MIC VOLUME Press this button to lower the volume of MIC O TUNING 4 Select other frequency radio stations upwards
80. he front panel to power off this unit HOME THEATRE RECEIVER AV225T STANDBY STANDBY ANDBY 1 2 8 4 5 7 SPEAKERS CHILDLOCK DEFAULT SURR 18 MULTI BAND EQ 2 2 2 function We have set the OTP function to simplify the operation of testing sound effects If the played disc is movie or story you just press the MOVIE button and the system will automatically set standard movie mode If the played disc is music you just press the MUSIC button and the system will automatically set standard music mode lf you want to sing Karaoke you just press the K R OK button after inserting microphone and The system will automatically set standard Karaoke mode Press the MOVIE button to set standard theater surround mode Automatically detect the input signal source If many signal sources input it will select the current signal input preferentially Automatically set the parameters of surround If 5 1CH input signalis detected it will automatically adopt standard mode if 2CH signal source is detected it will automatically adopt Cyber Logic Press the MUSIC button to set standard music modeAutomatically detect the input signalsource If many signal sources input it will selectthe current signal preferentially Automatically set the parameters when enjoying music If 5
81. he low frequency of music you may start up Bass Enhancer function Press the BASS ENHANCER button on the front panel or remote control BASS driver O BASS driver 1 BASS driver 2 or BASSdriver 3 will display The display BASS driver 1 3 means the first second and third Bass Enhancer the subwoofer signal adds into the master channelsignal turn off the subwoofer line output The display BASS driver 0 means turn off Bass Enhancer normal subwoofer line output Bass Enhancer function cannot be started up in Hi Fi mode BASS ENHANCER Bass Enhancer 2 2 5 Select Sound Field 1 HI FI In 2CH signal input you may select the Hi Fi mode to keep the originally musical features Press the HI FI button on the remote control and HI FI will displays which means the system enters the Hi Fi mode if NVALID displays it means the system cannot enter the Hi Fi mode Bass Enhancer function and operations related to EQ are invalid in Hi Fi mode Pressing the HI FI button is invalid in 5 1 input 2 Standard In order to keepthe correspondence with input signals and adjust outputtimbre according to personal habit you may select the standard sound field Press the STANDARD button on the remote control and STANDARD will display which means the system enters standard sound field
82. ied of N203B is divided into two paths one path outputs directly and the other path is coupled byR222 C247 to PT2399 inside for delay and echo adjustment and then outputs from pin 14 and then mix output 55 Together with direct connection OK signal through N204B while OK R is outputted from pin 14 after being gated by N205 and then overlapped to left and right channels In this circuit the low frequency exalt network composed by triode V201 connected to the reverse end of N202B is mainly to exalt 75HZ low frequency signal When performing delay adjustment to PT2399 firstly give control signal to MCU and MCU controls N207 after being extended by N211 IC CD4094 then selects different resistance value to connect into pin 6 of PT2399 to reach the purpose of delay adjustment Similarly through changing the resistance value in R229 to change the echo level overlapped to direct connection signal the echo adjustment is realized The wide sound field control signal of Karaoke is sent by N211 to pin 11 of N205 when it is high level pin 14 of N205 is connected to X1 now the phase of OK R signal is reverse from that of OK L sound field is widened and Karaoke is in wide sound filed state On the contrary the phase of OK R signal is the same with that of OK L Karaoke is in the narrow sound field state In addition microphone plug has a detect signal P MICDET and it composes the detection to microphone inserting together with the circuit compos
83. ine conversation of the player and it can transmit various operation instructions to MCU to fulfil various operation At the same time it is also a window of the player Users control the working state of the player through it and it is also an important composition of the appearance Control panel circuit block diagram is shown asin the figure 3 2 4 1 LCD display receiving Figure 3 2 4 1 Control panel circuit block diagram 29 1 Power supply circuit Control panel power supply of AV225T RU has two groups voltage of 3 3V and 5V The 5V voltage from signal board after voltage regulating supplies power for N102 N103 74VHC245 N101 PT2222 respectively through the voltage reduction of three diode VD105 VD106 and VD107 2 LCD display drive and buttons circuit This circuit is composed of N101 N102 N103 and LCD The display is directly controlled by PO port of MCU LCD is banded with IC inside For working voltage of display screen is 4 3 3V but the control line level sent out by MCU is 5V between MCU and LCD display screen two IC 74 VHC245 are used to perform level conversion to change the 5V control level from MCU into 3 3V control level to control the display of display screen Buttons circuit of this player is equal to a remote controller Signal of buttons matrix is received by 2222 and then makes infrared light emitting diode VD100 send out signal through the control of triode gating by pin 7
84. ing output circuit 9 Video input and output board fulfil the switch of VCD DVD channel 3 1 2 Function and features Built in 50 power amplifying applicable to AC 3 DTS and stereo music replay Main channel 80W central surround 15W with strong power AC 3 DTS VCD DVD input jack and subwoofer output jack 6CH volume control and separate level control with 7 band electronic equalization Bass enhancer system Cyber logic function and Hi Fi playback function Q play function of movie music and Karaoke Multiple EQ modes applicable to different music styles Auto spectrum analysis compensation function performs compensation to signals automatically Complete Karaoke function including separate MIC volume control high low tone adjustment voice compensation delay and echo adjustment Karaoke wide sound field function 3 1 3 Player block diagram The player block diagram is shown as the following figure 3 1 3 1 Signal output XL100 7 Power board Transformer elementary SWITCH Transformer Sublevel coil Revo oven pJeoq JeNod Control panel SR1 I DL e XS23 TT 68 BE XS6 MIC DET GND MIC1 Figure 3 1 3 1 Player block diagram 18 3 1 4 The player signal chart The player signal flow chart is shown as the following figure
85. it by using CLEAR button on the remote control with the help of number buttons 0 9 1 Press CLEAR button onthe remote control 2 Press the serial number of the radio station that you want to clear in the course of the screen s displaying CLEAR to finish this operation Remote control NOTE 1 This operation is beyond retrieve so please take care to operate 2 If you clear the radio station incautiously you may save again according to the select operation The Explanation of MODE button This unit has two working modes in the receiving status AUTO MANUAL 1 In AUTO working mode if you select FM wave band this unit will automatically recognize the radio station program is mono signal or stereo signal and keep the mono or stereo receiving status 2 If the received radio station program has louder noise or cacophony in stereo status you may switch to MANUAL working this way the unit is in mono receiving status to decrease noise and cacophony generally You may switch the two working modes through MODE button on the remote control Remote control Antenna Connection Youmay use our accessional AM and FM indoor antenna when in bad receiving effect Generally speaking these antennae can supply enough signal strength Connect to AM Round Antenna 1 Push the jack button to open it Push the jack button to open it 2 Connect the AM round antenna cord to
86. itor C133 C134 no signal test volume board capacitor C122 C121 also nosignal pin 5 and 14 of N101 have signal test power voltage of pin 7 and8 of N101 normal it is known primarily that N101 has input but no output change N101 and N101 still has no output after changing so it is judged that N101has no problem itis that A B signal of N106 have trouble when this channel has not been selected change N106 output is normal after changing and trouble is R153 154 R155 R156 22K 22K 22K 22K removed N101 CD4052 15 X2 5 1CH R11 X3 C14 C142 47n 47u 16V L vcD L 5 Y1 DVD L 2 Y2 B 1CH L 4 vDD I jA 6 8V INH 5 VEE a 6 8V gt A L101100uH OUT4 DVDD OUT3 CLK OUT2 DATA OUT1 LATCH C141 C140 c139 a 101 101 101 N102 CD4053 SWIN AGND D 1 1 1 C115 47u 16 47n R157 1106 5 0 12 4 c13dll4 5 1CH C13 GNDS M62446 swour 38213 C131 4 7u 16V5R1 SRIN 2891447 36 4 3 S SR 2 vg Y 5 1CH SR1 C1 7u 16 6L1 ttt suey SUN BI 5 51 4 0 C1 4 7u 16 C 1 A 6 8V H 5 5 1CH SL3 C134 4 7u 16 R 1 164 He CIN po vss H GNDR Lour Leti jezen 5 1CH 0 B AVSS A 6 8V VEE
87. just Karaoke ete 12 2 21 Tuning FECE 13 2 2 12 Other Operations 15 Chapter Three Principle and Servicing lt lt 17 Section One Prnelple ofthe ee er ete 17 3 1 1 Composition of the player eee 17 5 Eae RI EIE ECL CO LL VIL 17 3 1 3 Player block diagram emere 18 3 1 4 The player signal flow chart Hee eene 19 Section Two Unit Circuit Principle mee eee eee 20 20 3 2 2 Signal processing board circuit eene 23 ET 25 3 2 4 Control panel circuit eene 29 CRON SH 30 3 2 6 Power amplifier board and protection circuit 31 3 2 7 MIC headphone board eee eee eene nennen 34 3 9 8 AVG eh waki 34 Section Three Servicing Cases eee 26 3 3 1 Servicing instances eese eee emere 36 3 3 2 Troubleshooting process seen eene 41 Section Four Servicing Parameters eee eee 49 3 4 4 Signal waveform diagrami 49 3 4 2 Key point voltage 56 Section Five Function Introduetionto 57 3 5 1 function introduction to 4558 ____________________ ____ __ 57 5 PR28990 58 5 5 tupan introduction 59
88. l 1 AV225T RU Karaoke circuit 1 Function this circuit is to reset by loudspeaker after handling voice and being amplified by power amplifier It includes voice beautification circuit wide sound field processing circuit and 5 echo and delay adjustment circuit 2 Function of IC of Karaoke circuit is shown as the following table IC SN IC function IC SN IC name IC function N201 4558 N207 CD4051 delay adjustment preamplification to voice signals N200 PT2315 N208 1 04051 echo adjustment including tone adjustment N205 Electric swich 4558 N209 PT2399 Karaoke echo settlement 3 Karaoke signalflow chart N100 Figure 3 2 2 1 Karaokesignal flow chart Shown as in the figure 3 2 2 1 when microphone is inserted MIC signal is sent to N201A operational amplifying circuit for amplification One path of MIC signal after being amplified gives MCU a microphone input identification signal P OKT through VD201 rectification filtering control triode V200 after being amplified by N202A when there is signal input P OKT is low level MCU makes N210 CD4094 send out KM low level signal to make triode V103 V105 V104 ccutoff and then to make MIC signal can output the other path is coupled by C219 to pin 6 of PT2315 and then output from pin 16 after internal volume adjustment to N202B and N203B for amplification The signal after being amplif
89. lboard and rearcover and board then take downsignal board 80 11111 001111 11 Use electric screwdriverto unfix screwsA D inthe point position of bottomcasing and poweramplifier board heat radiator andscrew E inthe joint place with rear cover W 4 7 7 lt 13 Pull downflat cable B D on power board i 15 Use electricscrewdriver to unfixscrews A Dof power board and thentake down powerboard 81 E a 12 Use electricscrewdriver to unfixscrews A B and Cof power amplifier board and then takedown power amplifier board ad 14 Use electric screwdriver to unfixscrews A Din the joint place ofrear cover andoutput terminal ofpower amplifier output board power board and power amplifier output boardare both inone E 16 Use electricscrewdriver to unfixscrews on twosides of panel 17 Use electricscrewdriver or shaped screwdriver to unfix screws in thejoint place ofpanel and bottom casing oU i 19 Use electricscrewdriver to unfixscrews of paneland MIC board andthen take down PCB board 2 Assembly process for whole unit 7 gt 1 Install panel MIC board anduse electric screwdriver to fix screws
90. ll automatically check the parameter saved ast time when switching on this unit When the channel level is too high or too low the system will adjust automatically Call Default Parameter Call Parameter Memory Parameter 1 2 2 10 Adjust Karaoke 1 Microphone Volume When inserting microphones to sing Karaoke press the MIC VOL button to adjust the volume of microphonewhen the microphone voice is too high too low or unsuitable Press the A button of MIC VOL on the front panel to increase the volume of microphone The maximum volume is 30 Press the button of MIC VOL on the front panel to decrease the volume of microphone The minimum volume is O Press the VOLUME remote control then press to adjust karaoke volume The microphone volume displays as MIC VOL 20 The microphone volume cannot be adjusted when not inserting microphones 2 Bass When inserting microphone to sing Karaoke you may adjust microphone bass when the sound tempo is not full or rich Press the button on the remote control once then press A V to adjust the bass of microphone The adjustable range is 6 The microphone bass displays as MIC BASS 2 The microphone bass cannotbe adjusted when not inserting microphone 3 Treble When inserting microphone to sing
91. lume on the front panel or remote control to increase all channels volume simultaneously the max volume is 60 Press the button of master volume on the front panel or remote control to decrease all channels volume simultaneously the min volume is O The master volume displays as the example VOL 20 MASTER VOL MASTER VOL Volume Adjustment 2 2 7 Adjust Level 1 Left channel level When sound of left and right channels is imbalance you may adjust R channel level to make it in balance with L channel Press the SPEAKERS button on the remote control and L 00 will display Operate as follows Press the A button on the remote control to Increase the volume of L channel The max level is 60 Press the V button on the remote control to decrease the volume of L channel The min level is 60 2 Right channel level When sound of left and right channels is imbalance you may adjust L channel level to make it in balance with R channel Press the SPEAKERS button on the remote control and L 00 will display Operate as follows Press the A button on the remote control to Increase the volume of L channel The max level is 60 Press the V button on the remote control to decrease the volume of L channel The min level is 60 3 Center level When sound of left and right channels is imbalance you may adjust R chan
92. m gain adjustment circuit frequency point gating circuit A D conversion circuit and display output circuit shown as in the following figure 3 2 3 1 N105C 35HZ DISPLAY B gt 134HZ gt 300HZ N108 MCU N1043 gt 1KHZ CD4051 res gt 2 2KHZ Auto spectrum Gain adjustment 6 3KHZ point gating 3 gt 16KHZ N102A A D conversion i V 105 Pin 12 ofMCU Pee Figure 3 2 3 1 Spectrum analysis circuit 2 Auto spectrum gain adjustment circuit in order to avoid the two conditions that when input signal is too weak screen display range is too low or when input signal is too strong full screen will appear AV225T RU has set auto spectrum gain adjustment circuit and adopted a single channel 1 selected from 8 electronic analog switch N104 CD4051 with its truth value table shown as follows e ps D e D Ds Ds EXENENENK Through changing the resistance value of reverse end grounding resistor of operation amplifier N104 gain of the operation amplifier is changed See the details of the working of the entire circuit The spectrum analysis signal source DISPLAY mentioned above is sent to the in phase input terminal of operational amplifier N105C for amplification and its amplified multiple depends on the ratio of the resistor connect
93. n sound of surround right is unsuitable you may adjust surround right level to make it suitable to the sound field Press the SPEAKERS button on the remote control and SR 00 will display Operate as follows Press the A button on the remote control to increase the volume of surround right The max level is 60 Press the YW button on the remote control to decrease the volume of surround right The min level is 60 NOTE The surround right level cannot be adjusted only when leftand right channels have output 6 Subwoofer level When sound of subwoofer is unsuitable you may adjust the volume of subwoofer speaker and the level of subwoofer channel to make it balanced to the sound field Press the SPEAKERS button on the remote control and SW 00 will display Operate as follows Level Adjustment Press the A button on the remote control to increase the volume of subwoofer The max level is 60 Press the V button on the remote control to decrease the volume of subwoofer The min level is 60 NOTE The subwoofer level cannot be adjusted only in Hi Fi and Bass Enhancer conditions 2 2 8 EQ function Due to the personallike to music you may adjust EQ to meet yourown needs If the music tempo is not enough orfull adjust bass ifthe voice is unclear adjust middle frequency if the musical details are notrich adjust treble 1 Pre set EQ Whe
94. n the sound of master volume is too weak or unclear you may directly use pre set EQ mode to make itaccordant with the current music This unit utilizes 8 EQ modes Rock Jazz Classical Pop Disco Rap and Blues Press the EQ button on the remote control to display the EQ curve Press the EQ button repeatedly to select the EQ mode accordant with the current music EQ mode cannot be adjusted in Hi Fi mode 2 Multi band EQ When the sound of master volume is too weak or unclear you may set EQ mode yourself to meet you own taste Press the AUTO EQ button on the remote control to display the current EQ curve There is a cursor flashing the current frequency Press the gt button on the remote control to select the high frequency The flashing cursor moves rightwards until the rightmost Press the lt button on the remote control to select the low frequency The flashing cursor moves leftwards until the leftmost Press the A button on the remote control and the current frequency level increases until the maximum Press the button on the remote control and the current frequency level decreases until the minimum EQ mode cannot be adjusted in Hi Fi mode 3 Auto EQ When the sound of master volume is unsuitable to you listening you may select auto EQ The unit will automatically analyze the current spectrum to set the current EQ according tothe current music
95. ndling mode in input circuit is show as the following figure 3 2 1 2 3 Dd Only L R channelhas output sound field andEQ setup is invalid Only L Rand SW channel has output capable of performing sound fieldand Standard mode EQ setup 6CH output capable of Cyber logic mode performing cinema sound field and EQsetup 2 kinds ofanalog input modes Press INPUT button to select circularly 6CH output capableof performing cinemasound field andEQ setup 5 1CH input mode Figure 3 2 1 2 Illustration between input circuit 2 Control circuit The latched data and clock signals outputted by MCU N100 pin are sent to pin 39 40 41 of M62446 pin 1 2 3 4 of M62446 output control level to select the input signal and spectrum sampling signal Other functions such as volume and tone adjustment are also controlled by the three control signals The display of display screen is controlled by CPU directly 3 Spectrum sampling circuit The spectrum sampling in AV225T RU is sentfrom pin 13 of N103 to N108B for amplification and then sent to spectrum gating circuit 5 1CH of M62446 selects sampling signal When selecting Cyber Logic 5 1CH control signalis low level now pin 9 11 of N103 is low level and itis known from the truth value table that the output is XO and ZO and this two sampling signals are grounded It is known from Cyber logic principle centre surround and subwoofer channels are
96. ndthen insert flatcable to proper bottom casing andpower amplifier boardheat radiator position 83 9 Install signalboard and use electric screwdriver to fix 10 Use electricscrewdriver to fixscrews A B C Dof signal screw Aof signal board board and theninsert flat cableto proper position EU Le E 11 Install volume boardand use electricscrewdriver to fix 12 Use electricscrewdriver to fixscrews of volume screws A Din the jointplace of rearcover board and theninsert flat cableto proper position 13 Take hold oftuner by lefthand use electric screwdriver 14 Install uppercover useelectric screwdriver to to fix screwsA B take hold ofvideo board byleft hand fix screws ofleft back andright sides poweron and use electric screwdriverto fix screws C D insertflat cable respectively toproper position test and itis ok 84 3 The process of changing LED back lightsource 1 Use nailto enter the gap between LCDscreen and upper 2 Take LCD screen with thumb and forefinger of lefthand edge of LEDback light source and then exertstrength press the whole board by righthand take holdof the to put itup upper edge of LCD screen andexert strength towards arrow direction leftwards 1 i 3 AfterLCD screen fallsoff take hold of forceps by right 4 Use brandiron to weldaway pin of LED back hand to flat cable holder of LCD screen light source
97. nel level to make it in balance with L channel Press the SPEAKERS button on the remote control and R 00 will display Operate as follows Press the button on the remote control to increase the volume of R channel The max level is 60 Press the V button on the remote control to decrease the volume of R channel The min level is 60 4 Surround Left level When sound of center channel is unsuitable you may adjust center level to make it suitable to the sound field Press the SPEAKERS button on the remote control and C 00 will display Operate as follows Press the button on the remote control to increase the volume of C channel The max level is 60 Press the V button on the remote control to decrease the volume of C channel The min level is 60 NOTE The center level cannot be adjusted only when left and right channels have output 5 Surround Right level When sound of surround left is unsuitable you may adjust surround leftlevel to make it suitable to the sound field Press the SPEAKERS button on the remote control and SL 00 will display Operate as follows Press the A button on the remote control to increase the volume of surround left The max level is 60 Press the Y button on the remote control to decrease the volume of surround left The min level is 60 NOTE The surround left level cannot beadjusted only when leftand right channels have output Whe
98. on tube V106 in the circuit has two firstly it is the base electrode bias of upper lower multiple unit tube and its working state decides the static working current of composite power amplifying stage that is we can set the static working point through adjusting the on degree of V106 and the usual method is to change the base electrode resistor of V106 secondly it can automatically adjust the working state of composite power amplifying stage when temperature increases and the adjustment process is as follows 31 Total current of output stage working current leakage current When temperature increases the increase of leakage current leads to the drift of static working point unfavourable at the same time the leakage current of V106 increases Uce decreases to make the bias current of output stage decrease to make working state change and working current of back stage decrease to reach the purpose of temperature compensation Introduce voltage negative feedback to power amplifying circuit of AV225T RU and it is composed of R121 R109 and C105 which can stabilize static working point of difference stage AV225T RU adopts direct output means R111 C116 on power board connected with output end compose Zobel Network to prevent the high frequency self exitation caused by the AC inductive reactance of speaker voice coil 2 Mute circuit When pressing MUTE button on remote controller after the photoelectric conversion performed
99. oubleshooting process for 5 1 has no output is shown the following figure 3 3 2 6 5 1CH has nooutput Change into 2CH andcheck whether it has output Refer to troubleshooting of 2CH hasno output Check power supply of N102 N103 Change N102 N103 Figure 3 3 2 6 Troubleshooting flow chart for 5 1CHhas no output Check power supply circuit 46 7 Troubleshooting process for Left channel has output is shown as the following figure 3 3 2 7 Left channel hasno output whether power amplifier board flat cable XS8 has Check waveform of volume board C122 Check whether signal board X200 is normal whether power amplifier board flat cable XS9 has Check whether power board R113has output Change relay Check power supply circuit power supply ofN106 Check whether C101 has waveform Change N106 Check power circuit Check power supply ofsignal board N100 Change N100 N Check power supply circuit Check whether R121has DC voltage Check R125 R127 power supply check triode ofamplification part of this channel andthen change it Figure 3 3 2 7 Troubleshooting flow chart for Leftchannel has nooutput 47 8 Troubleshooting process for Power not on 15 shown the following figure 3 3 2 8 Power not on Check whether each prot
100. processing is used to generate the delay time it also feature an internal VCO circuit in the system clock thereby making the frequency easily adjustable PT2399 boast of very low distortion THD lt 0 5 and very low noise No lt 90dBV thus producing high quality audio output The pin assignments and application circuit are optimized for easy PCB layout and cost saving advantage 2 FEATURES CMOS Technology Least External component Auto Reset Function Low Noise No lt 90dBV Typical Low Distortion THD lt 0 5 Typical External Adjustable VCO Available in 16 pins DIP or SOP package 3 PIN CONFIGURATION seo VCO Voltage Controlled Oscillator wa 58 wa O Ce O Eme Cn _ Ce _ ow umm osea Ce 3 5 3 function introduction to CD4051 1 DESCRIPTION The CD4051 is a single 8 channel multiplexer with three binary control inputs and inhibit input The three binary control input signals select 1 of 8 channels to be turned on and connect it to the single out The operating voltage is as to 18V and quiescent current is as low as 5 HA max at Vpp 5V 2 PIN CONFIGURATION 9222 40 21 I NN 59 peeso 3 5 4 function introduction to
101. r amplifier assembled in the Multiwatt package specially designed for high quality sound application as Hi Fi music centers and stereo TV sets 2 Features WIDE SUPPLY VOLTAGE RANGE UP TO 25V ABS MAX SPLIT SUPPLY HIGH OUTPUT POWER 25 25W THD 10 RL 8 VS 20V NO POPAT TURN ON OFF MUTE POP FREE STAND BY FEATURE LOW Iq SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION 3 DESCRIPTION 0 o wm 9 o ow Mm w IN1 Inverting Input Pin SL 68 3 5 11 function introduction to M62446 1 DESCRIPTION The M62446FP is 6 channels electric volume controlled 3 wire serial data The IC is suitable for use in home use audio systems and TV sets 2 Features Electric volume Volume level 0dB 79dB dB 1dB step Tone control Bass Treble OdB 10dB 2dB step 4 Output ports Built in microcomputer interface circuit controlled by 16 bit serial data 3 PIN DESCRIPTION T CNN 0 e o 1 _ o x s NN 92 4 ow few Ce or ow em se ow mem o se ow o o peee Ce Co 1 ume 1 me naa 1 1
102. r they are hot to judge the trouble spot You should pay more attention when using this method to check in high voltage parts 1 2 2 Electric resistance method Set the multimeter in resistance position and test whether the numerical value of resistance of each point in the circuit has difference from the normal value to judge the trouble spot But in the circuit the tested numerical value of resistance is not accurate and the tested numerical value of integrated IC s pins can only be used for reference so the elements should be broken down for test 1 2 3 Voltage method Voltage method is relatively convenient quick and accurate Set the multimeter in voltage position and test power supply voltage of the player and voltage of a certain point to judge the trouble spot according to the tested voltage variation 1 2 4 Current method Set the multimeter in current position and test current of the player of a certain point to judge the trouble spot But when testing in current method the multimeter should be series connected in the circuit which makes this method too trivial and troublesome so it is less frequently used in reality 1 2 5 Cutting method Cutting method should be combined with electric resistance method and voltage method to use This method is mainly used in phenomena of short circuit and current leakage of the circuit When cutting the input terminal voltage of a certain level if voltage of the player rises again it means t
103. ree Devices Available 8 lead PDIP 8 lead JEDEC SOIC 8 lead MAP 5 lead SOT23 8 lead TSSOP and 8 ball dBGA2 M Packages 3 PIN DESCRIPTION BERNER 2 o m n 3 5 13 function introduction to 17805 1 Description LM7805 is 5V voltage regulator locates on power board in this player and is used to generate 5V stable voltage 2 Features Suitable for CMOS TTL the other digital IC s power supply Se Internal thermal overload protection Internal short circuit current limiting Output current in excess of 1 A Metal Fin is fully covered with Mold Resin 3 PIN DESCRIPTION Symbol Description 3 5 14 function introduction to 7812 1 Description LM7812 is 12V voltage regulator locates on power board in this player and is used to generate 12 stable voltage Features Suitable for CMOS TTL the other digital IC s power supply Internal thermal overload protection 2 Internal short circuit current limiting Output current in excess of 1 A Metal Fin is fully covered with Mold Resin 3 PIN DESCRIPTION 9mm 00 3 5 15 function introduction to 7912 1 Description LM7812 is 12V voltage regulator locates on power board in this player and is used to generate 12 stable voltage 72 Features Suitable for CMOS TTL the other digital IC s power supply Internal thermal overload protection
104. rol board ee eee 116 Video ____________ 117 ______________________ 117 mee Meet detec 118 61 R molecoberoll fex ee ere 120 120 614 Sofeware 121 121 6 16 Supplement ays 121 Chapter One About Maintenance 1 1 Safety precautions 1 1 1 Power supply When servicing audio power amplifier the servicing personnel pay special attention to the power board with 220V AC or else the improper operation will lead to body damage The alternate current which outputs to power amplifier board through power board is also up to voltage with about 50V when servicing short circuit and joint welding cannot occur or else the elements will be burnt out and trouble range will be enlarged 1 1 2 Precautions for antistatic Movement and friction will both bring static electricity which causes serious damages to integrated IC Though static charge is little when a limited quantity of electric charge is added to large scaleintegrated IC as the capacitance is very small in the meantime now the integrated IC is very much easy to be struck through by static electricity or the performance will decrease Thus static electricity prevention is of extraordinary importance The following are several measures to pre
105. signal through buffer and processing of adder and subtracter after sampling from L R channels In this circuit electronic simulation switch is adopted to fulfil the switch in all kinds of state Signal flow is shown as the following figure 3 2 1 1 Tuner VCD CD4052 DVD Electronic 5 1CH switch OUT N106 gt M62446 N108B DISPLY switch N103 Figure 3 2 1 1 Volume board signalflow chart 20 1 Input selection and sound field processing mode The input selection of AV225T RU is fulfilled through electronic switch CD4052 and CD4053 and the truth value table is shown as follows CD4052 Truth value table CD4053 truth value table 1 5 1CH input state now A B 5 1CH of M62446 are in high level L and R channel signals of 5 1CH input terminal are outputted from pin 3 13 of N101 respectively and then sent to IC N106 for volume and tone adjustment meanwhile C SR SL signals of 5 1CH input terminal are outputted from pin 14 15 40 N102 and then sent to IC N106 for separate volume adjustment in addition SW signal of 5 1CH is outputted through pin 4 of N103 amplified by N107A and then sent to M62446 2 3 kinds of analog input modes AV225T RU has 3 kinds of analog input modes tuning signal VCD and DVD are controlled through signals A B separately Please refer to CD53 truth value table for reference 3 AV225T RU has 3 kinds of sound field modes in all standard Cyber logic and Hi Fi
106. sis and troubleshooting after power on VCD channel inputs sine wave signal check power amplifier board Vc Vc Vs and Vs power supply is normal test volume board capacitor C133 C134 there is signal test pin 4 and 5 of volume board flat cable holder XS20 there is signal so itis sure that volume board working is normal test pin2 and 3 of signal board socket XS9 there is no signal trouble lies in signal board by primary judgment test power supply voltage 12V and 12V of pin 4 and 8 of N100 normal left channel output is normal after changing N100 right channel output is normal after changing N101 centre has no output when adjusting to Cyber logic state test pin 3 of volume board flat cable holder XS20 there is signal test pin 4 of signal board socket XS9 there is no signal test N102 power supply is normal change N102 and outputis normal so trouble is removed Note because of unstable voltage 4558 of some part will be burnt down 12V 12V is pulled down then whole system working is abnormal so several 4558 are required to change sometimes 39 Instance 61 Symptom no OSD onscreen display Description after power on relay attracting output signal is normal LCD has no display background light of display screen is lighted when pressing buttons Analysis and troubleshooting because background light is bright it is confirmed that 5V voltage of control panel is normal When using remote controller remote control f
107. ssing mode scheme With its hardware features and powerful instruction set it s straight forward to make it a versatile and cost effective controller for those applications which demand up to 32 I O pins for PDIP package or up to 36 pins for PLCC QFP package or applications which need up to 64K byte flash memory for program data To program the on chip flash memory a commercial writer is available to do it in parallel programming method 62 Features 2 4V 3 0V For V Version Working voltage 3 0V 3 6V For L Version 4 5V 5 5V For C Version General 8052 family compatible 12 clocks per machine cycle 64K byte on chip program flash 4096 byte on chip data RAM Three 16 bit Timers Counters One Watch Dog Timer Four 8 bit I O ports for PDIP package Four 8 bit I O ports one 4 bit I O ports for PLCC or QFP package Full duplex serial channel Bit operation instruction 2 Industrial Level 8 bit Unsigned Division 8 bit Unsigned Multiply BCD arithmetic Direct Addressing Indirect Addressing Nested Interrupt Two priority level interrupt A serial I O port Power save modes Idle mode and Power down mode Code protection function Low EMI inhibit ALE Bank mapping direct addressing mode for access on chip RAM 8 channel PWM function with P1 0 P1 7 3 PIN CONFIGURATION P1 0 T2 o P RST Liquid
108. t stand for each frequency point signal range shown as in the following figure 3 2 3 2 V Note the voltage range in the figureis uncertain D ee 1KHZ 10KHZ 100HZ A 35HZ 3KHZ 352 i l Time intervalof swich Frequency point circulargating cycle Figure 3 2 3 2 Frequency point signalrange voltage value 4 A D conversion display output circuit two cases divided 1 When there 15 no signal input MCU sends a P CHARGE high level signal to B electrode of V104 the positive direction end of comparator N102B is low voltage for the reverse end of N102B gets the partial pressure of R169 R172 thus it will make N102B output voltage with 12V about to make triode V105 cutoff C electrode of V105 will give a high level P ADINTO to pin 12 of MCU to inform MCU of not performing A D conversion Pin 9 10 of N108 has action and keep in high level 2 When machine detects signal MCU sends CHARGE low level signal to B electrode of V104 5V voltage charges C137 through V103 when the voltage value of reverse end is reached comparator turns over pin 7 of N102B outputs 12V voltage to make V105 on C electrode is low level after MCU 28 Receives low level signal 35Hz level gating is immediately finished and then switches to next frequency Point 100Hz During the course of conversion P CHARGE outputs an instant high level to make V104 on releases the volta
109. tomatically tune upwards downwards until your needed radio station programs When programs are searched it will stop searching automatically Front panel TUNING A 3 4 TUNING Y Remote control Q f the tuning searching stops in imperfect radio station or radio waveinterferes please continue operating f the tuning searching stops in imperfect radio station because of weak radio station signals please change into manual tuning method 4 The following save and call operations are the same with manual tuning operations Auto Tuning Two 1 Firstly select TUNER asthe current input sound source according tothe operations oF Manual Tuning and then select the wave band to be received 2 Press MEMORY button on the front panel remote control and then press TUNINGA V button for above 0 5 seconds during the course of displaying MEMORY to enter the radio station auto searching status Remote control 14 NOTE 1 This operation will search and save automatically so the user preset programs will be covered 2 Pressing TUNINGA Y button may stop the function the course of this operation f the tuning searching stops in imperfect radio station because of weak radio station signals or radio wave interferes please change into manual tuning method Clear Radio Station If you do notneed the preset radio station you may clear
110. trum sampling sent to thenegative direction and amplifying circuitN103 N108B terminal of N103Aof f volum r CPU board of volume board Whether the in phase terminal of N103Bis low level Check N103Aamplifying and power supply circuit Whether the in phase terminal of N103Bis low level Check V102 andperipheral circuit Whether VD103 is normal Change VD103 Check VD101 CPU V101 and peripheral circuit Figure 3 3 2 4 Troubleshooting flowchart for Cannotsearch automatically 5 Troubleshooting process for No output 2 channel is shown as the following figure 3 3 2 5 No output 2 channel Check whether power supply of eachchannel is normal Check whether mute circuit signal is normal Check whether power amplifier board XS8 has output Check whether voltage of power board R100 is normal Y Change relay Refer to troubleshooting of Power noton Check whether MIC holder is normal andthen check mute circuit Check whether signal of X20 is normal Change VD113 Check of signal board is normal Y Change signal board N100 N101 N102 Figure 3 3 2 5 Troubleshooting flow chart for Nooutput 2 channel whether 12V voltage N 45 Check power supply ofsignal board N106 Change N106 Y Check power supply circuit N Check power supply and change N106 6 Tr
111. unction is normal which means that control panel 3 3V is normal change LCD screen display is normal and trouble is removed Note when no OSD appears firstly make sure whether display screen voltage is normal whether data buffer output is normal because display screen is easy to damage in most conditions it is display screen that is damaged Instance 7 Symptom power not on Description not any reaction after power on relay not attracting no OSD Analysis and troubleshooting power on and observe that each fuse is normal secondary stage voltage of transformer is tested 0 primary stage voltage of transformer is tested normal primary stage resistance is tested infinite so it is judged that transformer has been burnt down change transformer and trouble is removed Note when power not on firstly confirm that whether it is power not on or no OSD whether part of voltage or all voltage is abnormal if itis that power noton test step by step from power socket until the trouble is found Instance 8 Symptom remote controller has no function Description after power on panel buttons have nofunction remote controller has no function Analysis and troubleshooting after power on remote controller has no function change its battery and it also has no function test pin 3 P REM signal of CPU board socket XP100 when remote controlling this signal has no pulse waveform test voltage of control panel resistor R102 it is when che
112. vent static electricity 1 Use a piece of electric conduction metal with the length of about 2 metres to insert into the earth and Fetch the lead wire from the top of the surplus metal and connect to the required static electricity device The length and depth of the metal embedded under the earth should be determined according to the wettability of the local soil For humid places it may be shorter and longer and deeper for dry places If possible it can be distributed and layed in terms of shape 2 On operating table board the antistatic table cushion should be covered and grounded 3 All devices and equipments should be placed on the antistatic table cushion and grounded 4 Maintenance personnel should wear antistatic wrist ring which should be grounded 5 Places around the operating position should also be covered with electric conduction cushion or Painted with antistatic paint 1 1 3 About placement position 1 Audio power amplifier cannot be installed in places with high temperature and humidity 2 Positions for placement should be stable and secure 1 2 Maintenance method 1 2 1 Visualized method Directly view whether abnormalities of collision lack of element joint welding shedding welding rosin joint copper foil turning up lead wire disconnection and elements burning up among pins of elements appear Check power supply of the machine and then use hands to touch the casing of part of elements and check whethe
113. wer amplifier offering very low distortion and high quality performance for consumer audio applications The LM1875 delivers 20 watts into a 4 8r 8 bad on 25V supplies Using an 8 bad and 30V supplies over 30 watts of power may be delivered The amplifier is designed to operate with a minimum of external components Device overload protection consists of both internal current limit and thermal shutdown The LM1875 design takes advantage of advanced circuit techniques and processing to achieve extremely low distortion levels even at high output power levels Other outstanding features include high gain fast slew rate and a wide power bandwidth large output voltage swing high current capability and a very wide supply range The amplifier is internally compensated and stable for gains of 10 or greater Features Up to 30 watts output power AVO typically 90 dB Low distortion 0 015 1 kHz 20 W Wide power bandwidth 70 kHz Protection for AC and DC short circuits to ground 2 Thermal protection with parole circuit High current capability 4A Wide supply range 16V 60V Internal output protection diodes 94 dB ripple rejection Plastic power package 220 3 PIN DESCRIPTION IN Non Inverting Input Pin C 67 o Signal out C VCC Positive Power Supply w 3 5 10 function introduction to TDA7265 1 DESCRIPTION The TDA7265 is class AB dual Audio powe

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