Akai-A-5181-Service-Manual(1) 电路图 维修手册.pdf

《Akai-A-5181-Service-Manual(1) 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Akai-A-5181-Service-Manual(1) 电路图 维修手册.pdf（50页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUAL Model: A5181 DVD PLAYER www.akai.ru RadioFans.CN 收音机爱 好者资料库 Terminology do not let electricity cut off. Otherwise the player will halt and never be operate again. If the DVD player cannot read the disc, please record some data file (trash files that the player cannot support) before r

2、ecording upgrading software. 3-1 No. Test item Requirement 1 Analog output level(V) (Virtual value) 1.02.0v 20Hz 1 125Hz 1 1KHz 1 10KHz 1 18KHz 1 2 Audio amplitude/frequency response (dB) 20KHz 1 3 Audio SNR (dB) (A) 90 4 Audio distortion and noise (dB) (1KHz) -65 5 Dynamic Range (dB) (1KHz) 80 6 Cr

3、oss-Sound base wave (dB) 80 1 7 1KHz Channel Balance (dB) -50 8 Intermodulation Distortion (dB) 9 Frequency error (dB) 0.02 0 -10 -20 -40 10 Level non-linear (dB) -60 4-1 1 11 Digital out level (V) (Vp-p)? 0.50.05 ? 12 ? ? 12 ? -4.531 12 De-bass function (dB) ?disc 784? ? 13 ? ? 13 ? -9.041 DTS 0dB

4、1KHz output Level Amplitude Response under 0dB output level (dB) (20Hz-20KHz) DOLBY Reference Level Reference Level Amplitude Response +0.5/-1.0(dB) (20Hz-20KHz) FL FR C SL SR 13 AUDIO FEATURE DTS Test DOLBY Test SW 14 Output Intensity (iput 1KHz 20mVp-p) 2.50.5?V? 0.5 15 Distortion and Noise (%) 12

5、0Hz 3 16 Frequency Response (dB) 5KHz 3 17 MIC Frequency error (dB) 45 18 Short Read Time (Sec) 5 10 19 Long Read Time (Sec) 20 other Max Power Consumption (W) 15 Electrical Performance Standards No. Test item Requirement CVBS output 1.00.2 21 Video Output Level Vp-p(V) Line Sync amplitude 0.30.05 2

6、50 VCD 4-2 SVCD 350 AV output DVD 450 VCD 250 SVCD 350 22 Horizontal Definition (TV) S video output DVD 500 3.5?-20dB? VCD SVCD 3.5?-20dB? 23 Luminance channel bandwidth and Amplitude Response (MHz) DVD 5.5?-6dB? 3.5?-23dB? VCD SVCD 3.5?-24dB? 24 Chroma channel bandwidth and amplitude response (MHz)

7、 DVD 1.5?-6dB? 25 Luminance non-linear distortion (%) 5 26 Luminance Wave distortion (%) 10 27 Luminance SNR (dB) 50? 28 Chroma SNR (dB) AM?60 PM?50 29 Luminance/Chroma signal delay (ns) 100 30 Differential plus DG (%) 5 31 CVBS FEAT URE Differential Phase DP () 5 Y channel 700140 Chorma 880176 32 S

8、-video signal amplitude Vp-p load (mV) C channel Chroma Sync 30060 Y channel 5.5?-6dB? 33 S-video signal bandwidth and amplitude response (MHz) C channel 1.5?-6dB? Y channel 50? 34 S-video signal SNR (Db) C channel 50 Y channel 700140 U channel 700140 35 YUV output signal amplitude Vp-p load(mV) V c

9、hannel 700140 Y channel 5.5?-6dB? U channel 2?-6dB? 36 YUV output signal bandwidth and amplitude response (MHz) V channel 2?-6dB? Y channel 50? U channel 50 37 YUV output signal SNR (Db) V channel 50 R channel 700140 G channel 700140 38 RGB output signal amplitude Vp-p load(mV) B channel 700140 R ch

10、annel 5.5?-6dB? G channel 5.5?-6dB? 39 RGB output signal bandwidth and amplitude response (MHz) B channel 5.5?-6dB? R channel 50 G channel B channel 50 40 VIDEO FEATURE Y,U,V FEAT URE RGBoutput signal SNR (Db) Y channel 50 Electrical Performance Standards Package (Inbox)and Block Diagrams 6 7 1 2 3

11、8 9 4 10 5 1. AV Cable 6. Owners Manual bag 2. Batteries 7. Owners Manual 3. Remote control 8. EPS 4. scart Cable 9. Power cord 5. Scart cable box 10. Color box 5-1 DVD Box Block Diagram 6-1 General Classification of Symptoms Common phenomenon classification 1. VFD no display 2. Check Power line con

12、nect to POWER?Check switch ? Connect again. Normal? N Check signal wire connect to decoder board correct? Connect again, Normal? Y N Y KB board OK? Y To decoder board service D1 N To KB board service K1 TV no voice Check audio wire between DVD player and TV N Connect DVD left/right channel to TV cor

13、rectly Y Check Scart wire connection to TV N Connect again Y N Setup audio by referring to manual DVD audio setup correct? Y To decoder board service D2D3-1D3-3 7-1 General Classification of Symptoms 3. TV no display N Video wire connection correct? Connect to TV correctly Y N Connect again, TV disp

14、lay normal? SCART wire connection correct? N 4. Y N Press “v.mode” key of the REMOTE. Press times, normal? N Y To decoder board service D3D3-2D3-3 Cannot open tray Loader too low/high? Adjust loader Check Loader signal wire connects to board correct? Connect again, normal? Check flat ribbon connect

15、to decoder/servo board Connect again, normal? ? Y N N Y N N Y 7-2 General Classification of Symptoms 5. Do not read disc ? Press “Open/Close” on front panel, the data line of KB board has wave out? To KB board service K3 Press “Open/Close” on remote control, the IR line of KB board has wave out? To

16、KB board service K2 To board service N N Y Y Disc scratched/dirty? Replace disc Check Loader wire connect to decoder board correct Connect again, normal? Check flat ribbon connect to decoder board correct Connect again, normal? Y N N To decoder board service Y N N N Y 7-3 General Classification of S

17、ymptoms 6. Image/voice distortion Disc scratched/dirty? Replace To decoder board service D4, D5 N Y 7. Optical/Coaxial output abnormal Audio setup correct? Adjust according to manual instruction Check optical/coaxial connection to decoder device OK? Adjust according to manual instruction To decoder

18、board service D6 N N Y Y 8. Read disc and halt Disc scratched/dirty? Replace/clean disc To servo board service Y N 7-4 General Classification of Symptoms Reading drag To servo board service 9. To KB board service K3 Cannot operate by remote control 10. 11. MIC no voice To MIC service M1 To MIC servi

19、ce M2 MIC self activated 12. Judgment standard for loader damage When below phenomenon exist, the loader may be damaged. 1. no spin 2. no laser 3. cannot open/close tray normally 4. main axis turning, but no pickup focus or gliding 5. cannot read discs When above phenomenon exists, please try replac

20、ing loader to solve the problem. 7-5 8-1 8-1 Power Board Block Diagram 8-1 Power Board Block Diagram 8-2 2 1 8MM -2P 1 2 3 4 7 65 8 IC101 DH321 DIP 2 1 3 4 IC102 PC817 R101 56K/2W C103 104/50V C202 104/50V C101 103/1KV E102 47UF/50V F101 T1AL 250V E101 22U/400V D105 FR107 D106FR104 0.1uF-275V 12mH 2

21、 1 8MM-2P 470/1/4W FR154 100UF/25V 100UF/25V IN5822 1000UF/10V 10UH 10UH/2A 23 1 TL431 2200pF-250V R203 CY103 E201 E202 D204 D201 L201 L202 L203 E205 CX101 L101 CN101 CN102 NF1 R202 4.7K/1/4w D103 1N4007 D101 1N4007 D102 1N4007 D104 1N4007 E206 1000UF/10V R201 4.7K/1/4W -12V +12V 5V FR154 D202 E203

22、220UF/16V E204 220UF/16V IC201 10UH T101 AKAI A-5181 Title:REV: DATE: Viper22+EE25 2005/09/06 A R103 2.2K/1/4W R102 10R/1/4W 1K/1/4W R203 L102 磁珠 ZD1 4.3V 8 Main point waveforms and schematic diagrams of electronic components 8-1 Reference waveform of key test point of power board TP1+12V (no disc)

23、3-mVpp TP1 (reading disc) 250mVpp TP2+5V (no disc) 3-mVpp TP2+5V (reading disc) 40mVpp TP3 (idle) 20Vpp TP3 (no disc)20Vpp TP3 (reading disc)20Vpp 8-3 8 Repair of Power Board I. Power switch working principles TinySwitch-II(TNY267) maintains the simplicity of the TinySwitchtopology, while providing

24、a number of new enhancements tofurther reduce system cost and component count, and topractically eliminate audible noise. Like TinySwitch, a 700 Vpower MOSFET, oscillator, high voltage switched current source,current limit and thermal shutdown circuitry are integrated onto amonolithic device. The st

25、art-up and operating power are derived directly from the voltage on the DRAIN pin, eliminating the need for a bias winding and associated circuitry. In addition, the TinySwitch-II devices incorporate auto-restart, line undervoltage sense, and frequency jittering. An innovative design minimizes audio

26、 frequency components in the simple ON/OFF control scheme to practically eliminate audible noise with standard taped/varnished transformer construction. The fully integrated auto-restart circuit safely limits output power during fault conditions such as output short circuit or open loop, reducing co

27、mponent count and secondary feedback circuitry cost. An optional line sense resistor externally programs a line under-voltage threshold, which eliminates power down glitches caused by the slow discharge of input storage capacitors present in applications such as standby supplies. The operating frequ

28、ency of 132 kHz is jittered to significantly reduce both the quasi-peak and average EMI, minimizing filtering cost. 1. Conversion from a.c. to d.c. circuit 220V a.c. current flows restrictively through F1 fuse, and through D301D304 to combine as bridge rectification. After C1?L2?C2 undergoes electro

29、lytic filter, we can obtain a 320V d.c. voltage (Uhv). 2. Process to start up the software The TinySwitch-II does not require a bias winding to providepower to the chip, because it draws the power directly from the DRAIN pin (see Functional Description above). This has twomain benefits. First, for a

30、 nominal application, this eliminatesthe cost of a bias winding and associated components.Secondly, for battery charger applications, the current-voltage characteristic often allows the output voltage to fall close tozero volts while still delivering power. This type of application normally requires

31、 a forward-bias winding which has many more associated components. With TinySwitch-II, neither are necessary. For applications that require a very low no-load power consumption (50 mW), a resistor from a bias winding to the BYPASS pin can provide the power to the chip. The minimum recommended curren

32、t supplied is 750 A. The BYPASS pin in this case will be clamped at 6.3 V. This method will eliminate the power draw from the DRAIN pin, thereby reducing the no-load power consumption and improving fullload efficiency. And check c5,it is very importance of starp up. 3. Bias winding After starting th

33、e power, T P1P2 bias winding supplies bias current and error current to the internal of IC2 , through D7 and C4 rectifier filter and through R2 light-electric coupler.Check IC2 BP pin (IC2 PIN1),its voltage is 6.3v. 8 8-4 4. Regulation process of output voltage When the input current of control pin

34、(5) IC2 decreases (or increases), oscillation waveform will be regulated automatically so that T ratio will increase (or decrease) and the output voltage will increase (or decrease). Output voltage feedback circuit is completed by Z1?R8?D13? 5?IC2 TNY267 introduction 8 8-5 1?No voltage output Measur

35、e the voltage ofC1?L2?C2 YES Eliminate short-circuit point Far less than 320V Check a.c. and d.c. conversion elements such as FUSE, power switch, D1?D2?D3?D4 etc. Open circuit of 13 pins of T Measure whether the voltage of 1 pin IC (VFF) is equal to 2.8V Measure whether the voltage of 5 pin IC2 (5)

36、is equal to 6.3V Check whether C5?R2?D7?C4?R4? C6 are damaged Test whether the windings of T are short circuit, open circuit YES NO YES Replace T PIC 817?Z1 are damaged Measure the voltage of 5pin (VCC) of IC2 Measure each output terminal to see whether it is short circuit NO About 320V 0V About 320

37、V YES NO NO Measure other elements 8 8-6 1. 2?Unstable voltage output, decrease of carrier capability Take out the output cord, connect false loading Measure the working temperature of elements by infrared thermometer Replace optical coupling Is the reference voltage of R8 at 2.5V? No Is the voltage

38、 of IC2 control pin normal? There is damage in D1?D2?D3?D4, forming half-wave rectification Is the voltage of C2at 320V? Check D7?R2 Is it normal after replacing Z1? Abnormal Analyse heating elements Is the voltage of light-emitting tubes in optical coupling at about 1V? Other power boards overloade

39、d Normal output voltage Abnormal Normal No Yes Yes No No Yes No Yes Check D13?R8?Z1?D12 +5V?+12V?-12V?-24V is lower Yes No Check other compents 8-7 5 5 4 4 3 3 2 2 1 1 DD CC BB AA URST# URST# LDO_AV33 RFV33 DV33 VCC V18 V33 V18 DV33 VCC -12V +12V AVCC GND VCCV33 VCC_AUDIO A_MUTE +P5V A_MUTE DV33 RFV

40、33 LDO_AV33 DV33 +12V-12V V18 AVCC V33 V33 V33 +P12V-P12V VCC +P5V VCC VCC_AUDIO +P5V +P12V +P5V -P12V VCC +P5V URST# 2 V18 2 DV33 2,3,4,5 VCC 2,3,4,5 +12V 4,5 -12V 4,5 AVCC 2 GND 2,3,4,5 VCC_AUDIO 5 A_MUTE 5 Title SizeDocument NumberRev Date:Sheetof MediaTek Incorporation INDEX 4 COMMON89D_KHM310_V

41、5 C 15Thursday, June 24, 2004 COMMON89D_KHM310_V5 Audio DAC MT1389E DEVICE MT1389D (LQFP216) DVD Demo Board for KHM310 DVDD TYPE Digital 1.8V Digital 3.3V 2 RF, SERVO C57C56&C58=100PF R101 When use internal Adac must change follow value R114 Notice C56 2200PF C57 220PF C58 2200PF C59 31K31K100PF 100

42、0PF 100PF Internal DAC1000PF 20K R166 560 + CE32 10uF/16V + CE42 10uF/16V C64220pF R123 180k + CE35 10uF/16V + CE28 10uF/16V J10 6PIN 2.0 1 2 3 4 5 6 Q19 8550 1 23 C60220pF + CE20 10uF/16V R156 75 R142R CB67 0.1uF J8 9PIN 2.0 1 2 3 4 5 6 7 8 9 R136 5.1k R144 5.1k R162 100 P3 SPDIF 1 2 3 + - U16A NJM

43、4558 OPA 3 2 1 84 R134 10,0805 R158 110 D151N4148 12 CB69 0.1uF U15 WMA8766 MODE 1 MCLK 2 BCLK 3 LRC 4 DVDD 5 DGND 6 DIN1 7 DIN2 8 DIN3 9 DNC 10 ML/I2S 11 MC/IWL 12 MD/DM 13 MUTE 14 TESTREF1 15 VREFN 16 VFEFP 17 VMID 18 NC 19 NC 20 VOUT1L 21 VOUT1R 22 VOUT2L 23 VOUT2R 24 VOUT3L 25 VOUT3R 26 AGND 27

44、AVDD 28 + CE43 10uF/16V + - U13B NJM4558 OPA 5 6 7 84 + CE45 10uF/16V + - U14A NJM4558 OPA 3 2 1 84 R116 100k C58220pF R120 5.1k R154 100k CB66 0.1uF C67 100pF R157 20k R115 4.7k C56220pF R152 100 R13233 D17 1N4148 12 R137 100 P4 RCA 1 2 3 CB59 0.1uF C66 100pF C68220pF + CE44 10uF/16V R12533 J6 6PIN 2.0 1 2 3 4 5 6 Q22 2N3904 1 23 + CE36 10uF/16V C70 27pF CB58 0.1uF R102 R C65 2200pF Q24 2N3904 1 23 C71 0.1uF R114 20k R13133 R58 10 0805 Q23 2N3904 1 23 R150 10k +CE40 10uF/16V R13333 CB62 0.1uF R60 10 08