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Akai A-5181, Service Manual

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SERVICE MANUAL

Model:

                     A5181

DVD PLAYER

www.akai.ru

Summary of Contents for A-5181

Page 1: ...SERVICE MANUAL Model A 5181 DVD PLAYER www akai ru...

Page 2: ...Caption Text captions for video which are not normally visible as opposed to open captions which are a permanent part of the picture In the United States the official NTSC Closed Caption standard req...

Page 3: ...em based on 12 and 8 cm optical discs 1 1 DVD R DVD Recordable defines a standard for recordable DVD drives and media defined by the DVDRW Alliance Often called plus R the format is write once compare...

Page 4: ...SACD can also be backward compatible using so called hybrid discs with an extra layer that allows them to be played on conventional CD players but then only with ordinary CD quality SACD can be played...

Page 5: ...audio unlike 1 2 D1 DVD that is the same resolution at 48khz audio Not all players will play CVD compatible players CVD Guide DivX DivX is a new format for digital video much like MP3 is a format for...

Page 6: ...ginal microphone feed on Compact Discs and DVD Audio HDCD has been used in the recording of more than 5 000 CD titles which include more than 250 Billboard Top 200 recordings and more than 175 GRAMMY...

Page 7: ...g in the operation and service manuals 2 Parts identified by the symbol in schematic diagram parts are critical for safety Replace only with specified part numbers Note Parts in this category also inc...

Page 8: ...parts and high voltage parts by its shape So these wires must be restored to its former state 10 After updated the hazardous live part or accessible part if the clearance or creepage distance cann t...

Page 9: ...en replacing primary circuit components confirm specified clearance distance d between soldered terminals and between terminals and surrounding metallic parts See table below Table 1 Ratings for selec...

Page 10: ...igure and following table Table 2 Leakage current ratings for selected areas AC Line Voltage Region Load Z Leakage Current i Earth Ground B to or 0 7mA peak or 2mA DC Antenna earth Terminals 100 to 13...

Page 11: ...rding c The upgrading software MTK BIN must be in root directory Recording mode must be ISO9660 MODE1 LEVEL1 DO NOT SELECT JOLIET LOOSEN ISOSTRICT 2 Load the disc 3 DVD will read disc and prompt upgra...

Page 12: ...near dB 60 4 1 1 11 Digital out level V Vp p 0 5 0 05 12 12 4 53 1 12 De bass function dB disc 784 13 13 9 04 1 DTS 0dB 1KHz output Level Amplitude Response under 0dB output level dB 20Hz 20KHz DOLBY...

Page 13: ...Chorma 880 176 32 S video signal amplitude Vp p load mV C channel Chroma Sync 300 60 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...

Page 14: ...Package Inbox and Block Diagrams 6 7 1 2 3 8 9 4 10 5 1 AV Cable 6 Owner s Manual bag 2 Batteries 7 Owner s Manual 3 Remote control 8 EPS 4 scart Cable 9 Power cord 5 Scart cable box 10 Color box 5 1...

Page 15: ...DVD Box Block Diagram 6 1...

Page 16: ...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...

Page 17: ...SCART wire connection correct N 4 Y N Press v mode key of the REMOTE Press times normal N Y To decoder board service D3 D3 2 D3 3 Cannot open tray Loader too low high Adjust loader Check Loader signa...

Page 18: ...K3 Press Open Close on remote control the IR line of KB board has wave out To KB board service K2 To board service N N Y Y Disc scratched dirty Replace disc Check Loader wire connect to decoder board...

Page 19: ...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 decode...

Page 20: ...IC service M1 To MIC service 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...

Page 21: ...8 1 8 1 Power Board Block Diagram...

Page 22: ...470 1 4W FR154 100UF 25V 100UF 25V IN5822 1000UF 10V 10UH 10UH 2A 2 3 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...

Page 23: ...ams of electronic components 8 1 Reference waveform of key test point of power board TP1 12V no disc 3 mVpp TP1 reading disc 250mVpp TP2 5V no disc 3 mVpp TP2 5V reading disc 40mVpp TP3 idle 20Vpp TP3...

Page 24: ...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 D301 D304 to combine as bridge rectification After C1 L2 C2...

Page 25: ...ol pin 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 feedb...

Page 26: ...er the voltage of 1 pin IC VFF is equal to 2 8V Measure whether the voltage of 5 pin IC2 5 is equal to 6 3V Check whether C5 R2 D7 C4 R4 C6 are damaged Test whether the windings of T are short circuit...

Page 27: ...voltage 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 eleme...

Page 28: ...udio 12V Digital 5V Audio DAC Servo 3 3V Audio 5V MT1389E VCC Digital 3 3V SDRAM RFV33 SD33 AVDD 1 INDEX POWER RESET MT1389E 4 VIDEO OUT SUPPLY 3 MEMORY SDRAM FLASH EEPROM V18 12V 12V Audio 12V OP AMP...

Page 29: ...5 10k R48 18k R44 1 C2 390pF R37 R CE15 47uF 16v TP48 Q1 1 2 3 TP41 CB25 0 1uF R38 R U5 AM5668 VINFC 1 PVCC1 9 PGND 10 VOSL 12 CF2 3 CF1 2 VOTK 15 VNFFC 7 VOFC 14 VOFC 13 PVCC2 21 PGND 19 VNFTK 20 CTK...

Page 30: ...LK 35 DQMH 36 NC 37 VCCQ 38 DQ8 39 DQ9 40 VSSQ 41 DQ10 42 DQ11 43 VCCQ 44 DQ12 45 DQ13 46 VSSQ 47 DQ14 48 DQ15 49 VSS 50 CB54 0 1uF C0603 CB37 0 1uF C0603 CB41 0 1uF C0603 U9 ESMT M12L64164A N C TSOP5...

Page 31: ...8 3906 R100 150 1 Q12 2N3904 1 2 3 R91 150 1 R79 75 1 R90 2 2k D19 1N4148 1 2 G G C Y P1 S VIDEO RCA 1 2 3 4 5 R73 39 1 R76 75 1 C50 47P R87 NC R96 75 1 D8 1N4148 1 2 R72 NC D5 1N4148 1 2 D2 1N4148 1...

Page 32: ...58 OPA 3 2 1 8 4 R134 10 0805 R158 110 D15 1N4148 1 2 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...

Page 33: ...8 8 13...

Page 34: ...8 14...

Page 35: ...8 15...

Page 36: ...l wave 5V 12V 12V 3 3V U2 1 8V U1 Check reset circuit reset at high electrical level Check crystal circuit 27MHz and SDRAM frequency 108MHz Decoder board repair flow chart Diagram not included 1 VFD n...

Page 37: ...setup software menu bad Set to CVBS yes good Check Q7 emitter voltage between 1 0 0 2VPP use standard color band signal disc to test yes no Check Q7 basal pole between 0 4 0 2VPP no remove Q7 check P...

Page 38: ...o setup to YUV no set to YUV ReplaceQ8 Q10 Q15 Check MT1389D PIN179 181 182short circuit Replace MT1389D IC yes yes Check Q8 Q10 Q15 emitter voltage between 0 7 0 14VPP no yes Check Q8 Q10 Q15 base po...

Page 39: ...VGA connect bad Connect correct Good Check DVD system PAL NTSC is the same as TV setting In VGA PAL line sync frequency is 31250Hz field sync frequency is 50Hz In VGA NTSC line sync frequency is 31500...

Page 40: ...art CVBS PIN167 voltage should be 0 0 4V in Scart RGB it should be 1 3V Check PIN167 voltage bad In Scart CVBS RGB SWITCH is 3 3V high in RGB it is 0V Check MT1389D PIN169 good Check RGB signal SCART...

Page 41: ...heck L39 surround left L40 surround right with sin wave 5 6V VPP load 1K signal disc check L41 center L42 subwoofer with sin wave 5 6V VPP A B C no yes Check DAC ML DAC MR with sin wave signal yes Rep...

Page 42: ...disc With disc Auto adjust Wait for order Servo initial work process Power On System initiated MT1389D reset and initiated wait for task Tray door close Close tray door no yes Pickup in inner circle...

Page 43: ...MTK DECODER Check disc Activate pickup Focus loop move up Focus loop move down Disc check error yes no Focus loop move up Focus loop move down Pickup LD off Initiate auto adjust Action repeat 8 23...

Page 44: ...age larger than3 0V connect multimeter black pen to LOAD red pen to LOAD Check P4 or P5 connection with loader yes no PIN103 TRCLOSE Check MT1389D PIN39 TROPEN Check TROPEN TRCLOSE signal level normal...

Page 45: ...8 Repair of key board 8 25...

Page 46: ...8 Repair of key board 8 26...

Page 47: ...ED HAS DISPLAY OK Check Power board and KB board connection Connect correctly Check KB board input power normal Make Power board under normal supply Check IC SM1694 LED work properly Check other compo...

Page 48: ...12V PHO401 E403 100uF 16V 1 2 MIC2 E401 10uF 16V 1 2 R403 22k C404 680pF L401 3 3uH C405 100pF R410 10k vr401 R VAR1 1 2 3 4 5 6 1 2 3 4 5 6 E404 10uF 16V 1 2 MIC1 12V 12V R417 10 E402 100uF 16V 1 2...

Page 49: ...n normal NO NO MIC board power supply normal When MIC has input IC 4558 Pin 1 to 7 has output Check Power board and Mic board connecting wires Replace IC4558 return normal Check decoder board NO NO NO...

Page 50: ...9 1...

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