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Akai A-5181, Руководство по обслуживанию, Страница: 44 / 50

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Akai A-5181 Скачать руководство пользователя страница 44

                                                                                                                                               

 

 

 

MTK DECODER 

 

8. 

PIN103(TRCLOSE) 

Check MT1389D 

PIN39(TROPEN), 

Check “TROPEN”, “TRCLOSE” signal level 

normal (When open tray, “TROPEN” should be 

high level, “TRCLOSE” should be low level 

Eject tray abnormal  

(CVBS normal) 

 

 

 

 

yes 

 

yes

no 

Check IC U3 

Check “LOAD+”, “LOAD-“ voltage 

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 (When open tray, “TROPEN” should be 

low level, “TRCLOSE” should be high level 

Close tray abnormal (CVBS normal) 

 

 

 

 

Check “LOAD+”, “LOAD-“voltage larger 

than3.0V (connect multimeter red pen to 

“LOAD-”, black pen to “LOAD+” 

no 

Check IC U3 

 

 

 

Check “P4” or “P5” connection 

 

8-24 

Содержание A-5181

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 33: ...8 8 13...

Страница 34: ...8 14...

Страница 35: ...8 15...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

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

Страница 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...

Страница 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...

Страница 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...

Страница 50: ...9 1...

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