Akai-DVP-4799-KDMC-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL Model: DVP4799KDMC DVD PLAYER www.akai.ru RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 1. General Section 1.1 Cautions/Warnings 1.1.1 Product Safety Notice Parts marked with the symbol in the schematic diagram have critical char- acteristics. Use ONLY replacement pares recommended

2、by the manufacturer. It is recommended that the unit be operated from a suitable DC supply or batter- ies during initial check out procedures. 1.1.2 Leakage Current Check/Resistance Check Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line t

3、o insulated resistance check. If the leakage current exceeds 0.5 milliamps , or if the resistance from chas- sis to either side of the power cord is less than 240 K ohms, the unit is defec- tive. WARNING: DO NOT return the unit to the customer until the problem or loca- ted and corrected. 1.2. Safe

4、Warnings 1.2.1. Protection of Eyes from Laser Beam To protect eyes from invisible laser beam during servicing DO NOT LOOK AT THE LASER BEAM WARNING HIGH VOLTAGE INSIDE TO PREVENT ELECTRICAL SHOCK DO NOT REMOVE ANY CO- VER OR SCREW. REFER ALL SERVICING TO QU- ALIFIED SERVICE PERSONNEL. DO NOT ALLOW T

5、HIS PRODUCTION BE EXPOSED TO RAIN OR MOISTURE. DISCONNECT THIS MAINS PLUG FROM THE SUPPLY SOCKET WHEN NOT IN USE. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN Page 2 RadioFans.CN 收音机爱 好者资料库 1.2.2 Laser Caution CAUTION Adjusting the knobs, switches, and controls , ect. Or taking actions not specified h

6、erein may result in a harmful emission of laser beams. This CD Changer must be adjusted and repaired only by qualified serv ice personnel. THIS IS COMPACT DISC PLAYER IS CLASSIFIED AS A CLASS LASER PRODUCT. THE LASS 1 LASER PRODUCT LABEL IS LOCATED ON THE REAR EX- TERIOR. 1.3. Precautions 1.3.1. ESD

7、 Precautions in Repairing 1.3.1.1 Do not apply excessive pressure on the mechanical parts (movi- ng pares), including the Pickup Block, as extremely high mechanical pre- cision or required in these parts. 1.3.1.2 When soldering the microprocessor and signal processing ICs, use a ceramic soldering ir

8、on or a soldering iron whose metal part is grou- nded since they are not resistant to static electricity. 1.3.1.3 When removing the solder or soldering the laser shorting lands for the Pickup Block, use a ceramic soldering iron or a soldering iron wh- ose metal part is grounded since the laser diode

9、 or not resistant to static electricity. CAUTION- INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCKS DEFEATED AVOID EXPOSURE TO BEAM. VORSICHTI- UNSICHTBARE LASERSTRAHLUNG TRITT AUS. WENN DECKEL GEOFFNET UND WENN SICHERHEITSVERRIEGELUNG uBERBRuCKT IST. NICHT DEM STRAHL AUSSETZENI VARNING- OSYNLIG LA

10、SERSTRALNING NAR DENNA DEL AR OPPNAD OCH SPARR AR URKOPPLAD STRALEN AR FARLIG. ADVARSEL- USYNLIG LASERSTRALING VED ABNING NAR SIKKERHEADSAFBRYDERE ER UDE AF FUNKTION. UNDGA UDSAETTELSE FOR STRALING. CLASS 1 LASER PRODUCT LUOKAN 1 LASERLAITE KLASS 1 LASERAPPARAT Page 3 1.3.2. DVD Loading Unit Precaut

11、ions When handing the Mechanism Block 1.3.2.1 Do not loosen any screws in the Pickup Block. 1.3.2.2 Do not adjust any screws in the Mechanism Block except for Tilt Adjust Screws, as they are adjusted precisely at the factory. 1.3.2.3 Replacement of the Pickup Block is impossible. Always repl- ace th

12、e Traverse Asss when the Pickup Block needed to be replace . Do not touch the lens or lens holder of the Pickup Block. 1.3.2.4 The Guide Rails of the Pickup Block are greased. Take care wh- en handing. 1.3.2.5 When you try to slide the Pickup Block, do not press or pull it directly, Always turn the

13、dive gears with your fingers. 1.3.2.6 Be sure that the anti- slipping rubber on the turnable or clean. If there is dust or it is greasy,clean the part with the liquid that contains 50% each of alcohol and water. 1.3.2.7 When removing the Mechanism P.C.B. Asss, you need to sho- rt- circuit the laser

14、diode shorting lands beforehand. 1.4. Software Upgrade You can upgrade DVD player using the software we provide as following step: The CD- R update is below lists: First, burn CDR for upgrade. Dummy files are needed minimum 20Mbytes. The burning software is Nero burning soft: 1. Volume name: MTK 2.

15、Files name and type: MEDIATEK .BIN ( This file must locate Root directory) 3. CD- R burn type(formate): ISO9660 Model 1 ISO1 (level 1) dont choice Jolient dont choice loosen ISO strict Notice: MTK and MEDIATEK .BIN are upper case. The CD upgrade process: After the servo read the CD- R data ,Show Mes

16、sage on TV : Page 4 UPGRADE FILE DETECTED UPGRADE ? PRS CHOOSE (1- 8Bit 2- 16Bit) Press 1 key , Show Message on TV UPGRADE FILE DETECTED UPGRADE ? File Copy The tray is automatic to open, take disc away. UPGRADE FILE DETECTED UPGRADE ? Upgrading At this time, please wait a few minutes, DVD is downlo

17、ading code to flash, After Logo will be show on TV again, the update process finish. Notice: During upgrading , dons turn off power. Displaying the software Version Number After opening the tray, press the following keys on the remote control , DISPLAY (Up) (Down) (Left) (Right) then the software ve

18、rsion number appears. Page 5 Page 6 MPEG Circuit Diagram and Component Layout Page 7 MPEG Circuit Diagram and Component Layout Page 8 MPEG Circuit Diagram and Component Layout Page 9 MPEG Circuit Diagram and Component Layout Page 10 MPEG Circuit Diagram and Component Layout Page 11 POWER Circuit Dia

19、gram POWER Circuit Top silk POWER Circuit Bottom silk Page 12 SCART PCB Diagram Karaoke Circuit PCB Diagram 3.2. Read Disc Trouble Service Flow Chart Read disc problem in a DVD player is a very complicated issue that may involve complex issues. This problem is not only relation to the electronic cir

20、cuit, but also very much relation to the operation environment. DVD loading unit is a very complicate part that contains big number of ESD com- ponents , which require specific equipment, tools and technique to repair; In ge- neral, service technician is not suggested to disassemble the DVD loading

21、unit. It is suggest proving the trouble and replacing the complete DVD loading unit, in- stead of repairing the DVD loading unit in local workshop. It is suggested to prove the faulty of a DVD loading unit by replacement by a good DVD loading unit. Before checking the NO DISCTrouble, ensure excludin

22、g the following possi- bilities: The test disc is damage. AC power supply voltage dropped below the minimum required level. DVD disc region code and color system is not matching to the DVD player or system setting. Moisture condensed inside the unit. (Power on the unit, without disc loaded, for 1 / 2 to 2 hours). Service Flow Chart Read DISC Trouble Check DVD LOADER Connector Condition Replace DVD Loading Unit Check the MPEG ATAPI I/F Interface Circuit Replace Connector Check the other Parts by Replacement Method OK NG NG Page13