Akai-DVP-3470-S-3570-S-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL Model: DVP3470S/SK DVP3570S/SK/DS/DSK/DPSK DVD PLAYER www.akai.ru RadioFans.CN 收音机爱 好者资料库 CONTENTS 1. PRECAUTIONS-1 1-1 SAFETY PRECAUTIONS-1 1-2 SERVICING PRECAUTIONS-2 1-2-1 General Serving Precautions-2 1-2-2 Insulation Checking Procedure-3 1-3 ESD PRECAUTIONS-3 2. REFERENCE INFORMA

2、TION-4 2-1 COMPONENT DESCRIPTIONS-4 2-1-1 DVD ATAPI Loader -4 2-1-2 NTSC/PAL Digital Video Encoder (CS4955) -6 2-1-3 DVD Processor Chip (MT1369AE) -8 2-1-4 8-Pin, 24-Bit, 96kHz Stereo D/A CONVERTER (WM8720) - 17 2-1-5 Serial EEPROM, 2K (256 x 8) (24C16,ST-S08)- 20 2-1-6 8-Megabit (512 x 8) FLASH RAM

3、 (29F800) - 20 2-1-7 512K X 16 Bit X 2 Banks Synchronous DRAM (A43L0616) - 23 3. PRODUCT SPECIFICATIONS - 26 4. OPERATING INSTRUCTIONS -! . 4-1 BASIC CONNECTIONS-! . 4-2 Selecting Video Mode-24 4-2 Selecting the desired DVD Menu item- 25 4-4 Selecting the desired MP3 folder-26 4-5 Selecting the desi

4、red MP3 title- 27 4-6 Searching-28 4-7 Resume Play-29 4-10 Selecting Subtitle Language-31 4-11 Selecting Angle- -32 5. DISASSEMBLY AND REASSEMBLY- 27 6. TROUBLESHOOTING - 28 7. ELECTRICAL PART LIST - 29 8. BLOCK DIAGRAM - 35 9. CIRCUIT DIAGRAMS- 36 10. WIRING DIAGRAM- 44 RadioFans.CN 收音机爱 好者资料库 1 1-

5、1 Safety Precautions 1) Before returning an instrument to the customer, always make a safety check of the entire instrument, including, but not limited to, the following items: (1) Be sure that no built-in protective devices are defective or have been defeated during servicing. (1) Protective shield

6、s are provided to protect both the technician and the customer. Correctly replace all missing protective shields, including any remove for servicing convenience. (2) When reinstalling the chassis and/or other assembly in the cabinet, be sure to put back in place all protective devices, including, bu

7、t not limited to, nonmetallic control knobs, insulating fish papers, adjustment and compartment covers/shields, and isolation resistor/capacitor networks. Do not operate this instrument or permit it to be operated without all protective devices correctly installed and functioning. (2) Be sure that t

8、here are no cabinet opening through which adults or children might be able to insert their fingers and contact a hazardous voltage. Such openings include, but are not limited to, excessively wide cabinet ventilation slots, and an improperly fitted and/or incorrectly secured cabinet back cover. (3) L

9、eakage Current Hot Check-With the instrument completely reassembled, plug the AC line cord directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a leakage current tester or a metering system that complies with American National Standards institute (ANSI) C101.1

10、Leakage. Current for Appliances and underwriters Laboratories (UL) 1270 (40.7). With the instruments AC switch first in the ON position and then in the OFF position, measure from a known earth ground (metal water pipe, conduit, etc.) to all exposed metal parts of the instrument (antennas, handle bra

11、ckets, metal cabinets, screwheads, metallic overlays, control shafts, etc.), especially and exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5mA. Reverse the instrument power cord plug in the outlet and repeat the test. AC Leakage Test A

12、ny measurements not within the limits specified herein indicate a potential shock hazard that must be eliminated before returning the instrument to the customer. (4) Insulation Resistance Test Cold Check-(1) Unplug the power supply cord and connect a jumper wore between the two prongs of the plug. (

13、2) Turn on the power switch of the instrument. (3) Measure the resistance with an ohmmeter between the jumpered AC plug and all exposed metallic cabinet parts on the instrument, such as screwheads, antenna, control shafts, handle brackets, etc. When an exposed metallic part has a return path to the

14、chassis, the reading should be between 1 and 5.2 megohm. When there is no return path to the chassis, the reading must be infinite. If the reading is not within the limits specified, there is the possibility of a shock hazard, and the instrument must be re-pared and rechecked before it is returned t

15、o the customer. Insulation Resistance Test 2) Read and comply with all caution and safety related RadioFans.CN 收音机爱 好者资料库 2 notes non or inside the cabinet, or on the chassis. 3) Design Alteration Warning-Do not alter of add to the mechanical or electrical design of this instrument. Design alteratio

16、ns and additions, including but not limited to, circuit modifications and the addition of items such as auxiliary audio output connections, might alter the safety characteristics of this instrument and create a hazard to the user. Any design alterations or additions will make you, the service, respo

17、nsible for personal injury or property damage resulting there from. 4) Observe original lead dress. Take extra care to assure correct lead dress in the following areas: (1) near sharp edges, (2) near thermally hot parts (be sure that leads and components do not touch thermally hot parts), (3) the AC

18、 supply, (4) high voltage, and (5) antenna wiring. Always inspect in all areas for pinched, out-of-place, or frayed wiring. Do not change spacing between a component and the printed-circuit board, Check the AC power cord for damage. 5) Components, parts, and/or wiring that appear to have overheated

19、or that are otherwise damaged should be replaced with components, parts and/or wiring that meet original specifications. Additionally determine the cause of overheating and/or damage and, if necessary, take corrective action to remove and potential safety hazard. 6) Product Safety Notice-Some electr

20、ical and mechanical parts have special safety-related characteristics which are often not evident from visual inspection, nor can the protection they give necessarily be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics

21、are identified by shading, an () or a () on schematics and parts lists. Use of a substitute replacement that does not have the same safety characteristics as the recommended replacement part might created shock, fire and/or other hazards. Product safety is under review continuously and new instructi

22、ons are issued whenever appropriate. 1-2 Servicing Precautions CAUTION: Before servicing Instruments covered by this service manual and its supplements, read and follow the Safety Precautions section of this manual. Note: If unforeseen circument create conflict between the following servicing precau

23、tions and any of the safety precautions, always follow the safety precautions. Remember; Safety First 1-2-1 General Serving Precautions (1) a. Always unplug the instruments AC power cord from the AC power source before (1) removing or reinstalling any component, circuit board, module or any other in

24、strument assembly. (2) disconnecting any instrument electrical plug or other electrical connection. (3) connecting a test substitute in parallel with an electrolytic capacitor in the instrument. b. Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service man

25、ual might be equipped. c. Do not apply AC power to this instrument and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed. d. Always connect a test instruments ground lead to the instrument chassis ground before connecting the test instrument positiv

26、e lead. Always remove the test instrument ground lead last. Note: Refer to the Safety Precautions section ground lead last. (2) The service precautions are indicated or printed on the cabinet, chassis or components. When servicing, follow the printed or indicated service precautions and service mate

27、rials. (3) The components used in the unit have a specified flame resistance and dielectric strength. When replacing components, use components which have the same ratings, by () or by () in the circuit diagram are important for safety or for the characteristics of the unit. Always replace them with

28、 the exact replacement components. (4) An insulation tube or tape is sometimes used and some components are raised above the printed wiring board for safety. The internal wiring is sometimes clamped to prevent contact with heating components. Install such elements as they were. (5) After servicing,

29、always check that the removed screws, components, and wiring have been installed correctly 3 and that the portion around the serviced part has not been damaged and so on. Further, check the insulation between the blades of the attachment plus and accessible conductive parts. 1-2-2 Insulation Checkin

30、g Procedure Disconnect the attachment plug from the AC outlet and turn the power ON. Connect the insulation resistance meter (500V) to the blades of the attachment plug. The insulation resistance between each blade of the attachment plug and accessible conductive parts (see note) should be more than

31、 1 Megohm. Note: Accessible conductive parts include metal panels, input terminals, earphone jacks, etc. 1-3 ESD Precautions Electrostatically Sensitive Devices (ESD) Some semiconductor (solid static electricity) devices can be damaged easily by static electricity. Such compo9nents commonly are call

32、ed Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques of component damage caused by static electricity. (1) immediately before handling any semiconductor comp

33、onents or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit

34、 under test. (2) after removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. (3) Use only a grounded-tip soldering iron to solder or unsolder ESD device. (4) Us

35、e only an anti-static solder removal devices. Some solder removal devices not classified as “anti-static” can generate electrical charges sufficient to damage ESD devices. (5) Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD devices. (6) Do not rem

36、ove a replacement ESD device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive materials). (7) Immediately before removing the

37、 protective materials from the leads of a replacement ES device touch the protective material to the chassis or circuit assembly into which the device will be installed. CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. (8) Minimize bodily moti

38、ons when handling unpackaged replacement ESD devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ESD device). 4 2. Reference Information 2-1 Component Descri

39、ptions 2-1-1 DVD SANYO HD60 PUH Connector Pin Definition I/F Signals I/O Pin # F- 1 F+ 2 T+ 3 T- 4 C 5 D 6 CD/DVD 7 RF 8 A 9 B 10 F 11 GND-PD 12 VC 13 VCC 14 E 15 NC 16 VR-CD 17 VR-DVD 18 LD-CD 19 MD 20 HFM 21 NC 22 LD-DVD 23 GND-LD 24 5 4. Block Diagram MT1369 (RF AMP) Laser Driver Equalizer Error Gen MT1369 (Decode/Servo) ATAPI Buffer Manager Demodulator Error Correction PLI Focus low is ON, high is POWER OFF, Interal pull-down. 2 SC