Akai DVP 4785 KDSM Service Manual

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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 INFORMATION------------------------------------------------------------------------------------------------4 2-1 COMPONENT DESCRIPTIONS---------------------------------------------------------------------------------------------------4 2-1-1 DVD SANYO HD60 PUH------------------------------------------------------------------------------------------------4 2-1-2 DVD Processor Chip MTK1389-----------------------------------------------------------------------------------------6 2-1-3 20-Pin, 24-Bit, 192kHz D/A with Volume Control (WM8766)-----------------------------------------------------12 2-1-4 Serial EEPROM, 2K (256 x 8) (24C02) or 16 K (2048 x 8) (24C16)---------------------------------------------13 2-1-5 8M-BIT [1Mx8/512Kx16] CMOS FLASH MEMORY---------------------------------------------------------------14 2-1-6 512K X 16 Bit X 2 Banks Synchronous DRAM (A43L0616)-------------------------------------------------------17 3. PRODUCT SPECIFICATIONS------------------------------------------------------------------------------------------------20 4. UPGRADING SYSTEM AND CHANGING THE REGION CODE---------------------------------------------------21 5. OPERATING INSTRUCTION-------------------------------------------------------------------------------------------------22 MAINTENANCE & TROUBLESHOOTING------------------------------------------------------------------------------------------23 6.DISASSEMBLY AND REASSEMBLY----------------------------------------------------------------------------------------25 7.TROUBLESHOOTING----------------------------------------------------------------------------------------------------------26 8. ELECTRICAL PART LIST-----------------------------------------------------------------------------------------------------27 9. BLOCK DIAGRAM--------------------------------------------------------------------------------------------------------------38 10. CIRCUIT DIAGRAMS---------------------------------------------------------------------------------------------------------40 11. WIRING DIAGRAM------------------------------------------------------------------------------------------------------------48

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1. PRECAUTIONS 1-1 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 shields 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, but 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 there 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) Leakage 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 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 brackets, 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 Any 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. (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 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 to the customer. Insulation Resistance Test 1 - Cosmic Digital Technology Limited -

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PIN Symbol Type Description 9 55 IOA4 Inout, pull up Microcontroller address 0/GPIO4 56 IOA5 Inout,pull up Microcontroller address 0/GPIO5 57 IOA6 Inout, pull up Microcontroller address 0/GPIO6 58 IOA7 Inout, pull up Microcontroller address 0/GPIO7 59 HIGHA0 Inout,pull up Microcontroller address 8 60 IOA18 nout,pull up Microcontroller address 0/GPIO18 61 IOA19 Inout,pull up Microcontroller address 0/GPIO19 62 DVSS GND GND 63 APLLCAP Analogue out Analogue output for PLL circuit 64 APLLVSS gnd gnd 65 APLLVDD3 Power 3.3V power 66 IOWR inout Flash write enable,active low /GPIO17 67 A16 output Flash address 16 68 HIGHA7 Inout,pull up Microcontroller address 15 69 HIGHA6 Inout,pull up Microcontroller address 14 70 HIGHA5 Inout,pull up Microcontroller address 13 71 HIGHA4 Inout, pull up Microcontroller address 12 72 HIGHA3 Inout, pull up Microcontroller address 11 73 DVDD3 Power 3.3V power 74 HIGHA2 Inout, pull up Microcontroller address 10 75 HIGHA1 Inout,pull up Microcontroller address 9 76 IOA20 Inout,pull up Microcontroller address 0/GPIO20 77 IOCS Inout,pull up Flash chip select,active low /GPIO18 78 IOA1 Inout,pull up Microcontroller address 0/GPIO2 79 IOOE Inout,pull up Flash output enable,active low /GPIO13 80 DVDD3 Power 3.3V power 81 AD0 Inout Microcontroller address/data 0 82 AD1 Inout Microcontroller address/data 1 83 AD2 Inout Microcontroller address/data 2 84 AD3 Inout Microcontroller address/data 3 85 DVSS gnd gnd 86 AD4 Inout Microcontroller address/data 4 87 AD5 Inout Microcontroller address/data 5 88 AD6 Inout Microcontroller address/data 6 89 IOA21/V_ADIN0 Inout, pull up Microcontroller address 0/GPIO21 90 ALE Inout, pull up Microcontroller address latch enable 91 AD7 Inout Microcontroller address/data 7 92 A17 output Flash address 17 93 IOA0 Inout,pull up/downMicrocontroller address 0/GPIO0 94 DVSS gnd gnd 95 UWR Inout,pull up/downUSB write 96 URD Inout,pull up/downUSB read 97 DVDD18 Power Power1.8V 98 UP1_2 Inout,pull up Microcontroller port 1-2 99 UP1_3 Inout,pull up Microcontroller port 1-3 100 UP1_4 Inout,pull up Microcontroller port 1-4 101 UP1_5 Inout,pull up Microcontroller port 1-5 102 UP1_6 Inout,pull up Microcontroller port 1-6 103 UP1_7 Inout,pull up Microcontroller port 1-7 104 UP3_0 Inout,pull up Microcontroller port 3-0 105 UP3_1 Inout,pull up Microcontroller port 3-1 106 UP3_4 Inout,pull up Microcontroller port 3-4 107 UP3_5 Inout,pull up Microcontroller port 3-5 108 DVDD3 Power 3.3V power 109 ICE Inout,pull down Microcontroller ICE mode enable 110 PRST Inout,pull down Power on reset input, active low 111 IR input IR control signal input 112 INT0 input Microcontroller interrupt 0,active low 113 DQM0 Output Mask for DRAM input/output byte 0

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2-1-6 512K X 16 Bit X 2 Banks Synchronous DRAM (A43L0616) Features ? JEDEC standard 3.3V power supply ? LVTTL compatible with multiplexed address ? Dual banks / Pulse RAS ? MRS cycle with address key programs - CAS Latency (2,3) - Burst Length (1,2,4,8 & full page) - Burst Type (Sequential & interleave) ? All inputs are sampled at the positive going edge of the system clock ? Burst Read Single-bit Write operation ? DQM for masking ? Auto & self refresh ? 64ms refresh period (4K cycle) ? 50 Pin TSOP (II) Pin Configuration 17

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7.Troubleshooting No power Insert the AC power plug securely into the power outlet. No picture Make sure that the equipment is connected properly. Make sure that the input setting for TV is Video (AV). No sound Make sure that the equipment is connected properly. Distorted sound Make sure that the input settings for the TV and stereo system are correct.No fast forward or fast reverse Some discs may have sections that prohibit fast forward or fast reverse. No proper aspect ratio Select the correct setup for TV aspect ratio that matches your TV set. No operations can be performed withthe remote controller Point the remote control unit at the remote control sensor and operate. Check the batteries are installed with the correct polarities. Remove the obstacles between the remote control unit and remote control sensor. No button operation Set the POWER button to OFF and then back to ON. Alternatively, turn off the power, disconnect the power plug and then reconnect it. Audio soundtrack and/or Subtitlelanguage is not the one you selected. If the audio soundtrack and /or subtitle language does not exist on the disc, the language selected at the initial settings will not be seen. No Angle change This function is dependent on software availability. Even if a disc has a number of angles recorded, these angles may be recorded for specific scenes only. 26

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10. Circuit Diagrams 1. Control Part 2. Index 3. SDRAM & FLASH 4. Servo-DSP MPEG 5. Video Output 6. Audio Output 7.Power Part 40