Akai-DVR-4045-DSS-Service-Manual(1) 电路图 维修手册.pdf

SERVICE MANUAL Models: DVR4045DSS DVR5000DSS DVD HOME THEATER SYSTEM www.akai.ru RadioFans.CN 收音机爱 好者资料库 Title Page 1. CONTENTS 2. BLOCK DIAGRAM (CABLE CONNECTIONS) 3. POWER SUPPLY 4. FUNCTIONAL DESCRITPIONS 4.1 DVD MPEG board 4.2 Front Panel 4.3 SMPS 4.4 DVD Driver 5. DESCRIPTION OF THE INTEGRATED CIRCUITS 5.1 SWPS TRANSFORMER 5.2 FRONT PANEL DRIVER IC FRO VIR (PT6311) 5.3 SWPS CONTROLLER IC (5M02659) 5.4 SWPS PROGAMMABLE SHUNT RE GULATOR (FAIRCHILD TL 431) 5.5 LINE FILTER(2 x 6.8mH) 2 3 4 1 4 10 10 12 13 13 14 18 22 23 1 1.CONTENTS 1 RadioFans.CN 收音机爱 好者资料库 2BLOCK DIAGRAM(CABLE CONNECTIONS) DVD Service Manual 1 2 RadioFans.CN 收音机爱 好者资料库 1 DVD Service Manual 3 MT1389DE/C 16M FLADH 64M SDRAM SEIAL EPROM AM/FM TUNER AUD2 AUD1 CVBS R G B DAC WMA8722 AUD0 4053 SURROUND L/R FRONT L/R L/R KARAOKE DOUT CENTRE/SUBWOOF 4.FUNCTIONAL DESCRIPTIONS 4.1DVD MPEG board 1 DVD Service Manual 4 1 DVD Service Manual 5 erefore . . . . . 1 DVD Service Manual 6 DVD Service Manual 7 1 DVD Service Manual 8 1 DVD Service Manual 9 PT6311S0791GC There are 3 different devices operated by the and (Optional): * Vacuum Fluorescent Display (VFD) * Push- buttons * VFDs There is an option for a tray lamp and a joystick which is not currently assembled. The VFD display is custom made, implemented in a 6 grids by 16 segment matrix. The VFD needs special voltage supply for operation: * Vkk which is - 21V needed to drive the segments and grids of the VFD. * Vf1, Vf2 which powers the exectron cloud filament (cathode) with a differential voltage of 3.5V. This is a floating voltage difference generated by the power supply, and is biased to - 21V in the ront panel board by a Zener circuit from the - 21V (Vkk) supply. Moving the bias towards a more positive number will reduce the segment brightness. Vf1 & Vf2 provide a DC supply to the cathode. To overcome the voltage difference between one end and the other of the cathode, it is geometrically titled so that the segments observe the same potential and have all the same brightness. Other way to overcome the problem is to employ an AC supply to power the Vf1 and Vf2. 4.3 SMPS The mains power(220VAC) fed from K1is filtered through 3C1, 3L1, 3C2 then rectified by D1,D2, D3 and D4 and generates an output at 300VDC. This 300VDC fed to 3TR1 (pin1, pin5) which connects to 5M02659R(pin3), then 5M02659R will automatically generate a 50KHz square waveform, this 50KHz square waveform controls the ON/OFF between 5M02659R pin1 and the ground. In normal condition, T1 primary (between pin2 and pin4) will create a 50KHz square waveform which is controlled by 5M02659R, this signal then fed to 3TR1 and generates 2 different potential voltages of 12V and 5V .The 12VDC and 5VDC then rectified by3D11 and then filtered by3 L2, 3R9, 3C18, 3CC25 and 3C11. The feedback voltage is controlled by Ic3 TL431 and IC2 PC817. When the output voltage is higher than 5V, the voltage at TL431(2.5V) is compared with R10 and send out a signal to 5M02659R, the output square waveform then will change to adjust the output voltage, this acts as a voltage stabilizer. 1 4.2.1 Front Panel Interface 6 Pin, Data Connector Pin Assignments PIN NAME I/O DESCRIPTION 1 DATA I IR sensor interrupt 2 CLK O Front Panel chip select 3 STB O Front Panel clock 4 GND O Front Panel Data output 5 VCC 6 REM I Front Panel Data input PIN NAME FROM DESCRIPTION 1 VFD 1 SMPS Segment and grid Voltage of the VFD 2VFD 2 SMPS Provide a DC supply to the cathode. To vercome the voltage difference between one and the other of 3 - 21V SMPS the cathode. 3Pin, Power Connector Pin Assignments DVD Service Manual 10 1 DVD Service Manual 11 1 DVD Service Manual 12 1 5. DESCRIPTION OF THE INTEGRATED CIRCUITS 5.1 SMPS TRANSFORMER 1. GENERAL INFORMATION Main Voltage Operations: Main Drop- out Voltage: Mains STart- up Voltage: Operating Frequency: 90Vac - 265 Vac Max. 90 Vac Max. 90 Vac 60 KHz 2. ELECTRICAL CHARACTERISTICS WINDING PrimaryInductance PIN.NO 2- 4 INDUCTANCE 6DESCRIPTION 1.5mH10% <0.50W 1. Primary Leakage inductance (Pin 2- 4) L1.5mH 2.2 WITHSTANDING VOLTAGE The transformer shall sithstanding a voltage of 4 Kvms for 1 minute and 1 mA between primary and seconday winding and also 2 Kvms for 1 minute and 1 mA between primary winding with core and secondary winding with core. 2.3 INSULATION RESISTANCE The insulation resistance shall be ore than 500M between primary and seconday windings when the applied voltage 300 Vdc for 1 minute 2.4 ELECTRICAL CHARACTERISTICS 1. Before taking measurement Pp01 will be to give 5.0Vdc on 5.0Vdc line at Minimum setting of controls and a mains voltage 220 Vac. 2. Before taking a measurement, DVD set should be working at least 5 minutes on Normal condition 2.1 STATIC CHARACTERISTICS DVD Service Manual 13 1 DVD Service Manual 5.2 FRONT PANEL DRIVER IC FOR VIR (PT6311) 5.2.1 General Description 14 1 DVD Service Manual 15 DVD Service Manual 1 16 1 DVD Service Manual 17 1 DVD Service Manual 5.3 SWPS CONTROLLER IC ()5M02659 18 1 DVD Service Manual 19 1 DVD Service Manual 20 1 DVD Service Manual 21 DVD Service Manual 22 1 DVD Service Manual 23