Zenith-DVT654-dvd-sm电路图 维修手册.pdf

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1、SERVICE MANUAL Product Type: 5 DISC DVD HOME THEATER Chassis: CMR-0538 Manual Series: DVT654 Manual Part #: 3829RGN005H Model Line: C Product Year: 2006 GENERAL ELECTRICAL EXPLODED VIEWS SPEAKER PART REPLACEMENT PARTS LIST 1 2 3 4 5 . . . . . Published March 2006 by Technical Publications Zenith Ele

2、ctronics Corporation 201 James Record Road Huntsville, Alabama 35824-1513 Copyright 2006 by Zenith Electronics Corporation Printed in U.S.A Model Series: CONTENTS DVT654 RadioFans.CN 收音机爱 好者资料库 - 1-1 - CONTENTS SECTION 1.GENERAL SERVICING PRECAUTIONS . 1-2 ESD PRECAUTIONS. 1-4 SPECIFICATIONS.1-5 SEC

3、TION 2. ELECTRICAL AUDIO TROUBLESHOOTING GUIDE . 2-1 DVD TROUBLESHOOTING GUIDE. 2-5 DVD DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING. 2-13 WIRING DIAGRAM. 2-25 BLOCK DIAGRAMS. 2-26 AUDIO PART SCHEMATIC DIAGRAMS . 2-31 DVD PART SCHEMATIC DIAGRAMS. 2-47 PRINTED CIRCUIT DIAGRAMS . 2-53 CIRCUIT VO

4、LTAGE CHART. 2-63 SECTION 3. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION . 3-1 DECK MECHANISM EXPLODED VIEW . 3-3 PACKING ACCESSORY SECTION . 3-5 SECTION 4. SPEAKER PART.4-1 SECTION 5. REPLACEMENT PARTS LIST .5-1 RadioFans.CN 收音机爱 好者资料库 - 1-2 - SECTION 1. GENERAL SERVICING PRECAUTIONS NOTES REGARD

5、ING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subjected to external pressure or impact. 2. Repair notes 1) The pick-up incorporates a strong magnet, and so shoul

6、d never be brought close to magnetic materials. 2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or damage to the printed-circuit board

7、. 3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason the adjustment point and installation screws should absolutely never be touched. 4) Laser beams may damage the eyes! Absolutely never permit laser beams to enter the eyes! Also NEVER switc

8、h ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged. 5) Cleaning the lens surface If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used for camera lens). The lens is held by a delicate spring. When cleaning the lens

9、surface, therefore, a cot- ton swab should be used, taking care not to distort this. 6) Never attempt to disassemble the pick-up. Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do not use any other liquid cleaners, because they will damage the

10、 lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up. Storage in conductive bagDrop impact NEVER look directly at the laser beam, and dont let contact fingers or other exposed skin. Magnet How to hold the pick-up Conductive Sheet C

11、otton swab Pressure Pressure RadioFans.CN 收音机爱 好者资料库 - 1-3 - NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such s

12、tatic electricity is high voltage, components can be damaged, and for that reason components should be handled with care. 2) The pick-up is composed of many optical components and other high-precision components. Care must be taken, therefore, to avoid repair or storage where the temperature of humi

13、dity is high, where strong magnet- ism is present, or where there is excessive dust. 2. Notes for repair 1) Before replacing a component part, first disconnect the power supply lead wire from the unit 2) All equipment, measuring instruments and tools must be grounded. 3) The workbench should be cove

14、red with a conductive sheet and grounded. When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is because there is the possibility of damage by static electricity.) 4) To prevent AC leakage, the metal part of the soldering iron should be grounded. 5) Wo

15、rkers should be grounded by an armband (1M ) 6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent static electricity changes in the clothing to escape from the armband. 7) The laser beam from the pick-up should NEVER be directly facing the eye

16、s or bare skin. Resistor (1 Mohm) Conductive Sheet Resistor (1 Mohm) Armband - 1-4 - ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices

17、 (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconductor

18、 component 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

19、unit under test. 2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive sur- face 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 devices. 4

20、. Use only an anti-static solder removal device. 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 remo

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

22、protective material from the leads of a replacement ESD device, touch the protective material to the chassis or circuit assembly into which the device will by installed. CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER SAFETY PRECAUTIONS. 8. Minimize bodily moti

23、ons when handing 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 gener- ate static electricity sufficient to damage an ESD device). CAUTION. GRAPHIC SYMBOLS THE LIGHTNING FLASH W

24、ITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DAN- GEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT

25、THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. - 1-5 - SPECIFICATIONS GENERAL Power supply Refer to main label Power consumption Refer to main label Mass 5.5 kg External dimensions (W x H x D) 435 x 54 x 350 mm Operating conditions Temperature: 5C to 35C

26、, Operation status: Horizontal Operating humidity 5% to 85% CD/DVD Laser Semiconductor laser, wavelength 650 nm Signal system NTSC 525/60 Frequency response (audio) 150 Hz to 18 kHz Signal-to-noise ratio (audio) More than 75 dB (1 kHz, NOP -6 dB, 20 kHz LPF/A-Filter) Dynamic range (audio) More than

27、70 dB Harmonic distortion (audio) 0.5 % (1 kHz, at 1W position) (20 kHz LPF) VIDEO Video input 1.0 V (p-p), 75 , negative sync., RCA jack x 2 Video output 1.0 V (p-p), 75 , negative sync., RCA jack x 1 S-video output (Y) 1.0 V (p-p), 75 , negative sync., Mini DIN 4-pin x 1 (C) 0.3 V (p-p), 75 COMPON

28、ENT VIDEO OUT(Y) 1.0 V (p-p), 75 ohms, negative sync, RCA jack x 1 (Pb)/(Pr) 0.7 V (p-p), 75 ohms, RCA jack x 2 TUNER FM Tuning Range 87.5 - 108.0 MHz or 65.0 - 74.0 MHz, 87.5 - 108.0 MHz Intermediate Frequency 10.7 MHz Signal-to Noise Ratio 60 dB (Mono) Frequency Response 150 - 8,000 Hz AMMW Tuning

29、 Range 520 - 1,720 kHz Intermediate Frequency 450 kHz AMPLIFIER Stereo mode 150W + 150W (6 at 1 kHz, THD 10 %) Surround mode Front: 150W + 150W (THD 10 %) Center*: 150W Surround*: 150W + 150W (6 at 1 kHz, THD 10 %) Subwoofer*: 250W (4 at 30 Hz, THD 10 %) SPEAKERS Front/Rear Speaker Center speaker Pa

30、ssive Subwoofer (LHS-75SGS) (LHS-75SGC) (LHS-75SGW) Type 2 Way 2 Speaker 2 Way 2 Speaker 1 Way 1 Speaker Impedance 6 6 4 Frequency Response 145 - 20,000 Hz 120 - 20,000 Hz 50 - 1,500 Hz Sound Pressure Level 85 dB/W (1m) 85 dB/W (1m) 83 dB/W (1m) Rated Input Power 150 W 150 W 250 W Max. Input Power 3

31、00 W 300 W 500 W Net Dimensions (W x H x D) 104 x 235 x 120 mm 220 x 115 x 120 mm 195 x 398 x 419 mm Net Weight 1.0kg 1.0kg 6.6kg (* Depending on the sound mode settings and the source, there may be no sound output.) - 2-1 - AUDIO TROUBLESHOOTING GUIDE INSERT POWER CORD. RED LED ON? IS POWER ON? CHE

32、CK POWER PLUG AND POWER SUPPLY CIRCUIT . DOES INITIAL READ WORK? DOES IT PLAY? YES NO YES YES OK NO YES NO NO CHECK POWER SUPPLY CIRCUIT . CHECK LASER CIRCUIT . CHECK TRACKING SERVO CIRCUIT. TURN POWER ON. CHECK FOCUS CIRCUIT. CHECK DISC. DOES IT OUTPUT AUDIO? YES NO CHECK AUDIO CIRCUIT. 1. POWER CH

33、ECK FLOW SECTION 2. ELECTRICAL - 2-2 - 2. AUDIO -COM CIRCUIT POWER ON Does DVD Error appear at FLD? Does AV 1/2 FM87.5 appear at FLD? Check Connector(PN902) Check power part of Main B/D. Check oscillator of x101. Check if IC101 PIN80 is High. Check if IC101 PIN92 is High. Check if IC101 PIN 31, 32,

34、51, 88 are high (5V). Check if IC101 PIN96 is High. Replace IC101. Does CD/DVD appear at FLD? Reconnect PN902. Refer to SMPS OK. Refer to oscillator Circuit. Check DVD Reset Waveform. Check IC101 Reset Wavefrom. Check 5V line. Check Power section Circuit. Does READING appear at FLD? Does no Disc or

35、Time appear at FLD? Check if DVD an Audio Micom Interface is OK. Check power. Check DVD Module. Check SMPS. - 2-3 - 3. FRONT CIRCUIT (1/2) PIN104 Pins PIN : -27V PIN 6 : -18V PIN7 : -22V PIN : 5V - 2-4 - 4. FRONT CIRCUIT (2/2) CHECK IF R029, R036R040, R046R051 OK. REPLACE R029, R036R040, R046R051 Ch

36、eck if PN104 pins10, 11 Waveform OK. Check if the Remocon Waveform of the PN104 pin16 - 2-5 - Does READING appear at FLD? Check Connector(CN201) if is normally. Check Connector CN202 Check Connector CN203 Check voltage each pin for PN902 Check Connector PN902 Check DVD SECTION Check SMPS board regul

37、ator 1. POWER CHECK FLOW DVD TROUBLESHOOTING GUIDE - 2-6 - 2. SYSTEM OPERATION FLOW Power On 1. 8032 initializes SERVO, DSP & RISC registers 2. Write RISC code to SDRAM 3. Reset RISC Show LOGO Tray Closed? Tray Close to Closed position NO SLED at Inner Side ? SLED Moves to Inner Positi on NO YES YES

38、 Reci eve OPEN/CLOSE Key? 1. Execute Pressed Key & IR Key 2. System operation Routine Loop NO 1. Stop Playback & Open Tray 2. Display tray open message & LOGO Receive CLOSE Key? NO YES YES 1. Judge whether have disc and disc type 2. Jump to related disc reading procedure - 2-7 - 3. TEST & DEBUG FLOW

39、 TEST NO Replace power PCBA or AC transformer. YES Switch on the Power PCBA Repair or Replace Power PCBA NO Make sure the main PCBA dont short on VCCs and switch it on. YES Check the regulators or related diodes. NO YES Connect to PC RS232 Cable and update the FLASH memory code. Update FLASH success

40、fully? A YES NO 1. Check 27MHz system clock. 2. Check system reset circuit. 3. Check FLASH R/W enable signal PRD,RWR. 4. Check RS232 SIGNALS. 5. Check FLASH Memory related circuit. Check the AC Voltage Power PCBA(120V) Is the DC Voltage outputs OK? (5V,3.3V, 8V, 12V, -12V, 11.5V) Is 3.3V and 1.8V DC

41、 outputs normal on main PCBA? - 2-8 - A RESET or Power On. NONO YES NO YES NO YES YES B NO NO NO YES YES NO NO YESYES YES Show LOGO? Flash Memory operates properly? Check connection lines between FLASH & MT1389 and the FLASH access time whether is suitable or not. SDRAM works properly? Check connect

42、ion lines between SDRAM & MT1389 and the SDRAM is damaged. MT1389 VIDEO outputs properly? Check the related circuit of MT1389. Have TV signal output? Check the filtering and amp circuit of TV signal. Check AV cable connection to TV set. Does Tray move inside when it is not at closed position? Normal

43、 TROUT & TRIN signals? Check the load OPEN & CLOSE switch Normal TRCLOSE & TROPEN signal? Normal LOAD+ & LOADsignal? Check the cable connection between main PCBA and loader. Check the Tray control IO pins on MT1389 & IP4504. Check the Tray control amplifying circuit on Motor driver. - 2-9 - B NONO N

44、O NO NONO NO YESYES YES YES YESYES YES Does the SLED move to inner side when it is at outter position? Motor Driver STBY Pin is High? Check the connection line of STBY signal. Is FMSO DC Level higher than 1.4V? Check the related circuit of FMSO. SL+ and SL- output properly? Check the amp circuit on motor driver. Check the cable connection with MECHA. Do not put in disc and tray close. C Optical Lens has movements for searching F