Zenith-DVB318-dvd-sm电路图 维修手册.pdf

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1、SERVICE MANUAL Product Type: DVD VIDEO PLAYER Chassis: DP7 (MD) Manual Series: DVB318 Manual Part #: 3829RHN004A Model Line: D Product Year: 2003 Summary ? 1 Cabinet & Main Chassis?2 Electrical?3 Mechaunism?4 Parts List?5 Published September 2003 by Technical Publications Zenith Electronics Corporat

2、ion 201 James Record Road Huntsville, Alabama 35824-1513 Copyright 2003 by Zenith Electronics Corporation Printed in U.S.A Model Series: CONTENTS DVB318 . . . . . . RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 1-1 SECTION 1 SUMMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS.

3、1-2 SERVICING PRECAUTIONS. 1-3 General Servicing Precautions Insulation Checking Prodedure Electrostatically Sensitive Devices SPECIFICATIONS. 1-4 RadioFans.CN 收音机爱 好者资料库 1-2 IMPORTANT SAFETY NOTICE This manual was prepared for use only by properly trained audio-video service technicians. When servi

4、cing this product, under no circumstances should the original design be modified or altered without permission from Zenith Electronics Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must con

5、form to original layout upon completion of repairs. Special components are also used to prevent x-radiation, shock and fire haz- ard. These components are indicated by the letter “x” included in their compo- nent designators and are required to maintain safe performance. No deviations are allowed wi

6、thout prior approval by Zenith Electronics Corporation. Circuit diagrams may occasionally differ from the actual circuit used. This way, implementation of the latest safety and performance improvement changes into the set is not delayed until the new service literature is printed. CAUTION: Do not at

7、tempt to modify this product in any way. Never perform customized installations without manufacturers approval. Unauthorized modi- fications will not only void the warranty, but may lead to property damage or user injury. Service work should be performed only after you are thoroughly familiar with t

8、hese safety checks and servicing guidelines. GRAPHIC SYMBOLS The exclamation point within an equilateral triangle is intended to alert the service personnel to important safety information in the service literature. The lightning flash with arrowhead symbol within an equilateral tri- angle is intend

9、ed to alert the service personnel to the presence of noninsulated “dangerous voltage” that may be of sufficient magni- tude to constitute a risk of electric shock. The pictorial representation of a fuse and its rating within an equi- lateral triangle is intended to convey to the service personnel th

10、e following fuse replacement caution notice: CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED NEAR EACH FUSE. SERVICE INFORMATION While servicing, use an isolation transformer for protection from AC line shock. After the original servi

11、ce problem has been corrected, make a check of the fol- lowing: FIRE AND SHOCK HAZARD 1. Be sure that all components are positioned to avoid a possibility of adjacent component shorts. This is especially important on items trans-ported to and from the repair shop. 2. Verify that all protective devic

12、es such as insulators, barriers, covers, shields, strain reliefs, power supply cords, and other hardware have been reinstalled per the original design. Be sure that the safety purpose of the polarized line plug has not been defeated. 3. Soldering must be inspected to discover possible cold solder jo

13、ints, solder splashes, or sharp solder points. Be certain to remove all loose foreign par- ticles. 4. Check for physical evidence of damage or deterioration to parts and compo- nents, for frayed leads or damaged insulation (including the AC cord), and replace if necessary. 5. No lead or component sh

14、ould touch a high current device or a resistor rated at 1 watt or more. Lead tension around protruding metal surfaces must be avoided. 6. After reassembly of the set, always perform an AC leakage test on all exposed metallic parts of the cabinet (the channel selector knobs, antenna terminals, handle

15、 and screws) to be sure that set is safe to operate without danger of electrical shock. DO NOT USE A LINE ISOLATION TRANS- FORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15 mfd

16、 150V AC type capacitor between a known good earth ground water pipe, conduit, etc.) and the exposed metal- lic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor and repeat AC voltage m

17、easurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit consti- tutes a potential shock hazard and must be corrected immediately. TIPS ON PROPER INSTALLATION 1. Never install any receiver in a cl

18、osed-in recess, cubbyhole, or closely fitting shelf space over, or close to, a heat duct, or in the path of heated air flow. 2. Avoid conditions of high humidity such as: outdoor patio installations where dew is a factor, near steam radiators where steam leakage is a factor, etc. 3. Avoid placement

19、where draperies may obstruct venting. The customer should also avoid the use of decorative scarves or other coverings that might obstruct ventilation. 4. Wall- and shelf-mounted installations using a commercial mounting kit must follow the factory-approved mounting instructions. A product mounted to

20、 a shelf or platform must retain its original feet (or the equivalent thickness in spacers) to provide adequate air flow across the bottom. Bolts or screws used for fasteners must not touch any parts or wiring. Perform leakage tests on customized installations. 5. Caution customers against mounting

21、a product on a sloping shelf or in a tilt- ed position, unless the receiver is properly secured. 6. A product on a roll-about cart should be stable in its mounting to the cart. Caution the customer on the hazards of trying to roll a cart with small cast- ers across thresholds or deep pile carpets. 7

22、. Caution customers against using extension cords. Explain that a forest of extensions, sprouting from a single outlet, can lead to disastrous conse- quences to home and family. A.C. Voltmeter 1500 OHM 10 WATT Place this probe on each exposed metal part. Good Earth Ground such as the Water Pipe, Con

23、duit, etc. 0.15uF PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS 1-3 SERVICING PRECAUTIONS CAUTION : Before servicing the DVD covered by this service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE : if unforeseen circum- stances create conflict between the

24、 following servicing pre- cautions and any of the safety precautions in this publica- tions, always follow the safety precautions. Remembers Safety First: General Servicing Precautions 1. Always unplug the DVD AC power cord from the AC power source before: (1)Removing or reinstalling any component,

25、circuit board, module, or any other assembly. (2)Disconnection or reconnecting any internal electrical plug or other electrical connection. (3)Connecting a test substitute in parallel with an elec- trolytic capacitor. Caution : A wrong part substitution or incorrect polarity installation of electrol

26、ytic capacitors may result in an explosion hazard. 2. Do not spray chemicals on or near this DVD or any of its assemblies. 3. Unless specified otherwise in this service data, clean electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cotton-ti

27、pped swab, or comparable soft applicator. Unless specified otherwise in this service data, lubrication of contacts is not required. 4. Do not defeat any plug/socket B+ voltage interlocks with whitch instruments covered by this service manual might be equipped. 5. Do not apply AC power to this DVD an

28、d/or any of its electrical assemblies unless all solid-state device heat sinks are cerrectly installed. 6. Always connect test instrument ground lead to the appropriate ground before connection the test instrument positive lead. Always remove the test instrument ground lead last. Insulation Checking

29、 Procedure Disconnect the attachment plug from the AC outlet and turn the power on. Connect an insulation resistance meter(500V) to the blades of the attachment plug. The insulation resis- tance between each blade of the attachment plug and acces- sible conductive parts (Note 1) should be more than

30、1M- ohm. Note 1 : Accessible Conductive Parts including Metal pan- els, Input terminals, Earphone jacks, etc. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive

31、 (ES) Devices. Examples of typical ES 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 semicon

32、ductor compo- nent or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commer- cially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying pow

33、er to the unit under test. 2. After removing an electrical assembly equipped with ES 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 grouned-tip soldering iron to solder or unsolder ES devic

34、es. 4. Use only an anti-static solder removal device. Some solder removal devices not classified a “anti-static” can generate electrical charges sufficient to damage ES devices. 5. Do not use freon-propelled chemicals. These can generate electrical charge sufficient to damage ES devices. 6. Do not r

35、emove a replacement ES device from its protec tive 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 material). 7. Immediately before removing th

36、e protective material 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 mot

37、ions when handling unpackaged replacement ES devices. (Normally harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static elec- tricity sufficient to damage an ES device.) 1-4 SPECIFICATIONS GENERAL Power requirementsAC

38、 120 V , 60 Hz Power consumption14W Dimensions (Approx.)430 x 48 x 242 mm (16.9 x 1.9 x 9.5 inches) (W x H x D) Weight (Approx.)2.34 kg (5.2 lbs) Operating temperature5 C to 35 C (41 F to 95 F) Operating humidity5 % to 90 % SYSTEM Laser Semiconductor laser Signal systemNTSC Frequency responseDVD (PC

39、M 96 kHz): 8 Hz to 44 kHz DVD (PCM 48 kHz): 8 Hz to 22 kHz CD: 8 Hz to 20 kHz Signal-to-noise ratioMore than 100 dB (ANALOG OUT connectors only) Harmonic distortionLess than 0.008% Dynamic rangeMore than 90 dB (DVD/CD) OUTPUTS VIDEO OUT1.0 V (p-p), 75 , negative sync, RCA jack x 1 S-VIDEO OUT(Y) 1.0

40、 V (p-p), 75 , negative sync, Mini DIN 4-pin x 1 (C) 0.3 V (p-p) 75 COMPONENT VIDEO OUT(Y) 1.0 V (p-p), 75 , negative sync, RCA jack x 1 (Pb)/(Pr) 0.7 V (p-p), 75 , RCA jack x 2 (480p, 720p, 1080i) DVI-D DIGITAL OUTDVI-D Single Link connector x 1 (480p, 720p, 1080i) Digital Audio output (Coaxial)0.5

41、 V (p-p), 75 , RCA jack x 1 Digital Audio output (Optical)3.0 V (p-p), 75 , Optical connector x 1 Analog Audio output2.0 Vrms (1 kHz, 0 dB), 600 , RCA jack (L, R) x 1 ACCESSORIES Component video cable1 DVI-type cable1 S-Video cable1 Video cable1 Audio cable1 Remote control1 Batteries2 2-1 SECTION 2

42、CABINET & MAIN CHASSIS CONTENTS 1. EXPLODED VIEWS.2-2 1. Cabinet and Main Frame Section.2-2 2. Packing Accessory Section.2-3 2-2 EXPLODED VIEWS 1. Cabinet and Main Frame Section 463 463 250 A00 463 463 300 283 280 A47 A47A A48 A44 A43 A50 A46 260 261 261 463 320 463 467 463 465 452 SCART&5.1CH MODEL

43、 ONLY OPTIONAL PART A 5 4 3 2 1 BCD 2-3 2. Packing Accessory Section BATTERY808 PACKING SHEET804 PACKING OPTIONAL PARTS 803 806 OWNERS MANUAL CABLE DIN 810CABLE ASSY 801 REMOCON900 BOX CARTON802 PACKING803 811 812 PLUG ASSY(1WAY(YELLOW) 814 CABLE, COAXIAL (DVI CABLE MOLEX) 815 CABLE, COAXIAL (3WAY R

44、CA COMPONENT) PLUG ASSY(2WAY) 3-1 SECTION 3 ELECTRICAL CONTENTS ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS. 3-2 1. System Clock X501 (27Mhz).3-2 2. Initializing between MPEG and SDRAM.3-2 3. Initializing between MPEG(FLI2301B) and Flash .3-3 4. Sil170B is nitialized by M-Reset and D-Reset .3-3 5. Reference Voltage 1.3-3 6. Reference Voltage 2.3-4 7. Checking the initial step of M/D Assy.3-4 8. Checking the Video Signal.3-5 9. Checking the first step of servo (1).