Nad-L-54-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL L54 DVD RECEIVER NAD ELECTRONICS INTERNATIONAL TORONTO NAD 2007 RadioFans.CN 收音机爱 好者资料库 SERVICE MANUAL L54 DVD RECEIVER L54 DVD RECEIVER RadioFans.CN 收音机爱 好者资料库 1-3 SECTION 1 SUMMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES. 1-4 SERVICING PRECAUTIONS . 1-5 * General Servicing Prec

2、autions * Insulation checking prodedure * Electrostatically Sensitive Devices SPECIFICATIONS . 1-6 DISASSEMBLY . 1-7 PRINCIPAL PART LOCATION. 1-8 EXPLODED VIEW (AH) . 1-9 EXPLODED VIEW (C). 1-12 RadioFans.CN 收音机爱 好者资料库 1-4 CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY. NEVER PERFORM CUS

3、TOMIZED INSTALLATIONS WITHOUT MANUFACTURER S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROPERTY DAMAGE OR USER INJURY. SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAF

4、ETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER. WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM AC LINE SHOCK. SAFETY CHECKS AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRECTED. A CHECK SHOULD BE MADE OF THE FO

5、LLOWING. SUBJECT : FIRE CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD, 150V AC TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE AC VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAP

6、ACITOR. REVERSE THE AC PLUG AND REPEAT AC VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURE MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP AC ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY. SUBJECT : GRAPHIC

7、SYMBOLS SUBJECT : TIPS ON PROPER INSTALLATION 1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBYHOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO 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,

8、NEAR STEAM RADIATORS WHERE STEAM LEAKAGE IS A FACTOR, ETC. 3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILATION. 4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCAL MOUNTIN

9、G KIT MUST FOLLOW THE FACTORY APPROVED MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO 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

10、LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS. 5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED. 6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZARDS OF TRYIN

11、G TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS. 7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V. S OF THE

12、 SAME OR LARGER SCREEN SIZE. 8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS, EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SINGLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY. THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL, WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO A

13、LERT THE USER TO THE PRESENCE OF UNINSULATED “ DANGEROUS VOLTAGE” WITHIN THE PRODUCT S ENCLOSURE THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANT OPERATING AND M

14、AINTENANCE (SERVICING) INSTRUCTIONS IN THE LITERATURE ACCOMPANYING THE APPLIANCE. PRODUCT SAFETY SERVICING GUIDELINES 1-5 SERVICING PRECAUTIONS CAUTION : Before servicing the A/V Receiver covered by this service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE : if

15、unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions in this publication, always follow the safety precautions. Remember Safety First: General Servicing Precautions 1. Always unplug the A/V Receiver AC power cord from the AC power sou

16、rce before: (1) Removing or reinstalling any component, circuit board, module, or any other assembly. (2) Disconnecting or reconnecting any internal electrical plug or other electrical connection. (3) Connecting a test substitute in parallel with an electrolytic capacitor. Caution : A wrong part sub

17、stitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. 2. Do not spray chemicals on or near this A/V Receiver or any of its assemblies. 3. Unless specified otherwise in this service data, clean electrical contacts by applying an appropriate contact

18、 cleaning solution to the contacts with a pipe cleaner, cottontipped 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 which instruments covered by this service ma

19、nual might be equipped. 5. Do not apply AC power to this A/V Receiver and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed. 6. Always connect test instrument ground lead to the appropriate ground before connecting the test instrument positive lead.

20、 Always remove the test instrument ground lead last. Insulation Checking 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 resistance between each blade of the attachmen

21、t plug and accessible conductive parts (Note 1) should be more than 1M-ohm. Note 1 : Accessible Conductive Parts including Metal panels, Input terminals, Earphone jacks, etc. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity

22、. Such components commonly are called Electrostatically Sensitive (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

23、by static electricity. 1. Immediately before handling any semiconductor 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

24、 be removed for potential shock reasons prior to applying power 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 onl

25、y a grounded-tip soldering iron to solder or unsolder ES devices. 4. Use only an antistatic 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 freonpropelled chemicals. These can generate e

26、lectrical charge sufficient to damage ES devices. 6. Do not remove a replacement ES 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 compar

27、able conductive material). 7. lmmediately before removing the 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

28、observe all other safety precautions. 8. Minimize bodily motions when handing 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 electricity sufficient to damage an ES

29、 device.) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1-6 SPECIFICATIONS 1-7 ? ? ? 1-8 ? EXPLODED VIEW (L54AH) 1-91-10 1-11 EXPLODED VIEW (L54C) 1-121-13 1-14 ? ? ? ?. ?3 ? TRANSISTOR, REGULATOR IC PIN DESCRIPTION?30 ?31 ? 1. BLOCK DIAGRAM

30、. 2-34 2. WIRING DIAGRAM . 2-36 3. SCHEMATIC DIAGRAM . 2-47 4. PRINTED CIRCUIT BOARDS . 2-53 2-1 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 2-2 SOFT RESET METHOD ? ? 2-3 IC BLOCK DIAGRAMS ? ?345?.3?# 0.?,#47,. ?345?

31、$?/2 ?345?:?$?$?/ ?345?/?$-?/(?)*+,- . ?/?AB2 ?345?67% ?345? #?/ ? ? ? ? ? ? ? ?(? ?%?C(? )*+,-?. ? ? ?/2 ?345? ?345? !#?D* ?,#47,. ? ? ?/( ?%?C?/?)*+,- . ? ?$($? ? ? 2 ?345?C?/(? !# ?345?/?/? ? ? ? ? ? ? ? ? ? ? ? ? ? 2-33 8?$?8?$? ?$? ? ?%? !#?C(? C?/(? ? ?%?(? ? ?2 ?345? !#?+,0 ?*+)4?K$ ? ? ? ? ?

32、 ?345?:?A:?8 ?*+)4?K$ ? ? ? 1. BLOCK DIAGRAM 2-342-35 2. WIRING DIAGRAM 2-362-37 3. SCHEMATIC DIAGRAM FRONT PART 2-38 2-39 VIDEO PART 2-402-41 MCU PART 2-422-43 INPUT PART 2-442-45 AMP PART 2-46 2-47 MPEG PART 2-482-49 MPEG PART 2-502-51 4. PRINTED CIRCUIT BOARDS FRONT PCB DATA VIEW 2-522-53 INPUT PCB DATA VIEW (TOP) 2-542-55 INPUT PCB DATA VIEW (BOTTOM) 2-562-57 AMP PCB DATA VIEW 2-582-59 MPEG PCB DATA VIEW (TOP) 2-602-61 MPEG PCB DATA VIEW (BOTTOM) 2-622-63 SECTION 3 ELECTRICAL PARTS LIST 3-1 ? ? ? ? ? ? REF NO.PART NO.REMARKS ?