Nad-C-516-BEE-Service-Manual(1) 电路图 维修手册.pdf
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1、? ? ?6? ? ?6? RadioFans.CN 收音机爱 好者资料库 PRODUCT SAFETY SERVICING GUIDELINES. 1-4 SERVICING PRECAUTIONS . 1-5 * General Servicing Precautions * Insulation checking prodedure * Electrostatically Sensitive Devices SPECIFICATIONS . 1-6 EXPLODED VIEWS CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .1
2、5 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 CAPACITOR. REVERSE THE AC PLUG AND REPEAT AC VOLTAGE MEASUREMENTS FOR EACH EXPOSED
3、 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 SYMBOLS SUBJECT : TIPS ON PROPER INSTALLATION 1. NEVER INSTALL ANY PRODUCT IN A
4、 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, NEAR STEAM RADIATORS WHERE STEAM LEAKAGE IS A FACTOR, ETC. 3. AVOID PLACEMENT W
5、HERE 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 MOUNTING KIT MUST FOLLOW THE FACTORY APPROVED MOUNTING INSTRUCTIONS A PRODUCT MOUNTED
6、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 LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS. 5. CAUTION CUSTOMERS AGAINST THE MOUN
7、TING 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 TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS. 7.
8、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 SAME OR LARGER SCREEN SIZE. 8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION
9、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 ALERT THE USER TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” WITHIN THE PRO
10、DUCT 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 MAINTENANCE (SERVICING) INSTRUCTIONS IN THE LITERATURE ACCOMPANYING THE APPLIANCE
11、. PRODUCT SAFETY SERVICING GUIDELINES RadioFans.CN 收音机爱 好者资料库 1-5 SERVICING PRECAUTIONS CAUTION : Bef ore servicing the A/ V Receiver covered by this service data and its supplements and addends, read and f ollow the SAFETY PRECAUTIONS. NOTE : if unf oreseen circumstances create conf lict between th
12、e f ollowing servicing precautions and any of the saf ety precautions in this publication, always f ollow the saf ety precautions. Remember Safety First: General Servicing Precautions 1. Always unplug the A/ V Receiver AC power cord f rom the AC power source bef ore: (1) Removing or reinstalling any
13、 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 substitution or incorrect polarity installation
14、 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 specif ied otherwise in this service data, clean electrical contacts by applying an appropriate contact cleaning solution to the contacts with a
15、pipe cleaner, cottontipped swab, or comparable sof t applicator. Unless specif ied otherwise in this service data, lubrication of contacts is not required. 4. Do not def eat any plug/ socket B+ voltage interlocks with which instruments covered by this service manual might be equipped. 5. Do not appl
16、y 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 bef ore connecting the test instrument positive lead. Always remove the test instrument
17、ground lead last. Insulation Checking Procedure Disconnect the attachment plug f rom 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 attachment plug and accessible conductive p
18、arts (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. Such components commonly are cal
19、led Electrostatically Sensitive (ES) Devices. Examples of typical Es devices are integrated circuits and some f ield ef f ect transistors and semiconductor chip components. The f ollowing techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Imme
20、diately bef ore handling any semiconductor component or semiconductor-equipped assembly, drain of f 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 f or potential s
21、hock reasons prior to applying power to the unit under test. 2. Af ter removing an electrical assembly equipped with ES devices, place the assembly on a conductive surf ace such as aluminum f oil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grounded-tip solderi
22、ng iron to solder or unsolder ES devices. 4. Use only an antistatic solder removal device. Some solder removal devices not classif ied a “anti-static” can generate electrical charges suf f icient to damage ES devices. 5. Do not use f reonpropelled chemicals. These can generate electrical charge suf
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