NAD-M15ACH-sur-sm维修电路原理图.pdf
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1、SERVICE MANUAL SERVICE MANUAL M15 C/AH ? ? ? NAD 2007 NAD ELECTRONICS INTERNATIONAL TORONTO ? M15 C/AH SOUND PREAMPLIFIER SOUND PREAMPLIFIER S U R R O U N D S U R R O U N D M15 C/AH S U R R O U N D SOUND PREAMPLIFIER RadioFans.CN 收音机爱 好者资料库 CONTENTS SECTION 1 . . . .SUMMARY SECTION 2 . . . .CABINET
2、CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT,ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE A.C. VOLT- AGE ACROSS THE COMBINATION OF 1500OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE
3、A.C. PLUG AND REPEAT A.C. VOLTAGE MEASURE- MENTS FOR EACH EXPOSED METALLIC PART. VOLT- AGE MEASURED MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE COR- RECTED IMMEDIATELY. THE LIGHTNING FLASH WITH A
4、PROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “ DANGEROUS 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 THE SE
5、RVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. RadioFans.CN 收音机爱 好者资料库 SERVICING PRECAUTIONS CAUTION:Bef ore servicing the Surround sound preamplif ier covered by this service data and its supplements and addends, read and f ollow the SAFETY PRECAUTIONS. NOTE:
6、 if unf oreseen circumstances create conf lict between the f ollowing servicing precautions and any of the saf ety precautions in this publication, always f ollow the saf ety precautions. Remember Saf ety First: General Servicing Precautions 1. Always unplug the Surround sound preamplif ier AC power
7、 cord f rom the AC power source bef ore: (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 capacito
8、r. Caution: A wrong part substitute or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. 2. Do not spray chemicals on or near this Surround sound preamplif ier or any of its assemblies. 3. Unless specif ied otherwise in this service data, clean electrical
9、contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cotton tipped 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 wi
10、th which instruments covered by this service manual might be equipped. 5. Do not apply AC power to this Surround sound preamplif ier 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 appropr
11、iate ground bef ore connecting the test instrument positive lead. Always remove the test instrument 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
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