NAD-M15ACH-sur-sm维修电路原理图.pdf

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 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 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 APROWHEAD 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 SERVICE 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: 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 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 capacitor. 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 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 with 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 appropriate 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 plug. The insulation resistances between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1 M- ohm. Note 1: Accessible Conductive Parts including Metal panels, Input terminals, Earphone jacks, etc. Electro statically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electro statically 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. Immediately bef ore handing 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 shock reason 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 soldering 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 Freon propelled chemicals. These can generate electrical charge suf f icient to damage ES devices. 6. Do not remove a replacement ES device f rom its protective package until immediately bef ore you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive f oam, aluminum f oil, or comparable conductive material). 7. Immediately bef ore removing the protective material f rom 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 saf ety precautions. 8. Minimize bodily motions when handing unpackaged replacement ES devices. (Normally harmless motion such as the brushing together of your clothes f abric or the lif ting of your f oot f rom a carpeted f loor can generate static electricity suf f icient to damage an ES device.) 1- 3 RadioFans.CN 收音机爱 好者资料库 ADJUSTMENT PROCEDURE OSD VCO Osci l l ati on Frequency ( VIDEO BOARD) Connect M15 CVBS monitor out to a TV set. Pre ss “ Enter” key on remotecontrol to call OSD out. Then clockwiseadjust C1162 and observetheOSD till thecharacters arejust disappear, record theadjustment slot position A; then anticlockwiseC1162 to maketheOSD characters disappear and record theadjustment slot position B again. Adjust theadjustment slot position in themiddle ofA and B. Get in “ DISPLAY SETUP” OSD Menu and switch theunit in both “ NTSC” and PAL” mode, observetheOSD characters, they should beall stabledisplaying without any f licker. 1- 4 C1162 VIDEO BOARD SOFTWARE VERSI ON: TO DISPLAY SOFTWARE VERSIONS, PRESS FRONT PANEL video C1946C1960; C1963C1965; L19 63L1965 NI H65M15T00943 H65M15T01020 start f rom H65M15T01051 V2.0 HS4- M15_B008V3_1_0- PSU HS4- M15_B008V3_1_0- HDMI HS4- M15_B008V3_0_0- CSS HS4- M15_B008V3_1_0- AUD HS4- M15_B008V3_3_2- VIDEO HS4- M15_B008V3_0_1- FPP sof tware update start f rom H6YM15T01211 V2.0 HS4- M15_B008V3_1_0- PSU HS4- M15_B008V3_1_0- HDMI HS4- M15_B008V3_0_0- CSS HS4- M15_B008V3_2_0- AUD HS4- M15_B008V3_3_2- VIDEO HS4- M15_B008V3_1_0- FPP 1.C2252 C2254 change f rom 1nJ NPO 50V 0805 to 680PJ NPO 50V 2.ADD C2951 C2952 150PJ NPO 50V 3.C58,C511, C510,pitch change f rom 5mm to 2mm SECTION 5 VERSION HISTORY 5- 1 RadioFans.CN 收音机爱 好者资料库