User manual YORKVILLE NX520P

[. . . ] Use only with cart, stand, tripod, bracket, or table recommended by the manufacturer or sold with the product. Follow the manufacturer's instructions when installing the product and use mounting accessories recommended by the manufacturer. The apparatus should not be exposed to dripping or splashing water; no objects filled with liquids should be placed on the apparatus. Terminals marked with the "lightning bolt" are hazardous live; the external wiring connected to these terminals require installation by an instructed person or the use of ready made leads or cords. [. . . ] Cet appareil est équipé d'une prise d'alimentation polarisée. Ne pas utiliser cet appareil avec un cordon de raccordement à moins qu'il soit possible d'insérer complètement les trois lames. Des précautions doivent êtres prises afin d'eviter que le système de mise à la terre de l'appareil ne soit désengagé. Hazard: Ne pas placer cet appareil sur un chariot, un support, un trépied ou une table instables. L'appareil pourrait tomber et blesser quelqu'un ou subir des dommages importants. Utiliser seulement un chariot, un support, un trépied ou une table recommandés par le fabricant ou vendus avec le produit. Suivre les instructions du fabricant pour installer l'appareil et utiliser les accessoires recommandés par le fabricant. Il convient de ne pas placer sur l'appareil de sources de flammes nues, telles que des bougies allumées. L'appeil ne doit pas être exposé à des égouttements d'eau ou des éclaboussures et qu'aucun objet rempli de liquide tel que des vases ne doit être placé sur l'appareil. Les dispositifs marqués d'une symbole "d'éclair" sont des parties dangereuses au toucher et que les câblages extérieurs connectés à ces dispositifs de connection extérieure doivent être effectivés par un opérateur formé ou en utilisant des cordons déjà préparés. Power Cord: The AC supply cord should be routed so that it is unlikely that it will be damaged. If the AC supply cord is damaged DO NOT OPERATE THE UNIT. Service: The unit should be serviced only by qualified service personnel. Cordon d'alimentation: Évitez d'endommager le cordon d'alimentation. 9D V N 10 D V N 11 D V N 12 D V N 13 D V N 33U 16V 16V 33U C128 MODEL(S):- 100N C70 R217 100N C2 C1 RELAY 1C K1 C137 C139 50K 18K - NC R206 220R BASS P3 C126 R197 R191 R190 EF500P/NX520P M1159 /A VER-5. 00 M1159A. PCB_DATABASE_HISTORY 47K 75R B LIN LINE_GAIN R192 33U 16V P4 U32 10K0 10K0 R207 R203 RING-SW RING 1K0 1K0 C129 C94 R168 33P MIXER_INPUT J5 C127 20V0 1K2 4K7 10K0 10K0 33P B LIN 47N 10K 100N R195 4N7 R194 4K7 C138 + 332R0 1N4148 1K TRANS BLK W20 {WireGauge} AC WHITE NE5532N R160 SLEEVE RT V {4Amps} 1300UH RT V RT V 22N 275V NO R201 22U 50V 220R C108 L5 C106 M1159 /A C102 ETCH GUIDE D52 1N EF500P/NX520P VER-5. 00 1N5402 D55 RT V 250V D13 10K . 475 R218 2N5401 NE5532N MIXER R137 47K 1N4148 1N4148 220N B LIN B LIN R129 C140 68N 100N C40 MIC_GAIN TREBLE 2N2 47P NE5532N 47K R183 . 225 ETCH GUIDE U33 R144 R193 J6 J4 2 C84 R198 R188 R186 4K7 D. N. S. C117 AC BLACK W9 TRANS BLK D58 R132 R143 . 175 10K 10K 6K8 10K 10K D41 D45 R215 D63 D. N. S. 100N 100N RING-SW RING 10K0 10K0 R196 R209 3 MIC_INPUT Q16 4K7 C133 R167 R170 SLEEVE D. N. S. 10K P5 C93 10K 1K 4K7 . 475 R172 10K0 10K0 C107 RT V RT V 1N5402 D56 T7. 0 W17 C109 100N C105 R61 R177 22U 50V +24VRAIL R200 C112 R210 C125 R146 R204 47K 470K 1K 250V 680N R189 R205 1 4 W R130 RT V T7. 0 1N5402 W13 R98 R199 C121 TIP-SW TIP W21 NOL NOR NOR NCR NCR CR CR NS L-3 2S R2 100N 100N SOCKET SOCKET UPSIDE DOWN NORMAL 1K MR752 W6 D53 R2 2S L-3 NS D59 MR752 W23 NORMAL LARGE SOCKET WITH DIRECTION MR752 D61 TAB IRFP9140N R45 6K8 47N TO92 BLACK C91 BDX53C BDX53C IRFP140N TO220 YELLOW TO92 MC7915CT MC7815CT TO220 RED U30 TO220 BLACK FIELD SERVICE NOTE FOR: NX520P & EF500P May 27, 2002 We have experienced some failures with the short pilot runs of 520P and EF500P due to an incorrectly mounted resistor on the power board. There are only about a dozen of each of these in each of our market territories. These failures at first sight will seem somewhat intimidating due to the blackening soot which is produced when the resistor arcs out to the printed high voltage rails under the resistor designated R60. The damage looks far worse than it really is and is generally repairable by anyone with basic electronics and soldering skills. The greatest difficulty with servicing class "D" amplifiers is that most service people have never serviced one before. And, like all things new, they don't like being in unfamiliar water. When you have done a couple of these kinds of amps, you will realize that they are probably easier to repair than their linear counterparts. But there are two dramatic differences to be observed in testing this class of amp. They are: 1) You cannot soft start this type of amplifier as it has an error amplifier, which will deny start up at low voltage. [. . . ] The amp sends a test pulse upon startup which must be registered in the feedback loop before it will activate the driver chip. If there is no load there is no current in the output, if there is no current, there is no voltage and consequently no feedback pulse. The good news is that this class of amp will generally not cook off if you failed to repair it and then try to fire it up. It usually just sits there dumbfounded waiting for you to find the missing faulty bits. The process for repair of units suffering from an R60 arc over is as follows. [. . . ]