User manual HUGHES & KETTNER VX

[. . . ] VX Power Amps Manual 1. 2 English Deutsch Français Important Safety Instructions Before connecting, read instructions Important Advice on Safety!Please read before use and keep for later use! Wichtige Sicherheitshinweise!Bitte vor Gebrauch lesen und für späteren Gebrauch aufbewahren! · · · · · · · · · · · · · · · · · · · · · · · · · · Read all of these instructions!The product may fall, causing serious damage to the product or to persons! [. . . ] We recommend that you clean this filter regularly since a constant operating temperature significantly increases the service life of the power amp's electronic components. To this end, remove the two screws on the front grille of the VX power amp and then the grille itself. If you intend to use your power amp under relatively extreme conditions, it can be an advantage to remove the filter to maximize the cooling effect for the power amp. However, if you remove the filter, the ventilation ducts in the interior of the power amp must be cleaned regularly by a qualified service technician. 2. 2. 3 Direct Current If an internal defect causes direct current to be routed to the output of the VX power amp, it is diverted from the outputs via a thyristor circuit. This prevents a dangerous DC signal from reaching t 2. 3 Rack Mounting When mounting VX power amps to 19" transport racks, be sure to not only fasten the power amps to the case via the front brackets, but also attach the rear supporting brackets. Fastening the front brackets alone may hold the amp in place temporarily, but not permanently. The front rack brackets cannot bear the weight and stresses alone; you need the additional stabilization at the back. If you don't, knocks or vibrations sustained during transport may lead to power amp chassis damage. 3 Front Panel 3. 1 Master Switch This switch features an integrated automatic circuit breaker that shuts the power amp off should it be overloaded. After normal operating conditions are restored, you don't have to replace any secondary fuses in the device, simply reactivate the main power switch. When the amp is powered up, its operational status is indicated by the green ON LED. Note: When you are setting up a sound system, the power amps should be the last devices that you power up. In other words, don't switch them on until all other devices are on. When you shut a system down, always switch off the power amps first and then all the other devices in the signal chain. 3. 3 Input Level These control features are used to determine the amp's input sensitivity. The dB increments on the knob indicate by how many decibels the maximum output of the power amp is reduced. 3. 4 Protect LED This LED can indicate different defects in the operation of the power amp, depending on how it illuminates. Check the connections and ventilation or provide external ventilation. Once the power amp has cooled back down to normal operating temperature, the power amp will automatically switch itself back on. If, after cooling back down, the power amp does not switch back on to normal operating status, this indicates that there is some type of internal defect. In this case, a qualified service engineer should English VX Manual 1. 2 check the power amp. If the Protect LED flashes at three-second intervals, there is some kind of fault in the connected load, i. e. either the impedance of the connected loudspeaker system is too low for the power amp or an output is short-circuited. Also check the connected speaker system and the speaker cords for faults. After you've eliminated the source of the problem, it will resume operation automatically. 3. 5 Clip LED's These LED's illuminate to indicate that the amp has run out of headroom and has exceeded its performance threshold. [. . . ] La modification de l'impédance peut uniquement intervenir après mise hors tension de l'étage de puissance. 5 Caractéristiques techniques Classification: Etage de puissance à convertisseur continu-continu avec limiteurs. Sauf spécification contraire, les présentes données valent pour tous les modèles. Toutes les indications de niveaux se réfèrent à 0 dBV (1 V RMS). Entrées A, B Input Douilles: XLR (1 = terre; 2 = +; 3 = --) et jack stéréo (pointe = +; anneau = --; tige = terre) Conception: Douilles jack et XLR parallèles, équilibrées électroniquement Impédance d'entrée: 20 kohms symétrique, 10 kohms asymétrique (22 / 12 kohms pour le VX 800) Sorties Canal A, B Sorties disponibles chacune en Speakon® NL4 et serre-câbles. [. . . ]