User manual FURMAN AR20 II

[. . . ] When left unused for a long period of time, the power cord of the AR-20 II should be unplugged from the outlet. The AR-20 II should be serviced by qualified service personnel when: a. the AR-20 ii does not appear to operate normally or exhibits a marked change in performance. The AR-20 II requires that a safety ground be present for proper operation. [. . . ] the Series II SMP+ circuit senses voltages that are so high that operation would be impossible and shuts the power down before damage can occur. Upon initially applying power to these units, the Extreme Voltage indicator LED will light if the input voltage is above the extreme voltage cutoff, and power will not be applied to the unit's outlets. If the unit has been operating with an acceptable input voltage and subsequently that voltage exceeds 1453 Fuses and cIRcuIt BReaKeRs there is one fuse and one circuit breaker in the AR-series. in the event that the unit appears to be completely dead (neither the Power switch nor any LED's light up), unplug the power cord and the load and check the breaker. A fast-blow 20 amp circuit breaker is accessible at the rear panel without removing the unit from the rack. This breaker will trip if the aR-20 II Voltage RegulatoR / poweR condItIoneR unit's 20 amp capacity is exceeded at any time. This fuse will blow if the unit has been connected to a voltage that is above the range of the extreme Voltage shutdown circuitry. To replace it, the unit must be completely disconnected from all power and removed from its rack. the six hex head screws and two Phillips head screws holding the top cover must be removed. the internal fuse is located in a holder on the printed circuit board. Replace the fuse only with the exact same type (1/4 fast blow). InstallatIon Because of their toroidal transformer design, Furman Voltage Regulators may be positioned near most other equipment without fear that the other equipment will be disrupted by leakage of a strong 50/60 Hz magnetic field. Nevertheless, suggested rack locations would be either at the top or bottom. As with any rackmount equipment, be sure to use 10-32 machine screws for mounting in the rack's tapped holes (this is not a metric size). In particular, beware of 10-24 screws, which may fit if forced but which will strip the threads. To avoid marring the front panel finish, use plastic washers under the screw heads. Input Voltage & cuRRent monItoRIng the digital meter at the left of the front panel make up a meter that indicates input VoLtAGE or CURRENT levels. A switch to the left of the meter allows the user to switch between these two readings. It is important to remember that this is the voltage or current coming from the wall before it has been regulated. This is not the level of voltage going into the equipment you have connected to the AR-20 ii. desIgn the AR-series uses a design based on an eight-tap toroidal autoformer. the toroidal design assures minimal leakage of stray magnetic fields, and, because of its high efficiency, a very compact size for its rating. the Voltage Regulator's circuitry monitors the incoming line voltage with each cycle, comparing it to an extremely precise voltage reference, accurate to ±0. 15%. If a voltage fluctuation requires that a different tap be selected, the new tap is electronically switched exactly at the zero-crossing, to avoid distorting the AC waveform. Most commercial voltage regulators using multipletapped transformers switch taps at uncontrolled times, thereby creating voltage spikes and clicks that can leak into the audio! [. . . ] Manufacturer's employees or representatives' ORAL OR OTHER WRITTEN STATEMENTS DO NOT CONSTITUTE WARRANTIES, shall not be relied upon by Purchaser, and are not a part of the contract for sale or this limited warranty. This Limited warranty states the entire obligation of Manufacturer with respect to the Product. If any part of this Limited warranty is determined to be void or illegal, the remainder shall remain in full force and effect. 6 seRVIce Before returning any equipment for repair, please be sure that it is adequately packed and cushioned against damage in shipment, and that it is insured. we suggest that you save the original packaging and use it to ship the product for servicing. [. . . ]