User manual ELECTRO-VOICE CARDYNE II DATASHEET

[. . . ] Security regulations as stated in the EN 60065 (VDE 0860 / IEC 65) and the CSA E65 - 94 have to be obeyed when servicing the appliance. Use of a mains separator transformer is mandatory during maintenance while the appliance is opened, needs to be operated and is connected to the mains 3. Switch off the power before retrofitting any extensions, changing the mains voltage or the output voltage. The minimum distance between parts carrying mains voltage and any accessible metal piece (metal enclosure), respectively between the mains poles has to be 3 mm and needs to be minded at all times. [. . . ] Any work security regulations that are applicable at the location where the appliance is being serviced have to be strictly obeyed. This applies also to any regulations about the work place itself. All instructions concerning the handling of MOS - circuits have to be observed. Note: SAFETY COMPONENT (HAS TO BE REPLACED WITH ORIGINAL PART ONLY) 8 DESCRIPTION DESCRIPTION First of all, we would like to express our thanks and at the same time congratulate you on the decision to buy one of our CONTRACTOR PRECISION SERIES power amplifiers. ElectroVoice CONTRACTOR PRECISION SERIES amplifiers are made to meet the highest requirements of any CONTRACTOR application. Thus they provide on-board protection against thermal and capacitive overload, short-circuit and the occurrence of HF or DC at the output. Additionally, special circuitry prevents the output-stage transistors from being damaged by Back-EMF. During soft start, delayed switching of the power outputs is accomplished via relays and a limiter controls the initial current inrush, preventing the mains fuse from being blown during the power-on operation. The mechanical construction as well is carried out following the highest precision standards of the industry. Thermal stability is guaranteed by two 3-Mode silently running fans. The extensive comparator circuitry constantly monitors the input and output signals and activates the internal limiters whenever a non-linear operational state is encountered. This provides reliable protection of the connected loudspeaker systems against overload and clipping. The cause that let the amplifier enter the protection mode ­ e. a short-circuited speaker cable ­ has to be eliminated. In case of thermal overload you have to wait until the power amplifier returns into normal operation mode. 5. POWER Switch Using the POWER switch you turn the amplifiers power on. To eliminate unwanted noise and knacks in the connected speaker systems, loudspeaker output switching is performed delayed via relays. An initial current inrush limiter prevents the mains fuse from being blown during power-on. 10 REAR PANEL POWER AMPLIFIER INPUTS "PHOENIX"-type connectors are provided parallel to the XLR-type inputs, offering the opportunity to feed additional power amplifiers with identical signals. The inputs are electronically balanced with pin-assignment according to the IEC 268 standard. Pin-assignment of the XLR-type input connectors: PIN 1: PIN 2: PIN 3: SHIELD a, + b, - Pin-assignment of the "PHOENIX"type connectors: Input sensitivity is factory set to 1Vrms. LEVEL CONTROLS dB-scaled potentiometers for the adjustment of the power amplifier's overall amplification. These controls should be set between 0 dB and ­6 dB, depending on the output of the connected signal source device ­ e. The printed scale shows the actual amount of damping in the amplification of the power amplifier. INPUT ROUTING PARALLEL MONAURAL Setting the selector switch to the PARALLEL/MONO position puts the channel A and channel B inputs in electrically direct parallel configuration, leaving you with the opportunity to individually control the channels' level settings by the use of the output controls A and B. DUAL STEREO When the selector switch is set to its DUAL/STEREO position both channels are amplified separately. 11 REAR PANEL POWER AMPLIFIER OUTPUTS The power amplifier's channel A (left) and channel B (right) outputs are carried out on 4-POLE-BARRIER-STRIP connectors. [. . . ] The signal gets internally inverted and fed to the channel B power amp. The two amplifiers A+B are now used in pushpull operation providing the double output voltage at the BRIDGED-OUT connector. The regular output voltages of the power amplifiers A and B are still present at the individual output connectors CHANNEL A and CHANNEL B but, in respect to the inverted phase, using these signals is not recommendable. Bridged mode operation with loads of 2 ohms is not admissible. GROUND-LIFT SWITCH The ground-lift switch is meant to help you in avoiding ground noise loops. [. . . ]