SERVICE MANUAL - Nexo

NXAMP4x4■ INSPECTIONS1. Measurement Conditions1-1. Environment• Normal temperature: From 10 ˚C to 35 ˚C• Normal humidity: From 45 % to 85 %1-2. Power Source• When measuring the electrical characteristics, set the power supply voltage and frequency as specified in the tablebelow.Destination Power supply voltage FrequencyU 120 V +2/-0 % 60 HzCHN 230 V +2/-0 % 50 Hz1-3. Measuring Instruments• Use a reliable measuring device capable of precisely measuring the specification values indicated in this document.• Input impedance of the measuring instrument should be more than 1 MΩ.• The noise level should be measured with a 22 Hz-22 kHz band pass filter.When you use the Audio Analyzer System made by Audio Precision, Inc. for noise measurement, set the filtercharacteristics as follows.BW : 22 Hz-22 kHzFilter (Fltr) : None1-4. ConnectionsEach input and output terminal of channels 1-4 are as shown in the figure below.Ch4OUTCh3OUTCh2OUTCh1OUTCh4INCh3INCh2INCh1INCh4LINKOUTCh3LINKOUTCh2LINKOUTCh1LINKOUTFig. 1781-4-1. Input connectorXLR-3-31 (female) type connectors are used for input terminals in channels 1-4.Condition : Balanced inputWiring : pin 1 to ground, pin 2 to hot (+), pin 3 to cold (-)1-4-2. Output connectorNeutrik SPEAKON connectors are used for output terminals in channels 1-4.Connect a load resistor between pin 1+ and pin 1- of the Neutrik SPEAKON connector.1-4-3. Load resistorUse a load resistor with no inductivity and a power rating high enough to perform each test safely.1-4-4. Link out connectorsXLR-3-32 (male) type connectors are used for input terminals in channels 1-4.Condition : Balanced outputWiring : pin 1 to ground, pin 2 to hot (+), pin 3 to cold (-)