Friday, October 25, 2013

NAD C-320 - POWER AMP SCHEMATIC (Circuit Diagram) - STEREO AMPLIFIER - [2SC5200 _ 2SA1943 – UPC1237]


POWER AMP & P/S _ SCHEMATIC


CLICK ON THE PICTURES TO ZOOM IN
ALIGNMENT PROCEDURES
INITIAL ADJUSTMENT (No load connected) {A. OUTPUT OFFSET VOLT AGE}
  • Connect a DC Millivoltmeter to L Channel speaker output terminals.
  • Turn unit ON and adjust VR21 (100 ohms) to get the reading of 0V+/-30mV.
  • Connect the DC Millivoltmeter to R Channel speaker output terminals and adjust VR11 (100ohms) to get a reading of 0V+/-30mV.
IDLING CURRENT
  • Connect a DC Millivoltmeter to TP1 and TP2 and adjust VR22 (300 ohms) for 3-5mV reading on meter.
  • Connect the DC Millivoltmeter to TP3 and TP4 and adjust VR12 (300 ohms) for 3-5mV reading on meter.
  • Leave power on for a minimum of 5 minutes.
Repeat procedure A and B for offset voltage and idling current alignment respectively.