Circuit diagram - current adjustments - NAD C320BEE – Stereo amplifier - NAD C320BEE : Used semiconductors and ICs - 2SD669 – 2SC5200 – TL082D – Upc1237HA – Z86C0812PSC – 24C01 – 4094
CONTINUOUS
AVERAGE POWER 50 W (17 dBW)
OUTPUT INTO 8 OHMS OR 4 OHMS
IHF dynamic power (maximum short term power per channel)
8 ohms: 110 W (20.4 dBW)
4 ohms: 160 W (22.0 dBW)
2 ohms: 210 W (23.2 dBW
OUTPUT INTO 8 OHMS OR 4 OHMS
IHF dynamic power (maximum short term power per channel)
8 ohms: 110 W (20.4 dBW)
4 ohms: 160 W (22.0 dBW)
2 ohms: 210 W (23.2 dBW
Schematic [Click on the pictures to magnify]
ALIGNMENT PROCEDURES. INITIAL ADJUSTMENT (No load connected)
A. OUTPUT OFFSET VOLTAGE
1. Connect a DC Millivoltmeter to L Channel speaker output terminals.
2. Turn unit ON and adjust VR21 (100 ohms) to get the reading of 0V+/-30mV.
3. Connect the DC Millivoltmeter to R Channel speaker output terminals and adjust VR11 (100ohms) to get a reading of 0V+/-30mV.
B. IDLING CURRENT
1. Connect a DC Millivoltmeter to TP1 and TP2 and adjust VR12 (300 ohms) for 3-5mV reading on meter.
2. Connect the DC Millivoltmeter to TP3 and TP4 and adjust VR22 (300 ohms) for 3-5mV reading on meter.
3. Leave power on for a minimum of 5 minutes.
FINAL ADJUSTMENT
Repeat procedure A and B for offset voltage and idling current alignment respectively.
1. Connect a DC Millivoltmeter to L Channel speaker output terminals.
2. Turn unit ON and adjust VR21 (100 ohms) to get the reading of 0V+/-30mV.
3. Connect the DC Millivoltmeter to R Channel speaker output terminals and adjust VR11 (100ohms) to get a reading of 0V+/-30mV.
B. IDLING CURRENT
1. Connect a DC Millivoltmeter to TP1 and TP2 and adjust VR12 (300 ohms) for 3-5mV reading on meter.
2. Connect the DC Millivoltmeter to TP3 and TP4 and adjust VR22 (300 ohms) for 3-5mV reading on meter.
3. Leave power on for a minimum of 5 minutes.
FINAL ADJUSTMENT
Repeat procedure A and B for offset voltage and idling current alignment respectively.
