Active Sub Woofer - 250Watts - Yamaha YST-320 schematic, Idling current adjustment
Amplifier
Output . . . . . . . .250W/5
Frequency Response . . . 20 Hz to 160 Hz (-24 dB/oct.)
Power Supply
U,
C models . . . . . . . . . . . AC120V, 60 HzFrequency Response . . . 20 Hz to 160 Hz (-24 dB/oct.)
Power Supply
A model . . . . . . . . . . . . . . .AC240V, 50 Hz
B, G models . . . . . . . . . . . AC230V, 50 Hz
R, T models . . . . . . . . . . . AC110/120/220/240V, 50/60 Hz
Power Consumption . . . . 60W
Dimensions (W x H x D) . .340 x 432 x 370 mm (13-3/8" x 17" x 14-9/16")
Weight . . . . . . . . . . . . . . ..17 kg (37 lbs. 7 oz)
Finish
All model . . . . . . . . . . . . . .Black color
R, T, G models . . . . . . . . .Cherry color
Idling AdjustmentB, G models . . . . . . . . . . . AC230V, 50 Hz
R, T models . . . . . . . . . . . AC110/120/220/240V, 50/60 Hz
Power Consumption . . . . 60W
Dimensions (W x H x D) . .340 x 432 x 370 mm (13-3/8" x 17" x 14-9/16")
Weight . . . . . . . . . . . . . . ..17 kg (37 lbs. 7 oz)
Finish
All model . . . . . . . . . . . . . .Black color
R, T, G models . . . . . . . . .Cherry color
To stabilize operation of the amplifier, turn ON the power with no input signal and wait for 1 or 2 minutes in non loaded condition before the adjustment.
Adjust VR1 so that the voltage between terminals TP11 and TP12 is DC 50mV to 250mV.
Idling current adjustment points
Circuit diagram [Click on the pictures to magnify]
Power amplifier PWB
