Yamaha YST-SW320 Manuel d'utilisateur télécharger pdf (Page 6)

YST-SW320

■ ADJUSTMENTS

● Idling Adjustment

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.

Point A (Cathode of D29)

V : 20V/div H : 2 msec/div

DC range 1 : 1 probe

Point B (Anode of D30)

V : 20V/div H : 2 msec/div

DC range 1 : 1 probe

●

Confirmation of Power Amp operation

For the power amplifier which has been repaired, it

is absolutely necessary to confirm that a correct

waveform is obtained at points indicated by A and B

in the schematic diagram according to the following

procedure.

Devices required

Signal generator

8Ω or 6Ω load resistor

Oscilloscope (dual trace type)

Connection

1) Connect the output signal from the signal generator

to the input terminal of YST-SW320.

2) Disconnect the connector terminal connected to the

speaker unit and reconnect it to the load resistor.

3) Connect the HOT side of the oscilloscope CH1 probe

to the point A or B indicated in the figure and the

GND side to the GND of the main unit.

4) Connect the oscilloscope CH2 input to the red side

of the connector cable, which is connected with the

load resistor.

At this time, the GND terminal of CH2 must be left

unconnected.

Setting

1) Set the signal generator to the sine wave, 100Hz and

minimum output level settings.

2) Set the volume of YST-SW320 to the minimum

position.

3) Turn on the power to YST-SW320.

4) Adjust the output level of the signal generator and the

volume of YST-SW320 so that the output level

observed at oscilloscope CH2 is 28Vp-p.

Waveform observation

With the settings made as described above, observe

the waveform obtained at CH1 for judgment.

Normal Normal

Abnormal

+B or GND level

Becomes constant

Abnormal

-B or GND level

Becomes constant

● Confirmation of AUTO STANDBY

Measuring Condition

R60 = 1MΩ

➔1MΩ//10kΩ

F = 100Hz

Input Level = 4mV

Load = Open

Rating

After 2 to 8 sec.

STANDBY

(LED become red)

Don't STANDBY

Remarks

VOLUME: MAX

HIGH CUT: MAX

AUTO STANDBY: LOW

VOLUME: MAX

HIGH CUT: MAX

AUTO STANDBY: HIGH

1 2 3 4 5 6 7 8 9 10 11 ... 22 23

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Yamaha YST-SW320 Manuel d'utilisateur Page 6

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