Yamaha MFC2 Manuel de service télécharger pdf (Page 7)

YST-SW800

Check the operation and make adjustment as follows.

a. Connect CB205.

b. Connect the probe of the oscilloscope between TP201

and TP202.

c. Turn on the power switch and the STANDBY/ON switch

on the front panel.

d. Check the waveform on the oscilloscope and adjust

VR201 so that a = b is obtained.

Permissible range: a/b = 1.0 ± 0.1

CAUTION

Electric potential is always applied to the ground side of the oscilloscope.

Be careful so that no other part comes in contact with it.

Caution for operation check of the SW power supply section and the power amplifier

As a high voltage is applied to the SW power supply section and the power amplifier, be careful not

to receive an electric shock.

V : 50V/div H : 10 µsec/div

AC range 1 : 1 probe

280Vp-p

Power (1) P.C.B

Q18 Q16 Q22 Q24

Q39

Q25 Q23 Q17 Q19

– B

GND

+ B

Main (1) P.C.B

Main (2) P.C.B

1 2 3 4 5 6 7 8 9 10 11 12 ... 25 26

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Yamaha MFC2 Manuel de service Page 7