SM-SX100 (serv.man2) - Sharp Audio Service Manual (repair manual). Page 10

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Connect as shown Fig. 10-1.
AC IN 110-120, 220-240, 230V

AC POWER SUPPLY

UNIT

Digital Multimeter

Oscilloscope

[Simplified offset voltage adjustment]
Connect the digital multimeter to the terminals of the speaker, and adjust the voltage between + and - of each terminal to 0 

±

 10mV.

(Fig. 10-2)
(Adjusi from 4 ohms)

Rch

4 ohms

VRA1

Rch

8 ohms

VRA3

Lch

4 ohms

VRA2

Lch

8 ohms

VRA4

4 ohms and 8 ohms 

SP terminal

Rch

Rch

Lch

Lch

Impedance 
Selector SW

(Parallel to SP terminal 
on the upper side)

(Terminal Board Diagram)

* On both Lch and Rch, adjust the 4 ohms side earlier.

[Adjustment Check]
Connect the oscilloscope to the test point, and verify that the following voltage is not generated. (Fig. 10-3)

5.0

}

1.0Vp-p

Check both L and R.

Lch T.P

Rch T.P

(VRA2)

(VRA4)

(VRA3)

(VRA1)

(1 BIT AMP. PWB)