Sharp 1-BIT AMPLIFIER SM-SX1 Service Manual page 9

AC/DC switching power supply, Output voltage adjustment
+22V Side
G
A
-22V Side
+22V Side
1-bit PWB adjusting method
Connect as shown Fig. 9-2.
AC IN 110-120, 220-240, 230V
AC POWER SUPPLY
UNIT
Figure 9-2
[Simplified offset voltage adjustment]
1. It is fitted to the mechanical center of VRA1, VRA2, VRA3, and VRA4.(FIg. 10-1)
2. Connect the digital multimeter to the terminals of the speaker, and adjust the voltage between + and – of each terminal to 0 ±
10 mVolt with VRA1 (L-ch) or VRA2 (R-ch). (Fig.9-3)
+
(OPTICAL)
DIGITAL OUT
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Output
Connector
semifixed VOL
From Main PWB
Figure 9-1
Digital Multimeter
-
-
RIGHT
RATED IMPEDANCE : 8
SPEAKERS
R-ch 8Ω SP Terminal L-ch
Figure 9-3
-22V Side
Check that the AC/DC output voltage is ±22V ±0.15V at the
connector. (If different, adjust the voltage using the semifixed
A
VOL as described above.)
+
LEFT
– 9 –
SM-SX1/SX1W
Output
Connector
semifixed VOL