SM-SX1 (serv.man2). (including circuit diagrams and s) - Sharp Audio Service Manual (repair manual). Page 33

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SM-SX1H
– 33 –
WAVEFORMS OF 1 BIT AMP. CIRCUIT
5
4
Observe 
each pair.
• QA1, QA5
• QA2, QA6
• QA3, QA7
• QA4, QA8
Observe 
each pair.
• QA1, QA5
• QA2, QA6
• QA3, QA7
• QA4, QA8
QA1
(QA2, 3, 4)
COLECTOR
QA5
(QA6, 7, 8)
COLECTOR
QA2
(QA1, 3, 4)
EMITER
QA6
(QA5, 7, 8)
EMITER
2
3
1
• OUTR(+), OUTR(-)
• OUTL(+), OUTL(-)
Observe 
each pair.
Observe 
each pair.
OUTR(+), 
(OUTL(+))
OUTR(-), 
(OUTL(-))
• RA5, RA7
• RA6, RA8
Observe 
each pair.
• QA1, QA5
• QA2, QA6
• QA3, QA7
• QA4, QA8
RA5
(RA6)
RA7
(RA8)
QA2
(QA1, 3, 4)
BASE
QA6
(QA5, 7, 8)
BASE
7
8
6
Observe Li and Hi of 
ICA4 to 7 of each.
Li
Hi
Observe SW section 
of Lch and Rch of each.
Observe 
each pair.
• QA9, QA11
• QA10, QA12
• QA13, QA15
• QA14, QA16
QA10
(QA9,13,14)
GATE
QA12
(QA11,15,16)
GATE
Set -22V at GND for observation of   
6
   to   
8
  .
Figure 33-1
Figure 33-2
Figure 33-3
Figure 33-4
Figure 33-5
Figure 33-6
Figure 33-7
Figure 33-8
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