SM-SX100
– 54 –
No
• 1-bit amplifying section check (power trouble/protector activation)
Yes
Don't the protector activate together with drop of voltage
±
32V if CNWAM4 and CNWAM3 are disconnected?
Recheck the main body section.
No
Does the oscillating circuit operate? Check Pin 9.
Replace ICA1.
Check CXA1 crystal and CA8, CA9.
Yes
Check ICA4 to ICA7, CA36 to CA39, QA9 to QA16 and
RA53 to RA60.
Figure 54-1
1
• OUTR(+), OUTR(-)
• OUTL(+), OUTL(-)
Observe
each pair.
OUTR(+),
(OUTL(+))
OUTR(-),
(OUTL(-))
3
Observe
each pair.
• QA1, QA5
• QA2, QA6
• QA3, QA7
• QA4, QA8
QA2
(QA1, 3, 4)
BASE
QA6
(QA5, 7, 8)
BASE
4
Observe
each pair.
• QA1, QA5
• QA2, QA6
• QA3, QA7
• QA4, QA8
QA2
(QA1, 3, 4)
EMITER
QA6
(QA5, 7, 8)
EMITER
5
Observe
each pair.
• QA1, QA5
• QA2, QA6
• QA3, QA7
• QA4, QA8
QA1
(QA2, 3, 4)
COLECTOR
QA5
(QA6, 7, 8)
COLECTOR
6
Observe Li and Hi of
ICA4 to 7 of each.
Li
Hi
7
Observe
each pair.
• QA9, QA11
• QA10, QA12
• QA13, QA15
• QA14, QA16
QA10
(QA9,13,14)
GATE
QA12
(QA11,15,16)
GATE
8
Observe SW section
of Lch and Rch of each.
Figure 54-2
Figure 54-3
Figure 54-4
Figure 54-5
Figure 54-6
Figure 54-7
* When protection is activated, even if the function is switched, switching is not possible. Moreover, the volume is not variable, and
the volume indicator does not change. It is released when the power switch is turned off.