Yamaha DSP-A595a Panduan Servis - Halaman 20

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Halaman Cetak
DSP-A595a
QQ
3 7 63 1515 0

AMP ADJUSTMENT

Confirmation of Idling Current of Main Amplifier
•
Right after power is turned on, confirm that the voltage across the
terminals of R688(Main Lch),R690(Main Rch), R692(Center),
R694(Rear Lch), R696(Rear Rch) are between 0.1mVand 5.0mV.
•
If it exceeds 5.0mV, open (cut off) R571 (Main Lch), R577 (Main
Rch), R589 (Center), R595 (Rear Lch), R583 (Rear Rch) and
reconfirm the voltage again.
•
Confirm that the voltage is 0.25mV ~ 15.0mV after 60 minutes.
R692
R696
TE
L 13942296513
MAIN ( 1 )
R694
R690
R577
R688
www
R571
.
Front Panel
19
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R583
Q523
R595
Q525
R589
Q524
MAIN ( 7 )
Q522
Q521
x
ao
u163
y
i
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2 9
8
R688(Lch)
R690(Rch)
R692(Cch)
R694(RLch)
R696(RRch)
Q Q
3
6 7
1 3
1 5
R571(Lch)
R577(Rch)
R589(Cch)
R595(RLch)
R583(RRch)
Note)
•
If R571, R577, R589, R595 and
R583 have already been cut off
and idling current does not flow,
reconnect R571, R577, R589,
R595 and R583.
•
Q521 ~ Q525 are transistors for
temperature correction.
Apply silicone grease to contact
surface with the heat sink.
co
.
9 4
2 8
0.1mV ~ 5.0mV
(DC)
0 5
8
2 9
9 4
2 8
Cut off
m
9 9
9 9