Ao Y; Amp Adjustment - Yamaha DSP-A5 Service Manual

DSP-A5
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3 7 63 1515 0
I 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 0.1mV and 10.0mV.
•
If it exceeds 10.0mV, open (cut off) R571 (Main Lch), R577 (Main
Rch), R583 (Center), R589 (Rear Lch), R595 (Rear Rch) and
reconfirm the voltage.
•
Confirm that the voltage is 0.20mV ~ 15.0mV after 60 minutes.
R692
TE
L 13942296513
R696
MAIN (1)
R694
R577
R690
R571
R688
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Front Panel
19
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R583
Q523
R595
Q525
R589
Q524
Q522
Q521
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POWER (3)
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2 9
8
R688(Lch)
R690(Rch)
R692(Cch)
Q Q
3 6 7 1 3 1 5
R694(RLch)
R696(RRch)
R571(Lch)
R577(Rch)
R583(Cch)
R589(RLch)
R595(RRch)
Note)
•
If R571, R577, R583, R589 and
R595 have already been cut off
and idling current does not flow,
co
reconnect R571, R577, R583,
R589 and R595.
.
•
Q521 ~ Q525 are transistors for
temperature correction.
Apply silicone grease to contact
surface with the heat sink.
9 4 2 8
0.1mV ~ 10.0mV
(DC)
0.1mV ~ 10.0mV
(DC)
0 5 8 2 9 9 4 2 8
Cut off
m
9 9
9 9