Confirmation Of Idling Current; Amp Adjustments 26~27 - Yamaha CRX-E300 Service Manual

CRX-E300
QQ
3 7 63 1515 0
I AMP ADJUSTMENTS
G

Confirmation of Idling Current

1) No signal applied.
2) Non-loaded condition.
3) Aging is not neccessary.
Item Test Point
R471
MAIN L
(Between terminal)
R474
MAIN R
(Between terminal)
* Confirm that the idling current is 0.25mV — 15mV after 60 minutes.
TE
L 13942296513
Q413
Q412
R440
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26
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Rating (DC)
If the measured voltage exceeds 5mV, cut the lead wire of R440 (L
ch) or R445 (R ch) and then check again if each measured value satisfies
0.1mV—5mV
the rating.
R474
R445
R471
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8
0.1mV ~ 5mV (DC)
R471 (L ch)
R474 (R ch)
Q Q
3 6 7 1 3
Note)
•
If R440 (L ch) or R445 (R ch) have already been cut off and
idling current does not flow, reconnect R440 (680 ohms)
or R445 (680 ohms).
•
Q412 and Q413 are transistors for temperature correction.
Apply silicone grease to the contact surface with the heat
sink.
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2 9 9 4 2 8
Note
R440 (L ch)
R445 (R ch)
Cut OFF
1 5 0 5 8 2 9 9 4
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co
9 9
2 8 9 9