Amp Adjustments - Yamaha CRX-E150 Service Manual

CRX-E150
QQ
3 7 63 1515 0

AMP ADJUSTMENTS

Confirmation of Idling Current
1) No signal applied.
2) Non-loaded condition.
3) Aging is not neccessary.
Item Test Point
R460
MAIN L
(Between terminal)
R461
MAIN R
(Between terminal)
* Confirm that the idling current is 0.25mV — 15mV after 60 minutes.
TE
L 13942296513
Q413
R461
Q412
R460
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Rating (DC)
If the measured voltage exceeds 5mV, cut the lead wire of R446 (L
ch) or R447 (R ch) and then check again if each measured value satisfies
0.1mV—5mV
the rating.
R447
R446
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0.1mV ~ 5mV (DC)
R460 (L ch)
R461 (R ch)
Q Q
3 6 7 1 3
Note)
•
If R446 (L ch) or R447 (R ch) have already been cut off and
idling current does not flow, reconnect R446 (680 ohms)
or R447 (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
R446 (L ch)
R447 (R ch)
Cut OFF
1 5 0 5 8 2 9 9 4
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co
9 9
2 8 9 9