Yamaha R-S700, Service Manual

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32
R-S700
R-S70
0
C u t off
R139 (L ch)
R142 (R ch)
R156
R159
R157
R158
R139
R142
R159
R157
MAIN (1) P.C.B.
R156
R158
0.1mV–10mV
(L ch)
0.1mV–10mV
(R ch)
■
AMP ADJUSTMENT
●
CONFIRMATION OF IDLING CURRENT
1. Right after power is turned on, confirm that the voltage across the terminals of R156–R159 (L ch) and R157–R158 (R
ch) are between 0.1 mV and 10 mV.
2. If measured voltage exceeds 10 mV, open (cut off) R139 (L ch), R142 (R ch) and reconfirm the voltage.
Attention
If the measured voltage exceeds 10 mV after repairing the power amplifier, check other parts again for any
possible defect before cutting the resistor.
3. Confirm that the voltage is between 0.2 mV and 15 mV after 60 minutes.