Yamaha NS-BP300 Service Manual page 39

Test point
MAIN R:
0.05 mV to 2.5 mV (DC)
MAIN L:
0.05 mV to 2.5 mV (DC)
Notes)
• If the measured voltage exceeds 2.6 mV after an amplifier repair, first check for a defective component before cutting
the bias resistor.
• If R562 (L ch) or R563 (R ch) have already been cut off and idling current does not flow, reconnect R562 (1 k-ohms) or
R563 (1 k-ohms).
• Q513 and Q514 are transistors for temperature correction. Apply silicone grease to the contact surface with the
heatsink.
CB504
R578 (L ch)
Q513
R562 (cut off)
R579 (R ch)
Q514
R563 (cut off)
R-840/NS-BP300
MAIN (1) P.C.B.
Front side
Rear side
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