Confirmation Of Idling Current Of Amp Unit - Yamaha NS-BP300 Service Manual

R-840/NS-BP300

■ CONFIRMATION OF IDLING CURRENT OF AMP UNIT

1) No signal applied.
2) Non-loaded condition.
3) Aging is not necessary.
Item Test Point
MAIN L: R578 CB504 1 – 2 pin
MAIN R: R579 CB504 3 – 4 pin
* Confirm that the idling current is 0.2 mV – 15 mV after 60 minutes.
SCHEMATIC DIAGRAM
38
Rating (DC)
If the measured voltage exceeds 2.6 mV, cut the lead wire of R562 (L ch) or
0.05mV – 2.5mV
R563 (R ch) and then check again if each measured value satisfies the rating.
Q513
R562 (cut off)
R563 (cut off)
Q514
Note
0.05 mV to 2.5 mV (DC)
R578 (L ch)
R579 (R ch)
MAIN (1)
R578 (L ch)
Test point
MAIN L:
0.05 mV to 2.5 mV (DC)
CB504
MAIN R:
0.05 mV to 2.5 mV (DC)
R579 (R ch)
R562 (L ch)
R563 (R ch)
Cut OFF