Confirmation Of Idling Current Of Amp Unit; Amp Adjustment / Display Data - Yamaha RX-V3900 Service Manual

■ AMP ADJUSTMENT /

Confirmation of Idling Current of Amp Unit

● Right after power is turned on, confirm that the volt-
age across the terminals of R467 (SURROUND BACK
Rch), R468 (SURROUND Rch), R469 (FRONT Rch),
R470 (CENTER), R471 (FRONT Lch), R472 (SUR-
ROUND Lch), R473 (SURROUND BACK Lch) are be-
tween 0.1mV and 10.0mV.
● If it exceeds 10.0mV, open (cut off) R432 (SURROUND
BACK Rch), R433 (SURROUND Rch), R434 (FRONT
Rch), R435 (CENTER), R436 (FRONT Lch), R437
(SURROUND Lch), R438 (SURROUND BACK Lch)
and reconfirm the voltage.
Attention
If the measured voltage exceeds 10.0mV after an
amplifier repair, first check for a defective component
before cutting the bias resistor.
● Confirm that the voltage is 0.2 mV to 15.0 mV after 60
minutes.
0.1mV - 10.0mV
(DC)
R473
R472
R437
R438
R467 (SURROUND BACK Rch)
R468 (SURROUND Rch)
R469 (FRONT Rch)
R470 (CENTER)
R471 (FRONT Lch)
R472 (SURROUND Lch)
R473 (SURROUND BACK Lch)
FRONT side
R470
R471
R436
MAIN (1) P.C.B.
REAR side
CENTER FRONT Lch
Lch SURROUND BACK Lch
Rch CENTER
SURROUND Lch
Open (cut off)
R432 (SURROUND BACK Rch)
R433 (SURROUND Rch)
R434 (FRONT Rch)
R435 (CENTER)
R436 (FRONT Lch)
R437 (SURROUND Lch)
R438 (SURROUND BACK Lch)
R469
R435
R434
RX-V3900/DSP-AX3900
F R O N T R c h
SURROUND
FRONT
FRONT Lch
SURROUND BACK Lch
R467
R468
R433
R432
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