Amp Adjustment; Confirmation Of Idling Current Of Amp Unit - Yamaha RX-V1800 Service Manual

I AMP ADJUSTMENT

Confirmation of Idling Current of Amp Unit

• Right after power is turned on, confirm that the voltage
across the terminals of R ( ),
R468 ( ), R469 (FRONT Rch), R470
(CENTER), R471 (FRONT Lch), R472 (SURROUND
Lch), R473 (SURROUND BACK Lch) are between
0.1mV and 10.0mV.
• If it exceeds 10.0mV, open (cut off) R432 (
), R433 ( ), 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 am-
plifier repair, first check for a defective component be-
fore cutting the bias resistor.
• Confirm that the voltage is 0.2 mV to 15.0 mV after 60
minutes.
0.1mV - 10.0mV
(DC)
R467 (SURROUND BACK Rch)
R468 (SURROUND Rch)
R469 (FRONT Rch)
R470 (CENTER)
R471 (FRONT Lch)
R472 (SURROUND Lch)
R473 (SURROUND BACK Lch)
FRONT Rch
CENTER FRONT Lch SURROUND
Lch SURROUND BACK Lch
FRONT
Rch CENTER FRONT Lch
SURROUND Lch SURROUND BACK 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)
FRONT
R473 R470
R471
R472
R436
R437
R438
MAIN (1) P.C.B.
REAR
RX-V1800/HTR-6190/DSP-AX1800
R467
R469 R468
R435
R434 R433
R432
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