Confirmation Of Idling Current Of Amp Unit - Yamaha RX-V671 Service Manual

RX-V671/HTR-6064/RX-A710

■ CONFIRMATION OF IDLING CURRENT OF AMP UNIT

● Right after power is turned on, confirm that the voltage across the terminals of R1152 (SURROUND BACK Rch), R1154
(SURROUND Rch), R1150 (FRONT Rch), R1148 (CENTER), R1149 (FRONT Lch), R1153 (SURROUND Lch), R1151
(SURROUND BACK Lch) are between 0.1 mV and 10.0 mV.
● If it exceeds 10.0 mV, open (cut off) R1090 (SURROUND BACK Rch), R1092 (SURROUND Rch), R1088 (FRONT Rch),
R1086 (CENTER), R1087 (FRONT Lch), R1091 (SURROUND Lch), R1089 (SURROUND BACK Lch) and reconfirm the
voltage.
Attention
If the measured voltage exceeds 10.0 mV 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.
0.1 mV – 10.0 mV
(DC)
R1154
MAIN (1) P.C.B.
68
R1152 (SURROUND BACK Rch)
R1154 (SURROUND Rch)
R1150 (FRONT Rch)
R1148 (CENTER)
R1149 (FRONT Lch)
R1153 (SURROUND Lch)
R1151 (SURROUND BACK Lch)
R1153 R1152 R1151
R1092 R1091 R1090
Open (cut off)
Front side
R1150 R1149
R1089 R1088 R1087
R1090 (SURROUND BACK Rch)
R1092 (SURROUND Rch)
R1088 (FRONT Rch)
R1086 (CENTER)
R1087 (FRONT Lch)
R1091 (SURROUND Lch)
R1089 (SURROUND BACK Lch)
R1148
R1086