Power Amplifier Adjustment - Yamaha RX-V681 Service Manual

RX-V681/RX-A760

■ POWER AMPLIFIER ADJUSTMENT

1. Right after power is turned on, confirm that the voltage across the terminals of R1152 (CENTER), R1154 (SURROUND
Rch), R1150 (FRONT Lch), R1148 (SURROUND BACK Lch), R1149 (SURROUND BACK Rch), R1153 (SURROUND
Lch) and R1151 (FRONT Rch) are within the confines of 0.1 mV to 10 mV.
2. If measured voltage exceeds 10 mV, remove R1104 (CENTER), R1106 (SURROUND Rch), R1102 (FRONT Lch),
R1100 (SURROUND BACK Lch), R1101 (SURROUND BACK Rch), R1105 (SURROUND Lch) and R1103 (FRONT
Rch), and then reconfirm the voltage.
Attention
If the measured voltage exceeds 10 mV after repairing the power amplifier, check other parts again for any possible
defect before removing the resistor.
3. Confirm that the voltage is within the confines of 0.2 mV to 15 mV after 60 minutes.
0.1 mV – 10 mV
(DC)
SURROUND R
R1154
MAIN (1) P.C.B.
(Side A)
SURROUND
BACK L
R1100
MAIN (1) P.C.B.
(Side B)
72
R1152 (CENTER)
R1154 (SURROUND Rch)
R1150 (FRONT Lch)
R1148 (SURROUND BACK Lch)
R1149 (SURROUND BACK Rch)
R1153 (SURROUND Lch)
R1151 (FRONT Rch)
Front side
SURROUND L CENTER
R1153 R1152
Front side
SURROUND
FRONT L
BACK R
R1101
R1102
FRONT R FRONT L
R1151 R1150
FRONT R CENTER
R1103 R1104
R1104 (CENTER)
R1106 (SURROUND Rch)
R1102 (FRONT Lch)
R1100 (SURROUND BACK Lch)
R1101 (SURROUND BACK Rch)
R1105 (SURROUND Lch)
R1103 (FRONT Rch)
SURROUND SURROUND
BACK R BACK L
R1149 R1148
SURROUND L SURROUND R
R1106
R1105