Confirmation Of Idling Current Of Amp Unit - Yamaha RX-V861 Service Manual

RX-V861/HTR-6080/DSP-AX861SE/DSP-AX861
I CONFIRMATION OF IDLING CURRENT OF AMP UNIT
• Right after power is turned on, confirm that the voltage across
the terminals of R1303 (SURROUND BACK R ch), R1153
(SURROUND R ch), R1154 (FRONT R ch), R1152 (CEN-
TER), R1150 (FRONT L ch), R1151 (SURROUND L ch),
R1149 (SURROUND BACK L ch) are between 0.1 mV and
10.0 mV.
• If it exceeds 10.0 mV, open (cut off) R1252 (SURROUND
BACK R ch), R1112 (SURROUND R ch), R1114 (FRONT
R ch), R1110 (CENTER), R1106 (FRONT L ch), R1108
(SURROUND L ch), R1104 (SURROUND BACK L ch) and
reconfirm the voltage.
Attention
If the measured voltage exceeds 10.0 mV 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)
MAIN (1) P.C.B.
R1303
R1252
56
R1303 (SURROUND BACK Rch)
R1153 (SURROUND Rch)
R1154 (FRONT Rch)
R1152 (CENTER)
R1150 (FRONT Lch)
R1151 (SURROUND Lch)
R1149 (SURROUND BACK Lch)
R1154 R1153
R1114 R1112
Open (cut off)
R1252 (SURROUND BACK Rch)
R1112 (SURROUND Rch)
R1114 (FRONT Rch)
R1110 (CENTER)
R1106 (FRONT Lch)
R1108 (SURROUND Lch)
R1104 (SURROUND BACK Lch)
Rear
R1152 R1151
R1110 R1108
Front
R1150 R1149
R1106
R1104