Amp Adjustment; Confirmation Of Idling Current Of Main P. C. B - Yamaha RX-V459 Service Manual

RX-V459/HTR-5940/DSP-AX459
HTR-5935
I AMP ADJUSTMENT
Confirmation of Idling Current of MAIN (1) P. C. B.
• Right after power is turned on, confirm that each mea-
sured voltage across the terminals of R1149 (FRONT
Lch), R1150 (FRONT Rch), R1153 (CENTER), R1154
(SURROUND Lch), R1152 (SURROUND Rch), R1151
(SURROUND BACK) is between 0.1 mV and 10.0 mV.
• If it exceeds 10.0 mV, open (cutoff) R1104 (FRONT
Lch), R1106 (FRONT Rch), R1112 (CENTER), R1114
(SURROUND Lch), R1110 (SURROUND Rch), R1108
(SURROUND BACK) 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-15.0 mV. after 60
minutes.
38
0.1mV ~ 10.0mV
(DC)
R1149 (FRONT Lch)
R1150 (FRONT Rch)
R1153 (CENTER)
Cut off
R1104 (FRONT Lch)
R1106 (FRONT Rch)
R1112 (CENTER)
R1114 (SURROUND Lch)
R1110 (SURROUND Rch)
R1108 (SURROUND BACK Rch)
0.1mV ~ 10.0mV
(DC)
R1154 (SURROUND Lch)
R1152 (SURROUND Rch)
R1151 (SURROUND BACK Rch)