Confirmation Of Idling Current; Position For Checking Main (1) P.c.b; Amp Check / Display Data - Yamaha RX-V750 Service Manual

AMP CHECK

CONFIRMATION OF IDLING CURRENT

1. Immediately after the power is turned on, measure the
voltage across resistor terminals in the column "A" in
the table below and confirm that the measured value is
between 0.1mV and 10.0mV.
2. If the measured voltage exceeds 10.0mV, open (cutoff)
the resistor in the column "B" in the table below and re-
confirm the voltage.
Attention:
If the idling current exceeds 10.0mV after a power ampli-
fier repair, check for a defective component before cut-
ting the resistor.
3. Confirm that the voltage is between 0.2mV and 15.0mV
after 60 minutes.
0.1mV ~ 10.0mV
(DC)
R45 (FRONT L ch)
R46 (FRONT R ch)
R50 (CENTER)
<Position for Checking MAIN (1) P.C.B.>
P.C.B. A
MAIN (1) P.C.B. R45
R46
R50
R47
R48
R49
POWER (1) P.C.B. R398
0.1mV ~ 10.0mV
(DC)
R47 (SURROUND L ch)
R48 (SURROUND R ch)
R49 (SURROUND BACK R ch)
R398 (SURROUND BACK L ch)
RX-V750/DSP-AX750/DSP-AX750SE
CHANNEL B
FRONT L ch R38
FRONT R ch R39
CENTER R37
SURROUND L ch R34
SURROUND R ch R35
SURROUND BACK R ch R36
SURROUND BACK L ch R395
RX-V650/HTR-5760
Cut off
R38 (FRONT L ch)
R39 (FRONT R ch)
R37 (CENTER)
R34 (SURROUND L ch)
R35 (SURROUND R ch)
R36 (SURROUND BACK R ch)
R395 (SURROUND BACK L ch)
47