Adjustment - JVC AX-V8000 Service Manual

4.1 Adjustment of idling current
Lch B903
Rch B911
Cch B907
SLch B907
SRch B909
SBLch B901
SBRch B913
Attention:
This adjustment does not obtain a correct adjustment value immediately after the amplifier is used (state that an internal temperature
has risen).
Please adjust immediately after using the amplifier after turning off the power supply of the amplifier and falling an internal temper-
ature.
Adjustment method
(1) Prior to turning the power ON, fully turn the adjusting resistor (VR701, VR702, VR751, VR752, VR771, VR772, VR801) coun-
terclockwise direction and connect the DC voltmeter to the measuring terminal (B901-B902, B903-B904, B905-B906, B907-
B908, B909-B910, B911-B912, B913-B914).
(2) Adjust the resistor so that the measured value becomes 2.0mV just after the power supply is turned on.
(3) Adjust the resistor so that the measured value becomes 2.5mV more than 60 seconds after the power supply is turned on.
(4) After stability is 1.0-4.0mV.
Refer to following page "Idling Current graph".
NOTE:
It is not abnormal though the idling current might not become 0mA even if it is finished to turn variable resistance (VR701, VR702,
VR751, VR752, VR771, VR772, VR801) in the direction of counterclockwise.
VR701 (Lch)
VR801 (Cch)
VR771 (SLch)
VR751 (Rch)

ADJUSTMENT

Measuring point Alignment point
& B904 VR701
& B912 VR751
& B908 VR801
& B908 VR771
& B910 VR772
& B902 VR702
& B914 VR752
SECTION 4
No load and No signal.Rated line voltage
SURROUND : OFF
Room temperature : 20 to 25 ºC
Measuring condition
B901, B902 (SBLch)
B903, B904 (Lch)
VR702 (SBLch)
B905, B906 (SLch)
B907, B908 (Cch)
VR772 (SRch)
B909, B910 (SRch)
VR752 (SBRch)
B911, B912 (Rch)
B913, B914 (SBRch)
(No.MB177)1-17