JVC RX-807VTN

RX-807VTN |
Power
Amplifier
Adjustment
Procedures
@ Idling Current
(1)
(2)
(3)
(4)
(5)
(6)
Turn
VR701(Main
L)
,VR702(Main
R)
and
RO42(Centre)
fully
counterclockwise
before
the
power
switch
on.
Warm up at least 10 minutes before adjustment.
Must keep the heatsink to prevent overheating before adjustment.
Set the volume contro! to minimum during this adjustment.
Connect
a
DC
voltmeter
to
R773
rasistor’s
leads
for
left
channel,
to
R774
for
right
channel
or
to
R028
for
centre
channel.
Adjust
VR701
for
left
channel,
VR702
for
right
channel
or
RO42
for
centre
channel
so
that
the
DC
voltmeter
becomes
2mV
~
7mV
H Confirm the waveforms for surround effects
Dolby
(1)
(2)
(3)
(4)
(5)
Provide a sine wave signal 40 Hz, 500 mVp-p to the left channel of CD input terminal.
Connect
X-axis
of
oscilloscope
to
the
input
signal
and
Y-axis
to
the
left
channel
terminal
of
rear
speaker
terminals.
Set the DELAY TIME to 1, 2,and 3.
Adjust
the
REAR
LEVEL
&
VOLUME
controls
to
500
mV
at
the
left
channel
of
rear
speaker
terminals.
Confirm
the
below
waveforms.
(Fig-1,
Fig-2,
Fig-3)
HALL : DELAY TIME - 1
(1)
(2)
(3)
(4)
(5)
1-22 (No. 20333)
Provide a sine wave signal 40 Hz, 500 mVp-p to the left channel of CD input terminal.
Connect
X-axis
of
oscilloscope
to
the input
signal
and
Y-axis
to
the
left
channel
terminal
of
rear
speaker
terminals
.
Set the DELAY TIME to 1.
Adjust
the
REAR
LEVEL
&
VOLUME
controls
to
500
mV
at
the
left
channel
of
rear
speaker
terminals.
Confirm
the
below
waveform.
(Fig
-1)
Fig-1
(Delay
1)
Fig-3
(Delay
2)
Fig-3
(Delay
3)