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MAIN
AMPLIFIER
ADJUSTMENT
IMPORTANT
NOTES:
1) Before
adjusting,
remove
input
signal
and
load,
and
set
Speaker
impedance
switch
to
8 ohms
(reset
to
4 ohms
when
finished).
2)
These
adjustments
are
always
necessary
after
repair
to
main
amplifier.
3) After
repair,
it
is recommended
to use
current
limiter
(70-100W
lightbulb)
in
mains
line,
for
initial
turn-on.
A.
CENTER
VOLTAGE
CHECK
1. Connect
DMM
between
Ground
and
R-471
(L channel) (R-472,
R
channel)(amplifier
output).
2.
Turn
on,
and
read
voltage.
Specification
OV
+
100mVDC.
B.
IDLE
CURRENT
ADJUSTMENT
1.
Connect
DMM
across
P-402(+)
and
P-403(-),
and
adjust
R-437
for
reading
of
15mV
+ 2.5mVDC.
2.
Repeat,
using
P-404(+)
and
P-405(-),
adjust
R-438.
C.
FINAL
ADJUSTMENT
1.
Leave
power
on
minimum
5 minutes.
2.
Repeat
center
voltage
check
and
idle
current
adjustments.
PREAMPLIFIER
ADJUSTMENT
A.
CHANNEL
BALANCE
1.
Feed
1kHz,
100mV
to
CD
input;
connect
AC
VTVM's
to
preamp
output.
PREAMPLIFIER
ADJUSTMENT
POINTS
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