Technics SU-A900DM2 - Measurements and Adjustment

SE-A900SM2 |
m
Measurements
and
Adjustments
Measuring
Instruments
and
Special
Tools
®
AG
electronic
voltmeter
(AC
EVM)
@
AF
oscillator
Power
Meter
Adjustment
oscar
ee
EVM
4.
Test
equipment
connection
is
shown
in
Fig.
1.
2.
Before
turning
ON
the
set,
adjust
VR909
(L-ch)
and
VR910
(R-ch)
to
mechanical
center
position
(shown
in
Fig.
2).
3.
Turn
the
power
ON,
make
sure
that
the
power
meter
Is
mechanically
adjusted
to
0
point
(shown
in
Fig.
3).
4.
Apply
a
1
kHz
signa!
to
the
input
terminal
so
that
the
output
voltage
of
Oo Go
speaker
terminal
is
8.94
V
(adjust
the
signal
level
with
the
attenuator
|
Fig.
1
of
AF
oscillator).
7
5.
Adjust
VR909
(L-ch)
and
VR910
(R-ch)
so
that
the
power
meter
indicates
10
W
(shown
in
Fig.
4).
0.001
6.01
0.
10
100
200
WwlWY
0 20 -10 Oo +
WAN WAL EE EEA SZ
Fig. 3
0.001
0.01
0.1
1
10
100
200
ANIA
50-40 “30 -20 : oO +5
WNW LEE A//4/7
Fig. 4
-~12-