Marantz 3800 - Page 22

(1)
(2)
(3)
(4)
(6)
(7)
(1)
(2)
TONE CONTROL (Figure 2-5)
Connect oscillator to AUX INPUT Jack.
Depress AUX Switch. TONE DEFEAT
Switch should be in. Connect AC VTVM
to PREAMP OUTPUT Jack.
With VOLUME Control set to maximum,
set oscillator output level ‘for O dB, 1 V
rms indication on VTVM at 1 kHz.
Press and release TONE DEFEAT and
center TONE Controls. Output should
remain O dB.
Sweep from 20 Hz to 20 kHz. Frequency
response should be flat (+ 0.25 dB) at all
audio frequencies.
Set oscillator to 100 Hz. Slide BASS
Control up to maximum boost position.
Output level should increase 10 dB (+ 2 dB)
as measured on VTVM. Slide BASS Con-
trol down to maximum cut position.
Output should decrease to 10 dB (+ 2 dB)
below O dB reference level. Center BASS
Control.
Set oscillator to 1 kHz. Slide MID Con-
trol up to maximum boost and observe
for an increase of 8.5 dB (+ 1 dB).
Slide MID Control down to maximum
cut.and observe for a decrease of 8.5 dB
(+ 1 dB) below O dB reference level.
Center MID Control.
Set oscillator to 10 kHz. Slide TREBLE
Control up to maximum boost. Output
should increase 10 dB (+ 2 dB). Slide
control down to maximum cut and observe
for a 10 dB (+ 2 dB) decrease below 0 dB
reference level. Center TREBLE Control.
TURNOVER FREQUENCIES (Figure 2-5)
Set oscillator frequency to 50 Hz. De-
press 250 Hz TURNOVER Switch.
Slide BASS Control up to maximum
boost. Output signal level should increase
6 dB (+ 1 dB). Slide BASS Control down
to maximum cut. Output signal level
should decrease 6 dB (+ 1 dB). Center
(3)
(4)
(5)
N.
(1)
(2)
(3)
P.
(1)
(2)
(3)
(4)
BASS
Control.
Depress
and
release
250
Hz
TURNOVER
Switch.
Set
oscillator
frequency
to
17
kHz.
De-
press
4
kHz
TURNOVER
Switch.
Slide TREBLE Contro! up to maximum
boost. Output signal level should increase
6 dB (+ 1 dB). Slide TREBLE Control
down to maximum cut. Output signal
boost. Output signal level should increase
6 dB (+ 1 dB). Slide TREBLE Control
down to maximum cut. Output signal
level should decrease 6 dB (+ 1 dB). Cen-
ter TREBLE Control. Depress and release
4 kHz TURNOVER Switch.
,Press TONE DEFEAT Switch in.
VOLUME TRACKING
Connect oscillator to AUX INPUT Jack.
Depress AUX Switch. Rotate VOLUME
Control to maximum. Monitor signal at
PREAMP OUTPUT Jack with AC VTVM.
Set
oscillator
frequency
to
1
kHz.
Set
oscillator
output
for
a
O
dB
output
level
at
VTVM.
Reduce volume in 5 dB increments while
monitoring
both
outputs
of
the
preamp.
Right
and
left
channel
output
levels
should
be
within
+
3
dB
of
each
other
down
to
-40
dB.
Output
levels
should
be
within
+
4
dB
of
each
other
from
-40
dB
to
50
dB.
LOUDNESS
CONTOUR
(
Figure
2-6
)
Connect oscillator to AUX INPUT Jack.
Depress AUX Switch. Monitor output at
PREAMP OUTPUT Jack with AC VTVM.
Set oscillator frequency to 100 Hz, 10 dB
at PREAMP OUTPUT Jack.
Reduce oscillator output to -30 dB at the
VTVM.
Depress LOUDNESS Switch. Signal level
should increase 6 dB (+ 1 dB).
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