Accuphase C-280 - Page 11

OPERATING INSTRUCTIONS
= To play a phonograph record
Confirm that the turntable output
cables are correctly connected to the
left and right DISC 1 or DISC 2 jacks
on the rear panel. Also be sure the
turntable ground cable has been con-
nected to one of the rear panel GND
jacks. Then perform the following
steps.
[1] Turn down the volume control O р
turn оп the power switch and set
the input selector (2) to the DISC 1
or DISC 2 position depending on
which set of jacks is being used.
If the turntable is equipped with
an MM (moving magnet) or other high
output type cartridge which
requires no step-up device, set the
head amp selector to the OFF/MM
position. If an MC (moving coil)
cartridge is being used, the built-
in head amp must be used. The +26dB
position will provide sufficient
gain for most MC cartridges.
Next, set the MC load selector to
the proper setting for the impe-
dance of the MC cartridge. The load
impedances of MC cartridges range
between арркох. 2 ohms and 50 ohms.
As a rule, MC cartridges requiring
a load impedance of 20 or more ohms
should be used with the 100-ohm
setting and cartridges having a
rating below 20 ohms with either
the 30-ohm or 10-ohm setting.
Generally, a load impedance about
two to three times higher than the
specified cartridge load impedance
is appropriate.
[4] Confirm that the attenuator 49 15
in the OFF position and that the
tape monitor selector is in the
SOURCE setting.
As soon as the stylus has been
lowered onto the record, raise the
volume to the desired listening
level. If the cartridge being used
has an output voltage of 0.1 mV (at
a cutting velocity of 5 cm/sec, 1
kHz) or less, set the head amp
selector
(3)
to
the
*32dB
setting
to
obtain
an
adequate
amount
of
gain.
However,
when
using
high
out-
put MC cartridges having an output
voltage of 0.5mV (5 cm/sec, 1 kHz)
or more, the +32dB position may
result in excessive distortion.
[6] Press the mode selector (5) to
change to the MONOPHONIC mode to
confirm that the sound image is
properly centered. Then use the
compensator to boost the low
and high end frequencies if
necessary.
If the record is seriously warped,
the resulting low frequency reso-
nance will cause the woofers to
"pump", i.e., move back and forth
at a subsonic frequency, which
interferes with their proper per-
formance. In this case, turn on the
subsonic filter switch O to eli-
minate such unwanted subsonic fre-
quency signals.
Finally, when using an MC
cartridge, ascertain that the impe-
dance setting performed in Step
is correct. This is necessary
because even some low impedance MC
cartridges perform best at the
100-ohm setting. Therefore, compare
sound quality at each impedance
setting to be sure you are using
the optimum setting.
в Radio reception
Confirm that the tuner output cables
are correctly connected to the left
and right TUNER jacks 49 on the rear
panel. Also confirm that the tape
monitor selector G) is in the SOURCE
setting. Then set the input selector (2)
to the TUNER position and raise the
volume to the desired listening level.
Since the output levels of the turn-
table and tuner may be different, the
volume level may change when the input
selector is changed to the TUNER posi-
tion. Adjust the output level control
on the tuner to correct this problem.
в To play back or record a tape
Confirm that the tape deck LINE IN
jacks are connected to the rear panel
REC jacks and the LINE OUT jacks to
the rear panel PLAY jacks KE . Also
confirm that all left and right con-
nections are correct.
=