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IMPORTANT
one,
——
eeen
eoeow
Installation
Select a dry, level place which is neither too hot nor too
cold (between —5° and 40 °C/23°F and 104 °F).
Leave space between the power amplifier and the wall to
provide good ventilation.
Do
not allow
a curtain, table cloth, etc. to block the
ventilation holes.
Keep the power amplifier away from direct sunlight.
Do not place close to a heater.
Do not place in locations subject to vibrations.
Do not place in locations subject to dust.
Keep as far from a tuner and a preamplifier as possible to
prevent noise.
Power cord
Do not handle the power cord with wet hands.
Do not bend the power cord double.
When
unplugging
from
the wall outlet, always pull the
plug, not the power cord.
Malfunctions
Do not insert any metallic object inside the unit.
Do not allow water to get inside the unit.
Do not employ thinner or benzine to clean the cabinet.
First clean with a neutral cleaner and then wipe with a dry
cloth.
Power switch
Do not plug the power cord into an AC outlet until all
connections are complete.
Switch the power off when connecting other components
to it.
REAR PANEL
1.
Connecting with other components may result in trouble,
such as oscillation or hum. Connect ground terminals of
this set and other components to each other.
SUBSONIC and DIRECT INPUT terminals
Do not connect different kinds of signals simultaneously
to input terminals.
Input cannon connector (for professional use)
(Unbalanced)
AC:
If these terminals
are employed,
the input signal
passes through a filter having a cut-off frequency of
18 Hz and a slope of 6dB/oct, which results in a
reduction of ultra-low frequency noise, such as that
encountered
with
warped
records,
and
prevents
speaker intermodulation distortion.
The filter also eliminates the preamplifier DC leak
voltage, thus protecting the speakers.
DIRECT:
These input terminals are directly connected to the
power
amplification
circuit.
Since
the
M-7050
employes
DC
amplifier
circuitry,
there
is no
coupling capacitor between the input circuit and the
power amplification stages.
Protective circuit
When the protective circuit has been activated, switch off
the power and determine the cause as follows:
The speaker load impedance
Using speakers with an impedance of less than 4 ohms (or
a short circuit across the speaker terminals) activates the
protective
circuit and results in intermittent sound out-
put. When the speaker switch is at the "1 and 2" position,
use a pair of speakers having an impedance of 8
or high-
er, at "1" or "'2" position, use a speaker of 4
or higher.
Input overload
The speaker produces intermittent sounds.
Detecting the offset voltage
The offset voltage of +2 V or more, activates the pro-
tective circuit and results in no sound output.
Caution indicator
When
the
protective
circuit
has been activated,
meter
illumination changes to red.
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