Marantz PM-14S1 - Manual (Page 32)

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ENGLISH
MM/MC cartridge select
There are two types--MM (Moving Magnet) and MC (Moving
Coil)--of cartridges for turntable.
As the output levels for these two types of cartridges differ,
the setting of the phono equalizer that is mounted in this unit
must be switched according to the type of cartridge for your
turntable. For switching, use the PHONO MC button on this
unit.
Speaker impedance
This is an AC resistance value, indicated in Ω (Ohms). Greater
power can be obtained when this value is smaller.
Protection circuit
This is a function to prevent damage to devices within the
power supply when an abnormality such as an overload,
excess voltage occurs or over temperature for any reason.
If a malfunction occurs in this unit, the power indicator blinks
red and the unit switches to standby mode.
Appendix
Explanation terms
This unit is equipped with a protection circuit to protect the
amplifier circuits and speaker system from damage.
If the protection circuit is activated, the sound is instantly
muted.
In this case, the message “PROTECT” flashes on the display
panel, and the STANDBY indicator also flashes.
To deactivate the protection circuit, turn the unit off then back
on again after about 1 minute or more.
At power on
For about 8 seconds after the power is turned on, the protection
circuit is activated, muting the sound to give the amplifier
circuits time to stabilize. Once the amplifier circuits stabilize,
the protection circuit is released, and audio is enabled.
In the event of overcurrent
The protection circuit is activated if current exceeding a certain
level is detected, which can happen if excessive signal flow is
input to the amplifier or if the unit is connected to a speaker
system of less than 4 Ω/ohms impedance. The protection
circuit is also activated if a speaker cable shorts.
In such cases, the message “PROTECT” flashes on the display,
and the volume is automatically reduced. After approximately
8 seconds, the protection circuit is released. Therefore, the
volume needs readjusting to continue normal use.
If the overcurrent continues, the amplifier shuts itself OFF,
and the STANDBY indicator flashes.
To deactivate the protection circuit, turn the unit off then back
on again after about 1 minute or more.
If excessive ultrabass signals are input
The protection circuit is also activated if ultrabass signals are
input. In such a case, the STANDBY indicator flashes, and
the volume is automatically reduced. After approximately
8 seconds, the protection circuit is released. Therefore, the
volume needs readjusting to continue normal use. If excessive
ultrabass signal input continues or if DC voltage is detected
owing to trouble with the amplifier, the amplifier shuts itself
OFF, and the STANDBY indicator flashes.
To deactivate the protection circuit, turn the unit off then back
on again after about 1 minute or more.
About the protection circuit
If the main-amplifier overheats
The protection circuit is activated if the temperature of the main
amplifier section rises above a certain level, which can happen
if the amplifier is continuously used with excessive signal flow
being input to it. The protection circuit is also activated when
the specified operating temperature is exceeded, which can
happen if the vents on top of the amplifier are covered or if
the amplifier is installed on a cramped audio rack. In such
a case, the STANDBY indicator flashes, and the volume is
automatically reduced. After approximately 8 seconds, the
protection circuit is released. Therefore, the volume needs
readjusting to continue normal use.
If the temperature does not sufficiently fall within a certain
amount of time after the protection circuit activation, the
amplifier shuts itself OFF, and the STANDBY indicator flashes.
To deactivate the protection circuit, turn the unit off, let it
stand until it cools down, then turn it ON again.
In the event of amplifier trouble
The protection circuit is activated, and the power is
automatically shut OFF, if an abnormality is detected in the
power circuit. The same happens if the main fuse inside
the amplifier blows. In such cases, the STANDBY indicator
flashes.
Turn the unit off then after several minutes turn it on again.
If the display does not light up, and the STANDBY indicator
remains flashing after the unit is turned on again, the unit may
be in failure.
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