Troubleshooting; Balanced Operation - moon 700i Evolution Series Owner's Manual

700i Reference Dual-Mono Integrated Amplifier
In figure 5 we have a 700i Integrated Amplifier (used either as ONLY a preamplifier or in a bi-amping
configuration) connected to a 870A Power Amplifier via their respective 12V triggers (using a 1/8" mini-jack
cable). When you turn on the 700i via remote control (or its Standby button), the 870A will turn on
automatically. The same rule applies when you put the 700i into Standby mode

Troubleshooting

Your MOON 700i is a "smart" integrated amplifier
equipped with a self-diagnostic system that will
automatically shut itself down when it (i) detects DC
(direct current) from any input or (ii) reaches a
dangerously high operating temperature. When DC
is present, the front panel display will show "DC
LEVEL"; when overheating "OVERTEMP" will appear
in the display. If your 700i powers itself off or will
not power up, there may very well be DC present in
one (or more) of the inputs coming from one (or

Balanced Operation

When using an unbalanced interconnect, the audio
signal runs through both the center wire and the
shield/ground wire. Any noise picked up by this
interconnect (ie. nearby magnetic fields such as an
AC power cord) will be reproduced by the integrated
amplifier, then heard through the loudspeakers.
Conversely, a balanced interconnect has three
separate conductors; one for the ground and two for
the actual signal. These two signals are identical
except that one is 180 degrees out of phase with the
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Figure 5: Remote Operation with 12V Trigger
more) of your source components.
determine if there is any DC present. The best way
to accomplish this is by first powering down the
700i via the main power rocker switch, then
physically removing all inputs to the 700i leaving
only the speakers connected. Attempt to power up
your 700i again: A successful power up will
indicate the presence of DC coming from one of
your signal sources (ie. CD Player).
other. For example, when one conductor is carrying
a signal of +10 Volts, the other will be carrying a
signal of –10 Volts.
signals on a balanced line are output from the
MOON 700i, any
interconnect will be eliminated since a differential
circuit amplifies only the difference between these
two signals: Noise on a balanced interconnect will be
equal on both conductors and therefore cancel out.
You must
When these two inverted
noise picked up by the
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