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MOON i-7 Dual-Mono Integrated Amplifier
Troubleshooting
Your MOON i-7 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 "HIGHTEMP" will appear in the display. If your
i-7 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 more) of your source components. You must determine if there is any DC present. The best way to accomplish this is by
first powering down the i-7 via the main power rocker switch, then physically removing all inputs to the i-7 leaving only the
speakers connected. Attempt to power up your i-7 again: A successful power up will indicate the presence of DC coming
from one of your signal sources (ie. CD Player).
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 other. For example, when one conductor is carrying a signal of +10 Volts, the other will be carrying a
signal of –10 Volts. When these two inverted signals on a balanced line are output from the MOON i-7, any noise picked up
by the 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 not be processed.
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Troubleshooting / Balanced Operation
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