Abbingdon Music Research AM-77 Reference Class User Manual
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4.6 OptiMains® Protection for Excessive Under/Over-Voltages
The AM-77 is fitted with the OptiMains® system to condition and adjust the incoming mains supply for best
operation under all normal mains conditions (including situations that will cause audible problems without Opti-
Mains®).
In almost every country throughout the world, instances do arise where fluctuations in the main electricity exceeds
that of a correctly operating mains supply and any electrical item/product is no longer properly served. In the case
of extreme power surges, brown outs or other exceptional/unexpected conditions that exceed the safety margins,
the OptiMains® system will automatically switch off the mains power to the internal parts of equipment to prevent
any damage from occuring.
If the display reads:
A
C
V
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l
t
a
g
e
O
u
t
s
i
d
e
O
p
e
r
a
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R
a
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e
!
Power OFF your AMR component and wait at least 5 minutes. If and when the mains electricity has been deemed
to have returned to normal (such as during a brown out and the lights have dimmed but have returned to normal
brightness) then power up your AMR component as per the manual’s instructions.