
Front anel Indicator Lamp
What to do if there is hum or ground noise:
The small blue ED lamp indicates that
the power is connected to the REF500
and that the power switch is in the ON
position. If the amplifier detects a fault
or short circuit in the output connec-
tions then it will go into a protection
mode and stop playing. If this occurs
toggle the power switch to the OFF
position and check the speaker cabling
to insure that no speaker output is
either shorted together or connected to
a ground. When you are certain that
the loudspeaker cabling is correct,
power the unit ON again and insure
that the Blue lamp is lit and that music
will play.
Fuse rotection
There is an internal fuse protection on
the REF500. If the power switch is in
the ON position, the power cable is
connected to a functioning power out-
let at the correct voltage and the Blue
lamp is not lit,this indicates that the
internal fuse may have blown. If this
occurs contact your dealer, distributor
or Bel Canto for service. There are no
user replaceable fuses or other parts.
Opening the chassis will void your
warranty.
page 7© 2008 bel canto design, td.
1) Check that the RCA/X R switch is in
the correct position for the type of
connection being used.
2) Insure that the preamplifier or any
source components are not produc-
ing hum by setting the preamplifier
to a MUTE or Standby setting.
3) The design of the REF500 reduces the
chance for ground loop induced hum
but we still recommend that you use
shorter interconnect cables to the pre-
amplifier and connect all power cables
to a common outlet box or power
conditioner unit to reduce the possibil-
ity for ground current noise being
induced into the audio signal path. If
you choose to power your source and
preamplifier components from a dif-
ferent AC supply than used for the
REF500 amplifiers, we recommend
that you use a high quality balanced
X R cable driven from a true balanced
X R preamplifier output. We do not
recommend that you resort to ‘cheater
plugs’ or some other means to dis-
connect the power ground from the
REF500 as this may lead to dangerous
operation and void the warranty.
REF500 User’s Guide 0808 Rev. A