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Supercharger 750K
AMPLIFIER SPECIFICATIONS
Issue 3
Basic problem-solving with an amplifier is similar to troubleshooting other electrical or electronic equipment. Always check the
most obvious possible causes first, such as the following examples:
Problem Probable Cause Remedy
No power when POWER switched
turned on
Mains power plug is not fully inserted
into rear socket
No mains power
Plug in securely
Check socket with another appliance
No sound Wrong input selected
Wrong connections between input
sources and the unit
Speakers not connected, or incorrectly
wired
Mute on driving amplifier enabled
Move input XLR/RCA and
LINE/SPEAKER input switches to the
correct position
Check correct input has been wired in
(loudspeaker or line input)
Check speaker cables at both ends.
Check and disable mute function.
Sound is not precise, lacking in bass and
stereo image (when used in conjunction
with other unit(s))
Speakers are connected out of phase, i.e.,
connections to one speaker (+ and -) are
reversed on one or more units
Speaker level inputs incorrectly wired
Ensure speakers are connected correctly
on all units:
+ terminal on amplifier goes to + terminal
on speaker,
- terminal on amplifier goes to – terminal
on speaker.
If using speaker level inputs, check the
connections are correct at both ends as
above.
Note: Most cables have polarity markings
to help get this right.
Unit cuts out, orange LED lit Overheating
Short circuit in speaker (output) leads
Problem in speakers
Grounded via speaker
Make sure unit is situated to allow free
air circulation.
Check speaker leads connected to
SPEAKER OUTs on 750K and speaker
ends for stray strands or short circuits.
Check speakers
Both the + and – speaker output terminals
on this unit are “live”, i.e. carry
substantial signal. Some speakers e.g.
active subs and electrostatics have
“grounded” inputs. Such speakers are
incompatible with the 750K.
Unit cuts out, red LED lit Clipping
Grounded via speaker
Reduce volume level on driving amplifier
Switch off unit using rear panel mains
switch
Wait 30 seconds before switching back
on, and apply music source.
Both the + and – speaker output terminals
on this unit are “live”. Some speakers e.g.
active subs and electrostatics have
“grounded” inputs. Such speakers are
incompatible with the 750K.
Hum Audio connector plug not fully pushed in
Cable Fault
Unsuitable Cable
(e.g. cable grounds not connected)
Insert plug securely
Check cable is connected at both ends.
N.B. some esoteric cables have internal
wiring intentionally
disconnected/modified. For best results
on all inputs, please use good quality
fully screened coax; signal connected
both ends and earth/screen connected
both ends.
If none of these actions affect a cure, please contact your dealer, or an authorised Musical Fidelity service agent. Remember; never
open the case of the 750K yourself, as this will invalidate the guarantee.
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