Musical Fidelity Supercharger 750K AMPLIFIER SPECIFICATIONS, Problem, Probable Cause, Remedy

Supercharger 750K AMPLIFIER SPECIFICATIONS

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	Mains power plug is not fully inserted	Plug in securely
turned on	into rear socket
	No mains power	Check socket with another appliance
No sound	Wrong input selected	Move input XLR/RCA and
	Wrong connections between input	LINE/SPEAKER input switches to the
		correct position
	sources and the unit	Check correct input has been wired in
	Speakers not connected, or incorrectly	(loudspeaker or line input)
		Check speaker cables at both ends.
	wired
	Mute on driving amplifier enabled	Check and disable mute function.
Sound is not precise, lacking in bass and	Speakers are connected out of phase, i.e.,	Ensure speakers are connected correctly
stereo image (when used in conjunction	connections to one speaker (+ and -) are	on all units:
with other unit(s))	reversed on one or more units	+ terminal on amplifier goes to + terminal
		on speaker,
		- terminal on amplifier goes to – terminal
	Speaker level inputs incorrectly wired	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	Make sure unit is situated to allow free
	Short circuit in speaker (output) leads	air circulation.
		Check speaker leads connected to
		SPEAKER OUTs on 750K and speaker
	Problem in speakers	ends for stray strands or short circuits.
		Check speakers
	Grounded via speaker	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	Reduce volume level on driving amplifier
		Switch off unit using rear panel mains
		switch
		Wait 30 seconds before switching back
	Grounded via speaker	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	Insert plug securely
	Cable Fault	Check cable is connected at both ends.
	Unsuitable Cable	N.B. some esoteric cables have internal
	(e.g. cable grounds not connected)	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.

Issue 3

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