Musical Fidelity Troubleshooting Common Issues for Amplifiers

PROBLEMS?

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:

ProblemProbable Cause

No power when POWER Mains power plug is not fully inserted

button is pressed.	into rear socket.
No sound	Mute function is still active.
	Wrong connections between input
	sources and the unit
	Speakers not connected, or incorrectly
	wired
Sound cut	Loose connection
	Output overload or short circuit

Sound is not precise,	Speakers are connected out of phase,
lacking in bass and stereo	i.e., connections to one speaker
image.	(+ and –) are reversed.
Hum from speakers	Audio connector plug not fully pushed in
	Cable Fault
	Unsuitable cable
	(e.g. cable grounds not connected)
Hum from unit	Mechanical vibration from transformer

DC on mains

Remedy

Plug in securely.

Press the MUTE button on the remote control to cancel. Check audio input lead connections.

Check speaker cables.

Check speaker and input connections.

Switch unit off. Check speaker connections for shorting strands or wires. When all has been double-checked reduce volume and switch unit back on.

N.B. Take great care when bi-wiring or bi-amping that speaker bass and treble linking straps are removed; see speaker manual for more information.

Ensure speakers are connected with same polarity at amplifier and speaker ends.

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 analogue AND digital, please use good quality screened coax; signal and screens both separately connected at both ends.

The transformer in this unit has been carefully engineered to be as quiet as possible using extensively researched transformer technology. There will always be a small amount of mechanical hum heard from the unit. It should not detract from listening enjoyment, and as such, is not indicative of a fault.

All modern transformers suffer increased noise levels when DC conditions arise on the mains. This is a local mains problem (often caused by other connected high power equipment such as boilers, local industrial machinery, etc.), rather than a problem with the unit. The problem may only occur at certain times of the day when the offending appliance(s) are switched on. Mains conditioners will not help (unless they completely reconstruct the mains), the best option is to have the offending appliance(s) identified; and dealt with in accordance to local mains interference regulations.

No audio output, or too Incorrect or missing connections	Check connections and make sure they are secure.
low level output.

Remote control does not	Amplifier’s POWER switch is set to off.
work.	One or more batteries fitted the wrong
	way round.
	Batteries are flat.
	Remote control is not pointed directly
	towards the front panel of the amplifier.
	Interference from another source.

Remote control range has Batteries are running out greatly reduced

Set switch to on.

Insert batteries correctly. Change batteries for a new set.

Ensure there is no obstruction between the remote control and amplifier front.

Lighting such as fluorescent, incandescent, or even sunlight contains large amounts of infra red radiation, as can motion sensors and intruder alarms. Ensure such sources are not shining directly on the infra red lens as this could swamp the infra-red signal from the remote control.

Also check the system and any other nearby remotes for stuck buttons.

Change batteries for a new set.

If none of these actions affect a cure, please contact the dealer, or an authorised Musical Fidelity service agent. Remember; never open

the case of the M6 500i, as this will invalidate the guarantee.

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