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PROBLEMS?
Issue 2 Page 11 of 13
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
button is pressed.
Mains power plug is not fully inserted
into rear socket.
Plug in securely.
No sound Mute function is still active.
Wrong connections between input
sources and the unit
Speakers not connected, or incorrectly
wired
Press the MUTE button on the remote control to cancel.
Check audio input lead connections.
Check speaker cables.
Sound cut Loose connection
Output overload or short circuit
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.
Sound is not precise,
lacking in bass and stereo
image.
Speakers are connected out of phase,
i.e., connections to one speaker
(+ and –) are reversed.
Ensure speakers are connected with same polarity at amplifier
and speaker ends.
Hum from speakers 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 analogue
AND digital, please use good quality screened coax; signal
and screens both separately connected at both ends.
Hum from unit Mechanical vibration from transformer
DC on mains
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
low level output.
Incorrect or missing connections Check connections and make sure they are secure.
Remote control does not
work.
Amplifier’s POWER switch is set to off.
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.
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.
Remote control range has
greatly reduced
Batteries are running out 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.