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M5si manual issue 1 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.
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.
No audio output, or too
low level output.
Incorrect or missing connections
Check connections and make sure they are secure.
Turntable/phono hum
excessive
Turntable not earthed or needs earthing
Turntable already earthed and earthing
further creates hum loop in system
Earth loops already in system
Audio connector plug not fully pushed in
Cable fault
Unsuitable Cable
(e.g. cable grounds not connected)
Check turntable earthing lead is connected to earthing post
on M5si.
Disconnect earthing lead from earthing post.
Investigate for earth loops elsewhere in system.
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 AND
outputs, please use good quality screened coax; fully
connected signal-to signal, screen-to-screen.
No sound - USB
USB device not working
USB cable unplugged or not securely fitted
Mixer volume turned down
Check USB input lead is securely connected.
See “USB” P.10 to check computer has recognised and is
using “M5si Integrated 24/96” for playback.
Check volume control on computer is turned up. See note
P.10 about “For best results from USB input”
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.
Ensure such sources are not shining directly on the infra
red window as this could swamp the 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 M5si, as this will invalidate the guarantee.
PROBLEMS?
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