Issue 1 Page 11 of 13
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:
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
Wait for the MUTE LED to go out.
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.
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 M8 500S, as this will invalidate the guarantee.
(11 pages)
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