AMS100
AMPLIFIER PROBLEMS?
Issue
1
Page 9
of
11
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
turned on
Mains power plug is not fully inserted
into rear socket
No mains power
Plug in securely
Check socket with another appliance
Unit not coming on via TRIGGER input
Mains power not present
Trigger lead disconnected
Triggering unit not sending trigger signal
Check unit is plugged in and switched on
(back panel switch).
Check lead is fully connected and
triggering unit is on and sending a trigger
signal (±5 to 12V nominal)
Noisy or reduced sound
Wrong input selected
Both RCA and XLR inputs connected to
source(s)
Move RCA/XLR switch to correct
position
Remove unwanted source.
Sound is not precise, lacking in bass and
stereo image (when used in conjunction
with other unit(s))
Speakers are connected out of phase, i.e.,
connections to one speaker (+ and -) are
reversed on one or more units
Ensure speakers are connected correctly:
+ terminal on amplifier goes to + terminal
on speaker,
- terminal on amplifier goes to – terminal
on speaker.
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
air circulation. Allow to cool down
before attempting to switch on again
Flashing RED LED
Short circuit in speaker (output) leads
Problem in speakers
Grounded via speaker
Check speaker leads connected to
SPEAKER OUTs on AMS100
and
speaker ends for stray strands or short
circuits.
Check speakers and wiring.
Wait 30 seconds before switching back
on, and apply music source.
Both the + and – speaker output
terminals on this unit are “hot”. Some
speakers e.g. active subs and
electrostatics have “grounded” inputs.
Such speakers are incompatible with the
AMS100.
Hum
Audio connector plug not fully pushed in
Input not correctly selected
Cable Fault
Unsuitable Cable
(e.g. cable grounds not connected)
Insert plug securely
Move input switch to correct position
Check cable is connected at both ends.
N.B. some esoteric cables have internal
wiring intentionally
disconnected/modified. For best results
on all inputs, please use good quality
straight- through cables, signal lead(s)
directly connected at both ends and
earth/screen(s) directly connected at 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 AMS100 yourself, as this will invalidate the guarantee.
