A1 Integrated
AMPLIFIER PROBLEMS?
Issue 2: 05
th
March 2008
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
Unit overheated
Plug in securely.
Check unit’s ventilation holes are not obstructed and
allow unit to cool down. Check speaker/wiring for
short circuits before switching on again.
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 out and/or “Output Overload” displayed
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
USB Driver not selected (PC or MAC)
Check connections and make sure they are secure.
See P.9
PC users
or
MAC users
section
No audio output from USB input
USB Cable not connected
USB Driver not selected (PC or MAC)
Check connections and make sure they are secure.
See P.9
PC users
or
Mac users
section
Not detected when connected to USB
USB Cable faulty
USB not working/enabled on computer
Correct USB drivers not installed
(can happen particularly with factory- preinstalled
Windows operating systems)
Check and replace cable
Check USB port functions with another device.
Please check with the computer manufacturer.
Enquire about USB driver or update.
Dropouts in sound (USB input)
Shared USB port with another device
Computer busy with another application
Computer low on resources
Avoid sharing the USB port with other devices, if
possible.
At times an application (program) may intervene,
sometimes invisibly e.g. a virus scanner. When this
happens, computer resources are temporarily used
up, and playback may falter. This is not a fault. Try
running fewer applications if possible.
Remote control does not work
Amplifier’s
POWER
switch is set to off
Unit overheated
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
Check for excessive heat build-up.
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 A1, as this
will invalidate the guarantee.
