PROBLEMS?
M1 HPAP issue 1 Page 9 of 11
Basic p
roblem-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 Mains power supply is not fully inserted
into mains socket
Mains power supply lead is not fully
inserted into rear socket
Plug in securely
No sound Wrong connections between input
sources and the unit
Check audio input lead
connections
Sound is not precise, lacking in
bass and stereo image
Headphone(s) connector plug not fully
pushed in
Lead fault in headphones
Check plug is inserted fully and
securely
Check phones on Headphone
output of a different unit
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 screen
directly connected 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.8 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.8 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 suffer. This is not a fault. Try
running fewer applications if
possible.
If none of these actions affect a cure, please contact the dealer, or an authorised Musical Fidelity service agent.
Never open the case of the unit, as this will invalidate the guarantee.
(13 pages)
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