Quilter MicroPro 200 MP200 HEAD Owner's Manual - page 21
A “warbling” or pulsing
sound is heard
• You may be hearing the tremolo effect. Check that
the TREM control is set to its minimum position if this
sound is undesired.
Background hum
• Ensure the guitar plug is fully inserted.
• Try using a different guitar cable.
• Any AC powered sources or effects should be
plugged into the same receptacle as the amplifier to
help avoid ground loops.
If the hum goes away when you turn down the guitar:
• Single coil pickups can be a source of hum, especially
if near RF sources like light dimmers or neon lights.
Some guitars have a mode where two pickups are in
reverse polarity to each other. This mode can often
reduce hum.
• Check that the guitar’s cavities are well shielded.
Excessive noise
• At high gain settings, some audible hiss or whoosh is
normal.
• Check your cables, guitar and other effects in the
signal chain.
Amp sounds garbled at all
volumes
• Check speaker by temporarily trying an external
speaker. Caution: reduce volume until sound level has
been confirmed.
Desire clean tone, getting
too much overdrive
• Turn down the GAIN control and turn up VOL 2.
• Set the Boost Voice Select to OFF.
• Turn up LIM.
• Use the INST-LO input.
• Try using the VOL 1 (CLEAN) Mode
Desire overdrive tone, not
getting enough overdrive
• Use the INST-HI input
• Turn up guitar volume.
• Turn up GAIN.
• Set LIM to its minimum setting.
• Set the MODE switch to FULLQ
• Set the Boost Voice Select to LOUD or HOT and turn
up the Boost Level.
• Try higher output pickups.
Tone sounds “dull” with
no high frequencies
• Set the PRES control to its maximum setting
• Check your guitar’s tone controls.
Amplifier Requires Service
If any of the below occur, immediately unplug the amplifier and refer to a service
technician.
• Amplifier emits smoke
• Amplifier is dropped or chassis is dented or bent
• Liquid has been spilled into the amplifier
• Loose parts inside the amplifier are heard
• AC breaker trips
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