Quilter Pro Block 200 Owner's Manual - page 9
Pg. 9
Background hum
• Ensure the guitar plug is fully inserted.
• Try using a different guitar cable. Make sure it is
properly shielded.
• 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, especially for hum or buzz.
Amp sounds garbled at all
volumes
• Check speaker by temporarily trying an external
speaker. Caution: reduce MASTER volume until
sound level has been confirmed.
• Try plugging instrument directly into the amp,
bypassing outboard processing. If sound is then
clean, check outboard processing for problems.
Desire clean tone, getting
too much overdrive
• Turn down the GAIN control and turn up MASTER.
Desire overdrive tone, not
getting enough overdrive
• Turn down MASTER and increase GAIN until the
desired overdrive is obtained, then reset MASTER
to desired loudness.
• Turn up guitar volume.
• Try higher output pickups.
Tone sounds “dull” with no
high frequencies
• Confirm EQ settings.
• 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 or AC cord 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
TROUBLESHOOTING: