Troubleshooting - Komet Aero 33 Owner's Manual

TROUBLESHOOTING

When troubleshooting a problem, we recommend that you remove all effects pedals and only go
direct with your guitar and guitar cable into the amplifier. Also, remove any attenuation device
from your amplifier to speaker cabinet signal chain. This way you can easily and quickly rule out
(or discover) if your amplifier is the source of the problem.
Pilot Light Not On:
Check to see if the amplifier's AC cable is plugged in at wall and plugged in at the IEC
connection on the back panel of the amp. Make sure the DIN AC cable plug is securely inserted
into the IEC AC input connection, and pushed in all the way.
Check the type 47 pilot light bulb. It may be burned out. For bulb replacement, gently turn the
jewel lens cap counterclockwise and remove. Using the tips of your fingers, gently push and turn
the exposed bulb counterclockwise, extract bulb and replace. Note: your amplifier will continue
to operate with no problem with a shorted bulb or with no bulb at all.
Check the 3 amp slow blow AC supply Mains fuse to see if it is blown. Replace the blown
" " " "
fuse with a new 3 amp slow blow or a 2 amp slow blow for a 240V
" " (a.k.a. MDL 3A 250V) " "
model. ALWAYS - make certain that your AC power cable is unplugged when replacing any
fuse.
Mains Fuse - blowing :
" "
Unplug amplifier from the wall AC. Remove the power tubes . Install a
(see precautions section)
new 3 Amp slow blow fuse . Plug into the wall AC and turn the amp
" " 2 Amp "slow blow" 240V)
on .
(with no power tubes in the sockets)
Should the mains fuse continue to "blow", (with no power tubes installed) then your amp will
need to be serviced. If the fuse does not blow , and the amp lights up, turn amp off, and install a
" "
new set of matched EL84 power tubes. Turn the amp back on. If the fuse does not blow, play
the amp and monitor.
Amp Lights Up - No Sound:
Check the speaker connection at back of amp and at the input of the speaker cabinet. Bypass all
pedals and effects and plug your guitar into only the amplifier. Check the guitar cable and / or
try another guitar.
Check the power and the pre amp tubes and make sure that they are installed correctly and that
the filaments within each tube are lit. sometimes audio tubes can look operational
Note: - (with
but be defective in not passing signal. This is rare, but can occur.
the filaments lit) -
Check / test / replace - the H.T. fuse for continuity with a digital Ohm meter. It may be blown.
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