Troubleshooting
Programmable features fail to respond when you change settings:
The preamp fails to respond when you try to switch presets via MIDI foot board.
The preamp is not providing an output signal / no sound is emanating from the
speaker/s.
The speaker, recodring device or P.A. system is emitting humming noises:
-> Powerful static charges, strong radio signals or mains voltage spikes can affect
microcontroller-driven systems, setting them to an undefined status (commonly
called a hung chip). In this event, your only choice is to reset the system.
Simply switch the preamp off and on again.
-> If a reset doesn't solve the problem that is, the chip is still hung there
is a defect in the control system (presumably on the logic board holding
the microcontroller). In this case, consult an authorized service center
or a professional specialist.
-> Is the MIDI foot board connected to the MIDI IN port (55)?
-> Is the MIDI cord you are using intact and wired properly?
(Refer to page 30 for pin assignments.)
-> Is the preamp set to the MIDI channel over which the MIDI foot board is sending
program change commands? You can set the encoding button S1(57) to OMNI
reception to check if the preamp is actually receiving data.
-> Is another foot board (the ENGL Z-9 or a two-way footswitch) connected and
therefore blocking MIDI reception?
-> Are all cords (guitar, effect, poweramp and speaker) connected properly
and are they functional?
-> Unplug connected effectors and see if the preamp works fine without these
peripheral devices.
-> Check the function of the connected poweramp and the cabinets.
-> Is the Noise Gate activated in one of the Lead channels and the Threshold (40)
knob set to a high value? Deactivate the Noise Gate (33) for a quick check.
-> Are the Master knob and the Gain and Volume knobs set to a value
greater than 0? If any of these knobs is set to 0, no signal is routed
to the preamp's outputs.
-> Did you send via MIDI foot board a MIDI controller 7 command with
a value less than or equal to 5? This activates Master Volume Mute,
thereby silencing the preamp.
You can check this by deactivating the Master Volume Mute by resetting
the appropriate encoding button (57) accordingly.
-> You may be looking at a faulty tube or another defect. In this case,
be sure to take the preamp to an authorized, professional service center.
-> Is the Ground Lift switch (38) set to Ground? If you are operating the
preamp with other grounded gear (power amp, effect devices) connected,
this switch must be set to the "Ground floated" position; otherwise, it's goodbye
26
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