Troubleshooting
Programmable features fail to respond when you change settings:
The amp fails to respond when you try to switch presets via MIDI foot board.
The amp is not providing an output signal / no sound is emanating from the
speaker.
-> 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 amp 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 (44)?
-> Is the MIDI cord you are using intact and wired properly?
(Refer to page 35 for pin assignments.)
-> Is the amp set to the MIDI channel over which the MIDI foot board is sending
program change commands? You can set the DIP switch (46) 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?
-> Is at least one speaker connected to the speaker outputs
(62, 63)
(64, 65) or
(66)?
-> Is the power amp activated (Standby switch to ON)?
Standby / power amp off => The Mute LED (36) on the front panel
indicates the Amp Mute status.
-> Are all cords (guitar, effect, and speaker) connected properly and are they
functional?
-> Unplug connected effectors and see if the preamp works fine without these
peripheral devices.
-> Is the
activated in one of the channels
,
or
and
the Threshold (49) knob set to a high value? Deactivate the
(17)
for a quick check.
-> Are the active 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 amp's outputs.
-> Did you select a MIDI preset programmed with
enabled?
The front panel Mute LED (36) lights up to indicate
is active.
-> Did you send via MIDI foot board a MIDI controller #7 (or #28) command
with a value more than or equal to 5? This activates A
, thereby
silencing the amp. The front panel Mute LED (36) lights up to indicate
is active.
4 Ohms
, 8 Ohms
16 Ohms
Noise Gate
CH2 CH3
CH4
Noise Gate
Amp Mute
Amp Mute
mp Mute
Amp Mute
31
