Engl E670 - Troubleshooting Common Issues

6. Power Tube Monitor: A problem or overload in power tube V2;
Indication: LED flashes in 2 short bursts; What to do: Activate and deactivate
Standby.
7. Power Tube Monitor: A problem or overload in power tube V3;
Indication: LED flashes in 3 short bursts; What to do: Activate and deactivate
Standby.
8. Power Tube Monitor: A problem or overload in power tube V4;
Indication: LED flashes in 4 short bursts; What to do: Activate and deactivate
Standby.
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 (53)?
-> Is the MIDI cord you are using intact and wired properly?
(Refer to page 46 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 encoding button (55) 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 A1, A2, B1
or B2 (78, 76, 75, 73)?
-> Is the power amp activated (Standby switch to ON)?
-> Are all cords (guitar, effect, and speaker) connected properly and are they
functional? Use the Cable Check System (86, 87) to determine the latter.
-> Unplug connected effectors and see if the preamp works fine without these
peripheral devices.
-> Is the Noise Gate activated in one of the Lead channels and the Threshold (59)
knob set to a high value? Deactivate the Noise Gate (46) for a quick check.
-> Are the active Master knob and the Gain and Volume knobs set to a value
40