* High ambient temperatures place an additional strain on diverse components; so
if at all possible, avoid operating the amp at temperatures far higher than 30°C
for longer periods. Running the amp at mains voltages exceeding the nominal
mains input voltage over longer periods can also shorten component life.
* Replace tubes with selected tubes that satisfy ENGL selection criteria to forestall
microphonic properties, undesirable noise and unbalanced power amp signals.
Because power tubes' idle current (bias) must checked and possibly adjusted
when replacing tubes, this is a job best left to experienced and authorized
specialists.
-> 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, there is a defect in the control system,
probably on the logic board holding the microcontroller or merely a faulty
contact on one of the four stereo footswitch jacks (37, 38, 39, 40). In this case,
consult an authorized service center or a professional specialist.
-> Is the Z-9 footboard connected to the S.A.C. Port (37)?
-> Is the cord you are using stereo, intact, and wired properly?
(Refer to page 23 for pin assignments.)
-> Are the footboards or switching loops connected to the corresponding
footswitch jacks (38, 39, 40)?
-> Are the cords you are using stereo, intact, and wired properly?
(Refer to page 23 for pin assignments.)
-> If you are using footswitches other than an ENGL Z-4 or Z-11, are the switches or
relays inside the boards or switching loop systems off / on Single Pole Single
Throw (SPST) switches? In other words, do these switches continuously connect
to GND when you wish to activate the given function? If you're unsure about the
answers to these questions, consult an authorized service center or a
professional specialist.
Troubleshooting
* Some features that may be controlled remotely using a Z-9 or Z-4 footswitch
fail to respond when you change settings:
* The amp fails to respond when you try to control switching functions remotely
via the Z-9 footboard.
* The amp fails to respond when you try to control switching functions remotely
using a footboard such as the Z-4 or a MIDI switcher such as the ENGL Z-11.
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