Engl SOVEREIGN 100, Руководство оператора

Страница: 28 / 36

amp and another device that is grounded via a power plug of its own?
Two or more circuits sharing a common electrical ground line can cause
audible hum. If low-frequency noise is emanating from your rig,
be sure to consult a specialist.
-> The amp and mains grounds are not connected properly or are altogether
disconnected. Have an experienced specialist check this.
-> Cords connected to the input or effect loops may not be shielded properly.
Replace them to check if this is indeed the case.
-> The amp or speaker cords may be picking up interference from powerful
magnetic fields (for example, of nearby power transformers or electrical motors).
Reposition the amp and connector cables.
-> The amp or speaker cords may be picking up radio signals, for example,
from activated mobile telephones or powerful local transmitting stations nearby.
Switch off mobile phones while troubleshooting noise problems.
-> If you are feeding the signal to recording equipment or a mixing console via
the amp's and the XLR Ground (49) button is set to Pin 1 to Ground,
the problem may be a ground loop that has been formed with the connected
device's ground. Set the button to Ground Lifted.
-> The given power tube is defective and must be replaced if the electronic circuit
breaker continues to trip after several attempts to reset the Tube Monitoring
System by flipping the Standby switch off and back on again.
-> The amp has been overloaded, perhaps by excessive volume levels,
mains over-voltage, or the wrong output impedance (the impedance setting
does not match the connected speaker's impedance).
To protect your amp from damage due to overheating, please ensure the cooling
fans remains in operation at all times, especially during lengthy gigs or other
occasions when your amp´s operating temperature is high.
For recording in the studio or other applications that demand absolutely silent
operation, you may disconnect the power supply to the fan pulling the central
power supply plug (see tube map on page 30). Ensure the fan is not off for longer
period of time; one to two hours, depending on the ambient temperature.
Line Out
The electronic power amp protection circuit has tripped:
Important note concerning the cooling fans:
28