I have a problem with a XTi4000 amplifier from a friend.
When turned on the power, a loud 'bang' is audible from the speaker at channel A. For the rest it works fine. Channel B seems to work fine.
I have the same problem with a CDi4000 amplifier, this has this problem at channel B.
I opened a year ago a topic here on this forum but due to lack of time i never found out whats wrong with it.
It looks like the power supply is running fine. When turned on the amplifier one power supply rail (measured at the front heatsinks)
is low (around 28 volts) and the other rail (measered at the back heatsinks) is high (around 90 volts) but when the amplifier is getting
into the 'ready' mode this rail also dropped into low mode. I seen this beheavior at other XTi amplifiers so i think this is ok. Just to
find out if the tracker modules where OK.
When you shut down the amplifier and immidiatly switch it back on there is no 'bang' at channel A. When you shut down the amplifier, wait
until the voltage accross the 2 rails (measured at the heatsinks) is dropped until 3 volts and then switched on the power amp then the
'bang' is preset again at channel A.
I allready disconnect the front panel PCB, but this doesn't affect the problem.
Can anybody help me?
Patlover1983Member Since 28 Jan 2011
Offline Last Active Yesterday, 07:10 PM
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