Amp powers up and then goes into protection mode .
I noticed I get 7 volts of DC measured directly across the speaker terminals when the amp powers up
All the outputs test fine .
Any ideas ?
I noticed I get 7 volts of DC measured directly across the speaker terminals when the amp powers up
All the outputs test fine .
Any ideas ?
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I need to know exactly the version of the amp, as they have versions with ir2010 as gate drivers, irs20957 and irs 2092
you'll see voltage across the speaker terminals as it has no negative rail so 0 is half of rail. I do not know if this is true in all full bridge amplifiers.
It should do a health check prior to starting up however so you shouldn't see anything in protect or have it do a health check, start and then protect as it should never start unless the fault can only be detected after it gets a green light which is a good indicator on where to look. I could be wrong if it is not like the new versions and doesn't run diagnostics first.
It should do a health check prior to starting up however so you shouldn't see anything in protect or have it do a health check, start and then protect as it should never start unless the fault can only be detected after it gets a green light which is a good indicator on where to look. I could be wrong if it is not like the new versions and doesn't run diagnostics first.
'Across' the speaker terminals means from one speaker terminal to the other, not to ground.
There is no voltage (other than a fraction of a volt of offset) across the speaker terminals.
There is no voltage (other than a fraction of a volt of offset) across the speaker terminals.
Sorry yes i was thinking using my scope which would be ground on ground and both terminals have positive DC of half rail. That was my confusion and I'll fix that.
Perry, is this true with all full bridge?
Perry, is this true with all full bridge?
Not all but many. Almost without exception, all 4080 based amps, most all class D out of Brazil, many (all?) JL class D amp use a single rail.
JBL and others have ±rails. One example:
http://www.bcae1.com/temp/bp1200p1_sm.pdf
JBL and others have ±rails. One example:
http://www.bcae1.com/temp/bp1200p1_sm.pdf
Back to this amp .
When the amp powers up o get -28 volts measured directly across the speaker terminals.
All outputs test fine .
Any ideas ?
When the amp powers up o get -28 volts measured directly across the speaker terminals.
All outputs test fine .
Any ideas ?
The problem I’m having g is when I power the amp up . I get -29 volts of dc measured directly across the speaker terminals .
The amp will stay powered up for around 2 secs then protect .
I’ve checked pretty much everything and it all tests good .
So wondering where I go from here
The amp will stay powered up for around 2 secs then protect .
I’ve checked pretty much everything and it all tests good .
So wondering where I go from here
Dies the amp have an LED fault code?
In the brief time that it's on, do you get R-R on either bank of outputs?
In the brief time that it's on, do you get R-R on either bank of outputs?
If you remove the solder blob on J2 the 2092s will not turn off the power supply. Be very careful if you try that.
Is there a Q2 in sot 23 (BC817)? If so, can you lift it?
Although i have the schematics of various versions of this amp, i dont have any voltages written down. But its pretty easy to figure out, i mean, this is an older version with no regulation, so there are no variable voltages on the adc.
I ll try to help with this repair.
Although i have the schematics of various versions of this amp, i dont have any voltages written down. But its pretty easy to figure out, i mean, this is an older version with no regulation, so there are no variable voltages on the adc.
I ll try to help with this repair.