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I have run into a number of Mackie 808 (M & S) where the SSM2164 compression ic is bad.
In one case the -15 volt regulator was bad.
In two others the main connector came half off the header.
In all three cases the -15Vdc was down but not the +15Vdc.
The amps exhibited a funky high side of the output waveform.
On one, the upper wave would widen at about 10V output (with or without a load)
The other two the upper wave would squash .
Traced all three failures to the SSM2164 ic. (hard to get, I know).
Then I come across this link where the article starts with the following statement:
"1-The SSM2164 exhibits a catastrophic failure mode when the V+ pin is powered and the V- pin disconnected . The symptom is massive current flow into V+ pin resulting in internal heating, which, if not limited, results in destruction of the die."
Huh.
Interesting, as that is what I have been seeing.
Here is the link: The Electronic Sea | SSM2164
In one case the -15 volt regulator was bad.
In two others the main connector came half off the header.
In all three cases the -15Vdc was down but not the +15Vdc.
The amps exhibited a funky high side of the output waveform.
On one, the upper wave would widen at about 10V output (with or without a load)
The other two the upper wave would squash .
Traced all three failures to the SSM2164 ic. (hard to get, I know).
Then I come across this link where the article starts with the following statement:
"1-The SSM2164 exhibits a catastrophic failure mode when the V+ pin is powered and the V- pin disconnected . The symptom is massive current flow into V+ pin resulting in internal heating, which, if not limited, results in destruction of the die."
Huh.
Interesting, as that is what I have been seeing.
Here is the link: The Electronic Sea | SSM2164