Regulator problem fixed .
Now I have another problem .
If I leave the audio driverboard out of the amp it will power up fine
If I install the audio driverboard the amp protects .
I checked the driver ic’s and they check fine is there anything else on these boards that will make the amp protect ?
Now I have another problem .
If I leave the audio driverboard out of the amp it will power up fine
If I install the audio driverboard the amp protects .
I checked the driver ic’s and they check fine is there anything else on these boards that will make the amp protect ?
Attachments
It could be that the driver board is causing DC to be driven to the output of the amp.
It could also be that there is a problem with the over-current protection on the driver board.
Are the outputs in the circuit?
It could also be that there is a problem with the over-current protection on the driver board.
Are the outputs in the circuit?
The outputs were in circuit .
I powered the amp up and it went into protection
I shut it down and powered it back up amp would sit and idle for 30 secs then protect did this a couple times then it blew the outputs .
I powered the amp up and it went into protection
I shut it down and powered it back up amp would sit and idle for 30 secs then protect did this a couple times then it blew the outputs .
Is rail voltage building fully before the output stage starts to oscillate?
Are there any damaged vias on the driver board?
Are there any damaged vias on the driver board?
No damaged vias on the driverboard .
I will check to see if the rail voltage builds fully before the outputs stage starts to oscillate .
I will check to see if the rail voltage builds fully before the outputs stage starts to oscillate .
I replaced all of the ic’s on the audio driver board .
Also replaced all of the smd transistors on the driverboard with the exception of the ones labeled max .
Amp will power up and idle perfectly without the audio driver board installed
If I put the audio driverboard in the amp it will
Power up for about 20 secs then protect and blow an output.
The original problem was that a speaker wire got grounded out to the case of the amp .
Any ideas on what to check ?
Also replaced all of the smd transistors on the driverboard with the exception of the ones labeled max .
Amp will power up and idle perfectly without the audio driver board installed
If I put the audio driverboard in the amp it will
Power up for about 20 secs then protect and blow an output.
The original problem was that a speaker wire got grounded out to the case of the amp .
Any ideas on what to check ?
Some more messing with this amp .
If I power the amp up after sitting awhile it will protect if I cycle the remote wire 5 or 6 times the amp will power up and play clean audio .
Amp will play about 3 mins clean audio then it will protect again if I cycle the remote wire again 5 or 6 times it will play clean audio again .
Any ideas what might cause this ?
If I power the amp up after sitting awhile it will protect if I cycle the remote wire 5 or 6 times the amp will power up and play clean audio .
Amp will play about 3 mins clean audio then it will protect again if I cycle the remote wire again 5 or 6 times it will play clean audio again .
Any ideas what might cause this ?
Still can’t figure this out been checking everything and everything I test checks good .
Any ideas on what might cause this issue ?
Any ideas on what might cause this issue ?
It shuts down when idling .
When the amp starts to protect I get a spike of 4 volts across the speaker terminals
When the amp starts to protect I get a spike of 4 volts across the speaker terminals
What do you mean by 'starts to protect'? Can you see something change that tells you that it's about to shut down?
What sort of spike? A short pulse or a 4v DC output that lasts until the amp shuts down?
What sort of spike? A short pulse or a 4v DC output that lasts until the amp shuts down?
Sorry I worded that wrong .
The voltage measured directly across the speaker terminals is 0.1 volts
As soon as the amp protects and the really clicks I bet a 4 volt spike across the output terminals
I get a voltage spike across speaker terminals when the amp protects and install drops back down to 0 volts
The voltage measured directly across the speaker terminals is 0.1 volts
As soon as the amp protects and the really clicks I bet a 4 volt spike across the output terminals
I get a voltage spike across speaker terminals when the amp protects and install drops back down to 0 volts
So, the voltage across the speaker terminals is 0.1v up until the instant that the relay disengages. Is that correct?
Does a speaker connected to the speaker terminals pop when the amp goes into protect?
Does a speaker connected to the speaker terminals pop when the amp goes into protect?
Does heating/cooling any of the components change the way it goes into protect?
What about pushing on various parts of the board?
Left idling, do you see a change in the pulse width in the r-r oscillation as it goes into protect?
What about pushing on various parts of the board?
Left idling, do you see a change in the pulse width in the r-r oscillation as it goes into protect?
It might be easier to track down now .
Whatever it is was Intermittently causing problems now the amp will not come out of protection mode and the clip light is on also
Whatever it is was Intermittently causing problems now the amp will not come out of protection mode and the clip light is on also
I think the problem still is in the regulator circuit .
I have 15 volts at the regulators but only have -12 volts at opamp and + 2 volts at opamp
I have 15 volts at the regulators but only have -12 volts at opamp and + 2 volts at opamp
What's the resistance from the +15v regulator output to the positive supply terminal of the op-amps?
Measure the same for the negative circuit.
Measure the same for the negative circuit.
0.2 ohms on both .
The problem I’m having now is the regulated voltage is not right .
From the output terminal of the positive regulator to the positive terminal of opamp I get 0.2 ohms
Negative regulator output to negative terminal of opamp I get 0.2 ohms
If I use the ground leg of the regulators I get +- 15 volts on the regulators .
On the opamps them selfs on pin 4 I get -27.01
On pin 8 I get 3.08
The problem I’m having now is the regulated voltage is not right .
From the output terminal of the positive regulator to the positive terminal of opamp I get 0.2 ohms
Negative regulator output to negative terminal of opamp I get 0.2 ohms
If I use the ground leg of the regulators I get +- 15 volts on the regulators .
On the opamps them selfs on pin 4 I get -27.01
On pin 8 I get 3.08