The relays for the 4channels engages and disengage as soon as I pull the remote.The sub channel relay does nothings.
Does the sub channel have rail-rail oscillation?
Do you have audio reaching the coupling capacitors (C12 a, b, c and d)?
After the relays disengage, do you continue to have oscillation on the 4 channels?
Do you have audio reaching the coupling capacitors (C12 a, b, c and d)?
After the relays disengage, do you continue to have oscillation on the 4 channels?
The relay only engage for a slight second for the 4 channels but that is when i remove the remote wire to turn the amp off.
I get good audio on the 4 channels before the relay.
I see ocsillation on the sub channel but i did not get audio before the relay.
I get good audio on the 4 channels before the relay.
I see ocsillation on the sub channel but i did not get audio before the relay.
Do you have modulation of the square wave on the sub output channels when you drive audio into that channel?
Broken connections on the sub channel inductor?
Do you have 0 ohms between the sub output transistors and the relay input?
Broken connections on the sub channel inductor?
Do you have 0 ohms between the sub output transistors and the relay input?
What is the DCV on the input to the relay when there is oscillation on the sub FETs?
Is this circuit close to what you have? If so, do you see signal on the 'sig' point on PDF pages 25 and 27?
Is this circuit close to what you have? If so, do you see signal on the 'sig' point on PDF pages 25 and 27?
Sub channel has some similarities.
0.756v on relay input while channel is oscillating.
Sub channel drive board has 14 pins.I will inject a signal to see if I can see it on any of the pins.
0.756v on relay input while channel is oscillating.
Sub channel drive board has 14 pins.I will inject a signal to see if I can see it on any of the pins.
Signal is not reaching the SG pin on the driver board.It is directly connected to the SING pin on the preamp board.
Is there any DCV on the SG (signal in?) pin of the driver board?
Place the black probe on the ground pin of the driver board.
Place the black probe on the ground pin of the driver board.
I have a donor amp,I swap the preamp board but no change.I am not sure if that board is functional just tried it.
Do you have the various supply voltages after you lose oscillation or does the power shut down as well?
Can you do the same with the sub driver board?
If you try that, see if the amp will remain on with no sub driver board.
Can you do the same with the sub driver board?
If you try that, see if the amp will remain on with no sub driver board.
The supply voltages mark on the sub driver board present.
The amp does not shutdown.It stays oscillating until I switch it off.
The sub driver board from the old amp look like work had been done on it but I will try it to see.
The amp does not shutdown.It stays oscillating until I switch it off.
The sub driver board from the old amp look like work had been done on it but I will try it to see.