So when you asked me to check the ground to the non-bridged speaker terminal, are we talking the amps Main ground from where the power and remote are near or the - terminal of the speaker terminal? either way I see nothing at all.
The non-bridging speaker terminals are the speaker terminals NOT used when bridging the amp. Half will be positive and half will be negative.
Confirm that you read 0 ohms between all 4 non-bridging speaker terminals. If you do, I'd jump from one of those to the main (primary) ground terminal of the amp. Then connect the scope ground to the primary ground or one of the non-bridging terminals.
That grounding should eliminate the noise that you were seeing.
Do you see drive on the gates of the power supply FETs with the scope grounded as above?
Now, check for audio on an output transistor in multiple channels to see if the audio still drops out when loaded?
If it does, check to see if you lose drive in the power supply as well.
Confirm that you read 0 ohms between all 4 non-bridging speaker terminals. If you do, I'd jump from one of those to the main (primary) ground terminal of the amp. Then connect the scope ground to the primary ground or one of the non-bridging terminals.
That grounding should eliminate the noise that you were seeing.
Do you see drive on the gates of the power supply FETs with the scope grounded as above?
Now, check for audio on an output transistor in multiple channels to see if the audio still drops out when loaded?
If it does, check to see if you lose drive in the power supply as well.
The non-bridging speaker terminals are the speaker terminals NOT used when bridging the amp. Half will be positive and half will be negative.
Check
Yes, I see drive on the gates. Now when I hook up a speaker there's no loss, I see active signal on all four channels.
No loss from the power supply
Check
Yes, I see drive on the gates. Now when I hook up a speaker there's no loss, I see active signal on all four channels.
No loss from the power supply
So, you still have audio on the output transistors for the channel with the speaker but no sound?
It looked that way, however now my scope is stuck and will not boot up. Im dead in the water until I get a new one. Ill post back as soon as I get one. Ill be buying a quality made scope. Thanks again for all your help Perry!
High-current passes through the larger windings. It appears that the winding that goes to ground (on the small side) is for the shield ground on that unductor).
The 'transformer' is the round component with the green core.
The 'transformer' is the round component with the green core.
Ok, so I think I have the scope situation fixed. With the probe properly grounded as you suggested and set to DC, I have -29v on one side and +30v on the other side of the bjt gates, with nothing showing on the emitter or collector pins. The A1694 and C4467 left and right pins show nothing.
BJTs (bipolar transistors) have bases, not gates.
Re-check voltages. If the base legs (leg 1) have rail voltage, the emitter legs (leg 3) should have very nearly the same voltage.
The A1694 and C4467 left and right pins show nothing.
^^^ ? The left leg is the base. Please clarify.
Re-check voltages. If the base legs (leg 1) have rail voltage, the emitter legs (leg 3) should have very nearly the same voltage.
The A1694 and C4467 left and right pins show nothing.
^^^ ? The left leg is the base. Please clarify.
Ok, still learning. Leg 1 shows nothing, leg 2 shows 29v, leg 3 shows nothing. I double checked this. Scope is set to DC and X10 on the probe.
If you have rail voltage on the center terminal (collector), you should have positive rail voltage on the center terminal of the C4467 and negative rail voltage on the center terminal of the A1694. Did you lose negative rail voltage?
For all test points, give the exact reading from your meter with all 3 places to the right of the decimal, even if they're zeros.
For all test points, give the exact reading from your meter with all 3 places to the right of the decimal, even if they're zeros.
Ok with a signal going I see positive voltage on collector C4467 and negative on A1694. Without signal I see nothing.
That will require me using ac correct? Because you stated that we almost never use ac, I just want to make sure before I check it so I get the correct reading.