Are the relays engaging/closing?
Do you see any DC voltage on the output filter inductors?
Is your scope set the AC coupling?
What make model scope?
Please (and this applies to anyone who needs repair help) use your sig line to list all equipment you have, editing it as equipment changes. Include the model numbers.
Oscilloscope (yes or no)
Multimeter(s)
Type of signal source (grounded RCA shields preferred).
Soldering iron
Desoldering pump
Power supply
2 ohm current limiting resistor (hollow cylindrical ceramic 100w preferred)
Do you see any DC voltage on the output filter inductors?
Is your scope set the AC coupling?
What make model scope?
Please (and this applies to anyone who needs repair help) use your sig line to list all equipment you have, editing it as equipment changes. Include the model numbers.
Oscilloscope (yes or no)
Multimeter(s)
Type of signal source (grounded RCA shields preferred).
Soldering iron
Desoldering pump
Power supply
2 ohm current limiting resistor (hollow cylindrical ceramic 100w preferred)
Yes the relays are opening and closing
Yes there is about -6vdc on both output inductors using the speaker negative as ground
Yes the scope is on ac
Yes there is about -6vdc on both output inductors using the speaker negative as ground
Yes the scope is on ac
I'm sorry, I misread. It generally is the secondary ground but there are exceptions. H-bridge output have output on both speaker terminals. A few amps (maybe a layout mistake) have the signal on the negative speaker terminal.
The DC is likely causing the amp to go into protect. The relay is likely closing and them immediately opening.
Is the protect LED lighting up?
The DC is likely causing the amp to go into protect. The relay is likely closing and them immediately opening.
Is the protect LED lighting up?
If I feed a sine wave into the amp and turn the gain up I can hear the amp start to buzz when it starts to clip but I dont see any waves anywhere.
If you can see it clipping, it has to have a drive signal.
Does the amp have 6v of DC across the load connected to the speaker terminals?
Does the amp have 6v of DC across the load connected to the speaker terminals?
Ok so I dont know for sure its clipping but it's the same sound I hear on other amps when u turn the gain up to far. This is without a load attached
With the amp at idle, do you have rail-rail oscillation?
With the amp on, at idle and a load connected, do you have any DC voltage across the speaker terminals?
If not at first, drive a signal into the amp for a second to see if that will trigger oscillation.
With the amp on, at idle and a load connected, do you have any DC voltage across the speaker terminals?
If not at first, drive a signal into the amp for a second to see if that will trigger oscillation.
What's the DC voltage on pin 2 of the 21844s when you lose signal on terminal 1? Black probe on the negative rail.
Do you still have signal on the output of the TL072 and the LM211 on the driver board when you lose signal on the 21844?
Is the photo the current condition of the amp (only one FET per bank, 4 total)?
Do you still have signal on the output of the TL072 and the LM211 on the driver board when you lose signal on the 21844?
Is the photo the current condition of the amp (only one FET per bank, 4 total)?