OK picked this amp today for $80 at a swap meet.. the Amp physically is like a 9/10... Ok here is the problem.. It does not turn on.. Power supply checks out ok. No big burns on the board.. The only thing that was wrong is C741 next to the tl494 daughter board exploded.. there is almost nothing left of it... I think that it is a 10uf 50V because the one next to is the same value.
Can anyone tell me where to go from here? Should I just replace the cap and try it?
Can anyone tell me where to go from here? Should I just replace the cap and try it?
Post the DC voltage on all 16 pins of the TL494. Place the black meter probe on chassis ground. Place the red meter probe on the point where you need to measure the voltage.
494
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
494
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
Do you have the voltage on pins 2 and 3 reversed?
Do you have positive and negative voltage on the rectifiers?
Do you have positive and negative 15v on the op-amps?
Do you get audio from any of the channels?
In the future, copy and paste the column of numbers I post. It will save time and if you have negative values, the colons are less confusing than the dashes.
Do you have positive and negative voltage on the rectifiers?
Do you have positive and negative 15v on the op-amps?
Do you get audio from any of the channels?
In the future, copy and paste the column of numbers I post. It will save time and if you have negative values, the colons are less confusing than the dashes.
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