Hello, everyone
Again, for here with this "beast" I just received today.
Well, when connected, these are your symptoms:
A speaker and an mp3 at the entrance with music, the sound produced by the speaker is very, very, low, (almost have to bring your ear to the speaker to hear the music ...)
Controls the level of gain and frequency do not work, but are rotated from side to side, produce no change ...
I measured voltages at various points, which in my opinion seems correct, except for the high voltages that I measured (with the negative probe of the multimeter connected to the amplifier negative) and the positive probe multimeter connected to-HV (red wire in amplifier) gives me: -63 volts, and then I connected the + HV (blue wire in amplifier) and gives me 54 volts.
Is it normal this voltage difference?
What do you think of all this?
Maybe this has nothing to do with the breakdown and not going in the right direction ...
Again, for here with this "beast" I just received today.
Well, when connected, these are your symptoms:
A speaker and an mp3 at the entrance with music, the sound produced by the speaker is very, very, low, (almost have to bring your ear to the speaker to hear the music ...)
Controls the level of gain and frequency do not work, but are rotated from side to side, produce no change ...
I measured voltages at various points, which in my opinion seems correct, except for the high voltages that I measured (with the negative probe of the multimeter connected to the amplifier negative) and the positive probe multimeter connected to-HV (red wire in amplifier) gives me: -63 volts, and then I connected the + HV (blue wire in amplifier) and gives me 54 volts.
Is it normal this voltage difference?
What do you think of all this?
Maybe this has nothing to do with the breakdown and not going in the right direction ...
Attachments
You measure the rail voltage across the large red and blue wires.
Did you try moving all of the switches through all of their ranges to see if the audio ever played through normally?
Did you try moving all of the switches through all of their ranges to see if the audio ever played through normally?
Accordingly, the high-voltage measured between the red and blue wires is 117.20 volts.
I moved all the controls, and the only one that moves the speaker cone strongly, is the switch, single, slave, master ....
Thanks, Perry.
I moved all the controls, and the only one that moves the speaker cone strongly, is the switch, single, slave, master ....
Thanks, Perry.
Check the output pins of all of the op-amps in the audio circuit. Do any have more than a fraction of a volt of DC on those pins?
Well, I'm back to try the amp, and seems to have been lucky, I moved the switch to one side to the other, and seemed to work well, that's it, I bought a dielectric spray, I sprayed the switch and , has begun to run smoothly!
My conclusion is that this amp has been some time without being used in any climatic zone, ill advised, I think, what do you think, Perry?
Also, for curiosity, I measured what you said in the op-amp, the closest to the input RCAs, and gave me their outputs, 0.61 volts, is this correct?
My conclusion is that this amp has been some time without being used in any climatic zone, ill advised, I think, what do you think, Perry?
Also, for curiosity, I measured what you said in the op-amp, the closest to the input RCAs, and gave me their outputs, 0.61 volts, is this correct?
Connect a jumper between the RCA shield and the main ground and re-check the voltage. Does it drop significantly from 0.61v?
Climatic zone?
Climatic zone?
Well, Perry, and I have the measures
I have checked all of the op-amp audio board, and all give me very low action (0.012 v 0.023 v ...) except these three:
U302
Pin 1: 0.019
pin 7: 0,145
U306
Pin 1: -4.46
pin 7: 4.50
U304
Pin 1: -4.68
pin 7: 5.58
All these measures made with the bridge, from the negative amp up the shield of the RCAs, as you have told me.
My climate zone is pretty dry, and I'm like 150 miles from the sea.
Are they correct these tensions?
I have checked all of the op-amp audio board, and all give me very low action (0.012 v 0.023 v ...) except these three:
U302
Pin 1: 0.019
pin 7: 0,145
U306
Pin 1: -4.46
pin 7: 4.50
U304
Pin 1: -4.68
pin 7: 5.58
All these measures made with the bridge, from the negative amp up the shield of the RCAs, as you have told me.
My climate zone is pretty dry, and I'm like 150 miles from the sea.
Are they correct these tensions?
Those are appear to be OK. 304 and 306 are used in the protection circuit, not the audio circuit.
Yes, it is true Perry, those last two are the protection circuit, I feel the error ..
Then, I will close the amp, and when I can, I will set it in the car.
Thanks for all Perry, again, a repair most accomplished, thanks to their collaboration and cooperation, to me, is the best, Perry.
Greetings!
Then, I will close the amp, and when I can, I will set it in the car.
Thanks for all Perry, again, a repair most accomplished, thanks to their collaboration and cooperation, to me, is the best, Perry.
Greetings!
I have a little doubt, that I have not mentioned, and although I have the amp in my garage, and I have not yet installed in the car, I wonder.
It's about the fans, in this kind of amplifiers, when do they connect? When do you turn on the amp? Or, once it is on, and reaches a certain degree of temperature?
Thanks again.
It's about the fans, in this kind of amplifiers, when do they connect? When do you turn on the amp? Or, once it is on, and reaches a certain degree of temperature?
Thanks again.
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