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-   -   MTX Thunder 8302 (http://www.diyaudio.com/forums/car-audio/230319-mtx-thunder-8302-a.html)

S Merlington 18th February 2013 10:37 PM

MTX Thunder 8302
 
Amp powers up but no output..

Amp produces + and -32 volts of rail and + - 15 volts of regulated voltage


Any ideas on where to start?

Perry Babin 18th February 2013 10:45 PM

Confirm that you have both positive and negative supply voltage on all of the op-amps. There are resistors in the supply lines that sometimes open.

S Merlington 18th February 2013 10:51 PM

I have + - 15 volts on all op-amps..

Perry Babin 18th February 2013 10:53 PM

Does operating all switches and pots through their entire range make a difference (absolutely no sound, not even static/noise being produced by the amp)?

S Merlington 18th February 2013 10:58 PM

I got the amp to produce some sound but very very low output..

Perry Babin 19th February 2013 07:26 AM

Drive a strong signal into the amp and see which op-amps have audio on their output pins and which don't.

S Merlington 23rd February 2013 08:14 PM

All of the NE5532 op-amps have signal on the output pins..

Both TL074's have signal on PINS 1,8,14 but the signal looks distorted..
there is no audio on pin 7

S Merlington 24th February 2013 01:17 AM

See post above any ideas?

Perry Babin 24th February 2013 01:25 AM

With the black probe on the emitter and the red probe on the base, what is the DC voltage on Q303?

S Merlington 24th February 2013 01:33 AM

0.60 volts


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