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not figuring this one out

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lasergps

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I have 12 volts going to the power supply of my pioneer amplifier but no 15 volts or 35-37 volts, what the heck. I don't even know where the probable point is. When I should be getting voltage of 15, 35-37 I get 0 so there is a direct short to ground. No burnt or blown up components. It is a GM-X862 which I don't have the proper schematic on and am not finding the proper components on the one that I had which was close, but not close enough. It is for a gm-x942\742/

So any ideas on this one and where to check would be extremely appreciated and thanks a lot in advance for the help.
 
What signal are you inputing and how are you measuring the output signal?
 
I am not inputtin any signal currently I am just trying to measure source voltages and am finding that I get power to the amp, but something has failed causing the amplifier part to not function. I have the ability to input any signal up to 10mhz and an o-scope to view them on. But just measuring voltages with a DMM.
 
It is a 190W per channel stereo amp or 380W into a single 4 ohm speaker when it is bridged, with a 14.4V supply. The power is less with less voltage.

It uses a DC to DC voltage step-up circuit to make positive and negative 37VDC from the 13.8V car battery.

The DC to DC converter circuit has failed.
 
Got it

Ok, here is what I found out one of my ouput transistors shorted out (which I was able to get the right schematic for the amplifier I am working on that made troubleshooting a lot easier). Which in turn caused my DC/DC converter to fail. I will order failed components swap them out and post results.

Once again I thank all you for your assisstance, without this forum and you guys I would of probably ended up hand tracing my schematic to figure it out.
 
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