Question about MTX Thunder 1501D Car Audio Amplifier

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Mta 1501d my mtx1501d put out dc at the speakers i replace the caps and transistors but still has the same problem. I opened the amp and tested the resistors at 245,246,247,249 and get a straight beep on the tester and the other gives me a clear reading. any ideas on what happen, can some test thoses resistors and tell me if the should be a reading or a straight beep on the continuity tester. i call mtx and they dont fix that model any more the guy told me its a 4.75 1/10 watts at 1% R245,246,247,249.So can ayone help; me with this.

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You need to switch your meter to ohms and measure the resistance across them. You should read something near 4.75 ohms.

4.75 ohms would cause a constant tone on diode check or continuity.

Did you replace all 8 output transistors?

If not, are you sure that the other 4 transistors haven't failed?

Posted on Apr 17, 2008

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To get the clamps off click HERE.

There may be several bad components. Normally, shorted outputs (the most likely cause of DC on the outputs) causes the amp to go into protect mode. In your amp, you may have shorted output transistors, open emitter resistors and possibly a problem with the protection circuit.

To get up to speed on the basics, read through the following page:

Amplifier Repair Primer

After you read through that page, remove the clamps and check all of the output transistors to determine if any are shorted.

Let me know what you find.

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MTX never released any of their schematics.

What sort of problem are you having with it?

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There are a lot of problems that can cause the amp to apply DC to the speaker terminals.

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You need to CAREFULLY measure the DC voltage from leg 1 to leg 3 of all of the output transistors (the ones you changed). Post a list of the voltages and circuit board designation (FETxyz) for any that read more than 1v.

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Remember... High voltage and lots of stored energy. Be careful.

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If it does it with no RCAs plugged in, the speakers or wiring need to be checked.

If the speakers and wiring are OK, the amp may have shorted output transistors.

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