Question about MTX Thunder 6500D Car Audio Amplifier
I blew my amp last week. (short circuit on the output speaker :S) I see that the four 75339P were smoke. I changed all four with IRF3205 and now the amp doesn't want to turn on. (no sound and led doesn't power on) Do you have an idea if I have something else blew? I have also test DC voltage on each of the 16 pins of the TL494 when power is on. Here's the DC voltage of the TL494 PIN #1 : 0 PIN #2 : 0 PIN #3 : 0.06v PIN #4 : 1.15v PIN #5 : 0 PIN #6 : 0 PIN #7 : 0 PIN #8 : 11.5v PIN #9 : 0 PIN #10 : 0 PIN #11 : 11.5v PIN #12 : 11.6v PIN #13 : 5v PIN #14 : 5v PIN #15 : 5v PIN #16 : 0 I don't what to do now. Thanks for your help! Dominique
SOURCE: mtx81000d 3rd chance
The original output transistors (SSP45N20A - if I'm not mistaken) for this amplifier are very difficult to find and there are virtually no substitutes that will work without extensive modification. Many techs try to use the SSP45N20B but they don't work reliably.
If you do find replacements, expect to pay $15 or more each. It's possible that there are other problems also. For example, the over-current protection may not be working properly. When it's working properly, it will generally trip when the output transistors fail (which prevents damage to the subs).
This is an old design. The newer amps will be more reliable and will generally offer better protection for the speakers.
Posted on Nov 19, 2007
make sure the power wire and the remote wire have voltage. at least 12 volts. make sure the ground wire is good and has a good solid ground. after that make sure the rca cables are getting signal from the radio. if you have a small speaker or tweeter you can touch the wires from the speaker to the rca cables and it should play music very quietly. meter the subs and make sure theyre ok and not shorted or bad. if all that checks out good.... the amp is probably bad. start with all the simple stuff and work youre way up. if the amp has good power and signal and good speakers then the only thing thats left is the amp. good luck
Posted on Dec 30, 2009
One of my friends had a amp like that , i looked at it an the inside of speaker box wires was touching , if thats not it then check ur power an ground , power wire must be the same size ground an if ur ground is not grounded good then u will get the cuting out .
Posted on Jun 11, 2011
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