MTX 405 Amplifier Smoking! Help - Page 2

johnkean · 14th November 2009, 09:50 PM

Thanks for all the input and help. 4 of the 6 caps, 47uf 50volt were all blown. I removed all 6 and cleaned up the mounting holes with desolding braid. I found 5 47uf 50 volt caps and that was all they had, so I bought one 47uf 63 volt and installed them on the board. Do you think the 63 volt cap will cause any trouble? Hooked it backup in the car with the cover off so I could watch the board to see if I was going to have any more trouble and it is working great without any smoking now. That coil seems to be working fine without any shorting so I am gonig to leave that alone. Thanks again for the help.

Perry Babin · 15th November 2009, 06:15 PM

It would have been better to have the caps matched but if they're the same value, it probably won't cause any problems.

Sometimes, the inductor only shorts after the cover is reinstalled and pressure is applied. It's possible that, if it was shorted, you moved it enough so that the bare points on the windings won't match up again. If it blows the caps again, you'll need to check the inductor and insert an insulator between the windings.

1moreamp · 15th November 2009, 06:16 PM

Cool! glad to hear its working out for you.

Perry your correct I was thinking of the another older silver 705 model...So many amps over so long of time lol sometimes it runs together upstairs lol lol THX Perry

15th November 2009, 06:15 PM	#12
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It would have been better to have the caps matched but if they're the same value, it probably won't cause any problems. Sometimes, the inductor only shorts after the cover is reinstalled and pressure is applied. It's possible that, if it was shorted, you moved it enough so that the bare points on the windings won't match up again. If it blows the caps again, you'll need to check the inductor and insert an insulator between the windings. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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14th November 2009, 09:50 PM	#11
johnkean diyAudio Member Join Date: Nov 2009	Thanks for all the input and help. 4 of the 6 caps, 47uf 50volt were all blown. I removed all 6 and cleaned up the mounting holes with desolding braid. I found 5 47uf 50 volt caps and that was all they had, so I bought one 47uf 63 volt and installed them on the board. Do you think the 63 volt cap will cause any trouble? Hooked it backup in the car with the cover off so I could watch the board to see if I was going to have any more trouble and it is working great without any smoking now. That coil seems to be working fine without any shorting so I am gonig to leave that alone. Thanks again for the help.

15th November 2009, 06:16 PM	#13
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	Cool! glad to hear its working out for you. Perry your correct I was thinking of the another older silver 705 model...So many amps over so long of time lol sometimes it runs together upstairs lol lol THX Perry

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