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2020audio 1st June 2007 03:10 AM

mtx pro752
is anyone familiar with the power supply of the mtx pro752. have been unable to locate schematics. the problem is a short across the supply and ground. output trans look good so i assume i blew one of the rectifiers and help would be great!

Perry Babin 1st June 2007 01:56 PM

Did you measure the resistance across the B+ and ground terminals and found that it was at or near zero ohms?

2020audio 3rd June 2007 05:57 AM

correct the resistance between battery input and ground input is 0 ohm, fuse on amp good and on led does not turn on.

Perry Babin 3rd June 2007 06:31 AM

Something is seriously wrong. If the amplifier has zero ohms across the B+ and ground and it's connected to a power source, the fuse should blow (unless your power supply has some sort of current limiter).

Generally, these are the causes of 0 ohms across the B+ and ground terminals:

Shorted 'reverse protection' (RP) diode across B+ and ground.

Shorted power supply FETs (generally show signs of damage).

Melted solder that bridged across the traces in the amp (rare but it happens).

Wires shorted between B+ and ground terminals. I've seen lots of cases where the terminals got hot and frayed wires were pressed into the melted plastic of the blocks. This is sometimes difficult to detect on blocks that are not in good condition.

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