Schematic For Marshall MG 250?

[jcollins]

I've got a Marshall MG 250 on my bench. Anyone got a schematic.

The repair tag says "Replace R107". R 107 is gone, two leads stick up out of
the circuit board.

Any help is very appreciated.

[Enzo]

R107 - 5w 0.1 ohm. if that is burnt up, then the power module associated wth it is probably as well.

The schematic is posted at www.ampix.org in the Enzo gallery.

[jcollins]

Enzo,

Once again, thanks for the schematic. Do you recommend just replacing the TDA7293 in that module or should I checking other things as well.

[Enzo]

I recommend finding out what is wrong. That resistor would have to have a reason to fail, and since it is in the return leg of the speaker, I can think of nothing that would cause such a failure other than DC on the output - which in this case means bad 7293. I mean, disconnect the speaker and see if there is DC there. Replace the resistor first.