MG101FX schematics needed

[randylee]

Hello!

I'm fixing my MG100FX(not DFX), It seems that TR10 on power amp board is blown. But I could not find this transistor's number.
Is there any one have schematics or this transistor's number?
Please help me!

Thanks

[J M Fahey]

To start with *something* post a clean sharp well illuminated picture showing the power amp area, try to make transistor codes visible.

In principle , power amp should be quite similar, if not the same, as in other MG100 versions.

Part numbers might not match though, but that can be solved.

Anyway start by building a lamp bulb limiter, you'll need it for safe troubleshooting.

[Jazz P Bass]

Hello!

I'm fixing my MG100FX(not DFX), It seems that TR10 on power amp board is blown. But I could not find this transistor's number.
Is there any one have schematics or this transistor's number?
Please help me!

Thanks

Is it one of the output transistors? (bolted to the heatsink)

The 100FX schematic for whatever reason is not available.
The 100RCD may be the same.
http://music-electronics-forum.com/a...0rcd-schem.pdf

2sa1386 is Q10.

[randylee]

Please refer attached picture you can find TR10 with marking YV and CG

[Jazz P Bass]

What board is that?

And how do you know that the transistor is bad?

[doctor]

Transistor TR10 is the MMBTA92.

[Jazz P Bass]

Thankyou Doctor!

MMBTA92 is a high voltage PNP transistor.

MMBTA92.pdf

I do believe that the amp in question is a MG101CFX.

It was stated as such in the header but then 100FX was in the text.

[randylee]

Thank you for all!
Problem is solved.
Finally I found that D4 is brocken, I have replaced D4, then it works correctly.
I'll keep Q10 parts number for next time.

Thank you very much!