Sundown Salt 8 is it repairable?

[chipper]

I just picked up a sundown salt 8 for dirt cheap since it doesn’t work. Has blown power supply from what I can see. Now where can I start at on this amp to get it to power up again while diagnosing the power supply? Where is the drive ic or transistors located on this amp?

 

[Perry Babin]

If it's like the rest of the clones, the driver IC is on the vertical driver board.

Check the outputs before you spend any time troubleshooting the PS.

 

[chipper]

thanks and for the output side are the drivers the parts that are defaced? There’s four. And how would you troubleshoot that?

 

[Perry Babin]

What's the part number on the driver board?

The defaced driver ICs are likely the IRS21844S.

Did any outputs fail?

 

[chipper]

Yes appears 6 are shorted they’re fda24n40f. Is this what you mean?

 

[chipper]

This area?

 

[Perry Babin]

That's what I meant about shorted outputs.

That's a different driver board than I expected. The driver IC is an IR2184. The other defaced IC is an LM211.

The standing 5-pin ICs are drivers. They will also need to be checked.

 

[cajones65]

If the output FETs were shorted, the drivers were probably hit. I believe them to be :MIC4452ZTs.

 

[chipper]

What are the drivers for the power supply? Part number

 

[Perry Babin]

Are they missing?

 

[chipper]

No just a little harder to locate online. Can I use bd139 & bd140 as a substitute?

 

[chipper]

Also are

IRFP7530 originals?​

 

[Perry Babin]

Those are generally OK for PS drivers.

I don't know if those are the original PS FETs. Do the solder connections look flow soldered?

 

[chipper]

Also what are the gate resistor values for power supply?

 

[chipper]

Actually yes they do. It had an amp lab repair sticker on the bottom so was previously repaired

 

[Perry Babin]

I don't have the diagram for that exact amp but on the generic diagram I have, they have 22 ohm gate resistors. Did all of them burn beyond recognition?

Flow soldering typically means that the parts are factory originals.

 

[chipper]

Would I also need to replace ka7500c?

 

[Perry Babin]

Not generally.

Do you have a scope?