Hantarex mtc900e smoking.

[Oggyuk]

Hi me again, anybody know what would cause this to smoke.
Thanks

 

[Georgian2]

Hi me again, anybody know what would cause this to smoke.
Thanks

Overheating leads to smoking....


on other hantarex model, if the big ceramic resistor heats up, the flyback is dead.

 

[tb2000]

Bad lopt and/or shorted H.O.T.

 

[Oggyuk]

Got the H.O.T. out and it seems bad, will order another.
I'm going down a rabbit hole at the moment, one thing after another.

 

[Retroman839]

If it got really hot
Your flyback is probebly shorted internally ..

Mine did it on a cab and it was a lot of smoke ..

You would need a new flyback .

Maybe you can visually see a crack in the flyback or smell your flyback has burned up?


Replacing the Bu208a will just blow it again .

You need to find the underlying cause,

Ai says
Check the high-voltage polyester snubber/tuning capacitor sitting right next to TR15. If this cap drops in value or cracks open, it can no longer filter out the massive voltage spikes generated by the yoke and flyback, instantly punching a hole through your new BU208A transistor.

 

[Georgian2]

Ai says
Check the high-voltage polyester snubber/tuning capacitor sitting right next to TR15. If this cap drops in value or cracks open, it can no longer filter out the massive voltage spikes generated by the yoke and flyback, instantly punching a hole through your new BU208A transistor.

"Let me google that for you" is so yesterday technology. "Let me AI that for you" for the win.

(Sorry for off topic)

 

[Retroman839]

I was replacing hots from Fairchild
Importing Fairchild transistors from usa at £40 a pop ..
Just to blow them instantly on a pf
29”
That sucked.. I hope you can find the
Reason why you’re hot is blown.

I would check that snubber
And check flyback

Before fitting a new hot just for it to blow