Ear834 clone power supply issue

[jan.didden]

I can't parse that, it is unclear what you were measuring.
You have two probes. Explain with each measurment the meter setting and where the probes are.

Example:
multimeter set to ohms
one probe to one wire at the mains plug
other probe to same wire at the board side
measure 0.4ohms
This wire is OK

Do the same with the other wire in the mains cord, not the earth safety wire for now.

Jan

 

[jan.didden]

If both wires check out OK, go to next step.
Connect the meter in setting VAC; one probe to one mains wire at the board side, other probe to other mains wire at board side.
Do not connect the mains wires yet to board or transformer, wires should hang free and not touch anything.
Plug in the mains and now you should read 230V or close at the meter.
Pull out the mains plug.

Now go figure out at which transformer terminals you are supposed to connect the mains.
Do you have a pic of that?

Jan

 

[Electronewbe]

Im lost because firstly u adivsed me to check the wites using continuity which is eactly what I did… i checked the line in against both of the red secondary winding and got infinitive i then checked against neutral and each red wire got infinitive. Ive not checked any against ohms.

 

[jan.didden]

Why you check mains wire to secondary?? There is no connection there. Of course you measure infinite.
Continuity is to check that the wires are not broken and that they get to the board not interrupted.
Then AC check is to see that 230VAC gets to the board.
Next will be check that if you connect mains to transformer primary, it remains at 230VAC (no short) and that the secondary gives what it is supposed to give.

BTW Continuity is checking the resistance of something using an ohms meter, to be sure the conductor is not broken somewhere.

Jan

 

[jan.didden]

I'm sorry but this gets too dangerous.
I don't believe you have a good overview of what you need to do and I don't want to be resposible if you electrocute yourself.
You should get help from a technical capable person and not muck around with this yourself.

Jan

 

[Electronewbe]

Ok just did another test i put the probes across the two red wires disconnected from the board thyre the ac secondaries and switched on the amp, i got 260 volts across it and no smoke.

 

[Electronewbe]

I di know what im doing ive built several amps, and done electronics when i was young. Dorget it ill solve it myself

 

[Electronewbe]

Would acutally help if you were more clearer in what you say which tbh is mot that clear

 

[astouffer]

Sounds like something has shorted and dragging down the transformer voltage. Maybe a diode?

 

[Electronewbe]

I tested the diodes using a hameg oscilisocpe in curve tracer mode and they showed ok any other thoughts