The diyAudio Firstwatt F6

[labjr]

I did post some pics some post ago, nothing has changed, there is no sign of burning on components, also the psu cap seems new... It worked well for a week and then stopped.


-Alex
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Not likely to be problem with power supply cap.

 

[mc297]

Anyway, tomorrow when I will substitute the cap I'll post some pics and news...


-Alex
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[6L6]

I would like to see the AC wiring to the transformer, the bridges and wiring, as well as the wire color code of the transformer. 🙂

 

[mc297]

Okay, these are the requested pics.



-Alex
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[Zen Mod]

caps missing on PSU pcb due to troubleshooting , I hope ?

 

[mc297]

Ahah, yup! 🙂


-Alex
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[Zen Mod]

yup means yes ?

 

[Zen Mod]

btw. cap , you mentioned , is showing short on ohmmeter ?

 

[mc297]

I measured them again and there is no short[emoji15]
I don't know why when I detached them I saw a short...


-Alex
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[mc297]

The resistors are okay...


-Alex
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[Zen Mod]

in every case , after reassembling PSU , test it with bulb tester

 

[mc297]

Do you think I have to change the other 4 cap, still on psu board?


-Alex
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[palstanturhin]

Detach the bridgerectifier. Does the fuse blow now?

Reattach the bridgerectifier, but no cap bank. Fuse still holds?

Attach cap bank. Fuse blows?

 

[Zen Mod]

simple as that ;

with bulb tester , as already said

 

[mc297]

Detaching the bridge, no blow; reattached but no cap, no blow and the led on


-Alex
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[mc297]

Putting cap, no blow... Now I'm scraching...


-Alex
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[mc297]

Well, the channel incriminated is working! Now I'm scraching more and more!


-Alex
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[mc297]

There could be a random short due to some washer left under the pcb or something else.


-Alex
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[Zen Mod]

also - be sure that you tighten all mosfets equally ...... and well

 

[labjr]

Short of reversing polarity or some fluke Panasonic caps aren't gonna fail.