SE Electronics Z3300a

[micolas]

tell me : c-C3 the 47uF in in serie between 4,7KΩ and R7 ? because I got the same voltage on + and -

(-) of C3 must be connected to GND.
it's filtering and also it's a kind of load

 

[Emmathom]

ok, thank you micolas for your help and patience. I quit for today (enough for a saturday). I don't know what I will do now as we seem to have tried everything out...
tomorrow will be another day...
have a nice evening

 

[Emmathom]

(-) of C3 must be connected to GND.
it's filtering and also it'a a load
imperfect soldering

AHHH VOILA ! I think the 47uF rated at 35v (!!!) has blown away !!!!
We have got more than 40v here today...
I have soldered a thin metal stick upon the track to be sure it's connected : I send you a pict now

 

[micolas]

just remove C3 from the circuit, measure it and solder good one, well in place.

 

[Emmathom]

I don't know if you can see in this photo but there are actually two tracks connected to the capacitor which I "reinforced" with two resistor tails because the capacitor was moving a little... it must be said that this board is a little weak in places (for example the 1015 had a bad experience unsoldering-resoldering-desoldering-resoldering and the track is damaged > but it makes contact)

 

[micolas]

I don't know if you can see in this photo but there are actually two tracks connected to the capacitor which I "reinforced" with two resistor tails because the capacitor was moving a little... it must be said that this board is a little weak in places (for example the 1015 had a bad experience unsoldering-resoldering-desoldering-resoldering and the track is damaged > but it makes contact)

Very well!
so, did you solder the pin ( - ) of C3 to GND?
Did you replace C3 with a 50...63v one?

 

[Emmathom]

Very well!
so, did you solder the pin ( - ) of C3 to GND?

I soldered its pin "-" in the track where it should... I replace the 25v by a 35v to be "more confortable" so I just replaced it

 

[micolas]

I soldered its pin "-" in the track where it should... I replace the 25v by a 35v to be "more confortable" so I just replaced it

What 25v ?? More!!!
50...63v

 

[Emmathom]

What 25v ??

is the original circuit C3 is a 47uF 25v that I replaced by 47uF 35v

 

[micolas]

is the original circuit C3 is a 47uF 25v that I replaced by 47uF 35v

Not.
470uF 25v
Put one of 50v

 

[micolas]

Not.
470uF 25v
Put one of 50v

It is the most important voltage filter

 

[Emmathom]

Not.
470uF 25v
Put one of 50v

sorry : I have put 470uF 35v

 

[Emmathom]

It could be interesting to draw the audio board schematic one of these days... cause it's a mic good for tweak.
I'll try 50v if it fits in place...

 

[micolas]

sorry : I have put 470uF 35v

If the audio part does not work again, it does not consume, then the voltage will be higher than 35v

 

[Emmathom]

if C3 must be to ground (wich seems normal) R7 too because they are connected together by the "-" of the 470uF

 

[Emmathom]

Sorry Micolas but I've to go now : I have an appointment tonite...
I will be back on this pb of capacitor to ground tomorrow...
Have a nice evening & thank you very much

 

[micolas]

if C3 must be to ground (wich seems normal) R7 too because they are connected together by the "-" of the 470uF

Correct

 

[micolas]

Sorry Micolas but I've to go now : I have an appointment tonite...
I will be back on this pb of capacitor to ground tomorrow...
Have a nice evening & thank you very much

Merci,
Je vous souhaite une excellente soirée !

 

[Emmathom]

Hi Micolas, I've tried to retraced the audio circuit (see attached) let me know please if you see some mistakes.
I don't know the value of the 2 inductances L1 & L2 (can it be measured by DMM ? I don't think so...)
I'm about to rebuild from scratch this board on a bread-board so there will be no more doubt about soldering & tracks

 

[micolas]

Hi Micolas, I've tried to retraced the audio circuit (see attached) let me know please if you see some mistakes.
I don't know the value of the 2 inductances L1 & L2 (can it be measured by DMM ? I don't think so...)
I'm about to rebuild from scratch this board on a bread-board so there will be no more doubt about soldering & tracks

Hi!
L1=L2=47uH
(yellow purple black)
together with the 10nF capacitors (103) form a filter for high frequency interference rejection.