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Re: PSU Transformer

 

hello karl , very nice for support .. yu are electronician, musician ??


i learn electronics slowly , i'm musician, but i will learn your info with the schema for my theory practice ..

maestro Dirstein just repare my xpander , better with a pro .. even if it coast a price ..

xpander had some injurie from non specialist those last week ..
let's see if psu work in time , i'm very to get it back..

i have good schema for xpander with color if yu need ..

best vibes ian?




Le Jeudi 3 juillet 2014 19h10, "Karl Schmeer shire03@... [xpantastic]" <xpantastic@...> a ¨¦crit :


?
Hello Ian,
?
I have a different PSU in my M12. Aside from a buzzing transformer it works fine.
The following coments,?come from looking at the xpander schematics.
?
The?transformer may not be bad.
Checking if T1 is working should relativly?easy.?
?
To test the primary (input)?of the transformer:
Unplug the mains cord from the Xpander.
Place an Ohmeter across the mains input on the back panel with the power switch on.
You should get a high resistance reading but not an open circuit. If an open
circuit, the the primary (input) of the?transformer has burned open.?
?
Unsolder diodes D1 and D2?and remove them from the circuit.
this allows isolating the transformer output from the rest of the circuit
?
With power off:
Measure across outputs of the transformer (secondary)?with an Ohm-meter. If the reading is open, then the transformer is
dead. If good the transformer ohm reading should be a low value (something less than 10K ohms).
?
Best Regards
?
Karl
?
?
?
??
???
?
?


On Thursday, July 3, 2014 6:49 AM, "galawak@... [xpantastic]" wrote:


?
hello everybody,

I have a problem with PSU too since 4 weeks..?
2 technicians check it, replace resistor ( R17 was burn, R4), capacitor, transitor Q2,Q3 ..
order and change NE 5561 on U4, then mosfet get explosed (Q1) he change it ..?

one technician think transfo 8103 TI is not working ..
we search
incon company doesn't remember these transfo, i ask by mail .?
impossible to find these old transfo today.

What did you do carl ? ?yu build a new psu with modern power transfos for each voltage ..

the best?
ian- paris?
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