Xpantastic!

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]" <xpantastic@yahoogroups.com> 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