Ring testing is fairly effective for a SMPS TX, and will show if it's got shorted turns - such failures are usually fairly serious . I've repaired thousands of switchmode PSU's over the decades, and to be fair TX failures are pretty rare, there was only a small number of particular types which ever failed.
Ring testing is fairly effective for a SMPS TX, and will show if it's got shorted turns - such failures are usually fairly serious . I've repaired thousands of switchmode PSU's over the decades, and to be fair TX failures are pretty rare, there was only a small number of particular types which ever failed.
I get to repair some smps welders .
The problem is sometimes i cant find any problem on them so am left with the assumption of having a transformer problem.
I will unsolder one and upload it here this tranformer is switched using a viper20a smps Ic.
Now about the ring tester , does it test all types of smps transformers ?
Ring testing should work for any reasonable inductor, obviously the best thing to do is test a good one, and make a record of the result - then compare it to any potentially faulty ones later.
You don't seem to understand what 'ring' means?, it's like striking a bell making it 'ring' - in the same way you apply a brief pulse to an inductor and watch the 'ring' on the scope. Historically it was done using the timebase output of the scope to create the pulse.
Ring testing should work for any reasonable inductor, obviously the best thing to do is test a good one, and make a record of the result - then compare it to any potentially faulty ones later.
A smps weld set, powered by a viper?, such Ic's were meant for standby supplies in consumer equipment.
Do you mean an inverter weld set with a auxilliary supply controlled by the viper chip.
I wouldnt be over concerned with the Q, an insulation test and a inductance test will give you a good idea on the trans.
Dont do an insulation test in circuit.
A smps weld set, powered by a viper?, such Ic's were meant for standby supplies in consumer equipment.
Do you mean an inverter weld set with a auxilliary supply controlled by the viper chip.
I wouldnt be over concerned with the Q, an insulation test and a inductance test will give you a good idea on the trans.
Dont do an insulation test in circuit.
Its more than likely something has caused a fault in the Viper 20 chip than the transformer. Sugest you look up the data sheet on that chip. Also a picture of the actual circuit board would be of some help when asking people for help. Otherwise its all guess work.
I suspect the burnt out resistor is the startup resistor, usually a few 100 k to 1 meg or so.
Could be because something else has failed & is preventing the supply from starting up.
I suspect the burnt out resistor is the startup resistor, usually a few 100 k to 1 meg or so.
Could be because something else has failed & is preventing the supply from starting up.
I have a similar pcb to copy the resistors values from even though not exactly the same layout , but i have a feeling they will boot the system up , had the same issue with a chinese one.