Hi all
I have a Wharfedale PRO PM 700
link
Its completely dead, i.e. power LED doesn't switch on, fan doesn't start up, niks nada.
I've debugged the power supply using this schematic:
power supply schematic
But I've also attached it for your convenience and you can see the power supply schematic on pg 6.
I was able to measure the 300V DC immediately before T5 and then nothing else. On examining the transformer it looks like it is definitely the culprit, as all the windings, primary and secondary, are measuring as a short.
My question is: How to I determine the specs of this transformer so as to replace it? The data sheet gives it this part number: 022-3000041188
and this value: SVP15/18
But I can't seem to find a part anywhere?
Please help?
I have a Wharfedale PRO PM 700
link
Its completely dead, i.e. power LED doesn't switch on, fan doesn't start up, niks nada.
I've debugged the power supply using this schematic:
power supply schematic
But I've also attached it for your convenience and you can see the power supply schematic on pg 6.
I was able to measure the 300V DC immediately before T5 and then nothing else. On examining the transformer it looks like it is definitely the culprit, as all the windings, primary and secondary, are measuring as a short.
My question is: How to I determine the specs of this transformer so as to replace it? The data sheet gives it this part number: 022-3000041188
and this value: SVP15/18
But I can't seem to find a part anywhere?
Please help?
Proceed with extreme caution. These will bite and there is enough stored energy to kill!
It is doubtful that the transformer is faulty. The primary resistance is very low due to the frequency that is used with the balanced FET chopper and high current.
I would check for the start up supply to the oscillator and see if there is any output from each channel to start with. If one of the secondary diodes has gone short circuit, it will shut down.
Unless you have a good understanding on how this type of power supply works, let a qualified engineer repair it for you as it is very hazardous.
It is doubtful that the transformer is faulty. The primary resistance is very low due to the frequency that is used with the balanced FET chopper and high current.
I would check for the start up supply to the oscillator and see if there is any output from each channel to start with. If one of the secondary diodes has gone short circuit, it will shut down.
Unless you have a good understanding on how this type of power supply works, let a qualified engineer repair it for you as it is very hazardous.
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