I hope you well, I am busy repairing a Sansui DVD. I have scanned all the components looking for bad components, but there is no bad components.
I have checked the safety components of the primary circuit of this DVD everything is ok. I took my multitester meter checking for output voltage.
I found that the output voltage has dropped down. I tried to directly replace capacitors, but there is no improvement.
I have tried to locate the fault. I found that the output voltage has dropped from the secondary output diode. It uses ultra - superfast rectifier (SFF1004G).
I could not replace this rectifier, because it is not available in the electronics shop. The only rectifier I can get is SFF1005G. I actually wanted to know that, can I replace SFF1004G with SFF1005G.
This diode has tested ok, now I am not sure whether it fails under operation.
Your help will be appreciated.
Hi Mr Magugu,
Usually all diodes used on secondary side are fast recovery diodes and therefore you can use (replace) with. Example the ones used to filter secondary sources.
You have said you tested the diode and you found it okay, therefore I advise you to trust your meter, that is the eyes of the technician.
Still at that you also said that the voltage is dropping immediately after the diode... Here is the catch... If the voltage drops after the diode means there is a shorted component on that line after the diode.
Just follow that line looking for any shorted components. The likely components to short are zener diodes, transistors, capacitors.
All the bestRegards Humphrey
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