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Question about blown capacitors (non audio related) - Page 4

post #46 of 48
11/28/10 at 2:35pm

Quote:
Originally Posted by BobSaysHi View Post

To me, it seems like that part has broken.

 

Since I can't get a specific part number, could I replace it with something close to the specs of the one already installed (not that I have any clue what the specs are)?

 

Or could I remove it temporarily and see if that fixes it?

 


My understanding is that the opto-isolator provides feedback that lets the primary side's PWM controller know what the voltage is on the secondary (lower voltage) side. If the voltage isn't at the target, the controller can change the frequency of the pulses into the transformer. The power supply won't operate without the opto-isolator.

 

These types of power supplies are relatively complicated to repair- if you replace some parts but miss a dead one, the power supply could self-destruct again. This page offers some background information and help.

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post #47 of 48
11/28/10 at 3:34pm

Yes, exactly right.
 

Quote:
Originally Posted by MCC View Post


Quote:
Originally Posted by BobSaysHi View Post

To me, it seems like that part has broken.

 

Since I can't get a specific part number, could I replace it with something close to the specs of the one already installed (not that I have any clue what the specs are)?

 

Or could I remove it temporarily and see if that fixes it?

 


My understanding is that the opto-isolator provides feedback that lets the primary side's PWM controller know what the voltage is on the secondary (lower voltage) side. If the voltage isn't at the target, the controller can change the frequency of the pulses into the transformer. The power supply won't operate without the opto-isolator.

 

These types of power supplies are relatively complicated to repair- if you replace some parts but miss a dead one, the power supply could self-destruct again. This page offers some background information and help.

Reply
post #48 of 48
11/30/10 at 12:44pm
Thread Starter 

If it seems like I've given up on this, it's because I have. I ordered a 28 inch monitor eek.gif on Black Friday, so I really, really don't have space for this on my desk.

 

 

Thanks anyway head-fi, I learned a lot from this little project.

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