Electribe EM-1 fried sot23-5 IC6

dolby* · Post by dolby* » Wed Jun 22, 2016 8:21 pm

Hi,first of all i want to say hello to all of the korg maniacs...

Please forgive me my english,but thats not my native language.

I've got an Korg Electribe EM-1 with fried IC6(the type/number is unreadable),can someone tell me what kind of voltage regulator is it?

voip · Post by **voip** » Wed Jun 22, 2016 8:52 pm

It's a CPH6302 FET.

.

dolby* · Post by dolby* » Wed Jun 22, 2016 9:21 pm

Thank you.
Is there a more common replacement for that FET,or can i modify the power section to use an e.g 7805 ??

thesigma · Post by **thesigma** » Wed Jun 22, 2016 9:30 pm

dolby* wrote:Thank you.
Is there a more common replacement for that FET,or can i modify the power section to use an e.g 7805 ??

Not looking at the schematic, But I'd say most likely not to replacing with a 7805, at least not without heavy modification. FET is used in a switching supply. 7805 is a linear regulator. it would not be a DROP IN replacement.

check ebay, all kind of parts from china there....

voip · Post by **voip** » Wed Jun 22, 2016 9:42 pm

A 7805 could be used, with suitable circuit modifications, provided it is mounted on an adequate heatsink. Consider also that using one would increase the load on the external power supply, because the original FET is being used as part of a switched mode regulator.

.

thesigma · Post by **thesigma** » Thu Jun 23, 2016 1:15 am

voip wrote:A 7805 could be used, with suitable circuit modifications, provided it is mounted on an adequate heatsink. Consider also that using one would increase the load on the external power supply, because the original FET is being used as part of a switched mode regulator.

.

Also be sure that it's a 5v line and not a 3.3V line

dolby* · Post by dolby* » Thu Jun 23, 2016 6:48 pm

Can anyone send me or post an high res image of the power section of corg electribe em-1?

thesigma · Post by **thesigma** » Fri Jun 24, 2016 2:57 am

Sorry I don't own one....

But there's a service manual with schematic here

http://bmamps.com/Schematics/Korg/Korg_ ... Manual.pdf

They're actually using a 7805 for the analog 5V, but only 100 mA, so it's not going to get too hot at that current. The digital section looks good for an Amp so if you used a 7805 it would run warm even with a heat sink, if there's room for a heat sink....and there's no airflow in there either. I'd try to find a suitable replacement felt.

dolby* · Post by dolby* » Fri Jun 24, 2016 7:53 am

...Sorry,i've made a mistake,the fried IC on my PCB is IC6 (S-8520)
The F3 look's good,but i'm almost sure that its gone for good too.
So,now i'm looking for two chips replacements
Comparing two datasheet's the CPH6302 and FDC658AP

Can i use a FDC658AP instead of CPH6302

thesigma · Post by **thesigma** » Sat Jun 25, 2016 4:26 am

The two are pin compatible with most lay similar ratings, but not identical. I'm not skilled enough with SMPS to say wether the differences would matter. I can find the original part on eBay, why not just try that? Otherwise, I'd be willing to try the substitute, it can't be that expensive.