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pc7fan · 06-14-2020, 08:05 PM

I have an QW-MS605D (same basic circuit as the 3010D except for a few components) the IRF840s in mine failed while running a 200W load. While it failed, it took out Q4, Q5, Q6 and Q7 - as well as the gate resistors. They are 47 ohms as well. The KA7500 was unharmed, and used some salvaged 2SK2915s from an old Delta PSU instead of more IRF840s. It now can do its full 300W without the primary FETs failing.

06-14-2020, 08:05 PM	#22
pc7fan Badcaps Veteran Join Date: Aug 2013 City & State: Maritimes My Country: Canada Line Voltage: 250V Split-phased, 60 Hz I'm a: Hobbyist Tech Posts: 52	Re: QW-MS3010D 30V 10A Variable PSU Blown MOSFET I have an QW-MS605D (same basic circuit as the 3010D except for a few components) the IRF840s in mine failed while running a 200W load. While it failed, it took out Q4, Q5, Q6 and Q7 - as well as the gate resistors. They are 47 ohms as well. The KA7500 was unharmed, and used some salvaged 2SK2915s from an old Delta PSU instead of more IRF840s. It now can do its full 300W without the primary FETs failing.