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Old 20th January 2012, 07:26 PM   #21
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You didn't say what failed other than the power supply FETs. I don't generally recommend replacing parts blindly.
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Old 20th January 2012, 07:36 PM   #22
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I guess that was my point.. If I need to remove the parts any way to test them, I thought I would order replacement parts for the ones that are more likely to need replacing. More a matter of not having to place multiple orders for parts being that shipping is the biggest expense.

The next step in troubleshooting would be to replace what I know is broken, then try to power it up with limited current as to not blow it up again. That is the current plan.. If I can have the parts I need on hand, that will save time and money.
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Old 20th January 2012, 07:52 PM   #23
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You can check for shorted output transistors while they're in the board. You can replace them all if you'd like (even if none are shorted).

What is the value of the gate resistors? If they're 470 ohms, I'd order 100 ohm resistors in case you need to replace them (of the 470s don't control the gates of the FETs well enough).
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Old 20th January 2012, 08:18 PM   #24
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I checked the output transistors in circuit, and none seem to have a dead short. I could see the capacitors charge/discharge on the meter so I guess that is a good sign that they are OK.

Would you suggest I change the gate resistors even if I use the Z34 replacement part? If I am going to do that, I might as well go for the Z44, or even the Z46 or Z48? What is your opinion on that?

Currently the gate resistors are 680 Ohm. I measured one of them to confirm it was 680, and it was..
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Old 20th January 2012, 10:20 PM   #25
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I think the 680 ohm gate resistors are likely to cause problems, no matter what FET you use.
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Old 21st January 2012, 02:00 AM   #26
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I understand. What advantage, or improvement will the 100 Ohm resistors give me?

Any idea what wattage those are?

If I am changing the resistors anyway, what is my best option for replacement FET?

Thanks.
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Old 21st January 2012, 02:22 AM   #27
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The resistors are 1/4w.

100 ohm and IRFZ44s should work well.

If the resistor value is too high, it won't allow the drive circuit to properly control the FETs. This will lead to overheating and premature failure.
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Old 21st January 2012, 03:03 AM   #28
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ok. so the plan is to check all of the output transistors again, order some parts and see what happens.

Thanks!
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Old 8th March 2012, 03:38 PM   #29
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Put all the new parts in, and the magic smoke all came out already... <sigh>. Put it aside for a while out of frustration, but looking for any new advice..

Maybe it is worth while to just send it out for repair? Any place in NJ work on them?
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Old 14th March 2012, 08:44 PM   #30
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Anyone? I thought someone would be willing to take my money to fix this..
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