Blown power supply transistors in punch 225.2 - diyAudio
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Old 26th January 2010, 12:22 AM   #1
chipper is offline chipper  United States
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Default Blown power supply transistors in punch 225.2

Yeah I just bought one from eBay used stating it didn't work so I kind of was expecting something wrong. What FETs could I use for a sub? I would like to get this to work because it looks like it would put out some power. One of the power supply fets is toasted pretty bad but the others look okay. But I know those are shoot out.
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Old 26th January 2010, 12:27 AM   #2
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I'd suggest using IRFZ44s.

Don't forget to check the gate resistors and the driver transistors.
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Old 26th January 2010, 01:17 AM   #3
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Quote:
Originally Posted by Perry Babin View Post
I'd suggest using IRFZ44s.

Don't forget to check the gate resistors and the driver transistors.
can you post a photo of where I can on a 225? I also need another torch to remove the fets. Where can I get that from? What type of solder do I use?
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Old 26th January 2010, 01:45 AM   #4
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Read the following post (#29). It tells how to replace transistors on a similar insulator strip.
t30001bd schematics

The gate resistors are R19, R20, R36 and R46. The driver transistors are Q1, Q2, Q4 and Q5. It may be easier (instead of checking the transistors) to simply measure the voltage on the gate pads (solder pad for leg 1 of the FETs) of the FETs (after confirming that the gate resistors are within tolerance - 5% of marked value).

Use standard solder.
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Old 26th January 2010, 03:15 AM   #5
chipper is offline chipper  United States
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Quote:
Originally Posted by Perry Babin View Post
Read the following post (#29). It tells how to replace transistors on a similar insulator strip.
t30001bd schematics

The gate resistors are R19, R20, R36 and R46. The driver transistors are Q1, Q2, Q4 and Q5. It may be easier (instead of checking the transistors) to simply measure the voltage on the gate pads (solder pad for leg 1 of the FETs) of the FETs (after confirming that the gate resistors are within tolerance - 5% of marked value).

Use standard solder.
Yeah I can get them off
I'm also curious do I get four irfz44's?
And do i check it power to the amp and rem voltage applied?
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Old 26th January 2010, 03:38 AM   #6
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Yes. Four Z44s.

Yes. With B+ and remote voltage applied (although B+ voltage isn't necessary on this amp).
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Old 26th January 2010, 03:49 AM   #7
chipper is offline chipper  United States
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Quote:
Originally Posted by Perry Babin View Post
Yes. Four Z44s.

Yes. With B+ and remote voltage applied (although B+ voltage isn't necessary on this amp).
I measured 36.4 ohms for the gate resistors is that correct?
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Old 26th January 2010, 04:25 AM   #8
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What are the numbers printed on the resistors?

If you haven't done so, cut the first leg of the blown power supply FETs so that they can't skew the readings.
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Old 28th January 2010, 06:10 AM   #9
chipper is offline chipper  United States
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Quote:
Originally Posted by Perry Babin View Post
What are the numbers printed on the resistors?

If you haven't done so, cut the first leg of the blown power supply FETs so that they can't skew the readings.
I torched them out of the mesha strip now how would I be able to resolder them back on? What if I tin the mesha strip with some solder?
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Old 28th January 2010, 06:25 AM   #10
chipper is offline chipper  United States
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Quote:
Originally Posted by Perry Babin View Post
Yes. Four Z44s.

Yes. With B+ and remote voltage applied (although B+ voltage isn't necessary on this amp).
Oh yeah can you please send me a link to where I can find the irfz44s?
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