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Thread Tools |
22nd November 2020, 12:07 AM
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#91 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Not as far as I know but I've never needed to remove them for any testing.
If I had to keep them from overheating, I used something like the temporary heatsink in the photo below.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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22nd November 2020, 03:12 AM
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#92 |
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diyAudio Member
Join Date: Aug 2010
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Ok here is what I get for drive signal they locations are loaded with a 1000pf cap
First pic is Q1 2nd:Q2 3rd:Q7 4th:Q8 Scope is set up in differential mode
__________________
Multimeter:Klein Tools MM6000 Hakko FX-888D soldering station Hakko FR-300 desoldering gun dual channel oscilloscope 2 ohm 100 watt resistor Pyramid 40 amp power supply and a kenwood KDC-248U fornsiganl source . M02020 Testoscillator |
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22nd November 2020, 05:49 AM
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#93 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Do you get the same for Q63 and Q69 as you do for Q2 and Q8?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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22nd November 2020, 06:02 AM
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#94 |
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diyAudio Member
Join Date: Aug 2010
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Yes
__________________
Multimeter:Klein Tools MM6000 Hakko FX-888D soldering station Hakko FR-300 desoldering gun dual channel oscilloscope 2 ohm 100 watt resistor Pyramid 40 amp power supply and a kenwood KDC-248U fornsiganl source . M02020 Testoscillator |
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22nd November 2020, 06:07 AM
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#95 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Are both channels of your scope set precisely the same?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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22nd November 2020, 06:08 AM
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#96 |
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diyAudio Member
Join Date: Aug 2010
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Yes
__________________
Multimeter:Klein Tools MM6000 Hakko FX-888D soldering station Hakko FR-300 desoldering gun dual channel oscilloscope 2 ohm 100 watt resistor Pyramid 40 amp power supply and a kenwood KDC-248U fornsiganl source . M02020 Testoscillator |
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22nd November 2020, 06:16 AM
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#97 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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If all 4 of the high-side drives (unloaded) look like the low-side drives (the ones with higher amplitude), I'd think that they are OK. There's no way that you could have 4 drive circuits from 2 different ICs that have failed in precisely the same way.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version. |
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22nd November 2020, 07:52 AM
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#98 |
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diyAudio Member
Join Date: Aug 2010
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Put all the fets back in circuit along with the rectifiers and regulators .
I powered the amp up for a couple of secs out of the sink and tested for output everything seems fine right now . I’m gonna put it back in the heatsink and fully tested it . I will let you know how it goes
__________________
Multimeter:Klein Tools MM6000 Hakko FX-888D soldering station Hakko FR-300 desoldering gun dual channel oscilloscope 2 ohm 100 watt resistor Pyramid 40 amp power supply and a kenwood KDC-248U fornsiganl source . M02020 Testoscillator |
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22nd November 2020, 06:35 PM
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#99 |
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diyAudio Member
Join Date: Aug 2010
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Amp is finally done .
So wanna say thanks a ton for the help with this amp . I appreciate your help a lot !!
__________________
Multimeter:Klein Tools MM6000 Hakko FX-888D soldering station Hakko FR-300 desoldering gun dual channel oscilloscope 2 ohm 100 watt resistor Pyramid 40 amp power supply and a kenwood KDC-248U fornsiganl source . M02020 Testoscillator |
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