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PPI PC21400.2
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Old 12th November 2020, 05:34 PM   #21
Perry Babin is offline Perry Babin  United States
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I didn't see many of these but in the ones I saw, I remember having to replace the 4081s in them.
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Old 12th November 2020, 05:36 PM   #22
caraudioguy2100 is offline caraudioguy2100
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I replaced the 4081ís in the amp and same issue .

Wondering if they have a high failure rate like the 4080ís ?

Wondering if they get easily damaged when installing them
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Old 12th November 2020, 05:40 PM   #23
Perry Babin is offline Perry Babin  United States
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I don't think that they are likely to get damaged. The 4080s are generally always in sockets.

Do you have drive signals on all 4 inputs (2, 5, 6, 7) to the IC?
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Old 12th November 2020, 05:52 PM   #24
caraudioguy2100 is offline caraudioguy2100
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Here are the drive signals on pins2,5,6,7

Scope settings are 5us 5volts/div
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Old 12th November 2020, 06:07 PM   #25
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
Are all of the PS FETs in the circuit?
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Old 12th November 2020, 06:08 PM   #26
caraudioguy2100 is offline caraudioguy2100
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No
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Old 12th November 2020, 06:09 PM   #27
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
Are any FETs in the circuit?
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Old 12th November 2020, 06:12 PM   #28
caraudioguy2100 is offline caraudioguy2100
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No fets are in the 2 banks causing issues .

I will put a fet in the bank and take pics of the drive
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Old 12th November 2020, 06:16 PM   #29
caraudioguy2100 is offline caraudioguy2100
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With 1 fet in the bank this is what I get on pins 2,5,6,7 on both 4081ís
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File Type: jpg 80576A20-8C6D-4AE9-9A02-CF7B8E3D25A5.jpg (979.1 KB, 19 views)
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Old 13th November 2020, 01:21 AM   #30
Perry Babin is offline Perry Babin  United States
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The 12 FETs that you listed are in 4 different banks.
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