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Nelson Pass F3 amplifier help wanted
Nelson Pass F3 amplifier help wanted
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Old 31st August 2017, 11:04 AM   #11
KatieandDad is offline KatieandDad  United Kingdom
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FIRST WATT F3
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Old 31st August 2017, 11:34 AM   #12
Gyuri is offline Gyuri  Hungary
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As far as I know, F3 and ZV9 almost the same.

Wanted: F3 pcb - anyone?
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Old 31st August 2017, 11:53 AM   #13
russell66 is offline russell66  Australia
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No way your a legend! I am in Perth, if I will be in Melbs in November but hopefully we can sort it before then. Ill upload the pictures and post them tonight. Thanks
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Old 1st September 2017, 05:33 AM   #14
russell66 is offline russell66  Australia
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Old 1st September 2017, 05:34 AM   #15
russell66 is offline russell66  Australia
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Its these 3 resistors that glow red and smoke. Click the image to open in full size.
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Old 1st September 2017, 05:40 AM   #16
russell66 is offline russell66  Australia
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In this picture you can see a previous repair on the left by a technician which seems to work ok. I'm not sure if he did anything else or if it changes the sound. On the right you can see I have replaced them with three new ones but the problem is still there.
Click the image to open in full size.
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Old 1st September 2017, 10:57 AM   #17
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by russell66 View Post
In this picture you can see a previous repair on the left by a technician which seems to work ok. I'm not sure if he did anything else or if it changes the sound. On the right you can see I have replaced them with three new ones but the problem is still there.
Click the image to open in full size.
Maybe your components on right side board make electrical short contact with the heat sink ? Blue square trimmer around run hot resistors viper position is ~ similar to trimmer on the left side ? Transistors N and P channel is in correct position if compare with the other working board ?
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Old 1st September 2017, 11:18 AM   #18
Soundhappy is offline Soundhappy  France
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Werify all wires if not wanted contacts maybe red and black have short or is separated correctly ?
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Old 1st September 2017, 01:05 PM   #19
Dennis Hui is online now Dennis Hui  Canada
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Nelson Pass F3 amplifier help wanted
Looks like there are no standoffs on the board and it doesn't look like much spacing
between the PCB and heatsink. Please check if something may have shorted from
behind the PCB.
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Old 1st September 2017, 04:59 PM   #20
Gyuri is offline Gyuri  Hungary
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Good point.
If I were you, I would break it apart and, after checking the parts, I would build it properly
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