ATN8 Channel 8 LED Issue

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toneburst
Ultra Wiggler
Posts: 856
Joined: Fri May 02, 2014 2:41 pm
Location: London

ATN8 Channel 8 LED Issue

Post by toneburst » Wed Jul 29, 2020 10:12 am

Just assembled my 2nd ATN8.

All seems ok except the LED for channel 8 is constantly lit.

The channel (and all others) appears otherwise to work fine.

In the absence of schematics, does anyone have any tips on where I should look for the cause of this behaviour?

toneburst
Ultra Wiggler
Posts: 856
Joined: Fri May 02, 2014 2:41 pm
Location: London

Re: ATN8 Channel 8 LED Issue

Post by toneburst » Wed Jul 29, 2020 10:35 am

I can't see any missing components around U8.

The opamp is correctly orientated.

I reflowed solder on U8. Looks OK through a loupe, and I can't see any shorts across pins or other obvious issues.

toneburst
Ultra Wiggler
Posts: 856
Joined: Fri May 02, 2014 2:41 pm
Location: London

Re: ATN8 Channel 8 LED Issue

Post by toneburst » Wed Jul 29, 2020 4:32 pm

Fixed! Desoldered and resoldered U8, and now all seems well.

Thanks guys!

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