rev F noise on digital-only C7 - [two boards modded differently with C200 variation]

[rusefillc]

See white counter increases not with red line as expected

https://rusefi.com/online/view.php?msq=1416&dialog=triggerConfiguration cam uses C7

See also https://github.com/rusefi/alphax-4chan/issues/102

[Qwerty-OFF]

Отличия от обычного входа CAM:

• подтяжка настраиваемая;
• подтяжка выполнена к +5VAS (TLS115), а не +5VA как обычно.

Давай попробуем сделать обычную подтяжку, для этого нужно unsolder R44 and put 4.7 kOhm as in the picture

Next experiment with capacitor C200, now it's 1 nF, you can put 10 nF and see what happens.

[rusefillc]

@ElDominio I have mod instructions I need stuff to mod please :)

[rusefillc]

• on two boards: @Timbelom we have 5.6K through-hole resistors for sure, could be easier than 4.7K SMD but we can try 4.7K maybe 1206 mounted vertically and a small wire?

• let's make one board with C200 replaced, one without C200 replaced

https://rusefi.com/docs/ibom/alphax_4ch-f-ibom.html

[rusefillc]

[rusefillc]

Shipped https://tools.usps.com/go/TrackConfirmAction?tRef=fullpage&tLc=2&text28777=&tLabels=9405511206214955226959

@ElDominio two boards have a small difference on purpose, so those might behave differently. open question which one C7 would work better

[rusefillc]

@Qwerty-OFF we have positive test results! we need the mod on rev G. Looks like C200 part of the mod is not needed

https://github.com/rusefi/rusefi/issues/5211#issuecomment-1493075254

[Qwerty-OFF]

[rusefillc]

@andreika-git what are your thoughts? what change could have changed what why?

[andreika-git]

Desolder Q20?

[ElDominio]

@Qwerty-OFF question, would removing R44 and adding the 4.7k Resistor be an acceptable fix?

[Qwerty-OFF]

@ElDominio yes

[ElDominio]

But I also have to add a capacitor on D57 right?

[rusefillc]

D57

@ElDominio your comment seems to be first mentioning of D57 on this ticket? Please provide some context?

[ElDominio]

I am trying to mod a RevC to work with 4G63

https://github.com/rusefi/alphax-4chan/issues/102#issuecomment-1446834216

Shows a capactior added to D57, but D57 does not exist on revC. I'm trying to figure out an equivalent position to place said capacitor to see if I can make it work.