FADERS MOVING

[Jondav1120]

Are you referring to the rail caps on the brainboard or fader banks?

I was referring to the rail caps on the fader banks. C1 and 2 on the picture I posted earlier, these look as if they are under the fader itself. Fader could need to be removed from the board to access these caps

[Carlo]

I see. I got your point.
Thanks

[Phil.c]

Usually other things also go wrong.

[Jondav1120]

OK, Just to clarify..... with the original fader board installed faders were moving across all banks (1-8, 9-16, 17-25), has replacing the board reduced this to just the three faders?

[Carlo]

No. The faders (actually some) of bank 9-16 exhibited noticable movement. However there was some slight movements on other faders on bank 1-8 and also 17 to 25.....but barely noticable. The problem was on fader bank 9-16. When i swapped the bank (9-16) with another one i had in store the problem in the movements was negligible but still there.

[Jondav1120]

Hi Carlo,

If the problem is across all fader boards, I would have a look at the 12volt power supply. This appears to feed the motor drive circuit and also provides the +5v reference for the automation circuitry through a 5v regulator on each fader board. Any slight variations in the 12volt supply would have the effect that you are describing. Might be a ribbon cable (most likely the one from the power board to the brain board), BFC, or power supply in the CPU.

Regards

John

[Phil.c]

I ribbon reseat is always the first thing to do, it usually does the trick

[Carlo]

Thanks to all

[Carlo]

Some updates....

I swapped my second d8b (d8b2) and connected it to the first CPU/PSU (CPU1) and the problem cropped up again. The first d8b (d8b1) works fine on the other CPU/PSU (CPU2) so the problem is not the d8b mixer but it seems to be isolated and tracked down to CPU1. What do you recommend? How shall i solve the problem?

Any help please?

Regards

Carlo

[Jondav1120]

Hi Carlo,

I'd check the 12v power supply in the PSU/CPU. I think someone (possibly Ralph) made a comment in a different thread about the need for this to be very stable, otherwise the faders will move with the voltage variations. Don't have mine open at the moment otherwise I'd post a picture of the easiest point to measure the voltage.

Regards

John