Voyager 4-pole filter is toast

[Jason T]

I have discovered that my the 4 pole setting in my Filter bank A is dead.
Only the 4pole mode is dead though, 1-3 poles works fine.

Does anyone know where this component is on the board?

[thealien666]

Hello Jason and welcome.

The ladder filter, and the selection of its different poles, is performed by CMOS analog switches (controlled by digital signals coming from the digital board). Since the analog board inside a Voyager contains more than 800 parts, it's better to leave the repairs to a qualified/authorized Moog tech. Especially if your synth is still under warranty. But even if it's not, also.

Have you contacted Moog Music's service department ?

[Jason T]

UPDATE

With the help of Andy at Moog support I was able to identify the failed chip. Ordered the part from Digikey and the next morning had the new chip swapped in. Desoldering was a little tricky but the whole process took about an hour. Super happy with Moog support. This fix cost me .58 cents.

Btw, I think I had this for months without realizing it since I only really use the left mono output and it can hide this problem. The sound is just less full, since you're missing one filter channel. Especially if you only use a few patches like I do it can go unnoticed. I only discovered it by putting on headphones and cycling through all the filter poles.

[clusterflux81]

hi it was U51 4052? i have a similar problem, do you had right channel output and hipass mute as well?