Got a bit of a problem that popped up with my XL. Suddenly, many of my patches, including the “Init Parameters” preset, are lacking the dual filter. On these patch presets, there is now only one filter, and the spacing knob has no effect. I toggled through the presets and found some patches that do still have the dual filter, and on these the spacing knob works as expected. Seems like a firmware issue maybe? Any ideas?
Sorry I haven’t been contributing to the forums for a while. Things have been busy lately! Been enjoying reading along though: )
Some of the patches that still work might have the filter mode set to highpass/lowpass, and the high pass might still work while the second low pass is probably defective, as Rudi suspects.
I actually just checked the poles right before discovering your reply. sure enough, the 4 pole filter on filter B is broken. 1 to 3 poles works fine, and the all the poles work on filter A. The 4 pole filter is dead on filter B though.
I’m bummed that this is a holiday, and Moog is closed. I’m hoping they open back up tomorrow. I hope that this is a fixable problem. . . Switched On, here in austin, has repair guys, and I am out of warranty. Do you think it would be a good idea to just take it to them? I’ll wait to get a response from Perry, but shipping the XL is not something I am thrilled to do.
Moog Music will most probably suggest you bring it to a certified/authorized Moog repair center. Let’s hope Switched On is one of them… Good luck and keep us posted.
Thanks, Rudi. Switched on is not an authorized moog repair center, though they have lots of experience fixing moog stuff (I know they’ve restored a few polymoogs very nicely). So, if I tell them to do this replacement, it should be fine, right? I’m out of warranty, so if I can get it done here, I definitely will. Still waiting to hear back from Perry. I think he’s out for the weekend.
I have the EXACT same problem with my Voyager RME - the filter B 4-pole has ceased to function.
Naturally it’s out of warranty so I’ll have to pay good money to correct what’s clearly a design fault with this component.
Rudi, anyone, can you tell me if it’s the same part number which needs replacing in a Voyager RME, and what would be a fair price for the repair in the UK?
Hi do you fixed? i’m having similar problem, channel right output is dead, even with headphones, and if i switch filter in hipass lowpass doesn’t sound, filterspacing doesn’t work as well…i haven’t checked filter poles yet… Which ic’s do you substitute?
As far as I know, Rudi’s reply was based on our basic diagnostics - that is, we were able to narrow it down to a specific faulty IC because our filters were not functioning in 4-pole mode on the left or right in dual lowpass mode. So I think you will have to try changing the filter pole settings if you want to locate the nasty chip.
If you have the same problem then the good news is that the replacement IC is really affordable.
I am experiencing the same problem. Both of my filters work from 1 to 3 poles, however, once in 4 pole mode both left and right signal is extremely attenuated and noisy. I am sure that I can handle replacing an IC chip, did the above advice fix the issue? I would consider sending my XL to NC, however, I have contacted Moog service twice and have been totally ignored.
The above IC was to replace a demultiplexer. This is basically a chip which takes in two inputs (which essentially holds a 2-bit number in binary, so 0-3) and has four outputs. Whatever number is on in the inputs makes that output turn on, whilst the other three outputs turn off. So if the inputs are 0 and 1, this refers to the number 1 in binary, and so output #1 turns on whilst outputs #0,#2,#3 turns off. Whilst is the inputs were 1 and 1, this refers to the number 3 in binary and so output #3 turns on, and so on.
This is probably used in the voyager to get which pole to use for a filter. The processor uses the two bit binary number since it saves bus lines; and this demultiplexer then turns a particular line on which then selects which poles to use. If this chip is faulty it could cause none of the lines to turn on if #3 is on which would mean when you select four poles you get silence.
However… that would be an all or nothing kind of thing. If you are getting noise, that could be something in the filter being off. Possibly the capacitor for the fourth pole. The multiplexer could still be broken if it’s broken state is for that fourth line to flicker on and off, though I’ve no idea of the likelihood of that.
The best thing is to follow Andy’s advice and contact them. They should be able to sort you out.
