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publison infernal machine 90 Keyboard Synthesizers
Old 25th October 2014
  #31
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roginator's Avatar
 

IF somebody have display board without codes on ICs .. here are pictures with em !

so far I had 4 IM 90 … 3 had all codes on display PCB .. and one did not so I made list!
Attached Thumbnails
publison infernal machine 90-e204a-1.jpg   publison infernal machine 90-e204a-2.jpg   publison infernal machine 90-e204a-3.jpg   publison infernal machine 90-publison-e204a-..-ic-codes-.jpg   publison infernal machine 90-publison-e204a.jpg  

Old 25th October 2014
  #32
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nednerd's Avatar
 

Great, thanks a lot for sharing this!
Old 25th October 2014
  #33
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dfchandler's Avatar
 

Thanks for sharing Roginator!!!

Denny
Old 1st February 2015
  #34
Gear Maniac
 
Johanz's Avatar
 

Quote:
Originally Posted by roginator View Post

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another thing with IM 90 is FAN … I added Noctua SUPER silent fan it works super quiet now!

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Can you tell which Noctua Fan exactly? Does is need the same voltage?

Thanks
Old 4th July 2015
  #35
Gear Nut
 

We had an IM90 and still have a DHM 89 at the studio.
The IM90 is a pig to proram, but f*ck me when you get it right, it's outstanding. Insane modulation and mad weird ambience.

The DHM is an amazing delay/chorus/harmoniser that's up there with the best of them.
You can get the maddest weird elect dubbyness out of that machine. It's ridiculous on drums, or pitch shifted vocals. No joke machines
Old 18th June 2018
  #36
Here for the gear
Publison Infernal Machine IM-90 experience

First of all, this thread and a few others convinced me to try out and eventually acquire the Infernal Machine from a local seller who expressed that one of the two cards gave a distorted sound so he was selling it at less than half the price.

When I met the person in the studio and tried it out, it clearly showed that both cards inside worked fine but one output was distorted, like an overdriven sound, but the processing was good. Then I found the remote was also in the studio, so I asked if it came with it and he said 'yes'!

When I got home, I immediately opened it up, after reviewing the manuals and the remote arrangement. I found that there may have been a few chips not 100% properly seated, but the thing that stood out was one of the two trim pots of the input was higher set, so I adjusted it to the other and made sure that was the trim pot of the defective sound. Tried it out, and it worked like a charm on both cards, 100% !! This lasted a few days and then the distortion came back... I re-opened up the unit, and came back to the same area, and what fixes it (temporarily) is just squeezing the piggyback card, as it apparently helps seating an underlying chip.

Now this issue is clearly a simple one. Yet, I'm looking for a permanent fix to this one and I don't want to risk breaking a good working unit.

Any advice welcome!
Old 18th June 2018
  #37
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oldgearguy's Avatar
 

Easiest answer - send it to Publison for repair and calibration. One of my IM-90s had that same problem and they fixed it up perfect.

In other effects units with RAM chips, sometimes the problem is a bad RAM IC, but not always. Sometimes it is the converters or other chips. Without a real service manual and test procedures it is very difficult to completely diagnose a problem in the IM-90.
Old 20th June 2018
  #38
Here for the gear
Quote:
Originally Posted by oldgearguy View Post
Easiest answer - send it to Publison for repair and calibration. One of my IM-90s had that same problem and they fixed it up perfect.

In other effects units with RAM chips, sometimes the problem is a bad RAM IC, but not always. Sometimes it is the converters or other chips. Without a real service manual and test procedures it is very difficult to completely diagnose a problem in the IM-90.
I tend to be one of those that can fix electronic myself. Here, it seems to be just a loose part, a loose contact where the signal inputs to on the CPU main processing card (not the DSP cards). It is on the PCB that is piggy back to the CPU main card.

Sending this device to Publison will yeld a big sum of cash for no real benefit imho. The units is otherwise flawless.
Old 20th June 2018
  #39
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Quote:
Originally Posted by JacquesM View Post
I tend to be one of those that can fix electronic myself. Here, it seems to be just a loose part, a loose contact where the signal inputs to on the CPU main processing card (not the DSP cards). It is on the PCB that is piggy back to the CPU main card.

Sending this device to Publison will yeld a big sum of cash for no real benefit imho. The units is otherwise flawless.
Fair enough. I've been repairing/cleaning/calibrating all my own gear since the early 90's and yet I know when it's better to seek the expert for a particular problem. Given no schematics and sanded off ICs, I opted to send mine out to Publison.

Your post ended with
Quote:
Now this issue is clearly a simple one. Yet, I'm looking for a permanent fix to this one and I don't want to risk breaking a good working unit.

Any advice welcome!
and so I offered my best advice. Spending $500 or $600 to fix a $3000 unit seems prudent to me, but everyone's situation is different, so I can't say that's a universal answer.
Old 11th December 2018
  #40
Here for the gear
Heads up on how I fixed my IM90

Wow, this unit is a box of surprises... (!)

Anyhow he're a short list of super easy fixes. First I will list things that I haven't done. Some I might plan on doing and some I will just wait if eventually it call upon...

What I may need to do in the short term (as this unit is in studio recording sessions):
- Replace tantalum caps (did not make a list of components yet, but there seems to be a few :P

Longer term:
- replace ribbon leads, no need imho as the whole unit works fine
- recap PSU, again the whole unit works fine, why bother ? Boots up flawlessly

What I did (very little in fact):
1) Clean up the DAC / IO board and reseat all chips and DAC piggyback board A and B. I'd say that is a tricky endeavor but really all that is needed is a full on brush cleanup with deoxit, and make sure all the chips are getting the full contact. I Swapped A and B board after the cleanup and that resolved the channel A distortion.

2) Full on cleanup re-seat brushing of the remote control. This made it so that now I can easily use the remote and it doesn't go berzerk like it used to. The big issue here is some chips get bad contacts. It is evident if you place the remote say on one of your legs and you start pressing one each side, you will void the use of your remote quickly as it will just corrupt the data because of pin seating.... The long term solution to this one is install longer extensions to screw the back plate to avoid it from touching any chips; specially the remote's CPU ...

3) Clean up reseat chips and brush the IO board that hosts SMPTE and extensions. This did not have much of an effect on daily use.... I was expecting some results there for wacky front panel situations.

The the one and last issue I have left is the front panel sometimes goes crazy and types in number and changes menu by itself. This happens after a few hours of use. I believe the front panel needs a cleanup but the screws are with super tiny hex keys (!) If anyone could guide me on the precise tool I should use for those screws.

The biggest issue with the Publison I find is the amount of socketed chips make it so that every single units is prone to have one or multiple bad contacts on their chip. In fact, it is quite amazing that with the number of socketed chips on these machines, that they don't fail more often... If I had the patience, I would de-socket every chip in there, which would make it way more stable, specially the bloody remote control, so I could drop it on the floor and it would still work without having to open it just to reseat chips. Also that front panel is quite a burden with socketed chips for no good reason. Imagine if every synth had socketed chips, no one would use them on tour... Well, I don't think anyone would use a Publison anywhere else than in a studio, they are so fragile because of this huge drawback.

Actually, Ensoniq has a bunch of socketed chips on the ESQ1 and SQ80, and it is true these don't tour much XD
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