SergeModular

Had a similar problem once with a '80s vintage panel, where only one
of the two LEDs would light up in my PS12. Same situation - different
panel combinations would work, but never all at the same time. To
make a long story short, there are two reasons why this may be
happening:

1. Power consumption exceeds capacity of the PS4 (not all panels
consume the same amount and you may be exceeding the power
requirements of the PS4)

2. A rare electrical issue with the panel/module in question - and
those may be very hard to track.

The simplest solution was to isolate the problem panel by assigning a
dedicated PSU to it - in my situation I used a PS2 for said panel -
and then grounded both PS2 and PS12 together. Problem solved.

Re: your new modules, maybe the issue is that you are exceeding the
power specs of the power supply, in which case upgrading the PSU may
be your solution.


Cheers -- Bill
__________________________________________
Bill Sequeira, PHD

On Jun 3, 2009, at 10:01 PM, Bakis Sirros wrote:

>
> hello list,
>
> i have already emailed Rex and waiting for his replies about this
> problem of mine, but i thought i could ask here too, as there are
> some really good techs on this list that could also help me:
>
>
> 'i got the 'dual osc', 'stereo mixer' mboat today...
>
> after connecting it (together with two more mboats) to my ps4 and
> then i turned on the ps4, i saw that only the -12volts green leds
> were lighting in all my 3 mboats that were powered from the ps4!
>
> of course i got worried and turned the ps4 off.
> after various experiments with checking the internal psd of the new
> mboat i got today, i saw that the ps4 with the new mboat and one
> more mboat worked fine!
> but when i was connecting the third mboat then that wierd thing
> happened again! ( only the green -12 volts led lighting).
> so, i thought that maybe this specific combination of the three
> mboats did not wokred well with my ps4. (why?)
> so, i decided to take an mboat from the other mboats that were
> powered from the ps12 of mine. (FYI, i have 11 mboats/ older panels
> powered from a ps12)
>
> so, i changed this mboat removed it from the ps12 and put it in my
> ps4 psd.
> so, now my ps4 was powering three mboats and all worked fine!
>
> so, after connecting all grounds and putting all things together, i
> saw that the ps12 had the exact same symptom! (only the green leds
> lighting of the -12votls)!
>
> but, it gets more weird!
> after powering off the ps12 and the ps4, and then re powering them
> on everything worked fine!
>
> so, now i am in a state that sometimes i power on my serge (first
> the ps12 and then the ps4) and it works fine and sometimes i power
> the serge on and does this strange thing (of the -12votls working
> only!)
>
> i really do not know what to do because i want my big serge system
> to always work fine.
>
> i thought that this problem maybe has to do with the ground cables
> (that now i have many of!) but even when unplugging some of them,
> the same thing kept happening sometimes.
>
> it is really crazy... i do not know what to do...
>
> i checked the grounding of some of my power strips (i have a lot of
> them connected in a serial manner!!) and seems fine...
>
> please help anyone?
>
> all these started today, after adding the dual osc, stereo mixer
> mboat to my system. BUT, i do not think that it has any problem, as
> this mboat in its own works fine!
>
> any ideas?
>
> maybe my system is now TOO big and the grounding circuit acts
> wierd...?
>
> help please!
>
> what to check?
>
> many thanks in advance!
> best regards,
> Bakis.
>
>
> Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
> [Doepfer_a100] group owner
> www. parallel - worlds - music. com
> www. myspace. com/ parallelworldsmusic
> www. myspace. com/ interconnectedmusic
> www. myspace. com/ memorygeist
> www. DiN. org. uk
> www. musicamaximamagnetica. com
> www. shimarecords. co. uk
> www. rubberrecords. gr
> Athens - Greece
>
>
>
>
>
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>
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