thanks a lot! didn't realize the ARP's completely isolated from the
program board! that makes it much easier to figure out :)
i wish i had decent service manual scans, i wonder why there aren't
any on the web.
about desoldering ICs - i manage to suck all the solder out of the
holes, but some pins still "stick" a bit to the pcb, with 10 pins it's
still possible to remove without serious damage, but with 40 pins...
i'll see how much the DIL desoldering tips cost, but i'm afraid
they're too much :)
thanks again for the insight!
jure
On 9/2/07, Johannes Hausensteiner <johau@gmx.net> wrote:
> Hi,
>
> > 1. are ∗all∗ the electrolites worth replacing?
> No, only those which are getting warm. Which ones are they? Usually
> those in power supplies. The more current, the more heat. The higher
> frequency the more heat.
>
> > 2. how on earth do you unsolder the main cpu socket (40pin i think)
> > without destroying all the vias? every IC i've unsoldered so far was a
> > tough job, unless i could clip the pins off.
> Either you have a (good quality) desoldering tool: solder iron with
> integrated vacuum sucker.
> Or you have a desoldering "tip" for you soldering iron: this has the
> size of the socket you want to desolder (DIL14, DIL16, DIL40, etc.). It
> melts ALL pins of the IC / IC socket at once.
> Or destroy the socket/IC and desolder each pin seperately.
>
> > 3. how do i go about with my apeggiator problem? where should i look?
> > just replace everything in its LED's path?
> The ARP has a separate oscillator, built around the 555 (KLM-371/IC1).
> Check the circuit of the 555. Download a data sheet from:
> http://www.ortodoxism.ro/datasheets/philips/NE_SA_SE555_C_2.pdf
> and read how it works.
>
> > 4. what wire should i use for repairing the traces? i want it to be
> > really thin and isolated.
> Take a wire used for "wire wrap" method. Take the thinnest you can get,
> e.g. 0.05mm2. Or take laquer (?) isolated wire like it is used inside
> transformers.
>
> > 5. what do you recommend for cleaning the board? acetone? alcohol?
> Alcohol. Acetone is too aggressive, it desolves the solder mask.
>
> Good luck!
>
> Johannes
>
>
> jure zitnik wrote:
> > hi guys, hi again.
> > a have a story and a few questions.
> >
> > a good year ago i bought a battery-leaked polysix and went through 2
> > synth repair services, just to end up fixing it myself. nobody could
> > fix it, after a month of being repaired troubles were still there. so
> > i opened it up, made the battery mod, located the few bad traces,
> > replaced 2 ICs and rewired the traces. and wow, it worked. it all
> > woked except for arpeggiator LED. it was always on. and a few bank and
> > patch LEDs were acting a bit funny too, but nothing serious.
> >
> > yesterday i found out the subosc switch doesn't work. i knew soon
> > after "repairing" the synth that the battery corrosion will continue
> > to eat up traces, i should have removed all the damaged ones. so i
> > opened up the beast, print out all the schematics i have and got to
> > work.
> >
> > after inspecting the schematics (and with the knowledge i acquired
> > since the last time) i found out that the arpeggio switch isn't even
> > connected to the programmer board (367).
> >
> > so... the questions:
> >
> > 1. are ∗all∗ the electrolites worth replacing?
> > 2. how on earth do you unsolder the main cpu socket (40pin i think)
> > without destroying all the vias? every IC i've unsoldered so far was a
> > tough job, unless i could clip the pins off.
> > 3. how do i go about with my apeggiator problem? where should i look?
> > just replace everything in its LED's path?
> > 4. what wire should i use for repairing the traces? i want it to be
> > really thin and isolated.
> > 5. what do you recommend for cleaning the board? acetone? alcohol?
> >
> > please guys, help me. i want to do this once and for all. it's my
> > favorite synth and i WILL make it work!
> >
> > cheers,
> > jure
> >
> >
> > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>