Yahoo Groups archive
Thread
2011-01-26 by Alexis V. Rogers
I have a PolySix that suffered from battery leakage that I'm trying to bring back to life for a friend. This is the fourth or fifth P6 I've worked on in the past year. It had the least amount of battery damage but has taken the most work. Anyway, here are my unresolved issues. The Program 1 LED is always on, the VCA attenuator doesn't work, and neither does the Octave switch. Any help? Thanks, Alexis
2011-01-26 by Andrew Jury
Hi, Make sure line DO0 terminates at all the places on the schematic where it is supposed to (CN06, IC22, IC28, etc). The P1 LED will light on active low, so that suggests this line is disconnected! Also make sure the latch input to IC28 (P24, pin 5) is connected to the CPU. This track runs right underneath where the battery spill usually occurs. Let us all know how you get on. Cheers, Andy On 26/01/2011 05:19, "Alexis V. Rogers" <alexis.v.rogers@gmail.com> wrote: > > > > > > I have a PolySix that suffered from battery leakage that I'm trying to bring > back to life for a friend. This is the fourth or fifth P6 I've worked on in > the past year. It had the least amount of battery damage but has taken the > most work. > > Anyway, here are my unresolved issues. The Program 1 LED is always on, the VCA > attenuator doesn't work, and neither does the Octave switch. Any help? > > Thanks, > Alexis > > > > ] [Non-text portions of this message have been removed]
2011-01-27 by Alexis V. Rogers
Thanks Andy, I rechecked the connections and everything was good. The battery voltage was low, however, so I swapped in a new one. Now, the Octave switch and the Program 1 LED are back to normal. But, the VCA Attenuator is still not working. The switch tests good, and so do the diodes connected to it. I've also checked the verified the connections from DO3 to the KLM-367. Where should look next? -Alexis --- In PolySix@yahoogroups.com, Andrew Jury <andy@...> wrote:
> > Hi, > > Make sure line DO0 terminates at all the places on the schematic where it is > supposed to (CN06, IC22, IC28, etc). The P1 LED will light on active low, so > that suggests this line is disconnected! Also make sure the latch input to > IC28 (P24, pin 5) is connected to the CPU. This track runs right underneath > where the battery spill usually occurs. Let us all know how you get on. > > Cheers, > Andy > > > On 26/01/2011 05:19, "Alexis V. Rogers" <alexis.v.rogers@...> wrote: > > > > > > > > > > > > > I have a PolySix that suffered from battery leakage that I'm trying to bring > > back to life for a friend. This is the fourth or fifth P6 I've worked on in > > the past year. It had the least amount of battery damage but has taken the > > most work. > > > > Anyway, here are my unresolved issues. The Program 1 LED is always on, the VCA > > attenuator doesn't work, and neither does the Octave switch. Any help? > > > > Thanks, > > Alexis > > > > > > > > ] > > > > [Non-text portions of this message have been removed] >
2011-01-27 by Malte Rogacki
At 2:02 Uhr +0000 27.01.2011, Alexis V. Rogers wrote: > I rechecked the connections and everything was good. The battery voltage was > low, however, so I swapped in a new one. Now, the Octave switch and the > Program 1 LED are back to normal. But, the VCA Attenuator is still not > working. The switch tests good, and so do the diodes connected to it. I've > also checked the verified the connections from DO3 to the KLM-367. Do you have continuity of D03 from the switch through KLM-369 to KLM-367? I just had a Polysix with a non-working EG mode switch and a problematic attenuator; turned out that a trace on KLM-369 (the left board) was broken (in my case P10 was the culprit). Both KLM-370 and 369 can be affected by battery leakage.
2011-01-29 by Alexis V. Rogers
Yes, I do have continuity on DO3 from the switch to all points. --- In PolySix@yahoogroups.com, Malte Rogacki <gacki@...> wrote:
> > At 2:02 Uhr +0000 27.01.2011, Alexis V. Rogers wrote: > > I rechecked the connections and everything was good. The battery voltage was > > low, however, so I swapped in a new one. Now, the Octave switch and the > > Program 1 LED are back to normal. But, the VCA Attenuator is still not > > working. The switch tests good, and so do the diodes connected to it. I've > > also checked the verified the connections from DO3 to the KLM-367. > > Do you have continuity of D03 from the switch through KLM-369 to KLM-367? > > I just had a Polysix with a non-working EG mode switch and a problematic > attenuator; turned out that a trace on KLM-369 (the left board) was broken > (in my case P10 was the culprit). Both KLM-370 and 369 can be affected by > battery leakage. >
2011-01-29 by klosmon
> > > > > > > At 2:02 Uhr +0000 27.01.2011, Alexis V. Rogers wrote: > > > I rechecked the connections and everything was good. The battery > voltage was > > > low, however, so I swapped in a new one. Now, the Octave switch > and the > > > Program 1 LED are back to normal. > In the first place, that's pretty strange, since the battery affects neither of those. > But, the VCA Attenuator is still not > > > working. The switch tests good, and so do the diodes connected to > it. I've > > > also checked the verified the connections from DO3 to the KLM-367. > > > Look at IC35 on the CPU board -- pins 4, 7, 14 and 13 should be seeing D04 through D07. Pin 5 should be seeing the P25 line from the CPU. Turning the rotary switch should show varying outputs on pins 2, 10, 1 and 11. ~G > > > > [Non-text portions of this message have been removed]
2011-02-01 by Alexis V. Rogers
--- In PolySix@yahoogroups.com, klosmon <klosmon@...> wrote: > > > > > > > > > > > > > > At 2:02 Uhr +0000 27.01.2011, Alexis V. Rogers wrote: > > > > I rechecked the connections and everything was good. The battery > > voltage was > > > > low, however, so I swapped in a new one. Now, the Octave switch > > and the > > > > Program 1 LED are back to normal. > > > In the first place, that's pretty strange, since the battery affects > neither of those. Yeah, I thought that was strange too. > > But, the VCA Attenuator is still not > > > > working. The switch tests good, and so do the diodes connected to > > it. I've > > > > also checked the verified the connections from DO3 to the KLM-367. > > > > > > Look at IC35 on the CPU board -- pins 4, 7, 14 and 13 should be seeing > D04 through D07. Pin 5 should be seeing the P25 line from the CPU. > Turning the rotary switch should show varying outputs on pins 2, 10, 1 > and 11. I verified continuity from IC35 pins, 4, 7, 14, and 13 to DO4 through DO7, and from pin 5 to P25. Turning the rotary switch I get a constant 0V on pins 2, 10, 1, and 11. -Alex
2011-02-01 by klosmon
Alexis V. Rogers wrote: > > > > > - > I verified continuity from IC35 pins, 4, 7, 14, and 13 to DO4 through > DO7, and from pin 5 to P25. Turning the rotary switch I get a constant > 0V on pins 2, 10, 1, and 11. > > -Alex > > It's conceivable that IC35 (CMOS 4042) is dead; is there 5V at pin 16? As long as you're checking continuity, look at the resistor network of R94 - 97 from the output pins; the junction of the four resistors should connect to pin 6 of CN03 to the effects board. Also, check the connections from the front panel: the rotary switch requires connections to P10, 11, 12 & 13, and D03. It's unfortunate you don't have access to a scope: while continuity checking is good, viewing the test points with a scope is a much faster way of determining what's working correctly & what isn't. ~G [Non-text portions of this message have been removed]
2011-02-02 by Alexis V. Rogers
There is 5V at IC35 pin 16. All of the connections check ok. And, I do have access to a scope. --- In PolySix@yahoogroups.com, klosmon <klosmon@...> wrote:
> It's conceivable that IC35 (CMOS 4042) is dead; is there 5V at pin 16? > As long as you're checking continuity, look at the resistor network of > R94 - 97 from the output pins; the junction of the four resistors > should connect to pin 6 of CN03 to the effects board. > > Also, check the connections from the front panel: the rotary switch > requires connections to P10, 11, 12 & 13, and D03. > > It's unfortunate you don't have access to a scope: while continuity > checking is good, viewing the test points with a scope is a much faster > way of determining what's working correctly & what isn't. > > ~G
2011-02-02 by klosmon
Alexis V. Rogers wrote: > > > There is 5V at IC35 pin 16. All of the connections check ok. > In that case, I'd suggest replacing IC35. [Non-text portions of this message have been removed]
2011-02-20 by Alexis V. Rogers
Replacing IC35 didn't solve the issue. Any other suggestions? Thanks. --- In PolySix@yahoogroups.com, klosmon <klosmon@...> wrote:
> In that case, I'd suggest replacing IC35. > > > [Non-text portions of this message have been removed] >
2011-02-20 by klosmon
At this point I'm out of ideas. Long-distance diagnosis isn't my strong suit. ~G Alexis V. Rogers wrote: > > > Replacing IC35 didn't solve the issue. Any other suggestions? Thanks. > > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>, > klosmon <klosmon@...> wrote: > > In that case, I'd suggest replacing IC35. > > > > > > [Non-text portions of this message have been removed] > > > > [Non-text portions of this message have been removed]
2011-02-20 by Andrew Jury
Hi Alexis, I am a bit out of the loop on this one and don¹t have access to the message board to cover old ground. However, can you verify that you have a clock signal present at pin 5 of IC35. You can do this with either an oscilloscope or a logic probe. Experience has show that the PIO lines P25 and P24 are a great source of trouble in this area because the tracks run back to the CPU directly underneath where the battery used to be! Cheers, Andy On 20/02/2011 07:04, "klosmon" <klosmon@sbcglobal.net> wrote: > > > > > > At this point I'm out of ideas. > Long-distance diagnosis isn't my strong suit. > > ~G > > Alexis V. Rogers wrote: >> > >> > >> > Replacing IC35 didn't solve the issue. Any other suggestions? Thanks. >> > >> > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com> >> <mailto:PolySix%40yahoogroups.com>, >> > klosmon <klosmon@...> wrote: >>> > > In that case, I'd suggest replacing IC35. >>> > > >>> > > >>> > > [Non-text portions of this message have been removed] >>> > > >> > >> > > [Non-text portions of this message have been removed]