Korg DW8000, Mono/Poly, MS-20...

Any one have the proceedure for replacing the NiCad to Coin cell? I
think you need to add a diode and possibly remove a capacitor.

A wee bit more to it than that.
According to Korg service bulletin for poly-61.
1) remove R70(470 ohm)
2)Remove transistor Q10
3)Rep-lace nicad with lithium battery in same location
4)solder one 1N914 diode(or equiv) at location R70 and and another
between Emitter and collector of Q10( cathode to C and anode to E)
5) if the CPU board is KLM475, change R146 to 2.2k ohm.
if Cpu board KLM506 disregard R146
pretty sure this procedure is accurate from more than one experience.
the diode at position R70 by the way, mounts on the PCB with its anode
pointecd towards Q10, cathode pointed towards(not connected) the
positive end of battery.good luck. Russ

On Oct 26, 2005, at 9:51 PM, lnz2166 wrote:

> Any one have the proceedure for replacing the NiCad to Coin cell? I
> think you need to add a diode and possibly remove a capacitor.
>
>
>
>
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--- In DW8000@yahoogroups.com, Russell Rose <russrose@m...> wrote:

> Holy Smokes, I took a chance before I got this message and just

removed R70 and replaced it with a Diode. It worked, I'm able to
store programs and it holds them in memory. Thats not to say,looking
at your email that doing it my way wont have any long term affects.
Varta makes Nickel Metal Hydride batteried which are recharable.
Wondering if this wouldn't be an easier solution?
Any thoughts

>

A wee bit more to it than that.

> According to Korg service bulletin for poly-61.
> 1) remove R70(470 ohm)
> 2)Remove transistor Q10
> 3)Rep-lace nicad with lithium battery in same location
> 4)solder one 1N914 diode(or equiv) at location R70 and and another
> between Emitter and collector of Q10( cathode to C and anode to E)
> 5) if the CPU board is KLM475, change R146 to 2.2k ohm.
> if Cpu board KLM506 disregard R146
> pretty sure this procedure is accurate from more than one

experience.

> the diode at position R70 by the way, mounts on the PCB with its

anode

> pointecd towards Q10, cathode pointed towards(not connected) the
> positive end of battery.good luck. Russ
>
> On Oct 26, 2005, at 9:51 PM, lnz2166 wrote:
>
> > Any one have the proceedure for replacing the NiCad to Coin cell?

I

> > think you need to add a diode and possibly remove a capacitor.
> >
> >
> >
> >
> >
> > ------------------------ Yahoo! Groups Sponsor -------------------

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okay. On the same service bulletin that Korg issued on Oct1990(for
you history buffs)
they also outlined battery sub procedure for the Poly-6, which is
simply replacing the battery
and removing R91(100 ohm) and putting diode in its place. So the
point being why would their engineers put a tech to
the extra work, unless there was a good reason. My guess is this: to
reduce the drain current
on the backup battery. I dont have a schematic in front of me but I
guess that a precious
amount of your battery's current is being wasted on forward biasing
Q10, thereby reducing
battery life. If you have the means check the refresh voltage at the
RAM, with power off,
should be around 2.8-3.1 volts Or check the current drain on the
battery(power off)
should be less than a coupla microamps, ideally less than one
microamp. I have no
thoughts on your other Ni-Hydride battery question without checking
the specs/characteristics
of the two batteries in question. Russ

On Oct 27, 2005, at 11:59 PM, lnz2166 wrote:

> --- In DW8000@yahoogroups.com, Russell Rose <russrose@m...> wrote:
>
>> Holy Smokes, I took a chance before I got this message and just
>>
> removed R70 and replaced it with a Diode. It worked, I'm able to
> store programs and it holds them in memory. Thats not to say,looking
> at your email that doing it my way wont have any long term affects.
> Varta makes Nickel Metal Hydride batteried which are recharable.
> Wondering if this wouldn't be an easier solution?
> Any thoughts
>
>
>>
>>
>
>
> A wee bit more to it than that.
>
>> According to Korg service bulletin for poly-61.
>> 1) remove R70(470 ohm)
>> 2)Remove transistor Q10
>> 3)Rep-lace nicad with lithium battery in same location
>> 4)solder one 1N914 diode(or equiv) at location R70 and and another
>> between Emitter and collector of Q10( cathode to C and anode to E)
>> 5) if the CPU board is KLM475, change R146 to 2.2k ohm.
>> if Cpu board KLM506 disregard R146
>> pretty sure this procedure is accurate from more than one
>>
> experience.
>
>> the diode at position R70 by the way, mounts on the PCB with its
>>
> anode
>
>> pointecd towards Q10, cathode pointed towards(not connected) the
>> positive end of battery.good luck. Russ
>>
>> On Oct 26, 2005, at 9:51 PM, lnz2166 wrote:
>>
>>
>>> Any one have the proceedure for replacing the NiCad to Coin cell?
>>>
> I
>
>>> think you need to add a diode and possibly remove a capacitor.
>>>
>>>
>>>
>>>
>>>
>>> ------------------------ Yahoo! Groups Sponsor -------------------
>>>
> -
>
>>> ~-->
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>>> home page
>>> http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/QnLolB/TM
>>> ------------------------------------------------------------------
>>>
> --
>
>>> ~->
>>>
>>>
>>> Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>
>
>
>
>
>
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> ~-->
> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your
> home page
> http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/QnLolB/TM
> --------------------------------------------------------------------
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>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>

This is timely. I'm planning on replacing the battery
on my poly 61 sometime this winter.
I sold it to someone 14 years ago, it sat in the
closet 14 years, they gave it back to me last March.
It still had all of my old programs in it which I
promptly dumped into a wave file.
It's not an incredibly versatile keyboard but it's
great at some sounds
Bob

--- Russell Rose <russrose@...> wrote:

> okay. On the same service bulletin that Korg issued
> on Oct1990(for
> you history buffs)
> they also outlined battery sub procedure for the
> Poly-6, which is
> simply replacing the battery
> and removing R91(100 ohm) and putting diode in its
> place. So the
> point being why would their engineers put a tech to
> the extra work, unless there was a good reason. My
> guess is this: to
> reduce the drain current
> on the backup battery. I dont have a schematic in
> front of me but I
> guess that a precious
> amount of your battery's current is being wasted on
> forward biasing
> Q10, thereby reducing
> battery life. If you have the means check the
> refresh voltage at the
> RAM, with power off,
> should be around 2.8-3.1 volts Or check the current
> drain on the
> battery(power off)
> should be less than a coupla microamps, ideally less
> than one
> microamp. I have no
> thoughts on your other Ni-Hydride battery question
> without checking
> the specs/characteristics
> of the two batteries in question. Russ
> On Oct 27, 2005, at 11:59 PM, lnz2166 wrote:
>
> > --- In DW8000@yahoogroups.com, Russell Rose
> <russrose@m...> wrote:
> >
> >> Holy Smokes, I took a chance before I got this
> message and just
> >>
> > removed R70 and replaced it with a Diode. It
> worked, I'm able to
> > store programs and it holds them in memory. Thats
> not to say,looking
> > at your email that doing it my way wont have any
> long term affects.
> > Varta makes Nickel Metal Hydride batteried which
> are recharable.
> > Wondering if this wouldn't be an easier solution?
> > Any thoughts
> >
> >
> >>
> >>
> >
> >
> > A wee bit more to it than that.
> >
> >> According to Korg service bulletin for poly-61.
> >> 1) remove R70(470 ohm)
> >> 2)Remove transistor Q10
> >> 3)Rep-lace nicad with lithium battery in same
> location
> >> 4)solder one 1N914 diode(or equiv) at location
> R70 and and another
> >> between Emitter and collector of Q10( cathode to
> C and anode to E)
> >> 5) if the CPU board is KLM475, change R146 to
> 2.2k ohm.
> >> if Cpu board KLM506 disregard R146
> >> pretty sure this procedure is accurate from more
> than one
> >>
> > experience.
> >
> >> the diode at position R70 by the way, mounts on
> the PCB with its
> >>
> > anode
> >
> >> pointecd towards Q10, cathode pointed towards(not
> connected) the
> >> positive end of battery.good luck. Russ
> >>
> >> On Oct 26, 2005, at 9:51 PM, lnz2166 wrote:
> >>
> >>
> >>> Any one have the proceedure for replacing the
> NiCad to Coin cell?
> >>>
> > I
> >
> >>> think you need to add a diode and possibly
> remove a capacitor.
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> ------------------------ Yahoo! Groups Sponsor
> -------------------
> >>>
> > -
> >
> >>> ~-->
> >>> Get fast access to your favorite Yahoo! Groups.
> Make Yahoo! your
> >>> home page
> >>>
>

http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/QnLolB/TM

> >>>
>

------------------------------------------------------------------

> >>>
> > --
> >
> >>> ~->
> >>>
> >>>
> >>> Yahoo! Groups Links
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >
> >
> >
> >
> >
> >
> > ------------------------ Yahoo! Groups Sponsor
> --------------------
> > ~-->
> > Get fast access to your favorite Yahoo! Groups.
> Make Yahoo! your
> > home page
> >
>

http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/QnLolB/TM

> >
>

--------------------------------------------------------------------

>
> > ~->
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>
>

__________________________________
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http://www.yahoo.com/r/hs

---Russ, Thanks for the insight. I did the proceedure outline in your
last email and it was straight forward. I now feel confident with the
whole replacement.



In DW8000@yahoogroups.com, Russell Rose <russrose@m...> wrote:

>
> okay. On the same service bulletin that Korg issued on Oct1990(for
> you history buffs)
> they also outlined battery sub procedure for the Poly-6, which is
> simply replacing the battery
> and removing R91(100 ohm) and putting diode in its place. So the
> point being why would their engineers put a tech to
> the extra work, unless there was a good reason. My guess is this:

to

> reduce the drain current
> on the backup battery. I dont have a schematic in front of me but

I

> guess that a precious
> amount of your battery's current is being wasted on forward

biasing

> Q10, thereby reducing
> battery life. If you have the means check the refresh voltage at

the

> RAM, with power off,
> should be around 2.8-3.1 volts Or check the current drain on the
> battery(power off)
> should be less than a coupla microamps, ideally less than one
> microamp. I have no
> thoughts on your other Ni-Hydride battery question without

checking

> the specs/characteristics
> of the two batteries in question. Russ
> On Oct 27, 2005, at 11:59 PM, lnz2166 wrote:
>
> > --- In DW8000@yahoogroups.com, Russell Rose <russrose@m...> wrote:
> >
> >> Holy Smokes, I took a chance before I got this message and just
> >>
> > removed R70 and replaced it with a Diode. It worked, I'm able to
> > store programs and it holds them in memory. Thats not to

say,looking

> > at your email that doing it my way wont have any long term

affects.

> > Varta makes Nickel Metal Hydride batteried which are recharable.
> > Wondering if this wouldn't be an easier solution?
> > Any thoughts
> >
> >
> >>
> >>
> >
> >
> > A wee bit more to it than that.
> >
> >> According to Korg service bulletin for poly-61.
> >> 1) remove R70(470 ohm)
> >> 2)Remove transistor Q10
> >> 3)Rep-lace nicad with lithium battery in same location
> >> 4)solder one 1N914 diode(or equiv) at location R70 and and

another

> >> between Emitter and collector of Q10( cathode to C and anode to

E)

> >> 5) if the CPU board is KLM475, change R146 to 2.2k ohm.
> >> if Cpu board KLM506 disregard R146
> >> pretty sure this procedure is accurate from more than one
> >>
> > experience.
> >
> >> the diode at position R70 by the way, mounts on the PCB with its
> >>
> > anode
> >
> >> pointecd towards Q10, cathode pointed towards(not connected) the
> >> positive end of battery.good luck. Russ
> >>
> >> On Oct 26, 2005, at 9:51 PM, lnz2166 wrote:
> >>
> >>
> >>> Any one have the proceedure for replacing the NiCad to Coin

cell?

> >>>
> > I
> >
> >>> think you need to add a diode and possibly remove a capacitor.
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> ------------------------ Yahoo! Groups Sponsor -----------------

--

> >>>
> > -
> >
> >>> ~-->
> >>> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your
> >>> home page
> >>> http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/QnLolB/TM
> >>> ----------------------------------------------------------------

--

> >>>
> > --
> >
> >>> ~->
> >>>
> >>>
> >>> Yahoo! Groups Links
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >
> >
> >
> >
> >
> >
> > ------------------------ Yahoo! Groups Sponsor -------------------

-

> > ~-->
> > Get fast access to your favorite Yahoo! Groups. Make Yahoo! your
> > home page
> > http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/QnLolB/TM
> > ------------------------------------------------------------------

--

> > ~->
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>