Use CN10 as a reference point and make sure DO0-7 connects to every
terminating IC which requires access to the data bus. There are plenty of
them! When you measure use the metalwork of the connector and the pins of
the ICs as your test points, not the solder side. I have seen pads connected
before which do not connect to the pins themselves. Also, another problem
which comes up time after time is hidden battery dielectric leaked under the
CPU's holder. I generally remove, clean and replace these as a matter of
course.
Good luck,
Andy
On 17/01/2010 14:19, "backshall1 (dsl)" <backshall1@bellsouth.net> wrote:
> On the KLM 367 between some specific chips? I started checking resistance
> from the 14051s on the panel boards to the processor on the 367 board to
> verify A,B,C,INH1,INH2 getting through CN11 okay. It looks good.
> Don B.
>
> _____
>
> From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
> Andrew Jury
> Sent: Sunday, January 17, 2010 8:10 AM
> To: PolySix@yahoogroups.com
> Subject: Re: [PolySix] Wrong functions controlled by knobs?
>
>
>
>
> Ah, sorry Don, I misread that in a hurry, I thought you were setting up the
> a/d converter. If only Leds 1-5 light then pay special attention to bits DO5
> thru DO7!
>
> Let us know how you get on.
>
> Andy
>
> On 17/01/2010 12:57, "backshall1 (dsl)" <backshall1@bellsout
> <mailto:backshall1%40bellsouth.net> h.net> wrote:
>
>> Hi Andy,
>> I'll check out the data bus and inhibits. No, the calibration did not go
>> well. LEDs 1 and 8 are supposed to light up, and I could only get 1 and 5.
>> Thanks,
>> Don B.
>>
>> _____
>>
>> From: PolySix@yahoogroups <mailto:PolySix%40yahoogroups.com> .com
> [mailto:PolySix@yahoogroups <mailto:PolySix%40yahoogroups.com> .com] On
> Behalf Of
>> Andrew Jury
>> Sent: Sunday, January 17, 2010 7:35 AM
>> To: PolySix@yahoogroups <mailto:PolySix%40yahoogroups.com> .com
>> Subject: Re: [PolySix] Wrong functions controlled by knobs?
>>
>>
>>
>>
>> Hi Don,
>>
>> You almost certainly have track disconnections. Try and focus in on two
>> places of the 367. First the data bus DO0-DO7 and the multiplex address
> bus
>> INH1-3. Using your scope scope ensure that you have at least what look
> like
>> trains¹ of data pulse when you operate the controls. I find when dealing
>> with multiple problems like this it pays to select one of the problems and
>> focus in on it. Usually everything else will start to become apparent as
> you
>> make progress. Before you start, however, are you able to perform the
> reset
>> calibration procedure correctly? If you can verify this then we can
> proceed!
>>
>> Cheers,
>> Andy
>>
>> On 16/01/2010 13:56, "longenough2002" <backshall1@bellsout
>> <mailto:backshall1%40bellsouth.net> h.net> wrote:
>>
>>>
>>>
>>>
>>>
>>>
>>> Just got a Polysix in with some bizarre symptoms. It had an old battery
>>> in it that looked like it had just started to leak. Only a couple of
>>> traces had some black spots and still checked out okay with an ohmmeter.
>>> I put in a cr2032 and diode and it is saving patches okay. It's not
>>> until I twiddle some knobs that things start to get weird. Here is what
>>> works: Output, Bend, Tune, VCO, VCA, Arpeggiator, Key Assign, Programmer
>>> sections all OK. Problem sections: MG, VCF, EG, Effects. By Section: MG
>>> - Frequency, Delay and Mod work, but Level seems to be controlling VCF
>>> Cutoff, not modulation intensity. VCF - Cutoff does nothing, Resonance
>>> works when set between 5 and 10, but seems to control Attack when set
>>> between 0 and 5, EG Intensity does nothing, KBD Track works. EG - Attack
>>> does nothing, Decay works, but in reverse, as if EG Intensity is in the
>>> negative range. Release works between 5 and 10 but seems to do nothing
>>> between 0 and 5. Effects - switch works, but Intensity does nothing.
>>> It would seem the D/A is having serious problems, and I can't get LEDs 1
>>> and 8 to light up during the reset procedure. I get 1 and 5. I wish the
>>> service manual had some voltages to measure, instead of just watching
>>> lights. The +/-15 and +/-5v supplies look good. Anybody have ideas where
>>> to start debugging this? I have a scope and multimeter, but no logic
>>> analyzer. Thanks for any assistance you can provide. Don B.
>>>
>>> [Non-text portions of this message have been removed]
>>>
>>>
>>>
>>>
>>>
>>
>> [Non-text portions of this message have been removed]
>>
>>
>>
>>
>>
>>
>> [Non-text portions of this message have been removed]
>>
>>
>>
>> ------------------------------------
>>
>> PolySix "Digiest" Page: http://www.acc
> <http://www.acc.umu.se/~amber/Poly6Yahoo> umu.se/~amber/Poly6Yahoo! Groups
> Links
>>
>>
>>
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6Yahoo! Groups Links
>
>
>