[sdiy] Juno 60 woes

[MTG]

He lifted the INT pin but didn't use a pullup so those tests he did were 
useless if you ask me.

On 6/5/2015 7:12 AM, Richie Burnett wrote:
> The CPU interrupt input should most likely be predominantly high but
> occasionally pulsing low.  Probably something like every 1ms to every
> 100ms.
>
> Were all the other clock frequencies correct?
>
> -Richie,
>
>
> -----Original Message----- From: Jack Jackson
> Sent: Friday, June 05, 2015 9:34 AM
> To: Richie Burnett ; Sdiy
> Subject: Re: [sdiy] Juno 60 woes
>
> Hi Richie,
>
> Thanks for your response.
>
> I think the interrupt is being generated (its active low and the line is
> at ground level).
>
> It seems that the INT is not being cleared by the CPU. Only the top
> octave (roughly) of keys seem to do anything. but they don't seem to
> relate to frequency correctly, they just play a frequency.
>
> Cheers,
> Jack
>
> ----------------------------------------
>> From: rburnett at richieburnett.co.uk
>> To: jackdamery at hotmail.co.uk; synth-diy at dropmix.xs4all.nl
>> Subject: Re: [sdiy] Juno 60 woes
>> Date: Thu, 4 Jun 2015 22:15:48 +0100
>>
>> On Panel Board B, Check for...
>>
>> 4 MHz clock signal on pin 1 of IC26 (TC40H393P),
>>
>> 2 MHz clock signal on pin 3 of IC26 and also pin 20 of IC24,
>>
>> 500 kHz clock signal on pin 5 and pin 13 of IC26,
>>
>> 31.25 kHz clock signal on pin 8 of IC26,
>>
>> Periodic low pulses on pin 4 of IC27 (TC40H002P),
>>
>> Also check the voltage at pin 21 of IC24 relative to ground (pin4 same
>> chip.)
>>
>> See bottom left corner of PANEL BOARD B schematic in Juno 60 Service
>> Notes.
>> The circuit seems to mostly relate to the DCB interface, but appears
>> to be
>> where the main CPU board processor's interrupt signal is being generated,
>> (or not being generated in your case.)
>>
>> Hope this helps. Good luck,
>>
>> -Richie,
>>
>> -----Original Message-----
>> From: Jack Jackson
>>
>> OK so I tried bending up the int pin on the CPU and then inserting the
>> chip
>> so the INT pin is not connected. Now I appear to get a signal and some
>> control of the parameters but only one frequency (one voice) and it
>> stays on
>> but I only hear this when i either press a key and then tap the INT
>> pin with
>> my finger, or move the bender and tap the INT pin.
>>
>> Any ideas?
>>
>
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