[sdiy] Juno 60 memory button carbon contacts

[Rutger Vlek]

It's a diode switch matrix with a resistor array of 33K pull-up resistors (to +5V). The matrix is scanned directly by the CPU. I don't see any correlation with specific lines (rows or columns) of the switch matrix being problematic.

Rutger


On 25 jun 2016, at 15:38, MTG wrote:

> Maybe there is a secondary problem for those? What is the circuitry that drives or senses the contact?
> 
> On 6/25/2016 3:00 AM, Rutger Vlek wrote:
>> 
>> Personally, I'm surprised 50 ohms is not low enough to trigger the detection of a closed switch.
>> 
>> Regards,
>> 
>> Rutger
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