Circuit Bending Casio MT68

looperama · Joined: Mar 22, 2014 Posts: 1 Location: scotland

Hi,

I would like to do a very simple alteration to my Casio MT68- I'd like to mute the bass in the Auto Accompaniment. I've seen people adding a switch to do this in pictures online, but I'd be happy just to mute it permanently.

I haven't done any circuit bending before. Can anyone tell me how to find the path I will need to cut?

Thankyou,

Stuart

wax+wire · Joined: Sep 28, 2014 Posts: 17 Location: Australia

i think i've done this with my MT-46. the process would be similar.

get a speaker/headphones/amp+guitar cable and connect the ground of the speaker to the ground and the *signal* to a probe.

Probe around on the PCB until you hear just the part you want (or don't want). If you want a 'bass off' switch, cut the trace where you can hear just the bass of the accompaniment and solder a switch over it.

In the MT-46 the accompaniment elements all come out of a CPU type IC and flow along traces before running flowing through a resistor and mixing all together.

scorpiistar · Joined: Feb 28, 2007 Posts: 9 Location: australia

im trying to attach the schematic......the bit youre interested in

this should help you out........the service manual,is available online

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mt65/68 schemo

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