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Old 02-24-2011, 06:21 PM
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Default UMR with Casio MT-400V

There have been several questions regarding the compatibility of the Casio MT-400V keyboard with the UMR MIDI retrofit.

I haven't had the opportunity to inspect an MT-400V in person, but it looks like a good candidate for the UMR.

Anyone attempting the install can use the information to give it a try:

http://forum.highlyliquid.com/showthread.php?t=4

I would do my best to support anyone attempting the install.
  #2  
Old 03-01-2011, 12:03 PM
bc3 bc3 is offline
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Default MT-400V Photo

Photo of the 400V pcb should be attached.

What would be the best way to find the +5V and ground connections on the PCB?
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Old 03-02-2011, 02:32 PM
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Quote:
Originally Posted by bc3 View Post
Photo of the 400V pcb should be attached.

What would be the best way to find the +5V and ground connections on the PCB?
Power up the keyboard and set your multimeter to the "DC voltage" function.

On a circuit board like this, the ground and 5V rails can be found by checking the wider copper traces. Look for a pair of wide traces that measure 5V.

Ground & 5V are connected to many components across the circuit board, so look for traces that connect to large numbers of pins.

Focus the search near the digital components (rather than the analog audio circuitry near the audio connectors).

Specifically, I'd check the two adjacent horizontal wide traces in the center of my cropped image.

If you have found the right traces, you can disconnect power from the keyboard and use the multimeter "continuity test" function to see what other traces are connected (there are wire jumpers on the opposite side that join them). If you have identified the correct traces, they will reach all over the board and you can choose the connection point that is the most convenient.
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Last edited by John; 03-02-2011 at 02:34 PM.
  #4  
Old 03-09-2011, 01:12 PM
bc3 bc3 is offline
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Thanks John! I just received my other UMR kit so I will start this soon. I see that the UMR kit will work with a Casio MT-210 in the "scan low" configuration? Is there any chance that this same configuration and I/O connections would work with the MT-400V you think?
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Old 03-09-2011, 09:51 PM
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Quote:
Originally Posted by bc3 View Post
Thanks John! I just received my other UMR kit so I will start this soon. I see that the UMR kit will work with a Casio MT-210 in the "scan low" configuration? Is there any chance that this same configuration and I/O connections would work with the MT-400V you think?
It's possible that the MT-400V requires an identical configuration, but I would not risk "guessing". There is a risk of damaging the UMR and/or the MT-400V if the UMR configuration & wiring are incorrect.

If you can post a sketch of the matrix used in the MT-400V (or confirm that it is indeed identical to the MT-210), that will help us to determine the correct configuration. You'll have to unbolt the MT-400V keyswitch pcb and look at the traces & diodes to be sure.
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Old 03-13-2011, 12:31 AM
bc3 bc3 is offline
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John,

O.k., I was able to locate the +5V and ground on the PCB in the area you suggested, thanks!

I got to the keyswitch PCB and took a look at the traces and diodes. The keyswitch PCB looks pretty close to the MT-210 keyswitch PCB, but is not a perfect match. It looks like it does share the similarity of having 8 select lines connected to groups of 6 each w/ the 9th select line connected to a single key.

Where do you think I should go from here? Sorry for the poor quality on the photos-

Thanks!
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Old 07-27-2015, 03:48 PM
ending ending is offline
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Hi. Any luck with this yet?
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Old 08-15-2015, 06:12 PM
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Quote:
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Hi. Any luck with this yet?
http://forum.highlyliquid.com/showthread.php?t=839
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