Nakamichi faceplate button interface to main unit: resistor ladder?

whiterabbit · 3rd March 2009, 06:26 PM

Hi guys,

I'm looking at the MB-75 service manual but the scan is fuzzy at best.

The goal is to add a wired remote without affecting the removable faceplate. So I am trying to figure out how Nakamichi gets the controls into the main body so I can intercept the wiring inside the main unit.

I don't see any IC's responsible for controls. Not in the service manual, not in the board itself in front of me (MB-100). And It's REALLY HARD to trace the PCB, and there is no schematic, only a block diagram. Buteverything seems to suggest it is just a resistor ladder to interface the entire faceplate into the main body!

Could it really really be just this easy?

And if anyone knows the actual pinouts of the facepate connector, I would really appreciate the help. It will save me so much time and headache trying to trace those leads around on a painted PCB!

best regards,

Steve

whiterabbit · 3rd March 2009, 07:55 PM

Embarrassing, but please disregard.

The answer is yes it is that easy.

as we look at the connector, top left is switch ground. top right is switch 12-22 and bottom right is switch 1-11.

Each half represents the entire left or right side of the face plate.

reset gets its own dedicated pin next to sw 12-22.

3rd March 2009, 06:26 PM	#1
whiterabbit diyAudio Member Join Date: Apr 2005 Location: Bay Area	Nakamichi faceplate button interface to main unit: resistor ladder? Hi guys, I'm looking at the MB-75 service manual but the scan is fuzzy at best. The goal is to add a wired remote without affecting the removable faceplate. So I am trying to figure out how Nakamichi gets the controls into the main body so I can intercept the wiring inside the main unit. I don't see any IC's responsible for controls. Not in the service manual, not in the board itself in front of me (MB-100). And It's REALLY HARD to trace the PCB, and there is no schematic, only a block diagram. Buteverything seems to suggest it is just a resistor ladder to interface the entire faceplate into the main body! Could it really really be just this easy? And if anyone knows the actual pinouts of the facepate connector, I would really appreciate the help. It will save me so much time and headache trying to trace those leads around on a painted PCB! best regards, Steve

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3rd March 2009, 07:55 PM	#2
whiterabbit diyAudio Member Join Date: Apr 2005 Location: Bay Area	Embarrassing, but please disregard. The answer is yes it is that easy. as we look at the connector, top left is switch ground. top right is switch 12-22 and bottom right is switch 1-11. Each half represents the entire left or right side of the face plate. reset gets its own dedicated pin next to sw 12-22.

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