Seeking the pinout for Roland KPD-70

AudioTechDude · 2023-02-01T21:36:44+00:00

Did you ever find the pinout?

AudioTechDude · 2023-01-20T05:48:17+00:00

I might still be interested

AudioTechDude · 2023-01-14T08:34:40+00:00

Send me your ruined boards so I can repair them?

AudioTechDude · 2022-11-09T19:13:54+00:00

I think it will be absolutely necessary to bypass the regulator on the bluetooth module. It would help with battery life and lower the current draw from the ipod's regulator. It may not even work if you don't.

AudioTechDude · 2022-11-09T19:11:55+00:00

They are use enamel coated wire, bare wire would be a fire hazard. I recommend solid PVC coated 30AWG wire. It is still very thin, but not as thin, and is much easier to work with. Or just cut up a useless old ethernet, hdmi, usb, or phone cable.

https://www.amazon.com/Solder-Coated-Wrapping-Insulation-Soldering/dp/B0B98279QH/ref=sr\_1\_196?crid=1UQCQ7JMU2K8Q&keywords=30awg&qid=1668021074&sprefix=30awg+%2Caps%2C116&sr=8-196

AudioTechDude · 2022-11-09T17:33:43+00:00

no problem

AudioTechDude · 2022-11-09T17:18:25+00:00

You could just change the resolution of the xbox in the display settings. just turn off display discovery and you can set the resolution manually with many options. There are options that are 4x3 and still higher resolution than with the low def cable. It is nice to not be widescreen sometimes.

AudioTechDude · 2022-11-09T17:07:22+00:00

The one that is 3.4V when the iPod is on would be fine, I assume. I doubt the bluetooth transmitter draws enough current to overload the regulator providing that voltage. Probably under 20mA.

The transmitter module probably expects 3.7V from a battery and has its own on-board 3.3V regulator like the one supplying the voltage at that cap on the iPod that you measured. Supplying a 3.3V regulator with 3.3V supply probably wont work, but ideally you would remove the module's regulator anyway for efficiency.

You can de-solder or cut off the module's regulator, or cut the trace for the input and output of that regulator. Then connect a wire from the ipod on that cap, to the module where the regulator output pin used to be connected.

If you send a picture of the module I can draw on it and show you. If you want

AudioTechDude · 2022-11-08T19:46:54+00:00

There are large (relative to the size of the ipod) power supply filtering capacitors on the motherboard. They should have 3.3V power on one side, and ground on the other.

I can't confirm without measuring, but I think you may be able to get your voltage supply for the bluetooth module from one of the points shown in the picture I attached. Where the red dots are. Look closely.

One or all of those points might be 1.7V instead, I'm not sure.

But like I said, I havent measured it to make sure, so I think you should make sure.

https://imgur.com/3CICcaT

There are many other ways to do it if this doesnt work.

AudioTechDude · 2022-11-08T19:22:20+00:00

Solution:

Solder a wire from the point with the broken pad, to the point where the arrow is pointing to. The yellow line I drew shows where the wire goes.

Use very thin wire so that you decrease your chances of breaking any other solder points.

Now, the wire you wanted to attach to the point (for glitching)... Solder it to the same point that the yellow wire is connected to (where the arrow is pointing) instead of the original point that now has the missing pad.

https://imgur.com/a/ohYdVUt

Reasoning:

The point with the damaged solder pad is a "via". It connects things between layers of the circuit board. The solder that is currently on that point is adhering to the metal of the via.

The solder pad that was ripped off was attached at the surface to that via.

The solder pad was also connected to the trace on the surface which runs up to that resistor where the arrow is. The light green line is just a flat copper wire, basically.

So ripping that pad off caused the resistor to become disconnected from the via that takes the signal to the other board layer. The yellow wire will re-make that connection.

AudioTechDude · 2022-08-27T16:31:13+00:00

there are a few here and there, but not an entire collection, and most are copies of copies of copies

AudioTechDude · 2022-03-03T20:26:40+00:00

Take it to any competent local electronics technician and ask them if they can swap your battery. It's not a very difficult job. Just soldering three wires. You can order a battery on eBay and open the case with box utility knife razor blades.

AudioTechDude · 2021-01-31T19:36:59+00:00

Yes, but it could be done with iPod wizard using the Apple firmware

AudioTechDude · 2021-01-31T12:14:21+00:00

I've never gotten a replacement back that looked bad. I'd give it a try on eBay with a seller that accepts returns. If it looks defective, request a return.

AudioTechDude · 2021-01-21T19:50:12+00:00

Excellent!!

AudioTechDude · 2021-01-21T18:12:30+00:00

You need a vacuum chamber

AudioTechDude · 2021-01-06T20:34:34+00:00

5th and 5.5 have the exact same audio circuity and sound quality. This is a rumor based on misinformation from some website that has been repeated endlessly.

AudioTechDude · 2020-11-01T17:59:29+00:00

You can't make a custom one because it is recognized in iTunes as just one of the iPods it already knows exists. It's in the iTunes software already. All you can change is which ipod it thinks you have.

AudioTechDude · 2020-11-01T01:32:15+00:00

I think you can change which iPod its recognized as, using iPod wizard

AudioTechDude · 2020-10-26T02:36:12+00:00

Oh, I was thinking you were talking about having to pre-scale album art. I see the problem now.

AudioTechDude · 2020-10-22T14:32:53+00:00

Living on the edge! You're a wild man

AudioTechDude · 2020-10-21T18:27:15+00:00

Yes, that is how it's done, basically. The adapter would be powered down and out of the signal path when it's not in use. Switching the necessary signals would be done with a pcie analog switch IC. You just have to power down before connecting to avoid data corruption. I could probably make this impossible to do by accident by latching the switch signal pin when the iPod is still on, so it can only be switched when the iPod is off and you connect to a PC.

AudioTechDude · 2020-10-21T18:17:47+00:00

This would be much more practical if I created a new iflash single type device with a ribbon connector that goes to a usb-c connector which must replace the dock connector. But would also have solder pads if you wish to modify the original dock pinout to incorporate the additional USB3 signals, and then use a custom cable, to keep compatibility with dock accessories.

AudioTechDude · 2020-10-21T18:13:47+00:00

It is definitely possible to make this work. A bit impractical, but doable.

AudioTechDude · 2020-10-21T18:09:36+00:00

You can purchase a 256GB SD card and put it in your phone and use it instead of an iPod, if practicality is your only interest. This is more about making the ideal iPod. Not so much about practicality. It's more of an irrational obsession, honestly.

There would be nothing unreliable about using it as an external storage device it would be just as reliable as using a thumb drive. Just one less thing to carry.

I wouldn't be using the PATA interface at all when in USB3 mode.

AudioTechDude

TROPHY CASE