Dolphin Diagnostics (2008) wiring repair help.

Jimrahbe said:

Gull,

That is a very old Dolphin Diagnostic robot with a bag filter. It has to be 20 years old!!!

It was the first type of robot that I ever owned. I still have the scars on my hands from removing and installing the motor box.

Newer units come with 2-wire cables when they have no remote control, but have 3-wire cables when they come with some kind of remote control. I assume that is true in your case, as the connectors are identical to what they use today.

I think you are peeing into the wind, as once water gets into the motor box, it corrodes the circuit cards, making them useless.

Sorry that I can't directly answer your question..

Hope you get it working.. If you decide to get a new one, check out the EVO..

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Thanks,

Jim R.

Click to expand...

Thanks. Mine doesn't have a remote, just the Power pack that has an On/Off switch. Not sure why there's a red wire from the circuit board connected on the underside, maybe there was an upgraded model that had a remote.
In that case, maybe the red wire doesn't do anything? Anyway, I'll do my best to put it back together and see if it works, if not I'll just scrap it.

I'll take a look at the EVO, though I'm pretty frugal when it comes to these, as they are a convenience not a necessity. I bought the Dolphin about 8 years ago used for $200, Lol. I guess I've gotten my money's worth.

Just a follow up! It's working again.

I took a gamble, that I probably shouldn't have, and spent $90 on a used replacement that looked in good condition, minus the power supply.
No surprise It didn't run. When I took the motor apart on it there was no sign of moisture. I did notice one of the resistors looked possibly burnt out. I removed that resistor from my old board and replaced it, and it's working again.

Honestly these things are pretty simple. There's two motors and a control board. I was debating ordering a control board replacement for $45 on eBay, I guess I don't have to now.

Jimrahbe said:

G,

There is no "possibly" to it. That resistor is toast!!!

Great job...

Thanks,

Jim R.

Click to expand...

Oops, that was actually the old board photo. The resistor that was burnt out from the new board is in the bottom of that photo. Robot is still working well.

I actually added another one to the collection. A dolphin DX3 was on Facebook for free marked as not working. I picked it up and the power supply tested good, took apart the motor box and it was clean and both motors worked. Ended up being the connector on the cord at the power supply end. If I don't put it all the way in the robot works fine. So I may just order a new connector end.

I know the DX3 is newer, but doesn't seem to run as well with its lower profile. Seems like one corner of it It is often cocked up in the air briefly, especially after coming off a wall or corner. My old school one never does this. Aside from that it's working just fine.

One of the two styrofoam floats on the motor box was missing, not sure if someone had taken It apart.
That really caused it to float awkwardly, I ordered another float for $5.
I removed the one in the meantime and it seems to work fine. Are those floats needed?