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mawkernow
newbie
Reged: 11/27/12
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DD-1 Dual axis controller dead
#5542366 - 11/27/12 03:48 PM
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I've recently come to find my DD-1 dual axis motor controller is dead, i.e. nothing happens when connected to a power supply.
Has anyone had one of these die, and know where to start with it?
I'm using this with a GP mount with RA and Dec motors, on which an Orion (UK) Optics Newtonian is mounted. As far as I'm aware, the motors themselves are OK.
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BillBwithley
member
Reged: 10/18/06
Loc: Essex, UK
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Re: DD-1 Dual axis controller dead
[Re: mawkernow]
#5542579 - 11/27/12 06:15 PM
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Bad news about your Vixen Controller. What power supply were you using ? I have one of these and I use the supplied battery case that uses 8 D cell batteries with no problems.
Apparently this controller will fry if you use more than 12V unregulated. I believe this is a known problem.
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Geo.
Carpal Tunnel
Reged: 10/01/08
Loc: Upstate NY
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Re: DD-1 Dual axis controller dead
[Re: BillBwithley]
#5542980 - 11/27/12 10:29 PM
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Have had one around for a while, but it seems that it should use a LM7805 for IC power. The LM7804 should handle the transients. The stepper driver uses IC power and supply power, so it'd be a suspect.
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rjsc2000
sage
Reged: 09/21/06
Loc: Portugal
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Re: DD-1 Dual axis controller dead
[Re: Geo.]
#5543384 - 11/28/12 08:05 AM
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Was the controller working ok? Did you changed the power plug for some reason? Many times the polarity is wrong and you blow up the 7805 that should exist right after the power plug in the unit.
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mawkernow
newbie
Reged: 11/27/12
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Re: DD-1 Dual axis controller dead
[Re: rjsc2000]
#5547301 - 11/30/12 02:11 PM
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I did change the power plug, but it was still 12V dc. I've tried a simple 12V mains adaptor, as well as a 12V from a power tank neither works.
I don't remember any specific time it stopped working, just that it didn't on the first time I used it in a good while.
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DAVIDG
Post Laureate
Reged: 12/02/04
Loc: Hockessin, De
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Re: DD-1 Dual axis controller dead
[Re: mawkernow]
#5547550 - 11/30/12 05:20 PM
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I've fixed a number of these. The problem is the cheap version of 7805 voltage regulator that is used in them and the fact that the polarity of the plug uses the center pin at ground vs the more common way of having the center pin hot. It can't take it if the polarity is reversed and it gets fried. This is what most likely happened. You can get much a better quality LM7805 from Radio Shack for under $2.00 and it takes about 15 minutes to replace. It is located at the bottom of the controller and attached to a metal bracket that is used as a heat sink.
- Dave
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