Search found 5 matches

by johncdelacy
03 Apr 2012, 02:33
Forum: Mindstorms Hardware
Topic: Wierd USB Issues
Replies: 10
Views: 12452

Re: Wierd USB Issues

Matt,

Thank you for the info. I used it and found a dozen or so NXT devices that I removed. What is the impact of having all these hidden devices out there?

John
by johncdelacy
31 Mar 2012, 06:53
Forum: Mindstorms Hardware
Topic: Wierd USB Issues
Replies: 10
Views: 12452

Re: Wierd USB Issues

Xander,

Where in the device manager do you find devices related to the NXT? And where are the hidden ones?

Thanks.

John
by johncdelacy
20 Mar 2012, 23:26
Forum: Mindstorms Hardware
Topic: Bad NXT Battery?
Replies: 5
Views: 6038

Re: Bad NXT Battery?

The waveform refers back to my comment about RMS readings with the DVM. A non-sine wave could give an erroneous reading if the meter isn't true RMS. Lego told me they have discontinued the AC charger power supply and recommended I purchase one on the internet that adhered to the 9-12V spec. The tran...
by johncdelacy
20 Mar 2012, 04:35
Forum: Mindstorms Hardware
Topic: Bad NXT Battery?
Replies: 5
Views: 6038

Re: Bad NXT Battery?

Matt, Yes, it is a possible conclusion that using a power supply that is listed as "12V" but actually produces 15V with no load (that means not connected to the battery) could destroy a device that cannot tolerate more than 12 volts. So, what does it mean for Lego to specify a supply from ...
by johncdelacy
20 Mar 2012, 00:49
Forum: Mindstorms Hardware
Topic: Bad NXT Battery?
Replies: 5
Views: 6038

Bad NXT Battery?

Greetings, I'm new to this forum, just having discovered it. I have an old dark gray NXT battery (the one Lego calls the "AC" battery). It does not charge with the AC charger anymore. The output voltage is about 5.4V and doesn't change when the charger is plugged in. The green light glows ...