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Resolved Resolved by DJ Sures!

Help On Recovering From A Stupid Moment On The Ezb

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I got my head all back together and the neck, etc. I have a battery going through a 640 ohm resistor to a female extention plug. I plug this in to test the LEDs. Each one worked very good but one did not. I checked reverse polarity on the circuit and the LED worked. I did not want to take the head all apart again (hassel). So , I simply turned the plug around not realizing if i were hurting something or not. But, it did not seem that it would damage the EZB because I was simply swapping ground and signal. I can't see very well, I may have plugged a plug in shifting one pin over. that would connect ground to hot or signal to hot.

Anyway, boiling it down, All of my digital pins do not work anymore.

Any ideas? I am thinking voltage regulator blown, I hope it is not the cpu. I am going to run the test that D.J. has and try to figure it out. The lights blink red and blue and it connects up. So , the bluetooth is working.

Wish me luck.

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#17  

OK,Now which is VR1 and which is VR2?

You STILL think it is the regulators even though I have +5v on all the power pins going to the digital and analog ports? and the place where it says 3.3v I have 3.3 volts. And the place it is supposed to be 7.2v , I have that. On the i/o pins, I will have to check for the signal pins and see what voltage are on them.

Thank You soo much.

#18  

Ok, I am all set. I know where to get the regulators. And I know which ones. That part is done.

But, which regulator goes on VR1 and which regulator goes on VR2.

And, If I am getting my 3.3v and 5v and 7.2 in the right places, maybe it is NOT the regulators.

What do you think?

I hate to ask so many questions, but I don DON'T want to burn up the EZB.

Here are my latest readings:

On VR-1 =7.2v going in =5v going out On VR-2=7.2v going in =5v going out On digital lines= 5v on power = 0v on ground = 2.1v on signal line. On PC Board the 3.3v = 3.3 volts

It all sounds correct to me. But, (NONE of the I/o works.)
But, the wireless connects as promised.

Thanks,D.J., Skater, and Robodoc. You have all helped me countless number of times.

I would like to hear what RICH has to say. :-)

Mel

#19  

This is just a repeat of the 5 volt regulators that now includes the Printed Circuit Assembly Board designations.

  1. LM1084 IT 5.0 ( VR1 )
  2. MIC29300 5.0 WT ( VR2 )

You should check with EZ-B support for what might be failing on your V3 EZ-B.

United Kingdom
#20  

I've stayed out of this one as it's stuff I don't know too much about (as in I've never really looked at the circuitry of the EZ-B or run diagnostics).

If you are struggling with it I'm sure if you send it to the EZ-Robot's team they will take a look at it and sort it out.

The only thing in addition that I can think to do, and it probably wouldn't help at all but worth a try is to set up 20 test LEDs (one per port) and set up a simple script or add controls to turn the LEDs on and off.


SET(D0, On)
SLEEP(2000)
SET(D0, OFF)
SLEEP(2000)
# Continue for the other 19 ports...
#21  

I did that sort of. I got one LED and hooked it to the 3 wire connector and tested one at a time. None of the ports toggled on and off.

#22  

thank you both! Now I know the answer to my question. Which if VR1 and VR2. Thank you, robo-doc.

I have sent an email to the support team.

;)

United Kingdom
#23  

Silly question maybe but I assume you have double checked that the LED works and it is the EZ-B not the LED that's not working?

#24  

RICH, good point. But NO, I tried it on several devices also and several LEDs. Here is what is happening:

LEDs flash-I can hook to bluetooth. All voltages are what they should be. CPU has zero ability to turn digital and analog ports on and off. They just stay off.

I think it is the cpu.

I have contacted customer support.

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