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 Robotics / Handy Board / 8452
8451  |  8453
Subject: 
Re: Serial LED is not lighting up during charger board assembly
Newsgroups: 
lugnet.robotics.handyboard
Date: 
Sun, 26 Aug 2001 22:15:57 GMT
Viewed: 
1803 times
  
Hi Scott,

as I mentioned before i only assembled some 6.270 boards, but no handyboard.
So what's follwing is only what i guess.
I can't check this out here.

Are you able to measure (always with pin7 J9 as ground reference) +9V at
pin2 U16 and -9V at pin6 U16 ?

If so then you're connecting pin6 U16 to pin2 J9 (or pin 8 U16 which is the
same). That means -9V to the (resistor in series !! or our LED will light up
bright but a short time and only once !) cathode of the green LED. The anode
should be connected to ground in the circuit (pin7 J9 and the anode of the
LED should have a connection).
(Have a look at hbmanual.pdf page 52)

When doing so the LED should light up.

If not your LED might be blown or the wrong direction, but you're sure that
it's not. Or your resitor in series with LED is blown (or the wrong one, it
limits the current of the LED. So if it's the wrong one the LED won't light
up (or one short time, very bright :(  )

Regards,

Rainer

In lugnet.robotics.handyboard, Scott Hazel writes:
  I'm in the middle of assembling the Serial Interface and Batt. Charger
board but have run into a snag.  While testing the serial circuit, I was
able to see the +-9V values on pin 2 of U16.  However, when testing the
transmit and receive functions of the MAX232 chip, I can't get the green LED
to light up. There are no troubleshooting/debugging tips for this section.
I'm pretty sure
that I installed the LED correctly.  The short lead is the cathode
(negative) and goes into the square hole for SER LED. If this LED was
installed backwards, would that account for getting the right voltages but
no light?

  One caveat on my part, I misunderstood the directions and have already
installed the 25pin Serial connector (J9) so I've been making my
measurements with a bare lead inserted into the proper hole (pin 7, etc.)  I
don't see how that would impact this problem but its best not to leave any
details out.  Any suggestions on how to troubleshoot the serial LED not
lighting up?  Thanks.

  Scott

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Message has 1 Reply:
  Re: Serial LED is not lighting up = pilot error
 
I believe I've determined the problem. It looks like pilot error. Upon closer inspection of the serial LED, I noticed that it was defintely backwards in comparison to the power LED. I know that the power LED works like it should so the serial LED (...) (23 years ago, 3-Sep-01, to lugnet.robotics.handyboard)

Message is in Reply To:
  Serial LED is not lighting up during charger board assembly
 
I'm in the middle of assembling the Serial Interface and Batt. Charger board but have run into a snag. While testing the serial circuit, I was able to see the +-9V values on pin 2 of U16. However, when testing the transmit and receive functions of (...) (23 years ago, 25-Aug-01, to lugnet.robotics.handyboard)

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