Subject:
|
Handyboard Troubleshooting
|
Newsgroups:
|
lugnet.robotics.handyboard
|
Date:
|
Thu, 5 Jun 1997 22:16:33 GMT
|
Original-From:
|
J. Grand <smooth@bu.eduSPAMLESS>
|
Viewed:
|
1330 times
|
| |
|
|
I was given a Handyboard v1.2 some friends of mine and it wasn't
functioning correctly. I used the assembly and troubleshooting
instructions to try and get things working, and then I got stuck..
Here's the deal:
I got to step 6.0.5, testing the LCD screen.. I believe my problem is
somewhere in the memory circuit.. I get no errors when I program the
bootstrap, CONFIG, and the pcode_hb.s19 (I'm using DL for DOS).
When I power on the handyboard, I get no beep from IC, no LCD display
(see below).. running IC at this point does nothing but give me errors..
I'm not sure if this is right, but once I put in the 74hc132 and the
memory IC, the charge LED always stays on at power up (instead of
blinking like it usually does) - is this correct?
Also, the LCD display might be busted too - when I plug it is, the top
row is dark (all on), but the bottom row is dimly light..
The 74HC373 soldered to the board might be the problem, too, but I don't
want to desolder it until I can try and pinpoint the actual problem.
Everything else seems to work so far: entering download mode, downloading
the code, etc.. Do you have any suggestions? I have replaced the 74HC132,
but haven't replaced the memory IC (I don't know where to get a
replacement).. I don't know how/why the memory IC or the soldered 74HC373
would fry, but its possible..
Oh, this board used to work, until someone used the wrong 4-wire cable on
it, and then it stopped working.. That's when they gave it to me..
Any help would be appreciated! Thanks..
Joe
smooth@acs.bu.edu
|
|
1 Message in This Thread:
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
