Subject:
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Re: Help! Hanyboard Assembly Testing problem!
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sun, 13 Jan 2002 06:50:15 GMT
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Viewed:
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2512 times
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Hi!
I'm still can't get the chip to go into bootstrap mode. I've double checked
I've got all the components installed in the correct direction, and
inspected the entire board for shorts, and have found none! What can I do??
I'll try resoldering the processor chip socket. I tried to search for a new
processor at Frys Electronics, but they don't have them... I'll try a few
surplus warehouses tomorrow/Monday. Any ideas, anyone???
The "power fluctuations" have gone away, as I have cleaned off all extra
flux, and used a soft brush attached to a dremel tool to clean and polish
the board (I hope that's all I've done ;-)... but it is a fairly soft brush,
and hasn't seemed to damage the board at all.
The "power leak" (Power light, and battery light stay on when power is
turned off, but only when charger board is connected.) is coming from max232
chip on the charger/serial board. I remove the max 232 chip, plug the 2
boards together, apply power to the charger board, and the problem goes
away. Is this "normal"? Looking at the HB schematics, pin 5 from the RJ11
Jack goes through a few resistors, and connects to both the power led, and
+5v, so if the max232 chip were to "leak" power to pin 5 of the RJ11 jack,
it would go to pin 5 on the HB, and power the board in some limited way. I
have replaced the max232 chip, and the problem is still there, so either
this is normal, or there is something VERY weird going on.
Also I don't understand how the processor can cause the green led to go out,
when in bootstrap mode. it looks like the power led is directly connected
via 2 resistors to a +5v supply. Hmm maybe I should test rp4? If rp4 was
bad, it could cause both these problems.
Sam
"LightMan" <Lightman@lightman.nospam.org> wrote in message
news:GpsqtI.FuI@lugnet.com...
> Hi!
>
> I'm putting together my shiny new HanyBoard. I've got to the point where
> I'm testing the serial line/power led on the HanyBoard itself.
>
> The processor won't seem to go into bootstrap mode(ie, the green light • won't
> go out, and attempts to download the bootstrap code fail in IC).
>
> The previous testing step, testing the processor's clock seems to work... • I
> have a logic probe, and pin 5 causes the logic probe to emit a fairly fast
> blinking light, accompanied with a beeping sound.
>
> All other tests have passed as well. I have also tested the stop switch, • to
> make sure it was functioning--it shorts when the button is pushed.
>
> Other things to note, that I find strange are:
> 1) somtimes the power led flickers once the board is fully powered. This
> seemed lessened once I cleaned to bottom of the board with a pcb board
> cleaner/degreaser (I thought it might be good to get rid of some of the • flux
> from soldering). Also this rarely happens when the board is on "external
> power" from the serial interface board/charger.
>
> 2) when powering the board from the serial interface board, and I power • off
> the handyboard using the switch, the power light will stay lit, and the
> battery light will also come on, so I may have some voltage getting onto • the
> board.
>
> 3) The download fails, but I appear to have com communications correct... • I
> can see the serial light flicker as the PC attempts to d/l the boot strap
> code. Also for some reason the power led on the handyboard will flicker
> when the boot strap code is downloaded.
>
> I would assume that I have some sort of tiny short somewhere, but I don't
> know where to look. Any ideas?
>
> Sam
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Message has 1 Reply:
Message is in Reply To:
 | | Help! Hanyboard Assembly Testing problem!
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| Hi! I'm putting together my shiny new HanyBoard. I've got to the point where I'm testing the serial line/power led on the HanyBoard itself. The processor won't seem to go into bootstrap mode(ie, the green light won't go out, and attempts to download (...) (23 years ago, 11-Jan-02, to lugnet.robotics.handyboard)
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