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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Tue, 15 Jan 2002 07:01:04 GMT
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Viewed:
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2627 times
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Ok,
RP4 was fine.
I've put a logic tester "MODA" line on the chip (from what I can figure,
this is this pin that gets the signal from the stop switch), and it is
recieving a signal when I press the stop switch.
I verified that the reset pin was getting a signal from u12. It is.
I also verified that that TxD pin recieves signals when I send data through
the serial line. It does.
So what could be wrong? I guess everyone's on vacation, or would have
gotten a reply by now. Anyone here? Anyone? I'd really like to get this
thing working.
Sam
"LightMan" <lightman@lightman.nospam.org> wrote in message
news:Gpv72r.1E1@lugnet.com...
> 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:
 | | Re: Help! Hanyboard Assembly Testing problem!
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| Sam, can you check the serial input circuit. if this is not correct, then the 6811 won't stay in boot mode. make sure RP4 is a 1Kx4 resistor pack (4 discrete resistors) and not a 1Kx7. also make sure R15 is installed. see (URL) . also, try putting (...) (23 years ago, 15-Jan-02, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: Help! Hanyboard Assembly Testing problem!
|
| 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 (...) (23 years ago, 13-Jan-02, to lugnet.robotics.handyboard)
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