Subject:
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Re: Smoking serial/charger board...!!!
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 24 Jul 1997 12:52:32 GMT
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Original-From:
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Fred G. Martin <fredm@mediaSAYNOTOSPAM.mit.edu>
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Viewed:
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1324 times
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make sure you have a telephone-style and not network-style RJ11 cable.
Here is how you tell if you have a telephone-style or network-style
RJ11 cable. Hold the two ends together, metal contact side up, as if
you were trying to plug them into each other.
Then look at the wiring colors. On a telephone cable, each color
should line up with itself on the other end.
On a network cable, the colors are inverted.
See the diagrams for clarification. Again, please, please, PLEASE!
be careful about this and do not use network cables with your Handy
Board.
-Fred
TELEPHONE STYLE WIRING
+---------------+ +---------------+
--------+ yellow =======+ +======= yellow +--------
+ green =======+ +======= green +
+ red =======+ +======= red +
--------+ black =======+ +======= black +--------
+---------------+ +---------------+
NETWORK STYLE WIRING
+---------------+ +---------------+
--------+ yellow =======+ +======= black +--------
+ green =======+ +======= red +
+ red =======+ +======= green +
--------+ black =======+ +======= yellow +--------
+---------------+ +---------------+
In your message you said:
>
> Well,
>
> Today I dig up my handyboard which was working fine with the serial/sharger
> board and all the last time I used it a few months ago.
>
> After a fresh overnight NiCd charge using the onboad power connector
> (i.e. not using the serial/charger board), I thought I would play with
> it a bit. That's when the fun started...
>
> Upon plugging in the telephone cord between the handyboard and serial/charger
> board, R11 started to turn darker and literally started smoking... By the tim • e
> I got around to disconnecting the cord, R12 and LED14 have started to do the
> same. I guess that R11(47 Ohms 1/2W) burnt out causing a domino effect on
> R12(47 Ohms 1/8W)...
>
> My question is, does anyone know why it's doing this? Right before I shelfed
> it couple month ago, I made the modification for using less than 9.6V motor
> (per instruction on the handyboard homepage). But, all was working fine
> after that (at least I thought so)... I should mention that the two motor
> driver sockets are empty because I'm still waiting for my TI 754410 (and
> have been for 2 months)...
>
> I have just replaced R11 & R12 and I thought I should ask before I try
> again... Any clue would be appreciated... Voltage across pin 3 & 4 of the
> modular socket on the handyboard read 10.2V. The charge rate switch was
> at normal.
>
> TNX
>
> --Ron
>
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Message is in Reply To:
 | | Smoking serial/charger board...!!!
|
| Well, Today I dig up my handyboard which was working fine with the serial/sharger board and all the last time I used it a few months ago. After a fresh overnight NiCd charge using the onboad power connector (i.e. not using the serial/charger board), (...) (27 years ago, 24-Jul-97, to lugnet.robotics.handyboard)
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