 | | Re: Help! Hanyboard Assembly Testing problem!
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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 (...) (23 years ago, 15-Jan-02, to lugnet.robotics.handyboard)
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| | 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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| | Re: Help! Hanyboard Assembly Testing problem!
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Hi, Thanks for your reply. RP4 has the part # 88102G, and adjacent pairs of pins have resistance of 1k (ie, 4 discrete resistors). Ok, Tell me if this sounds really strange... R15 is installed, but tested at about 1k ohms, not 47k. I remove the (...) (23 years ago, 16-Jan-02, to lugnet.robotics.handyboard)
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| | Re: Help! Hanyboard Assembly Testing problem!---I think solved!
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There was a very undetcible component-side solder bridge between pins 2 and 3 of RP4. I might not know until tomorrow when I can get a replacement for RP4 (apparently I'm not very good at desoldering, and I didn't see the bridge at all until I (...) (23 years ago, 16-Jan-02, to lugnet.robotics.handyboard)
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| | Re: Help! Hanyboard Assembly Testing problem!---I think solved!
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so there was a bridge between Rx and Tx! that would do it. let us know if things are working now. fred (...) (23 years ago, 16-Jan-02, to lugnet.robotics.handyboard)
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| | Re: Help! Hanyboard Assembly Testing problem!---I think solved!
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Hey! I've put in the memory, and the LCD screen, and I have interactive C running! Pretty cool that I can print messages to the screen. So problem solved! Anyone have some good instructions on how to properly desolder a part? I almost screwed up my (...) (23 years ago, 17-Jan-02, to lugnet.robotics.handyboard)
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