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those two things together strongly suggest that your crystal isn't
running. any chance you can get a scope or logic probe to verify this
-- measure the E clock output of the 'hc11 (pin 5).
also, check that you've properly installed a 2.2 megaohm resistor for
the one that goes across the crystal.
if you're using a crystal (2 leads) and NOT the ceramic resonator (3
leads), make sure the associated 22pF caps are installed. contrarily,
if you're using the resonator, make sure the caps are NOT installed.
other than that, could be a bad hc11, but much more likely it's the
above or a bad xtal/resonator.
f.
In your message you said:
> i'm assembling the handyboard according to the instructions found on the
> HB site. When measuring the E clock signal using a voltmeter, i register
> 5V instead to the anticipated 2.5V. i've re-checked all the solder joints
> but there doesn't appear to be any problems. and also, the green power
> LED continuously stays lighted even when trying to put the HB into
> download mode.
> any suggestions?
> thanks for any help provided.
>
> /"""""""""""""""""""""""""""""""""""""\
> Pat Leang
> Mechanical Engineering
> University of California, Riverside
>
> """""""""""""""""""""""""""""""""""""""
>
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Message is in Reply To:
 | | 5V of trouble
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| i'm assembling the handyboard according to the instructions found on the HB site. When measuring the E clock signal using a voltmeter, i register 5V instead to the anticipated 2.5V. i've re-checked all the solder joints but there doesn't appear to (...) (25 years ago, 6-Apr-00, to lugnet.robotics.handyboard)
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