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AuthorTopic: CDTV keyboard issues  (Read 1247 times)

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Offline Pat the Cat

Re: CDTV keyboard issues
« Reply #15 on: February 26, 2021, 08:06:33 AM »
Oh hang on a minute - the +5V is going to take the path of least resistance, ie the RP6 resistor pack.

You will HAVE to remove it for testing with conventional resistors, which is going to mess up other pull signals on RP6.

Wait for replacement. I'm 95% sure a new resistor pack will fix it.
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Offline hishamk

Re: CDTV keyboard issues
« Reply #16 on: March 18, 2021, 08:17:03 PM »
So I replaced the 10k resistor pack and also the 10uf 50v cap by the keyboard port (the old one was fine though). Still no joy, exactly the same behavior.
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Offline Pat the Cat

Re: CDTV keyboard issues
« Reply #17 on: March 18, 2021, 08:24:26 PM »
Quote from: hishamk on February 26, 2021, 07:50:49 AM
It looks like it's RP6. The resistance is pretty shot for 40 and 39 against +5V. It's around 2 ohm.



Is that still the case, pins 39 and 40 shorted to 5 volts with next to no resistance? Take the chip out, then measure with keyboard connected and unconnected.

EDIT: There has to be something shorting those pins out either to 5V or to 0V. It could be the lead after all... but you did check for no shorts between any of the pins.
« Last Edit: March 18, 2021, 09:01:56 PM by Pat the Cat »
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"To recurse is human. To iterate, divine."

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