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AuthorTopic: CDTV keyboard issues  (Read 2148 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.
"To recurse is human. To iterate, divine."

A1200, Vanilla, Surf Squirrel, SD Card, KS 3.0/3.z, PCMCIA dev
A500, Vanilla, A570, Rev 5, KS 1.2/1.3 Testbench system
Rasp Pi, UAE4ARM, 3D laser scanner, experimental, hoping for AmigaOS4Arm, based on Watterott Fabscan Pi
 

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.
2x A1000, 2x A2000, 1x A3000, 2x A1200, 2x A500, 1x CDTV, 1x CD32, 2x Pegasos II, 1x EFIKA
 

Offline Pat the Cat

Re: CDTV keyboard issues
« Reply #17 on: March 18, 2021, 08:24:26 PM »
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 »
"To recurse is human. To iterate, divine."

A1200, Vanilla, Surf Squirrel, SD Card, KS 3.0/3.z, PCMCIA dev
A500, Vanilla, A570, Rev 5, KS 1.2/1.3 Testbench system
Rasp Pi, UAE4ARM, 3D laser scanner, experimental, hoping for AmigaOS4Arm, based on Watterott Fabscan Pi