re checked input pin with 1k resistor with reference to grd
volts output from BOB 5.12v (
volts @ input pin with I k resistor 2.16v

Hi Dale
If a 1k pull-up resistor only gets the input to 2.16 volts, then I think the chip is almost certainly damaged - sort of lightly toasted. Next step is to replace it. Worth having some spare parts anyhow.

Cheers
Roger

Hi Roger,

Thanks for your help, much appreciated. I'll get the repair kit from cnc4pc, it will probably take a couple of weeks to arrive here in the UK. I post my results when the new IC's arrive.

Kind regards

Dale Gribble

I'll get the repair kit from cnc4pc, it will probably take a couple of weeks to arrive here in the UK. I post my results when the new IC's arrive.

Hi Dale - if you can photo the top of the chips I might be able to figure out what they are, and maybe you could buy a couple locally - RS Components or similar in the UK.

Cheers
Roger

Hi roger,

Thanks for your offer on identifying the chips, I ordered the repair kit from CNC4PC at a very reasonable price of $9.

Regards

Dale