Hi All
I have just finished putting together my K8055 and tested it. I have ran the Demo program and all of the outputs seem to be working fine. I just have 2 issues, The power LED doesn’t switch on and Input 5 seems to be on permenantlyI have checked my soldering and everthing seems to be fine. Can you assist in letting me know what to check next.
[quote]The power LED doesn’t switch on and Input 5 seems to be on permenantly[/quote]Maybe wrong LED polarity.
If you have a multimeter you can check the voltage on the digital input terminal I5 to GND.
The voltage should be about 1.7V (same as on terminals I1…I4 to GND).
If not, then there is either solder bridge or some other assembly problem on the board.
If the input voltage is OK, then you have to check the voltage on pin 14 of IC2.
Should be about 0.6V.
Should be about 5V when the input test button SW5 “Inp5” is pressed down.