ColorCNC Colorlight 5A-75E/5A-75B as FPGA controller board

juergenmoser wrote:

Hi muvideo,

okay thanks - i connected a stepper and i was wondering why it‘s not moving. I tried all axes/joints. (Card enabled and ready)So i will try to modify the home latching etc. all to zero. 
Thanks  all for the help!

The homing configuration should not block the motor from moving, maybe there Is something else not working in your case. You say that the board Is enabled, have you double checked the board pinout?
Verify that you are connecting the stepper driver to the right pins. Do you have means to check if a pin Is driven? (Dvm or scope)

Yes i’ve watched the output now with an scope. So there is something going on. Maybe my stepper stepper driver is not working… i‘ve connected to J1 Pin 1 and 2 to the stepper driver and ground(pin 4) board 7a75b v8.1

Happy new year!

I have found 74LVC245A .. which old buffers to remove ? are all the same ?
U15/U12/U38/U20 are ok to replace ?
Exists some photo to show which buffer are connected to each idc16 connector ?

For the 5A-75E version 6 and 8, you can find which buffers to replace at  Chubby75 git repository :

Transceivers U23,U24,U28 completely cover RGB pins on J1,J2,J3,J4Transceivers U25,U26,U27 completely cover RGB pins on J5,J6,J7,J8Transceivers U14,U16,U18 completely cover RGB pins on J9,J10,J11,J12Transceivers U9,U12,U15 completely cover RGB pins on J13,J14,J15,J16

I do not recommend to replace the buffers for the shared pins. Each IDC connector has their own buffer, so this would lead to have them all replaced. 

which pins are shared ?
Must replace U23,U24,U28 U25,U26,U27 U14,U16,U18 U9,U12,U15 ?
or can replace only U23,U24,U28 for convert J1,J2,J3,J4 to inputs ?
Hot air works for desoldering or it is more safe to cut legs of old buffers ?

vre wrote:

which pins are shared ?

​​​​​Pons 1, 2  3, 5, 6 and 7 are individual pins. Pin 4 and 16 are ground. The remainder of the pins are shared pins. Of these shared pins, pin 8 (E) is special, as in some displays this one is connected to ground. 

Must replace U23,U24,U28 U25,U26,U27 U14,U16,U18 U9,U12,U15 ?
or can replace only U23,U24,U28 for convert J1,J2,J3,J4 to inputs ?

It will suffice to replace only U23, U24 and U28 in this case. When using mij  breakout boards  I recommend to replace the buffers in groups of 3 to prevent 'wasted' pins. 

Hot air works for desoldering or it is more safe to cut legs of old buffers ?

I do have a hot air station. My experience with using this to desolder buffers is not good, pads are coming loose from the board. This might also be due to my lack of skill. 

With cutting the legs I've never had any problem, so I deem this method safer.