[Solved] Card reading intermittent issues
Posted: Sun Jan 27, 2019 6:43 pm
Hello,
LCD is consistent with your SD card insertion / removal (meaning insertion SWITCH + PIN assignment are OK) BUT the content of the SD card is erratic, there are potentially 3 possible issues :
1. Card is defective. Does not happen so often, but still check that you formatted it in FAT32 and that the amount of entries is limited (below 10) and card is not full (there are no CRC on GCODE, meaning that a partial GCODE file will not be detected by the printer, it will just stop printing, no error)
2. SD flat cable is very close to the thermal dissipator (board side). Flat cable are not shielded by design and thermal dissipator are sticked on component which could create eletrical field/noise. Reroute the cable and check if it is solved. Same issue could happen for the display (other flat cable). Same solution will help to limit the issues with display filled with scramble caracters.
3. Power supply is generating noise on secondary (12 V) circuit. Seems to be strange but still logical. Most of the time, SD content is displayed well but when you turn the knob, list is becoming empty. It could also be during the print, vertical or horzontal draw line appears in an unexpected way. Replacing the power supply cursed both issues in my case. Did I was lucky ? No idea
Hope it helps
Thierry
LCD is consistent with your SD card insertion / removal (meaning insertion SWITCH + PIN assignment are OK) BUT the content of the SD card is erratic, there are potentially 3 possible issues :
1. Card is defective. Does not happen so often, but still check that you formatted it in FAT32 and that the amount of entries is limited (below 10) and card is not full (there are no CRC on GCODE, meaning that a partial GCODE file will not be detected by the printer, it will just stop printing, no error)
2. SD flat cable is very close to the thermal dissipator (board side). Flat cable are not shielded by design and thermal dissipator are sticked on component which could create eletrical field/noise. Reroute the cable and check if it is solved. Same issue could happen for the display (other flat cable). Same solution will help to limit the issues with display filled with scramble caracters.
3. Power supply is generating noise on secondary (12 V) circuit. Seems to be strange but still logical. Most of the time, SD content is displayed well but when you turn the knob, list is becoming empty. It could also be during the print, vertical or horzontal draw line appears in an unexpected way. Replacing the power supply cursed both issues in my case. Did I was lucky ? No idea
Hope it helps
Thierry
Thanks for your share.