Ramps 1.4 and Marlin - D8 and D9 Linked

Hello,

Have a bit of an issue with my ramps setup after updating firmware.

If I turn my cooling fan on (via D9) or turn my heated bed on (D8) the other pin will also turn on. Its almost as if they are linked.

I have check and I am using the EFB motherboard config in marlin, pins.h is referring to the right board, and in the ramps.h the D8 refers to 8, D9 to 9. The FAN_pin also points to D9 and the heat bed pin points to D8.

I have replaced my Ramps 1.4 board and replaced the MOSFETT. I do not think this is a hardware issue. The activity LEDS for D8 and D9 will light up when either is triggered in software.
I cannot see any loose wiring or issues on the board itself.

Can anyone help?

Many thanks

It appears that your configurations are good.

Normally I add MOSFET_D_PIN for E1 or FAN1_PIN

#ifndef MOSFET_D_PIN
  #define MOSFET_D_PIN      7 //This adds E1 or 2nd fan
#endif
#ifndef RAMPS_D8_PIN
  #define RAMPS_D8_PIN      8
#endif
#ifndef RAMPS_D9_PIN
  #define RAMPS_D9_PIN      9
#endif
#ifndef RAMPS_D10_PIN
  #define RAMPS_D10_PIN    10
#endif

Do you have to Original source code, can you post the Configuration.h, Configuration_adv.h and pins_RAMPS.h for the working original firmware I will look see what happened.

Edited 1 time(s). Last edit at 05/03/2022 11:34PM by Roberts_Clif.

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Computer Programmer / Electronics Technician

Hi,

I feel like a right idiot, it was a hardware issue after all!

The top of the fan mosfet was leaning over and touching the heatbed mosfett, I have leant it back and everything is fine, thanks for all the reply!

I hate it stuff like that happens, my controller had a line on mosfets
I placed a piece if bar aluminum connecting the mosfets with TO220 kits Photos below

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Computer Programmer / Electronics Technician