Oh Wow. That was quick. Thanks for coming back to me and pointing me in the right direction. @carefudundae
I tried to do a bit of reading to find out possible solutions. So far my sanity checks are below. I haven't sourced the issue yet. I am not electrically minded but have some experience. This is my first time usign a forum like this so I am not sure how much information is required. So I will try to be thorough.
Printer: FT-5 R2 24V
History: First time I switched on the power supply, it fried itself (wired as per the latest manual). I assume it was a dudd from the factory. I replaced it with a "Meanwell RSP-500-24" power supply.
Both thermocouples (TC's) not registering a temperature.
Bed temperature shown as 40--45C on Repetier. Extruder 1 Temperature showing as 357.5C. Throughout my testing neither of the values have changed on the LCD or on the manual control view on repetier. The bed did heat up a little before triggering a High Temp error. The extruder has never heated up but has triggered errors for not reaching temperature after a set time.
Checked both the Bed and Extruder TC's
- Resistance measured at approximately 100 ohms for each TC.
- Wires removed & checked for breaks or shorts (visually).Then multimeter continuity test. All seems ok.
- Held the tip of the TC's between my fingers and the resistance of both dropped as expected.
- Switched the connections around on the board to see if that would change anything. Still no response from the TC's.
- I even tried applying a little (light) pressure to the connector in case it had come loose from the board. No change in the temperatures shown.
- Continuity test on the 2 pin connections where the TC's attach to the board. all still ok. No power from USB or Mains. i.e. no beep when the multimeter probes are touching each of the 2 pins. The TC is connected during this.
- Continuity test when USB plugged in. All still ok. No beep across the 2 pins. The TC is connected during this.
- Continuity test when USB & Mains power on Failed. BEEP. Now I am confused. Why would this be the case?
Inspected the MKS Gen 1.4 Board
1. No smells of fried components
2. No scorch marks
3. No visible shoddy soldering or loose metal fibers bridging any connections.
4. Board cleaned with compressed air to make sure.
I also checked all of the wiring/connections. Checked the wire loom for breakages and the power supply for shorts or loose connections.
I also checked the heated bed and the cartridge heater for the extruder. These both beep when I check continuity which I assume is correct as they are basically just a large resistance that will heat up?
I am stumped. Any ideas on where to go now would be really appreciated.