Scanning Z Axis Probe Issue

[ash100]

I originally had the Z axis probe outputting garbage values to the mainboard 6HC but now it stopped working and it only reads 0. I have attached the config file.

My setup is: I have a Mainboard 6HC connected to a Revo Roto TDB on which is a scanning Z axis SZP probe.

; Configuration file for RepRapFirmware on Duet 3 Main Board 6HC
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.5.10 on Sun Jan 19 2025 10:10:54 GMT-0800 (Pacific Standard Time)

; General
G90 ; absolute coordinates
M83 ; relative extruder moves
M550 P"5axis" ; set hostname
G4 S2

; Smart Drivers
M569 P70.0 S0 R1; driver 0.0 goes forwards (X axis)
M569.1 P70.0 T3 R100 I0
M569 P70.0 D4

;M569 P71.0 S1 D2 ; driver 0.1 goes forwards (Y axis)
M569 P71.0 S0 R1; driver 0.0 goes forwards (X axis)
M569.1 P71.0 T3 R100 I0
M569 P71.0 D4

;M569 P72.0 S1 D2 ; driver 0.2 goes forwards (Z axis)
M569 P72.0 S0 R1; driver 0.0 goes forwards (X axis)
M569.1 P72.0 T3 R100 I0
M569 P72.0 D4

;M569 P73.0 S1 D2 ; driver 0.4 goes forwards (U axis)
M569 P73.0 S0 R1; driver 0.0 goes forward s (X axis)
M569.1 P73.0 T3 R100 I0
M569 P73.0 D4

;M569 P74.0 S1 D2 ; driver 0.5 goes forwards (V axis)
M569 P74.0 S0 R1; driver 0.0 goes forwards (X axis)
M569.1 P74.0 T3 R100 I0
M569 P74.0 D4


; Axes
M584 X70.0 Y71.0 Z72.0 U73.0 V74.0 E75.0 ; set axis mapping
M350 X16 Y16 Z16 U16 V16 I1 ; configure microstepping with interpolation
M92 X640 Y640 Z1969.230 U800 V27.350 ; configure steps per mm
M906 X1500 Y1500 Z1500 U1500 V1500 ; set axis driver currents
M208 X0:1000 Y0:820 Z0:210 U-20:100 V-999:999 ; set minimum and maximum axis limits
M566 X500 Y500 Z500 U500 V1000 ; set maximum instantaneous speed changes (mm/min)
M203 X1500 Y1500 Z500 U500 V2000 ; set maximum speeds (mm/min)
M201 X500 Y500 Z500 U500 V1000 ; set accelerations (mm/s^2)

; Kinematics
;M669 K8 ; configure CoreXYUV kinematics

; Endstops
M574 X1 P"!io3.in" S1 ; configure X axis endstop
M574 Y1 P"!io0.in" S1 ; configure Y axis endstop
M574 Z2 P"!io7.in" S1 ; configure Z axis endstop
M574 U0 ; configure U axis endstop
M574 V0 ; configure V axis endstop

G92 V0 ; set V axis to zero upon startup
G92 U0 ; set V axis to zero upon startup

; Extruder
M350 E16 I1 ; configure microstepping with interpolation
M906 E900  ; set extruder driver currents
M92 E2682   ; configure steps per mm
M566 E120   ; set maximum instantaneous speed changes (mm/min)
M203 E3600  ; set maximum speeds (mm/min)  
M201 E250   ; set accelerations (mm/s^2)

;Nozzle Temperature
M308 S1 P"75.temp1" Y"thermistor" A"Nozzle" T100000 B4267 C7.06e-8 ; configure sensor #1
M950 H1 C"75.out0" T1 ; create heater #1 hotend heater
M143 H1 P0 S275 A0
M143 H1 P1 S285 A2
M307 H1 R4.663 K0.549:0.000 D1.95 E1.35 S1.00 B0


; Scanning Z Probe
M558 P11 C"75.i2c.ldc1612" F36000 T36000
M308 A"SZP coil" S10 Y"thermistor" P"75.temp2" ; thermistor on coil
G31 Z2 X302 Y245
; M558.2 K0 S13 R142607
M557 X292:312 Y235:255 P10

; M558.1 K0 A-3.798e-4 B-2.723e-9 C3.136e-15

[dc42]

@ash100 if it read zero, that suggests that the connection between the coil and the control board is broken.

[ash100]

@dc42 I tried a different probe, checked the continuity connection on the ribbon cable, and tried a different ribbon cable as well, it didn't change anything. I believe this device stopped working only when I was working on trying to setup a 2D mesh scan.

[dc42]

@ash100 I suggest you get a diagnostic report on the tool board by sending M122 B75 and post the result here.