Wiring Schematic

Wiring schematic for the 22 IDEX V3 — mainboard and expansion board pinouts, motor drivers, endstops, Z-probe, heaters, fans and toolhead terminal blocks.

This article covers the complete wiring schematic of the Vision Miner 22IDEX V3. Use it as a reference when troubleshooting electrical connections, replacing components, or verifying wiring after maintenance. The printer uses two controller boards: a Duet 3 Mainboard 6HC (Board 0) and a Duet 3 Expansion 3HC (Board 1), connected via CAN-FD bus.

Before you begin - safety and risk

Read the Safety - Before You Begin article to understand the hazards involved in working on the Vision Miner 22IDEX V3 - including electrical, thermal, mechanical, and chemical risks. All procedures in this wiki are provided as recommendations only. By choosing to follow any procedure, you do so at your own risk.

HV Wiring Schematic

High-voltage (mains) wiring between the power supply, SSR (solid-state relay), and the main board. This section is for reference only – do not service mains wiring yourself.

High-voltage wiring schematic showing power supply, SSR, and main board mains connections.

Heads – Main Board Connections

Hotend heaters, temperature sensors, and extruder motors connect to the Duet 3 MB 6HC (Board 0). Both toolheads (Left / Tool 0 and Right / Tool 1) wire back to this board.

Toolhead wiring connections to the Duet 3 MB 6HC showing heater, temperature sensor, and extruder motor cables.

Z Motors – Expansion Board Connections

The three Z-axis leadscrews are driven by motors connected to the Duet 3 Expansion 3HC (Board 1). The expansion board communicates with the main board over CAN-FD.

Z-axis motor wiring to Duet 3 Expansion 3HC showing connections for all three leadscrews.

Motor	Driver	Position
Z Motor 1	1.0	Right leadscrew
Z Motor 2	1.1	Rear leadscrew
Z Motor 3	1.2	Left leadscrew

X/Y/U Motors

The XY motion system uses four motors on the main board. Two Y-axis motors run in parallel on a shared axis.

X/Y/U motor wiring diagram showing connections to the main board stepper drivers.

Motor	Driver	Function
X motor	0.2	Tool 0 (left toolhead) movement
U motor	0.3	Tool 1 (right toolhead) movement
Y motor #1	0.1	Y-axis (paired)
Y motor #2	0.4	Y-axis (paired)

Z-Probe

The Z-probe is connected to the expansion board (Board 1) via 1.io4.in. Probe deployment and retraction are controlled by a servo motor driven from out9 on the main board. An ESD protection output is configured on 1.out4.

Switches

Endstop switch wiring for all axes. All endstop switches connect to IO headers on the main board.

Switch	Pin	Type
X endstop	`io4.in`	Min endstop (S1)
U endstop	`io5.in`	Max endstop (S1)
Y endstop #1	`io1.in`	Min endstop (paired)
Y endstop #2	`io2.in`	Min endstop (paired)

Toolhead Wiring

Terminal block connections for both toolheads, including heater wires, temperature sensor wires, fan wires, and extruder motor cables.

Toolhead terminal block wiring showing heater, sensor, fan, and motor cable connections.

Main Board Pinout – Duet 3 MB 6HC (Board 0)

Complete pin assignment table for the main board. All pin names use RepRapFirmware notation.

Stepper Drivers

Connector	RRF Pin	Axis	Function
DRIVER_0	0.0	E0	Left extruder motor
DRIVER_1	0.1	Y	Y-axis motor #1
DRIVER_2	0.2	X	X-axis motor (Tool 0)
DRIVER_3	0.3	U	U-axis motor (Tool 1)
DRIVER_4	0.4	Y	Y-axis motor #2
DRIVER_5	0.5	E1	Right extruder motor

High / Medium Current Outputs

Connector	RRF Pin	Function	Details
OUT1	out1	Left hotend heater (H0)	PT1000 sensor on TEMP_0
OUT2	out2	Right hotend heater (H1)	PT1000 sensor on TEMP_1
OUT4	out4	Left hotend cooling fan (F2)	Thermostatic, activates at 70 °C
OUT5	out5	X print cooling fan (F3)	User-controlled
OUT7	out7	Right hotend cooling fan (F0)	Thermostatic, activates at 70 °C
OUT8	out8	U print cooling fan (F1)	User-controlled
OUT9	out9	Z-probe servo (S0)	50 Hz PWM

Temperature Sensors

Connector	RRF Pin	Function	Sensor Type
TEMP_0	temp0	Left hotend	PT1000
TEMP_1	temp1	Right hotend	PT1000

Input / Output

Connector	RRF Pin	Function
IO_1	`io1.in`	Y endstop #1
IO_2	`io2.in`	Y endstop #2
IO_4	`io4.in`	X endstop
IO_5	`io5.in`	U endstop

Power Control

Connector	RRF Pin	Function
EXT 5V	pson	Power supply on/off (M80/M81)

Jumpers

The pinout diagram above shows where each jumper header sits on the board and what its pins are. The table below adds the part the diagram cannot show: which pins the jumper bridges on the 22 IDEX. Always compare with the new board before powering it on after a replacement.

Jumper on the diagram	What it selects	Setting on the 22 IDEX
External 5V Select (above POWER IN)	Source of the 5V rail for the board	Jumper on the right-most and center pins (facing the board). See Main Board Replacement
OUT 4-6 voltage input (left edge)	Supply for the low-current fan outputs OUT4–OUT6: V_FUSED (24V) or 12V	Jumper on V_FUSED + V_OUTLC1 (24V fans)
OUT 7-9 voltage input (left edge)	Supply for OUT7–OUT9: V_FUSED (24V) or 12V	Jumper on V_FUSED + V_OUTLC2 (24V fans)
Erase (next to the SAM7E8E chip)	Erases the firmware when shorted	Open. Shorted only during Fallback Firmware Recovery (BOSSA)
RS485 EN Bypass (IO1.in), 10K Bypass for I2C (IO2.in)	Optional bypasses for IO1 / IO2	Open, not used on the 22 IDEX

Fan jumpers moved by mistake

The OUT 4-6 and OUT 7-9 jumpers are the ones you may borrow for the Erase step in the BOSSA procedure. If the hotend or part cooling fans stop working after that procedure, one of these jumpers went back onto the wrong pins. Power off and set them as in the table.

Expansion Board Pinout – Duet 3 EXP3HC (Board 1)

Complete pin assignment table for the expansion board, connected to the main board via CAN-FD (address 1).