Unresponsive Printer

This guide covers how to diagnose and fix a Vision Miner 22 IDEX V4 that will not start, does not respond to commands, or shows a "VIN is not in range" error. The two most common causes are a blown fuse on the mainboard and a corrupted micro-SD card that prevents the controller from booting.

Work through the diagnostic steps in order: check power delivery first, then inspect fuses. Only move to SD card recovery if the board is powered but unresponsive.

Tools and Materials

• Multimeter with continuity/beep mode
• 15A replacement fuses (�2)
• Micro-SD card reader
• Needle-nose pliers or fuse puller
• Anti-static wrist strap (recommended)

1. Checking Power Supply LEDs

Before opening anything, verify that power is reaching the electronics. The Vision Miner 22 IDEX V4 has two power supplies and three solid-state relays (SSRs) on the right side of the electronics bay.

1. Turn off the printer.
2. Open both rear doors of the enclosure to access the electronics bay.

3. Power the printer on.
4. Look at the right side of the electronics bay. You should see three LEDs:

5. If any of these three LEDs is missing, the problem is upstream of the mainboard � check the mains cable, the power inlet connector, and the SSR connections. See the Wiring Schematic for reference.
6. If all three LEDs are lit, continue to the next section.

2. Checking Mainboard and Expansion Board LEDs

The mainboard (Duet 3 MB 6HC) and expansion board (Duet 3 EXP3HC) are on the left side of the electronics bay. Each board has diagnostic LEDs that show which voltage rails are active.

7. Look at the mainboard (upper board on the left side). Check the power indicator LEDs in the upper-right area of the board:

8. Also check the STATUS LED on the mainboard:

9. Check the expansion board (lower board on the left side). It has the same set of power indicator LEDs � blue (24V), red (5V), green (3.3V), amber (12V). When connected to a running mainboard, the expansion board's diagnostic LED will blink in sync with the mainboard STATUS LED.

10. Interpret the results:
    • Blue (24V) LED is off on the mainboard, but the 24V PSU LED is green ? the V_FUSED fuse is likely blown. Go to Section 3.
    • All power LEDs are correct, STATUS LED flashes steadily, but the Web Interface does not load ? check your network connection first. The printer may be in Wi-Fi Access Point mode (SSID: 22 IDEX).
    • All power LEDs are correct, but STATUS LED is dim/off or flashing 3� ? the firmware is missing or corrupt. Go to Section 4.

3. Checking and Replacing Fuses

The Duet 3 MB 6HC mainboard has two user-serviceable fuses:

A blown V_FUSED fuse cuts power to the motor drivers and most circuits on the board. This is the most common cause of the "VIN is not in range" error and non-responsive X/Y axes.

Possible cause: tangled filament on the spool stalls an extruder motor. The stalled motor draws excessive current, overloads the circuit, and blows the V_FUSED fuse. This is especially common with rigid high-temperature filaments (PEEK, PEI, PEKK) that tend to unwind and tangle.

11. Turn off the printer and unplug it from the power outlet.
12. Locate the two fuses on the mainboard.

13. Test each fuse with a multimeter set to continuity mode. Place one probe on each end of the fuse:

• Continuous beep � fuse is good.
• No beep (silence) � fuse is blown.

14. Alternative visual check: remove the fuse with needle-nose pliers and inspect the wire element inside. A break or dark discoloration means the fuse has blown.

15. Replace any blown fuse with an identical 15A fuse.

16. Reconnect power and turn on the printer.
17. If the printer powers on and axes respond � the issue is resolved. Before resuming printing, fix the original cause of the overload (e.g., seized motors). If you cannot identify the cause, contact technical support.
18. If the printer still does not respond after replacing the fuse � continue to the next section.

4. Recovering a Corrupted SD Card

If fuses are intact and all board LEDs look correct, but the printer does not boot (STATUS LED is dim, off, or flashing 3�), the micro-SD card holding the firmware and configuration may be corrupted.

19. Turn off the printer and unplug it from the power outlet.
20. Locate and remove the micro-SD card from the mainboard.

21. Insert the card into a computer using a micro-SD card reader.

22. Check the card contents:
    • No files visible, or files with random/garbled names ? the file system is corrupted. Continue with the recovery steps below.
    • Card is not recognized by the computer at all ? try a different card reader. If it still fails, you may need a new micro-SD card.
    • Files look normal ? the card is likely fine. Go back and recheck the fuses and board LEDs.

5. Backing Up and Reformatting the SD Card

23. If any files are visible on the card, copy them to a backup folder on your computer. Even partially readable files may contain custom calibration data.
24. Format the SD card as FAT32 using your OS formatting tool (Disk Management on Windows, Disk Utility on macOS).

6. Downloading and Installing Firmware

25. Download the correct firmware package for your printer version. Each package contains the complete SD card folder structure:

26. Extract the downloaded ZIP file.
27. Copy all extracted folders to the root of the freshly formatted SD card. The required folders are: sys, filaments, user, macros, gcodes, firmware.

7. Reinserting the SD Card and First Boot

28. Safely eject the SD card from the computer.
29. Insert the SD card into the mainboard's micro-SD slot.
30. Plug in and power on the printer.
31. With a fresh firmware image, the printer starts in factory configuration � no network settings are saved. It boots into Wi-Fi Access Point mode, broadcasting an SSID named 22 IDEX.
32. Connect to the 22 IDEX Wi-Fi network from your computer or phone and open a browser to access the Web Interface. If the interface loads, the firmware is running and the SD card recovery was successful.

8. Restoring Configuration After Recovery

33. Configure networking. Connect the printer to your local Wi-Fi or Ethernet network. See the network setup guide for your printer version.

34. Verify firmware versions. In the Web Interface, go to the Machine-Specific tab and check that the firmware versions for Duet 3 MB6HC, Duet 3 Expansion EXP3HC, and Duet Web Control are up to date and match.

35. If the expansion board firmware version does not match the mainboard:

    • Go to the System tab in the Web Interface.
    • Open the dropdown menu and navigate to Firmware Directory.
    • Right-click on the file Duet3Firmware_EXP3HC and select Install Firmware File.

36. If the Web Control version does not match � refresh the browser page. The updated version loads automatically from the SD card.

37. Flash mainboard and Wi-Fi firmware. Open the Console in the Web Interface and send:

M997 S0:1

This command flashes both the mainboard MCU firmware (S0) and the Wi-Fi module firmware (S1). The printer reboots automatically when the update completes.

38. After the reboot, verify all firmware versions again (step 34) to confirm everything matches.
39. Run Auto-Calibration. A fresh firmware install resets all calibration data � tool offsets, Z-probe position, and mesh bed compensation are gone. Run the full Auto-Calibration procedure to restore them.

FAQ

What causes the "VIN is not in range" error?

The mainboard monitors input voltage on the VIN rail. When voltage drops below the expected range � typically because the V_FUSED fuse has blown � it reports "VIN is not in range." Replacing the blown fuse resolves this error.

Can a tangled filament spool blow a fuse?

Yes. When filament tangles on the spool, the extruder motor stalls trying to pull material that won't feed. A stalled stepper motor draws significantly more current than during normal operation. If the overcurrent persists, the V_FUSED fuse blows to protect the board. This is especially common with rigid high-temperature filaments like PEEK, PEI, and PEKK � they tend to spring off the spool and cross over other wraps.

How do I prevent filament tangles?

Always clip or secure the free end of the filament to the spool after unloading. Rigid materials (PEEK, PEI, PEKK) are stiff enough to unwind on their own. Make sure the tip is firmly fixed every time you remove the spool from the printer.

Will I lose my calibration data after an SD card recovery?

Yes. Reformatting the SD card erases all calibration values, mesh bed compensation, tool offsets, and network settings. You will need to reconfigure the network and run the full auto-calibration procedure from scratch.

Can I cancel the firmware flash (M997) mid-process?

No. Interrupting a firmware flash can leave the mainboard in an unbootable state. If the flash is interrupted accidentally, you may need to recover using the BOSSA utility � contact Vision Miner support for assistance.

The printer has power and LEDs look normal, but the Web Interface doesn't load.

If board LEDs are correct and the STATUS LED is flashing steadily, the firmware is running. The issue is likely network-related:

• Check that the printer and your computer are on the same network.
• If the SD card was recently replaced, the printer has no saved network � it will be in Wi-Fi Access Point mode. Look for the 22 IDEX SSID.
• Try connecting via USB and accessing the Web Interface at 192.168.0.1 if network configuration is not possible.

Troubleshooting

• Issue: Blue (24V) LED is off on the mainboard, but the 24V PSU green LED is on.
• Cause: Blown V_FUSED fuse on the mainboard.
• Solution: Test and replace the V_FUSED fuse with a 15A replacement. See Section 3.

• Issue: No LEDs on either power supply when the printer is turned on.
• Cause: No mains power reaching the PSUs � faulty power cable, tripped breaker, or damaged power inlet connector.
• Solution: Check the mains cable, wall outlet, and power inlet on the printer. Try a known-good power cable.

• Issue: STATUS LED flashes 3� then goes off.
• Cause: Firmware on the SD card failed its CRC integrity check � the file is corrupted.
• Solution: Recover the SD card following Section 4 through Section 8.

• Issue: After SD card recovery, the expansion board firmware version does not match the mainboard.
• Cause: The firmware package may include a newer mainboard firmware than what was already on the expansion board.
• Solution: Install the expansion board firmware through the Web Interface (step 35), then flash the mainboard with M997 S0:1 (step 37).

Support

If you could not find an answer here, reach out to our support team.