MDJ-900, MDJ-1000 – general troubleshooting

Whether you’re spinning in USB, MIDI, or HID mode, the MDJ-900 and MDJ-1000 are designed for seamless DJ performance. If something isn’t working as expected, follow these troubleshooting steps.

USB Storage Device Not Working or Error Messages Displayed

Make sure the USB drive is fully inserted into the port.
Do not use USB hubs—these models will not operate properly when a hub is connected.
If you see “ERR E-1006 Too many devices,” disconnect any hub and connect the USB drive directly.
If “ERR E-1003 Media error” appears, the storage device is formatted incorrectly. Re-format it using a supported file system (FAT, FAT32, HFS+, or NTFS).
Always back up data before connecting any USB device.
For “ERR E-1001 Bad Update,” “ERR E-1004 Unsupported file format,” or “ERR E-1007 Incorrect processing,” contact Gemini Support.

Computer Does Not Recognize the Device (MIDI / HID / Audio Connection Issues)

Power the unit off, then reboot your computer.
Make sure you’re using the latest version of your DJ software.
If the MDJ-900 or MDJ-1000 mapping does not appear in your software list, visit Gemini Support for the latest drivers or firmware updates.
For HID mode, ensure your DJ software supports HID devices and disable MIDI devices in software preferences if prompted.

Firmware or Software Out-of-Date (General Performance Issues)

Confirm that your MDJ-900 or MDJ-1000 is running the latest firmware.
Visit support.geminisound.com for the most current firmware files and installation steps.
Do not use the old Gemini Updater utility, as it is no longer supported.

Unsupported File Format or Media Compatibility Error

If “Unsupported file format” appears on the display, the file type cannot be read by the unit.
Verify that the track is encoded in a supported format (WAV, AIFF, MP3, AAC).
Replace or re-encode unsupported files before attempting playback again.

Related Articles:

Need More Help?

If you’ve tried the steps above and still need assistance, contact Gemini Support:

Phone: 732-346-0061
Email: support@geminisound.com
Web: support.geminisound.com