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• To return a Samsung SCX-3405 / SCX-3405W / SCX-3405FW to its original factory settings, use one of the following four procedures (simplest first):
Why a factory reset?
• Removes corrupted network parameters, language/region mismatches, stuck error flags after paper jams, etc.
• It does not alter or downgrade firmware; code V3.00.02.05 or later remains installed.
Method 1 – Control-panel menu (recommended for 90 % of cases):
• Works on any model with an LCD.
• Requires neither password nor special tools.
• Keeps the service page counter and consumable counters intact; only user preferences are erased.
Method 2 – Hard-key reset (no display needed):
• Useful when the LCD is blank or the menu is locked by an unknown password.
• Performs an “All Settings” clear including wireless SSID/passphrase.
Method 3 – SyncThru Web reset:
• Offers a GUI and confirmation dialog.
• Needs the printer on the LAN and admin credentials (default “admin / sec00000” or blank).
Method 4 – Tech/NVRAM clear (service-level):
• Clears non-volatile RAM (calibration data, error logs, some counters).
• Should be the last resort; wrong selections here can disable region coding or consumable information.
• After completion the machine may prompt again for language, paper size default, date/clock.
After any reset you must re-enter:
• Wi-Fi SSID & password or static IP.
• Scan-to-PC/Email destinations.
• Fax numbers (FW model).
• Custom paper types or energy-save timers.
• Firmware V3.00.02.05 (released just before Samsung’s printer division was acquired by HP) is reported on forums (Elektroda, Samsung Community EU, Feb 2022 posts) to brick some units after incomplete update. A factory reset alone will not solve that; recovery requires a forced re-flash via USB-serial jig or service utility, which is only distributed to authorised centres.
• HP stopped publishing new SCX-340x firmware; the product is in “End of Service Life” (EOSL). Community solutions therefore focus on downgrading to V3.00.01.xx or using patched firmware to unlock the bootloader.
• Difference between “All Settings reset” and “NVRAM clear”: the first clears user profile stored in EEPROM; the second additionally wipes calibration constants stored in onboard FRAM.
• Stop/Clear vs Cancel: Older SCX-3400 panels are labelled “Cancel”; Wi-Fi variants add a WPS key—holding both (Cancel+WPS) calls the same ISR routine that initiates sys_init(FACTORY).
Example scenario
(1) Printer shows steady green LED but LCD frozen after update → Power cycle → still locked.
(2) Hard-key reset → LEDs change pattern but lock up again.
(3) Enter Tech mode, Clear All Mem → unit returns to “Ready” → re-enter network credentials.
• Firmware images found on unofficial sites may be copyrighted HP IP; distributing or using modified code may violate EULA and local copyright law.
• Service-mode counters (toner, fuser) are part of CE/UL safety compliance; forcing them to zero without replacing the part could void certification and create a fire risk.
• Always print a “Configuration Report” before reset (Menu ➜ Reports ➜ Config); it documents MAC address, serial, and custom SMTP settings.
• After reset, update the driver port on PCs if the printer’s IP changes.
• If the machine does not accept the Tech-mode key sequence, slow the key presses (≥0.3 s each) or power-cycle and retry; timing is strict.
• Factory reset will not repair hardware faults (laser scanner noise, pickup-roller wear).
• On some early units the service key sequence is Menu # 1 9 3 4 OK instead of Menu repetition; consult service manual revision K.
• Units with broken control panels require a USB-only emergency firmware-download mode; that process is outside the scope of standard user maintenance.
• Monitor community threads on Elektroda and Reddit r/printers for patched firmware that bypasses the V3.00.02.05 boot loop.
• Investigate HP Smart Device Services (SDS) which can push configuration backups to older Samsung models.
• Study the Service Manual (part code JC92-02617A) — chapter 6 covers DC-controller and NVRAM operations.
Resetting an SCX-3405 to factory defaults can be done from the front panel menu, a hard-key combination, the SyncThru web interface, or—in severe cases—through the hidden Tech mode that clears NVRAM. The reset erases user and network settings but leaves the installed firmware intact; if problems began after firmware V3.00.02.05, a separate firmware recovery is required. Always back up settings beforehand and re-enter network credentials afterwards.
