What this means

The SC670 code means your printer's two main internal computers failed to communicate during startup. The controller board handles your commands and processes jobs. The engine board runs the mechanical parts. Since they did not sync up when you turned the machine on, the printer never reaches a ready state.

Do not look for an empty cartridge or a paper jam. This is not a physical block or a supply issue. The failure happens entirely inside the electronics. Power supply fluctuations interrupt the startup handshake between the boards. A loose internal ribbon cable blocks the signal, and firmware mismatches also trigger the error.

Common causes

  • Temporary communication glitch between system boards
  • Loose internal ribbon cable connection
  • Faulty controller board
  • Faulty engine board
  • Firmware corruption on the controller
  • Firmware corruption on the engine
  • Power supply voltage drop during boot
  • Interference from faulty external accessories

What to check first

  1. 1Turn off the main power switch
  2. 2Unplug the power cord from the wall outlet
  3. 3Wait at least ten seconds before reconnecting

Step-by-step fix

  1. 1

    Perform a hard power cycle

    Turn the printer off using the main switch, unplug it from the wall, wait sixty seconds, plug it back in, and turn it on.

    Do not plug the machine back in if you smell burning or notice smoke.

  2. 2

    Disconnect external cables

    Disconnect all network cables, telephone lines, and USB cables from the printer. Restart the machine to see if the error clears.

  3. 3

    Bypass surge protectors

    Plug the printer directly into a known good wall outlet, bypassing any power strips, UPS units, or extension cords.

  4. 4

    Check accessory connections

    Ensure any accessible optional paper trays or external finishers are securely attached and locked into place.

  5. 5

    Drain residual power

    Unplug the machine from the wall and press and hold the power button for thirty seconds to discharge any remaining electrical charge.

  6. 6

    Remove optional modules

    Remove any recently added accessory cards or optional paper feeds, then restart the machine to test for hardware conflicts.

  7. 7

    Check network environment

    Ensure network loops or broadcast storms are not flooding the printer interface during startup.

  8. 8

    Inspect power stability

    Confirm that the wall circuit is not overloaded by other heavy appliances sharing the same breaker.

When to contact a professional

If a full power cycle does not clear the SC670 code, call a certified Ricoh technician. Internal controller and engine boards require specialized diagnostic tools and professional replacement. Do not open the machine chassis, avoid high voltage areas, and never touch the internal boards.