To reset the SC code follow these directions:
Resetting Ricoh Savin Lanier Gestetner SC Error Code
Error code 120 is scanner home position sensor problem. If it's a recurring problem, here are some troubleshooting tips:
SOLUTION:
Turn the main switch off and on.
Check the wires between Home Position sensor and the SBU.
Fix scanner board or the SBU .
Check the wires between scanner motor and the scanner I/O board
Fix the scanner motor.
Fix the Home Position sensor.
Fix pulley, timing belt, the scanner wire,
Fix the carriage.
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