To protect the scanner carriage, the carriage must be locked to the scanner frame before shipping. The scanner can be moved to the shipping lock position with SP4-806-001 (Scanner carriage storage operation).
If a pre-shipping check is required, make sure to move the scanner carriage to the right position with SP4-806-001 and mount the locking parts.
SC121-00 will occur when the power is turned on or scanning takes place while the carriage is locked.