Samsung SCX4521FS
- Code: S3-3121
- Display: Scanner Locked.
- Description: CIS unit in the scanner does not move.
- Remedy: 1) Check if the CIS unit moves when turning the machine off then on. 2) Check if the CIS cable is connected correctly. Reconnect it. 3) If the CIS unit is defective, replace it. 4) Check if there is any defective part in the scanner. Find and replace it. 5) If the problem persists, replace the main board.
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