Samsung ML-451 Series Service Manual page 154

4. Alignment and Troubleshooting
► Error Code
H1–1253
H1–1353
H1–1453
H1–1553
► Error message
Input System Failure #H1-1253 : Pull Tray 2 out and insert it.
Input System Failure #H1-1353 : Pull Tray 3 out and insert it.
Input System Failure #H1-1453 : Pull Tray 4 out and insert it.
Input System Failure #H1-1553 : Pull Tray 5 out and insert it.
► Symptom
The paper in the optional cassette is not picked up.
► Troubleshooting method
1) Check if the Gear-Idle Lift is broken.
2) Check if the Signal-Switch is operated properly. If it is defective, replace it.
3) Check if the Lift-Motor connector is connected properly.
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