Samsung ML-451 Series Service Manual page 195

► Error Code
H2-4A20
► Error message
Mailbox door Open / Mail door is open. Close it
► Symptom
Rear Door is opened, Micro Switch is not assembled properly or damaged, Harness is damaged. Main Board is
damaged, door flag is damaged.
► Troubleshooting method
1) Check the Rear Door Closed firmly.
2) Check Mailbox Main Board Harness connection.
3) Check the Rear Door Switch Harness connection.
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4. Alignment and Troubleshooting
4-94