HP sprocket 照片上方的白线

@Engla
 
Clean the Sprocket paper path rollers
 
Dirt and debris on the paper path rollers can cause print quality issues. Use the colored Print Quality Card (formerly the Smartsheet) from the same pack of HP ZINK photo paper currently in the Sprocket to clean the paper path rollers.
NOTE: 
To avoid print quality issues, do not use a colored card from a different pack of photo paper.

Remove the Paper Cover, and then remove any photo paper from the input tray.

Roll the paper path rollers back and forth several times.

Check the photo paper and remove any severely bent, wrinkled, or torn photo paper from the stack.

Reload the photo paper with the colored card on the bottom of the stack with the barcode facing down.

Replace the Paper Cover, and then send a print job.

Refer to this document: https://support.hp.com/in-en/product/hp-sprocket-photo-printer/12635221/document/c05660842 for Improving Print Quality.
 
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