Restore rigid lid positioning and eliminate loose, sagging, or broken scanner covers with this Import ADF Hinges Set for HP LaserJet MFP M136, M137, and M138 series printers. In modern HP multifunction laser architectures, the upper automatic document feeder (ADF) assembly hinges bear continuous mechanical stress every time users lift the scanner lid to place physical documents on the flatbed glass or load multi-page stacks into the top feeder tray.
Mechanical Wear & Structural Failure Modes:
Through daily office use, accidental downward pressure, or forced lid opening:
- Internal Pivot Arm Fatigue: The internal spring-loaded locking teeth or plastic pivot pins inside the hinge housing wear down or snap completely, causing the scanner lid to drop unexpectedly or refuse to stay open.
- Mounting Tab Breakage: Accidental sideways knocks or rough handling can shear off the screw-anchoring flanges that secure the hinges to the printer chassis or scanner lid housing.
- Spring Dislodgement: High tension from repeated opening can pop the internal torsion springs out of alignment, resulting in uneven lid closing gaps.
Key Symptoms Solved:
- Drooping / Falling Scanner Lid: The scanner lid will not stay propped open at an angle, making it difficult to load documents onto the flatbed glass safely.
- Broken Hinge Plastic Shells: Visible cracks or missing plastic pieces around the rear left and right pivot points where the ADF meets the main printer body.
- Skewed ADF Document Scanning: Loose or broken hinges prevent the upper ADF document feeder from pressing evenly against the flatbed glass, causing scanned documents to skew, streak, or jam during multi-page scans.
Manufactured using high-impact engineering polymers reinforced with steel torsion springs, this direct-fit replacement hinge set provides exact OEM alignment and restores factory-grade lid tension.
⚙️ Technical Details
- Specification: Details
- Component Type: ADF (Automatic Document Feeder) Pivot Hinge Assembly (Left & Right Pair)
- Quality Grade: High-Precision Import (Compatible New)
- Condition: New
- Material Construction: High-Impact ABS Structural Plastic with Internal Steel Torsion Springs
- Supported Brand: HP (Hewlett-Packard)
- Supported Printer Models: HP LaserJet MFP Series: M136a, M136nw, M137fnw, M138, M138fnw, M139
- Primary Function: Secures the upper automatic document feeder and scanner lid assembly to the printer chassis while maintaining balanced opening/closing tension
- Common Symptoms Solved: Sagging scanner lid, broken hinge mounting tabs, unexpected lid closure, uneven ADF document scanning pressure
- Package Contents: 1 x Left ADF Hinge and 1 x Right ADF Hinge Set
