Description

🏷️ Product Title

Solenoid (Duplex) for HP LaserJet Pro M403 / 400 Series – Part No. RM1-5421

📝 Short Description

Replacement duplex unit solenoid for HP LaserJet Pro printers.
Controls paper movement during automatic duplex (double-side) printing.
Ideal fix for duplex jams, paper not reversing, or duplex print errors.

📝 Product Description

The Duplex Solenoid (Part No. RM1-5421) is a precision electromechanical component used inside the duplex unit to control paper direction and timing during two-sided printing.

A faulty or sticky duplex solenoid can cause issues such as paper jamming while duplexing, paper not flipping, repeated duplex errors, half-printed pages, or abnormal paper movement. Replacing this solenoid restores smooth duplex operation and reliable double-sided printing.

This part is widely used in professional service centers, enterprise AMC maintenance, and refurbishment operations.

Designed for printers manufactured by HP and compatible Canon models listed below.

⚙️ Compatible Printer Models

🔹 HP LaserJet Pro – Single Function

• M305 (M305 / M305dw)

• M402 (M402n / M402dn / M402dw / M402dne)

• M403 (M403 / M403d / M403dn / M403dw / M403n)

• M404 (M404n / M404dn / M404dw)

• M405 (M405n / M405dn / M405dw)

• M501dn

🔹 HP LaserJet Pro – MFP

• M329 (M329dn / M329dw)

• M426 (M426dw / M426fdn / M426fdw)

• M427 (M427dw / M427fdn / M427fdw)

• M428 Series

• M429 (M429fdw)

🔹 HP New Generation / Managed / Enterprise

• 4004 (4004 / 4004n / 4004dn / 4004dw)

• MFP 4104 (4104 / 4104dw / 4104fdn / 4104fdw)

• M506 (M506n / M506dn / M506x)

• M527 (M527dn / M527f / M527z / M527dnm / M527cm / M527c)

• E52545 (E52545dn / E52545c)

🔹 Canon Compatible Models

• imageCLASS MF424dw / MF426dw / MF543x

• LBP214dw / LBP226dw

• i-SENSYS MF521dw / MF522x / MF525dw

• imageRUNNER 1643i

📌 Grouped Model Reference

HP Series:
305 – 329 – 402 – 403 – 404 – 405 – 426 – 427 – 428 – 429 – 4004 – 4104 – M501 – M506 – M527 – E52545

Canon Series:
214 – 226 – 424 – 426 – 521 – 522 – 525 – 543 – 1643i

🔍 Technical Details

• Product Name: Solenoid (Duplex)

• Part Number: RM1-5421

• Type: Compatible

• Function: Duplex paper direction & timing control

• Condition: New

• Application: Laser printer duplex unit

• Installation: Technician recommended

⭐ Key Features

• ✔ Exact replacement for RM1-5421

• ✔ Restores smooth duplex (double-side) printing

• ✔ Fixes duplex jams & paper reverse issues

• ✔ Durable coil & spring mechanism

• ✔ Perfect compatibility with listed HP & Canon models

⚠️ Important Note

• Please confirm printer model and duplex unit presence before ordering

• Duplex solenoid replacement may require pad cleaning or damping modification

• Installed or used mechanical parts are not returnable

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