Sensor / Flag Assembly — This sensor or flag tells the controller where the paper is. Intermittent jams with no visible obstruction usually mean the flag, not the board.
This rear cover exit sensor detects paper exit at the fuser rear cover of compatible Lenovo M7605d, M7615dna, M3410, M7605z and M3420 printers. It fixes false jam and paper exit error messages.
For Lenovo M7605d Rear Cover Exit Sensor fits Lenovo M7605d, M7615dna, M3410, M7605z and 1 more listed below. Not suitable for: Faults caused by a damaged main board — test the sensor before ordering. Match the part number to your machine before ordering.
Updated: 2026-09-26 · Technical review for sensor / flag assemblys
| Parameter | Value | Condition / method |
|---|---|---|
| Flag material | POM or ABS, OE-matched profile | Fitment check |
| Sensor type | Optical or mechanical to match OE | Recognised by host controller |
| Response | Triggers within the host timing window | Bench test on host machine |
| Mounting | OE-matched bracket and connector | Fitment check |
| Compliance | RoHS / REACH | Supplier declaration per batch |
| Printer model | Status |
|---|---|
| Lenovo M7605d | Verified fitment |
| M7615dna | Verified fitment |
| M3410 | Verified fitment |
| M7605z | Verified fitment |
| M3420 | Verified fitment |
If your machine is not listed, send us the model and a photo of the original part — parts that look alike within the same family are frequently not interchangeable.
| Symptom | Mechanism |
|---|---|
| Intermittent jam with no paper stuck | Flag is sticking or not returning |
| Printer reports paper present with an empty tray | Flag is broken or out of position |
| Jam error immediately after start-up | Sensor not seated or connector is loose |
| Visible crack on the flag arm | Fatigue failure |
Check the connector before replacing the part — a reseat fixes a large share of sensor faults. Make sure the flag moves freely through its full travel before closing the machine.
Q: Board or just the flag?
A: Most failures are the flag or the flag shaft. Order the sensor body only when you have confirmed the flag and connector are good.
Q: What is the MOQ?
A: 100 pcs per part number.
Send your enquiry — quote within 12 hours
Start with the flag. Move it by hand — if it binds or fails to spring back, that is the fault. If it moves freely and the error persists, test the connector next, and only then suspect the board.
Usually because the original cause was a stiff shaft or a worn bush rather than the flag itself. Inspect the pivot and the spring before fitting the next part.
Yes. We ship by sea, air and express to North America, Europe, South America, the Middle East and South-East Asia, and we handle export documentation. Send the destination port or airport and the quantity, and we will quote FOB, CIF or DDP as you prefer.
Parts are warranted against manufacturing defects and are bench-tested on the host machine type before packing. Fitment-related claims need the part reported before installation. Send us the part number and quantity and we will state the exact term for that item in writing.
Stock items ship in 15–30 days; new tooling takes 30–45 days. We ship by sea, air and express under FOB, CIF or DDP Incoterms, and payment is T/T or L/C at sight. Give us the destination port and quantity for a firm schedule.
Yes. Custom logo, printed polybag, blister or retail box are all available, and we can tool new compounds or geometries from a drawing or sample. Minimum quantities for custom work are higher than for stock parts — send the specification and we will quote both.
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