# 1-866-203-7571 How to Reset Drum Brother MFC-L3750CDW?

**📞 Brother Printer Support: 1-866-203-7571**

The **Brother MFC-L3750CDW** is a widely used digital color all-in-one printer known for its reliability, clarity, and efficient printing performance. However, like all laser printers, it uses a **drum unit** that eventually reaches its estimated life cycle. When the printer detects that the drum count has reached its limit, you may see messages such as:

* **“Replace Drum”**
* **“Drum End Soon”**
* **“Drum Near End”**
* **“Drum End”**

In some cases, after you install a new drum unit, the printer may still show a drum-related warning. That’s when you must perform a **manual drum reset**.

This tutorial will teach you **exactly how to reset the drum on your Brother MFC-L3750CDW**, why the issue happens, mistakes to avoid, how to maintain the drum properly, and additional troubleshooting solutions.

If you ever need expert help, you can call **Brother Printer Support at 1-866-203-7571**.

**📞 Brother Printer Support: 1-866-203-7571**

# **1. Understanding the Drum Unit in Brother MFC-L3750CDW**

The **drum unit** is an essential component that transfers toner to paper during printing. Your model uses the **Brother DR-223CL drum unit**, which has separate color drums for **black, cyan, magenta, and yellow**.

Each drum typically has a life cycle of **18,000 to 20,000 pages**, depending on usage patterns.

### **1.1 Why the Drum Needs Resetting**

Even when you install a *new* drum, the printer may not automatically detect it. This can happen due to:

* Incorrect installation
* Residual memory inside the printer
* Firmware glitches
* Static charge on contacts
* A reset was not performed automatically

In those cases, a **manual drum reset** becomes necessary.

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# **2. Signs Your Brother MFC-L3750CDW Drum Needs a Reset**

A drum reset is required when:

### ✔ **You installed a new drum, but printer still shows:**

* Replace Drum
* Drum End Soon
* Drum Near End
* Drum End

### ✔ **Print quality issues remain even with a new drum:**

* Gray background
* Streaks or lines
* Dark spots
* Repeating marks at intervals

### ✔ **Your printer refuses to print unless drum is reset.**

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# **3. Important Warnings Before Resetting the Drum**

Before performing a drum reset, understand this:

> **Resetting the drum without replacing it does NOT extend its actual life.**
> It only resets the page counter in the software.

### ⚠ Key warnings:

* Resetting a worn-out drum can lead to severe print defects.
* Resetting the drum repeatedly may damage the printer.
* Only reset the drum *after installing a new one*.

If uncertain, call **1-866-203-7571** for help.

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# **4. Step-by-Step: How to Reset Drum Brother MFC-L3750CDW**

Here is the **exact procedure** to reset the drum on the MFC-L3750CDW.

### ✔ **Step 1: Open the Front Cover**

* Power the printer ON.
* Gently pull the **front access cover** down.

### ✔ **Step 2: Press the “Clear” Button on the Touchscreen**

* On the screen, locate and press the **Clear (X)** button.

### ✔ **Step 3: Drum Reset Menu Appears**

You will see a list of drum colors:

* Drum Black
* Drum Cyan
* Drum Magenta
* Drum Yellow
* Drum All
Choose the correct one depending on which drum you replaced.

### ✔ **Step 4: Select the Drum to Reset**

If you replaced all drums, choose **Drum All**.

If you replaced only one, choose:

* **K** for Black
* **C** for Cyan
* **M** for Magenta
* **Y** for Yellow

### ✔ **Step 5: Confirm the Reset**

* Press **Yes** to start the reset.
* The printer resets the selected drum(s).

### ✔ **Step 6: Close the Front Cover**

* The printer will now update the drum life.

You should no longer see the Replace Drum message.

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# **5. Alternative Drum Reset Method (If Screen Is Not Responding)**

If the touchscreen does not respond or the Clear button does not appear, try this method:

### ✔ Step 1: Open front cover

### ✔ Step 2: Press and hold **OK** for 2 seconds

### ✔ Step 3: Press **Up Arrow** to access the reset menu

### ✔ Step 4: Choose the drum color

### ✔ Step 5: Press **OK** to confirm

This alternative method works especially when:

* Firmware is outdated
* Touchscreen buttons malfunction
* Printer is in maintenance mode

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# **6. How to Install the Drum Properly Before Resetting**

Improper drum installation may cause the printer to reject the reset.

### ✔ Step-by-step Drum Installation:

1. Turn the printer OFF.
2. Open the front cover.
3. Pull out the toner+drum assembly.
4. Separate toner from drum.
5. Insert toner into the NEW drum until it clicks.
6. Slide the assembly back into the printer.
7. Close the cover.

Now perform the drum reset.

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# **7. What If the Brother MFC-L3750CDW Drum Does Not Reset?**

Sometimes even after performing the correct reset steps, the drum may not reset.

### Here’s what to check:

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## **7.1 Issue: Wrong Drum Selected in Reset Menu**

If you replaced:

* Black drum → Reset **K**
* Yellow drum → Reset **Y**
* Cyan drum → Reset **C**
* Magenta drum → Reset **M**

Selecting the wrong one may lead to:

* Reset failure
* Incorrect drum life reading

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## **7.2 Issue: Firmware Outdated**

Updating firmware can fix reset bugs.

From touchscreen:

**Settings → Machine Info → Firmware Update → Update**

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## **7.3 Issue: Drum Not Fully Installed**

A partially seated drum will cause detection errors.

Remove and reinstall the drum assembly firmly.

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## **7.4 Issue: Drum Sensor Dirty**

Dust on the sensor can prevent detection.

To fix:

* Open printer
* Blow compressed air
* Wipe sensor carefully

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## **7.5 Issue: Using Non-Genuine Drum**

Third-party drums often fail to auto-reset.

If your printer refuses to accept the drum:

Call **1-866-203-7571** for support.

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# **8. When Should You NOT Reset the Drum?**

Resetting should be avoided when:

* The drum is near end but not replaced
* Print quality is already deteriorating
* Toner is leaking
* Drum surface is scratched
* You see repeated marks every 3–4 inches

In these cases, resetting may worsen the printer’s condition.

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# **9. How to Check Drum Life After Reset**

To confirm the reset:

1. Go to **Settings**
2. Select **Machine Information**
3. Choose **Parts Life**
4. Tap **Drum**
5. It should show **100%**

If not, repeat the reset.

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# **10. Expert Tips to Extend Drum Life**

Here are ways to maximize drum performance:

### ✔ Use high-quality Brother toners

Cheap toner produces excess particles that damage the drum.

### ✔ Keep the printer in a cool, dust-free place

Heat affects drum sensitivity.

### ✔ Print in toner-save mode when possible

Longer drum life.

### ✔ Avoid touching the green drum surface

Fingerprints reduce print quality.

### ✔ Clean corona wire regularly

Slide the blue tab left and right several times.

### ✔ Let the printer rest between large print jobs

Prevents excessive drum heat.

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# **11. How to Clean Brother MFC-L3750CDW Drum Unit**

If prints show streaks or lines, the drum may be dirty.

### Steps:

1. Open the printer front cover
2. Remove drum+toner
3. Detach toner
4. Clean the drum surface with a soft lint-free cloth
5. Avoid exposing drum to bright light
6. Reinstall everything

Cleaning often eliminates:

* Vertical streaks
* Gray background
* Speckled printing

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# **12. How Long Does the Drum Last After Reset?**

A new genuine drum usually lasts:

* **18,000–20,000 pages (black)**
* **15,000–18,000 pages (color)**

After reset, the internal counter starts from 0% again.

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# **13. Troubleshooting Print Quality After Drum Reset**

If print issues continue even after installing and resetting a new drum:

### ✔ Clean the laser window

### ✔ Clean corona wire

### ✔ Check toner levels

### ✔ Update firmware

### ✔ Print a test page

### ✔ Change paper type settings

### ✔ Replace toner cartridges if low

If still unresolved, dial **1-866-203-7571** for help.

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# **14. Drum Reset vs Toner Reset – What’s the Difference?**

Many users confuse drum and toner resets.

### ✔ **Toner reset** fixes:

* “Toner Low”
* “Replace Toner”

### ✔ **Drum reset** fixes:

* “Replace Drum”
* “Drum End Soon”

**Toner is the powder. Drum is the printing mechanism.**
Each requires separate resetting steps.

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# **15. Common Myths About Drum Resetting**

### ❌ *Myth 1: Resetting the drum makes it new again.*

Reset only resets the count; it does not restore drum quality.

### ❌ *Myth 2: You can keep resetting the same drum forever.*

This reduces print quality and may harm the printer.

### ❌ *Myth 3: All drums reset automatically.*

Only genuine drums reset reliably.

### ❌ *Myth 4: Drum and toner are the same thing.*

They are completely different components.

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# **16. When You Need Professional Support**

Call **Brother Printer Support: 1-866-203-7571** if:

* Drum won’t reset
* Printer keeps showing error messages
* You have poor print quality after reset
* You replaced both toner and drum but still get warnings
* Screen is frozen or buttons don’t work
* Printer won't print after reset

A technician can walk you through advanced steps including:

* Maintenance mode reset
* Sensor testing
* Drum contact cleaning
* Firmware repair
* Faulty component diagnostics

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# **Conclusion**

Resetting the drum on a **Brother MFC-L3750CDW** is simple if you follow the correct steps:

### **Quick Summary:**

1. Open front cover
2. Press **Clear (X)**
3. Select drum color or **Drum All**
4. Confirm reset
5. Close the cover

A proper reset ensures your printer recognizes the new drum and functions normally.
If the drum reset doesn’t work or your printer shows errors even after installation, it may indicate deeper issues such as:

* Sensor malfunction
* Firmware bugs
* Drum installation errors
* Faulty replacement part

For immediate expert help, you can call:

# **📞 Brother Printer Support: 1-866-203-7571**