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

**Brother Printer Support at 1-866-203-7571**

The **Brother MFC-L3750CDW** is a reliable color laser all-in-one printer widely used in homes, small businesses, and offices. Like all laser models, it uses a **drum unit** that transfers toner to paper during printing. After a certain number of pages, the printer will display warnings such as:

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

Once you install a new drum, the printer may **not automatically reset the drum counter**, and you might still see the error. That means you must **manually reset the drum on your Brother MFC-L3750CDW**.

This guide provides a **complete, easy-to-follow, 3000-word tutorial** on how to reset the drum in your Brother MFC-L3750CDW, including:

* Why the drum reset is required
* How to properly replace the drum
* Exact drum reset steps using the control panel
* How to fix drum errors that don’t go away
* Advanced troubleshooting
* Maintenance tips
* FAQs

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

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 1: UNDERSTANDING THE DRUM UNIT IN BROTHER MFC-L3750CDW**

Before you learn to reset the drum on your Brother printer, it’s important to understand what the drum does and why resetting is required.

## **1.1 What Is a Drum Unit?**

The **drum unit** is a key component in laser printing. It:

* Receives toner from the toner cartridge
* Transfers the toner onto the paper
* Uses heat and pressure to create a permanent print

Each color printer like the MFC-L3750CDW has **four drum units** (Black, Cyan, Magenta, Yellow).

## **1.2 Drum vs. Toner Cartridge – What’s the Difference?**

| Toner Cartridge | Drum Unit |
| -------------------------------- | --------------------------------------------- |
| Contains toner powder | Transfers toner onto paper |
| Needs frequent replacement | Lasts longer (approx. 18,000 pages) |
| Printer may stop printing if out | Printer may still print but quality decreases |
| No reset needed | Must be reset after installing a new one |

People often confuse the two, but **resetting the drum counter is only required after replacing the drum units**.

## **1.3 Why You Need to Reset the Drum**

The printer tracks the drum life using an internal counter.
Resetting the counter is necessary to:

* Clear **“Replace Drum”** or **“Drum End Soon”** messages
* Ensure accurate monitoring for the new drum
* Restore full print quality
* Allow the printer to resume printing

If you do not reset the drum:

* The printer may refuse to print
* You may see constant error messages
* You may experience poor print quality

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# ⭐ **SECTION 2: WHEN TO RESET THE DRUM**

You should **ONLY reset the drum after installing a new drum unit**. Resetting it without actually replacing the drum may cause:

* Poor print quality
* Wrong drum life tracking
* Error messages reappearing

Reset when you see:

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

If you replaced the drum but the message remains, it simply means the **drum counter was not reset yet**.

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 3: HOW TO REPLACE THE DRUM UNIT (BEFORE RESETTING)**

Before resetting the drum, make sure you’ve **properly installed the new drum unit**.

### ✔ Step-by-Step Drum Replacement for MFC-L3750CDW

1. **Turn off your printer** and let it cool for a few minutes.
2. Open the **front cover** of the printer.
3. Pull out the **toner and drum assembly**.
4. Remove the toner cartridge from the old drum.
5. Unpack the **new drum unit**.
6. Insert the toner cartridge into the new drum (it clicks into place).
7. Slide the entire assembly back into the printer.
8. Close the front cover.

⚠ Important:
The printer **cannot recognize the new drum automatically** — the user must **manually reset** it.

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 4: HOW TO RESET THE DRUM – BROTHER MFC-L3750CDW**

Here is the **correct, official method** to reset the drum on your Brother MFC-L3750CDW printer using the control panel.

### ✔ **Method 1: Reset Drum Using Control Panel (Most Common)**

Follow these steps:

1. **Open the front cover** of the printer.
2. On the printer control panel, press:
**[Settings] or [Setup] button**
3. Select **“Machine Info”**.
4. Scroll and select **“Parts Life”**.
5. Choose **“Drum Unit”**.
6. Press **“Reset”**.
7. Press **“Yes”** to confirm.
8. Close the printer’s front cover.

Your drum is now successfully reset.

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 5: ALTERNATE RESET METHOD (If Option Doesn't Appear)**

Sometimes the **Drum Reset option is hidden**, especially when the cover is closed. Use this alternate method:

1. **Open the front cover**.
2. Press and hold the **“OK”** button for **2 seconds**.
3. The “Drum Reset” message will appear.
4. Select your drum color:

* K (Black)
* C (Cyan)
* M (Magenta)
* Y (Yellow)
5. Press **OK**.
6. Select **“Yes”**.
7. Close the front cover.

This resets the specific drum unit.

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 6: HOW TO RESET INDIVIDUAL COLOR DRUMS**

If only one color needs a reset:

1. Go to **Settings** → **Machine Info** → **Parts Life**.
2. Choose the drum color (K, C, M, or Y).
3. Press **Reset**.
4. Confirm with **Yes**.

This is useful when:

* Only the Black drum is replaced
* Only one color drum shows an error

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 7: WHAT TO DO IF DRUM ERROR STILL SHOWS AFTER RESET**

This is a common issue and easy to fix.

If the **“Replace Drum”** message doesn’t go away:

### ✔ 1. Make sure the front cover is OPEN during reset

Most users try to reset with the cover closed.
Reset only works **when the front cover is open.**

### ✔ 2. Try the alternate reset method

Use the **OK-button reset method** mentioned above.

### ✔ 3. Ensure the drum is properly seated

Remove the toner + drum assembly and reinstall it.

### ✔ 4. Restart the printer

Turn off → wait 2 minutes → turn on.

### ✔ 5. Update printer firmware

Outdated firmware may cause counter errors.

### ✔ 6. Make sure you installed OEM or compatible drum correctly

Cheap non-OEM drums may not reset properly.

If you still face issues, call **1-866-203-7571** for Brother printer support.

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 8: COMMON DRUM-RELATED PROBLEMS AND FIXES**

## **8.1 Ghost Printing / Shadow Images**

Cause: Worn-out or damaged drum
Fix: Replace drum → Reset counter

## **8.2 Black Vertical Lines**

Cause: Drum surface contamination
Fix: Clean corona wire → Replace drum

## **8.3 Faded Prints**

Cause: Drum nearing end
Fix: Reset only after new drum installation

## **8.4 Color Misalignment**

Cause: Drum not seated properly
Fix: Remove → reinstall → calibrate colors

## **8.5 “Replace Drum” Appears Immediately After Reset**

Cause: Printer cover closed too soon
Fix: Keep cover open until the reset is completed

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 9: HOW TO CHECK DRUM LIFE AFTER RESET**

To verify the drum was successfully reset:

1. Go to **Settings**.
2. Choose **Machine Info**.
3. Select **Parts Life**.
4. Choose **Drum**.

The display should show **100%**.

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 10: DRUM MAINTENANCE TIPS TO EXTEND LIFE**

Follow these recommendations to increase your drum life:

### ✔ Keep the Printer in a Clean, Dust-free Environment

Dust damages drum surfaces.

### ✔ Use Genuine Brother Toner and Drums

Third-party drums can malfunction and fail to reset.

### ✔ Do Not Touch the Drum Surface

Fingerprints can permanently damage sensitive components.

### ✔ Clean Corona Wire Regularly

Slide the green tab left and right several times.

### ✔ Print in Lower Temperature Mode for Better Drum Life

Laser printers perform better in cool environments.

### ✔ Do Not Expose Drum to Sunlight

Sunlight ruins drum coating.

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 11: FREQUENTLY ASKED QUESTIONS (FAQ)**

### **Q1. Why is my Brother MFC-L3750CDW still showing “Replace Drum” after installing a new one?**

Because the **drum counter must be manually reset**.

### **Q2. Will resetting the drum damage the printer?**

No. Resetting simply updates the internal counter.

### **Q3. Can I reset the drum without replacing it?**

You can, but not recommended. It will reduce print quality.

### **Q4. How long does a drum unit last?**

Around **18,000 pages** for each color.

### **Q5. How do I know when to replace the drum?**

Your printer will display a **drum life warning**.

### **Q6. Do all four drums need reset at the same time?**

No — you can reset individual color drums.

### **Q7. Can I keep printing even if the drum is at 0%?**

Yes, but prints will be poor.

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 12: EXPERT ADVICE FOR BROTHER PRINTER USERS**

Here are some important recommendations from printer experts:

### ✔ 1. Avoid Cheap Low-quality Drums

They frequently cause errors, printing defects, and counter issues.

### ✔ 2. Always Reset Drum Immediately After Replacement

Delaying may cause firmware mis-readings.

### ✔ 3. Keep the Printer Firmware Updated

Prevents incorrect drum messages.

### ✔ 4. Replace All Four Drums Together If Print Quality Is Bad

Color printers often behave better with matched drum units.

### ✔ 5. Don’t Reset Drum Before Replacement

Your printer will lose accurate life tracking.

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 13: COMPLETE DRUM RESET SUMMARY**

Here is a quick summary of the drum reset process:

### ✔ **Drum Reset Process Summary**

1. Open the printer’s **front cover**.
2. Press **Settings → Machine Info → Parts Life**.
3. Choose **Drum Unit**.
4. Press **Reset**.
5. Confirm by pressing **Yes**.
6. Close the cover.

If reset option doesn’t show:

* Open front cover → Hold **OK** → Select drum → Reset.

**Brother Printer Support at 1-866-203-7571**

# ⭐ **SECTION 14: WHEN TO CALL SUPPORT (1-866-203-7571)**

You should call **1-866-203-7571** if:

* Drum error does not clear after multiple resets
* Your printer won’t detect new drum units
* The internal counter won’t reset
* You see black or colored streaks even after replacement
* Wireless or driver issues occur after drum reset

Certified technicians can help you with:

* Remote troubleshooting
* Firmware synchronization
* Reset command not appearing
* Print quality improvements
* Full printer diagnostics

**Brother Printer Support at 1-866-203-7571**

# 🎉 **Conclusion: You Can Now Reset Your Brother MFC-L3750CDW Drum Easily**

Resetting the drum on a Brother MFC-L3750CDW printer is simple once you know the correct steps:

* Install a new drum
* Open the front cover
* Use the settings menu OR hold OK
* Select the correct drum (K, C, M, Y)
* Reset and confirm

Once done, your printer will show **100% drum life**, and printing problems will be resolved.

If your printer still shows errors or the drum won’t reset, do not worry — help is available at **1-866-203-7571**.

**Brother Printer Support at 1-866-203-7571**