# 1-866-203-7571 How to fix HP LaserJet error 79 Service Error?
HP LaserJet printers are reliable and widely used in offices and homes. However, like any complex device, they can encounter errors. One of the most common and frustrating errors is **Error 79**, also known as **“Service Error 79”**. This error usually occurs due to firmware problems, communication issues, or internal printer malfunctions. It often stops printing and requires immediate attention.
Understanding and fixing this error can save you time, money, and frustration.
## Table of Contents
1. What is HP LaserJet Error 79?
2. Common Causes of Error 79
3. Preliminary Checks Before Fixing Error 79
4. Step-by-Step Guide to Fix Error 79
* Reset the Printer
* Check and Update Firmware
* Remove and Reinstall Print Jobs
* Check Printer Drivers and Software
* Inspect Network Connections
* Clear Print Queues
5. Advanced Troubleshooting
* Internal Printer Board Issues
* Memory Problems
* Hardware Component Failures
6. Preventing Future Occurrences of Error 79
7. Contacting HP Support
8. Conclusion
## 1. What is HP LaserJet Error 79?
**Error 79** is a service error that occurs on HP LaserJet printers when the device detects a critical issue that prevents normal printing operations. This error can manifest as:
* **Error message on the printer display:** “79 Service Error” or “79.xx Service Error.”
* **Intermittent print failures:** The printer stops printing randomly.
* **Print job failures:** Documents may fail to print or get stuck in the queue.
The “79” code is often associated with **firmware errors**, **job spooling issues**, or **hardware malfunctions**.
## 2. Common Causes of HP LaserJet Error 79
Understanding why Error 79 occurs helps in resolving it efficiently. The main causes include:
1. **Firmware Issues**
* Outdated or corrupted printer firmware can trigger error 79.
* Incompatible firmware versions with the operating system may cause conflicts.
2. **Memory and Job Spooling Problems**
* Large or complex print jobs can overwhelm the printer’s memory.
* Print jobs with corrupted data can create a service error.
3. **Driver Conflicts**
* Incorrect or outdated printer drivers on your computer may cause error 79.
* Multiple printers on the network can lead to driver communication issues.
4. **Network or Connection Issues**
* Loose or damaged cables.
* Problems with network communication on printers connected via Ethernet or Wi-Fi.
5. **Internal Hardware Malfunctions**
* Faulty formatter board or memory modules.
* Printer components overheating or failing.
6. **Corrupted Print Jobs**
* Documents with large graphics or complex formatting can trigger memory overflow.
## 3. Preliminary Checks Before Fixing Error 79
Before performing advanced troubleshooting, it’s essential to perform some preliminary checks:
1. **Turn Off the Printer and Disconnect Cables**
* Switch off the printer.
* Unplug the power cord and all connected cables (USB, Ethernet, or parallel).
* Wait for **60 seconds** to allow residual energy to dissipate.
2. **Check for Overheating**
* Ensure the printer is placed in a well-ventilated area.
* Avoid placing it near radiators or direct sunlight.
3. **Inspect Print Jobs**
* Large print jobs can cause memory overflow.
* Remove any pending jobs from the computer’s print queue.
4. **Restart Computer and Printer**
* Sometimes, simply restarting both devices can resolve temporary communication issues.
## 4. Step-by-Step Guide to Fix Error 79
### Step 1: Reset the Printer
A reset often clears temporary firmware glitches.
1. Turn off the printer.
2. Disconnect the power cord from the wall outlet.
3. Wait for **30–60 seconds**.
4. Reconnect the power cord and turn on the printer.
5. Attempt to print a simple test page.
> **Tip:** Avoid printing complex graphics during the first test after reset.
### Step 2: Update Printer Firmware
Firmware updates resolve many Error 79 issues caused by software bugs.
1. Visit the [HP Support Website](https://support.hp.com).
2. Locate your printer model.
3. Download the latest firmware for your printer.
4. Connect your printer via USB or network cable.
5. Follow HP’s instructions to update the firmware.
> **Important:** Do not turn off the printer during firmware updates. Doing so can permanently damage your printer.
### Step 3: Remove and Reinstall Print Jobs
Corrupted print jobs can trigger Error 79.
1. Open the print queue on your computer:
* Windows: Control Panel → Devices and Printers → Printer → See what’s printing.
* Mac: System Preferences → Printers & Scanners → Open Print Queue.
2. Cancel all pending print jobs.
3. Try printing a small, simple document first.
> **Tip:** Avoid sending large PDFs or high-resolution images until the printer is stable.
### Step 4: Check Printer Drivers and Software
Driver issues are a common cause of error 79.
1. Remove existing printer drivers:
* Windows: Control Panel → Devices and Printers → Remove Device.
* Mac: System Preferences → Printers & Scanners → Remove Printer.
2. Download the latest drivers from HP’s official website.
3. Reinstall the printer using the latest driver.
### Step 5: Inspect Network Connections
For network-connected printers:
1. Check Ethernet cables for damage.
2. Ensure the printer is connected to the correct network.
3. Restart the network router if necessary.
4. Assign a static IP address to prevent intermittent connection issues.
### Step 6: Clear Print Queues on the Printer and Computer
Sometimes, jobs stuck in the printer memory cause service errors.
1. Access the printer control panel → Menu → Printer Maintenance → Clear Memory.
2. On your computer, clear any pending print jobs.
3. Restart the printer and computer.
## 5. Advanced Troubleshooting
If basic steps don’t work, the error may be due to hardware or internal memory issues.
### Internal Printer Board Issues
* The **formatter board** or main logic board may be faulty.
* Inspect for visible damage or burn marks.
* Replacing the board may require professional help.
### Memory Problems
* Printer memory modules can fail, causing error 79.
* Remove and reseat memory modules (if removable).
* For permanent memory errors, replace with compatible memory.
### Hardware Component Failures
* Fuser assembly, controllers, or other components may trigger error 79.
* Overheating can cause temporary errors; let the printer cool before retrying.
* Persistent hardware issues require HP service technician intervention.
## 6. Preventing Future Occurrences of Error 79
1. **Regular Firmware Updates**
* Check HP website monthly for firmware updates.
2. **Avoid Overloading the Printer**
* Don’t send too many complex print jobs at once.
* Print large files in smaller batches.
3. **Use Genuine HP Supplies**
* Non-HP toner or cartridges may cause communication errors.
4. **Proper Printer Placement**
* Avoid extreme temperatures and dusty areas.
5. **Regular Maintenance**
* Clean printer rollers and internal components regularly.
## 7. Contacting HP Support
If the error persists after all troubleshooting steps, contact HP Support or a certified technician.
* **Toll-Free Number (USA):** 1-866-203-7571
* **Website:** [https://support.hp.com](https://support.hp.com)
* Provide your **printer model, firmware version, and error details**.
* HP can guide you through advanced troubleshooting or repair options.
> **Tip:** Keep your printer warranty and service information handy to expedite support.
## 8. Conclusion
HP LaserJet Error 79 (Service Error) is often caused by firmware issues, corrupted print jobs, driver conflicts, or internal hardware problems. Following the steps outlined above—from basic resets to firmware updates and advanced troubleshooting—can help resolve this issue. Regular maintenance, firmware updates, and careful handling of print jobs can prevent future occurrences.
If the problem persists, professional support via HP or a certified technician may be required. Using the official HP support number **1-866-203-7571** ensures you receive accurate guidance and service.
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