93
HP Printer
Severity: ModerateWhat Does This Error Mean?
Error 93 means your HP Color LaserJet detected a failure in its process control system. The process control system manages the transfer of toner from the cartridge to the paper. This error indicates the printer could not successfully complete or verify this process.
Affected Models
- HP Color LaserJet 4600
- HP Color LaserJet 4700
- HP Color LaserJet CP4005
- HP Color LaserJet 5500
- HP Color LaserJet 5550
Common Causes
- The transfer belt or transfer roller has worn out and cannot move toner onto the paper correctly
- A toner cartridge is empty, nearly empty, or not seated properly in its slot
- The printer's internal density sensor is dirty and cannot measure toner coverage accurately
- The image drum unit is at the end of its life and is no longer producing consistent output
- A power fluctuation disrupted the process control during printing
How to Fix It
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Turn off the printer and unplug it for 2 minutes. Plug it back in and power it on to allow a fresh process control check on startup.
A temporary power issue can trigger this error. A clean restart often clears it if the hardware is fine.
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Open the front cover and remove each toner cartridge. Check the toner level indicators. Replace any cartridges that are nearly empty or empty.
Low toner causes the process control system to fail because it cannot maintain consistent transfer density.
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Inspect the transfer belt unit (also called the ITB or image transfer belt). Check for visible damage, toner buildup, or cracks in the belt surface.
HP Color LaserJets have a transfer belt with a recommended page count. If yours has exceeded it, replacement is due.
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Clean the density sensor. It is a small optical sensor inside the printer near the transfer belt. Use a dry, lint-free cotton swab to gently clean the lens.
The density sensor directly feeds data into the process control system. A dirty sensor causes false failures.
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If the error clears but returns regularly, check the page count on your transfer belt kit. Go to the printer's control panel > Information > Print Configuration Page and look for the Transfer Kit page count.
When the transfer kit reaches its rated life, it triggers ongoing process errors including error 93. Replacement restores reliable operation.
When to Call a Professional
If error 93 appears repeatedly after cartridge and transfer belt checks, the process control board or laser scanner may be failing. These components require professional diagnosis and replacement. Contact an HP authorized service center. For printers more than 8 years old, weigh repair costs against a replacement printer.
Frequently Asked Questions
What is the transfer belt on an HP Color LaserJet?
The transfer belt (ITB — Image Transfer Belt) is a continuous loop belt inside your color laser printer. All four toner colors are first printed onto this belt, then transferred together onto the paper in one step. This ensures the colors align perfectly. The belt has a lifespan measured in pages — typically 100,000 to 150,000 pages for most models.
How do I check how many pages my printer has printed?
From the printer's control panel, go to Reports or Information and select Print Configuration Page or Print Supplies Status Page. This printout shows total pages printed and the status of all consumables including the transfer belt. You can also check this information through HP's embedded web server if your printer is on a network.
Where can I buy a replacement transfer belt kit?
HP transfer belt kits are available from HP's official website, authorized HP resellers, and major online retailers like Amazon and Staples. Search for your printer model number plus transfer belt kit to find the correct part. Third-party compatible kits are also available at lower prices — quality varies by brand.