69
HP Printer
Severity:What Does This Error Mean?
Error 69 is a duplex unit error on HP LaserJet printers. The duplex unit is the add-on accessory that allows the printer to print on both sides of a page. This error means the duplex unit is not communicating properly with the printer.
Affected Models
- HP LaserJet 4000 Series
- HP LaserJet 4050 Series
- HP LaserJet 4100 Series
- HP LaserJet 5si Series
- HP LaserJet 8000 Series
Common Causes
- The duplex unit is not fully seated or has come loose from the printer's connection port
- The electrical connector between the duplex unit and printer is dirty or corroded
- The duplex unit's internal motor or sensor has failed
- The printer firmware does not recognize or is incompatible with the attached duplex unit
- The duplex unit is the wrong model and is not compatible with the printer
How to Fix It
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Power off the printer completely. Remove the duplex unit by pressing the release tabs and pulling it straight out.
The duplex unit typically attaches to the rear of the printer. Consult your printer's manual for the exact release mechanism.
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Inspect the electrical connector on the back of the duplex unit. Clean any dust or debris with a dry, lint-free cloth.
Use a cotton swab lightly dampened with isopropyl alcohol to clean any corrosion from the gold contacts.
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Reattach the duplex unit firmly until you hear or feel it click securely into place. Power the printer back on.
A connection that seems attached but is not fully clicked in is a very common cause of error 69.
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Check that the duplex unit model number matches what is listed as compatible in your printer's documentation.
HP makes many duplex units and not all are cross-compatible. The model number is printed on a label on the unit itself.
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Update the printer firmware from HP's support website. Then print a configuration page to confirm the duplex unit is now detected.
Older firmware sometimes fails to recognize newer duplex unit revisions. A firmware update often resolves compatibility issues.
When to Call a Professional
If reseating and cleaning the duplex unit does not fix the error, the unit itself may need to be replaced. Duplex units are often available as refurbished parts for $30 to $100 depending on the printer model. A technician can verify compatibility before purchasing a replacement.
Frequently Asked Questions
What is a duplex unit?
A duplex unit is an accessory that attaches to a printer and allows it to automatically flip the paper over and print on both sides. Without it, you would have to manually flip and re-feed each page to print double-sided. Many HP LaserJet printers support duplex units as optional add-ons.
Can I still print normally if I get error 69?
Often yes — if you are only trying to print single-sided pages, the duplex unit error may not block all printing. However, some printer models will refuse to print at all when they detect a communication error with an attached accessory. Try sending a standard single-sided print job to test.
Can I just remove the duplex unit to get rid of the error?
Yes, in most cases. If you remove the duplex unit completely and the printer no longer detects it, the error should clear. You will lose the ability to print double-sided automatically, but single-sided printing will work normally. This is a good temporary fix while you source a replacement unit.