66
HP Printer
Severity:What Does This Error Mean?
Error 66 means the printer detected a problem with an external device connected to it. This includes external paper trays, finishers, or other accessories. Disconnecting the external accessory is the first step.
Affected Models
- HP LaserJet 8000 Series
- HP LaserJet 8100 Series
- HP LaserJet 8150 Series
- HP LaserJet 9000 Series
- HP LaserJet 9050 Series
Common Causes
- An external output tray or finisher is not properly connected
- An optional paper tray accessory is malfunctioning
- The cable or connector between the printer and the accessory is damaged
- The external accessory firmware is outdated and incompatible
- The accessory itself has an internal hardware fault
How to Fix It
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Power off the printer completely. Do not just put it to sleep.
The printer and all accessories must be fully powered off before disconnecting anything.
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Disconnect all external accessories from the printer. This includes extra paper trays, finishers, and stackers.
Check both the physical connection points and any attached data cables.
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Power the printer back on without any accessories connected. Check if error 66 is gone.
If the printer starts normally, the accessory is the cause of the problem.
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Reconnect one accessory at a time. Power on after each connection to identify which one is faulty.
This process of elimination will tell you exactly which accessory is causing the error.
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For the faulty accessory, check for firmware updates on HP's support site. Update if one is available.
Outdated accessory firmware is a common cause of compatibility errors.
When to Call a Professional
If disconnecting and reconnecting the accessory does not fix the error, the accessory itself may be faulty. Accessory repairs depend on the type of device. Contact HP support for pricing on the specific accessory attached to your printer.
Frequently Asked Questions
Can error 66 appear if I have no accessories connected?
It is rare, but if the printer was previously configured with an accessory, ghost connection data may cause the error. A full power cycle and a factory reset can sometimes clear this. Check your printer's settings menu for any accessory configuration options.
Does error 66 affect all printers or just enterprise models?
Error 66 primarily affects larger HP LaserJet workgroup and enterprise printers. These are the models that support external finishers and stacking accessories. Small home printers rarely show error 66.
My external tray was working fine yesterday. Why the sudden error?
Accessories can develop loose connections over time from vibration or movement. Also, firmware updates to the printer can sometimes cause compatibility issues with accessories. Check for firmware updates for both the printer and the accessory.