Door Open Sensor Deskjet 3752

[northnob]

I have an old 3752 printer that constantly is thinking the door is open in the printer status. I was wondering what sensing mechanisms the printer is using to detect if the door is open or not and if there is anyway to manually over ride them (i.e. forcing a switch open). It's an old printer and can't be repaired, but I love to save it from going to a landfill for as long as I can.

[Raj_05]

Hi @northnob,

Welcome to HP Support Community.

Thank you for posting your query, I will be glad to help you.

The HP DeskJet 3752 uses mechanical sensors to detect whether the printer door is open or closed. These sensors are typically simple switches that are activated when the door is closed. Here are some key points regarding the sensing mechanisms and potential workarounds.

Sensing Mechanisms

Mechanical Switch: The printer likely has a physical switch located near the door or cover that gets pressed when the door is closed. If the door is open, this switch is released, triggering the printer to report that the door is open.

Optical Sensor: In some printers, an optical sensor may be used to detect whether the cover is closed by shining light across a gap. If the light is interrupted (i.e., the door is open), the printer recognizes this state.

Potential Workarounds

Inspect the Switch:

• Open the printer and locate the mechanical switch that senses the door position. It’s usually a small button or lever.
• Check for any debris or misalignment that might prevent the switch from functioning correctly.

Bypass the Switch:

• If you're comfortable with basic electronics, you can attempt to bypass the switch:
  • Identify the wires connected to the switch and carefully disconnect them.
  • Use a jumper wire to connect the two wires together, effectively simulating a closed door. Ensure the printer is powered off before doing this.

Tape or Shim:

• If the switch is not functioning due to misalignment, you can try to create a temporary shim or tape that holds the switch in a "closed" position. This is not a permanent solution, but it may help you continue using the printer for a while.

Software Reset:

• Sometimes, performing a factory reset can resolve sensor issues. Refer to the user manual for instructions on how to reset your specific model.

Note:

• Safety: Be cautious when working with electronics. Ensure the printer is unplugged when you are opening it up to avoid electric shock or damage to the printer.
• Recycling: If you do ultimately decide to retire the printer, consider recycling it responsibly through local e-waste programs instead of sending it to a landfill.

I hope this helps.

Take care and have a good day.

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Alden4

HP Support