Fix Epson Workforce 645 Printhead Lock Error

Question:
Why is the printhead in my Epson Workforce 645 stuck and not transitioning? When I power the printer, I hear noises because the printhead is trying to move but cannot return to its parking position. Could you send instructions on removing the printhead lock mechanism and troubleshooting this issue?
 
Answer:
Thank you for contacting us! I'm sorry for not responding sooner. While no level of frustration is ever appreciated, printer problems such as this can be immensely aggravating, and we know how important it is to get to the root of the hardware problem. At BCH Technologies, we know you have many options for all your printing needs, so we are here to help in every way possible! Thank you for your engagement and support of our YouTube channel (https://youtube.com/@bchtechnologies), which allows us to continue improving our technical expertise.
So, let's discuss the problem with your Epson Workforce 645: the printhead lock mechanism cannot move.
 
Step-by-Step Troubleshooting
 
Reboot And Unplug The Printer
Please switch off the printer and disconnect it from the power outlet before you look over or make repairs. This is for your protection and to prevent damage.
 
Get to the Printhead Lock Mechanism

• Could you lift the printer cover to access the printhead and its locking mechanism?
• This lock is located on the printer's far right side, where the printhead parks at the capping station.
• Check the area for blockages from dried ink, paper, or anything else that could prevent the lock from disengaging.
• Carefully move the lock mechanism as needed to unhook the printhead. And don't use too much force.

Check and Clean the CR Encoder Clear Cable

• The clear encoder cable stretches horizontally in front of the printer and is critical to determining the printhead position.
• If this cable is dirty or smudged, it could trick the CR (Carriage Return) sensor.
• Wipe the cable with a lint-free cloth soaked in isopropyl alcohol (90% or higher).
• Could you make sure the cable is seated correctly in its connectors?

Check the CR Sensor

• The CR sensor reads the encoder clear cable and tracks the printhead movement. A dirty or misaligned sensor might cause erratic behavior.
• Release the dust off the sensor using compressed air or a soft brush.
• Replacement may be necessary if the sensor looks damaged or doesn’t work.

Open the Printer’s Mainboard

• The mainboard could be the culprit if the printhead lock mechanism and other parts are functional.
• The mainboard controls the printhead motor, which interprets signals from the encoder cable and sensor. A failure here can cause the printhead to get stuck or jam.
• You may need to have the mainboard checked by a professional to see if it needs repairs or replacement.

Reassemble and Test the Printer

• After cleaning and reviewing the required components, you can reassemble the printer.
• Could you reinsert the plug and turn it on? Do you see the printhead move freely now and return to its parking spot?

 
Additional Notes
If this doesn’t work, you might need to look more in-depth into components such as belts, rails, and motors. Loud noises from the printer, while it is starting, can also cause problems with the pieces.
Trust me, it's a glorious affair, as dealing with a printer issue is an elaborate affair because of how many tangential things can go wrong. As a result, we can’t offer remote troubleshooting, recommendations, or printer-repair assistance. We also provide an in-person evaluation and repair service through our local diagnostic center (https://bchtechnologies.com/printer-repair-service). Still, our services are in such high demand we are currently scheduled out a few weeks before we can accept your printer for onsite drop-off on a first-come-first-served basis.
We can provide the full printer or individual parts and will let you know how to proceed. However, we recognize that our rates may not fit everyone’s budget. For Do-It-Yourselfers, we recommend using online sources. Go to our YouTube channel (https://youtube.com/@bchtechnologies) and search for your problem. YouTube’s algorithm can also recommend videos from other creators who might help.
Thank you once again for your inquiry. We hope this step-by-step guide helps you solve your printhead lock problem. Feel free to contact us if you need more help or advice!