Resolving Error 71H on Epson L1800: A Detailed APG Home Position Seeking Error Guide

Question: I followed the steps in the video, but my Epson L1800 always shows error 71H, even when I buy three engines. What might be causing this issue, and how can I fix it? Guys, I'm seriously asking for your support!

Answer: 

Error code 71H – APG home position seeking error – can be caused by several things:

A foreign object stuck on the sensor, failure of the APG unit (most probably due to a reassembly being done incorrectly), misalignment or damage of the sensor, or a disconnected or loose cable.

Check error code—The error code can be correctly logged by adjusting the program or printer info screen; misalignment or obstruction can sometimes trigger false errors. Then, closely examine the APG sensors for debris or misalignment. These are sensitive devices; failure can occur if the sensor legs are slightly damaged. 

Next, go through the APG assembly carefully: disassemble the unit to confirm that no components are worn, misaligned, or improperly rejoined; check our step-by-step video guide here [https://youtube.com/watch?v=G_lZLqRH_f0] for detailed instructions. You could also check all the cables associated with the APG assembly; a bad connection or loose cable leads directly to a 71H error. Suppose the sensors and cables all seem in order and therewithle damage. In that case, it is worth replacing the fault indicators if they can be found in our store [ https://bchtechnologies.com/epson-photointerrupter-widely-used-as-pe-sensor--apg--automated-platen-gap-sensor-others--l1800-1390-artisan-1430-wf-3620-wf-3640-wf-4630-wf-463x-series ]) If the entire APG unit is at fault it may need to be replaced, i.e., we have a no return APG unit for the Epson Artisan 1430 here [https://bchtechnologies.com/no-return-apg-unit-for-epson-l-1800-1390-and-artisan-1430/] also test the small yellow sub-board (relay board) ensure that the ASF sensor is seated correctly. Any breakout board repins routing the APG signal is set. 

When it comes to printers, dealing with issues can be messy: printers tend to be hands-on devices, and such problems are often best dealt with in person. In other words, we can't do remote diagnostics and advice or physically fix printers. Our local diagnostic facility [https://bchtechnologies.com/printer-repair-service] provides in-person evaluation and repair services. Due to demand, we are first-come, first-served, and your printer might have to stay in line for a few weeks before you can drop it off. Our services are set in place on the whole printer or specific component arrangements with particular straightforwardness on how you can do it. However, we admit that our rates aren’t the cheapest. So, we strongly advise you to turn to self-help through internet searches. One suggestion would be to jump over to YouTube and see what's there or on our BCH Technologies YouTube channel [ https://youtube.com/@bchtechnologies ]; you can even search the channel via the search icon shown next to "About" on the right-hand side of the menu bar. I am bombarded with questions every day about videos on particular topics. After nine years of making videos, it’s hard to remember everyone. So, the best option would be to use the search function on YouTube. Plus, YouTube could recommend relevant videos from other channels that may help you. Thanks for being a loyal member and for your continued support. We greatly appreciate your business and can assist you in printing and running your printer to its finest.