Zebra GK420d not calibrating fix by changing flat ribbon cable

Zebra GK420d not calibrating troubleshooting and repair by changing flat ribbon cable. How to check if label gap sensor is working properly. Why Zebra printer is not calibrating? How to change flat ribbon cable.
You can find new cable here: https://www.ebay.co.uk/itm/Zebra-GK420d-ZP450-ZP505-Mainboard-Feed-Button-Cable-Printer-Not-Calibrating-Fix/224085389851?hash=item342c87b21b:g:abcAAOSwfRZfGXd4
At 5:00 I explained how to check if sensor is working properly. If you don't see spikes on sensor profile first idea would be that sensor is faulty but not always it is the case. Both and sensor and cable issue can lead to sensor profile without spikes because top sensor signal is going to motherboard through this cable. So there is no simple way to tell which is faulty but in most cases it will be a cable fault.

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