Originally Posted by
OMD-227
I've had this a few times now..... It took me ages to work out what was going on, but now I fix this quickly each time. Its not the harness or finisher PWB.
F1-19 & F1-20 are Finisher Pre-Alignment motor trouble (front & rear).
Basically, the staple unit runs front to rear along a lubricated shaft. There is an arm & sensor assembly attached the back of the staple unit. As the staple unit moves along the shaft, it passes 3 points which activate the arm & sensor on the back of the staple unit. The 3 points indicate where the staple unit is located along the shaft. There is one at the front, one in the middle and one at the rear. The 3 points look like small white plastic triangles. The highest point of these small white plastic triangles, activates the sensor & arm on the back of the staple unit, which tells the staple unit where it is........ hope that makes sense.
Your trouble code is caused by a slow return (or no return) of the sensor arm on the back of the staple unit. As the staple unit passes the middle point, the sensor arm is not responding when it gets to the rear point (where the staple unit is set to fire the staple).
If you were performing a staple job selecting the 3rd staple option, you would get F1-19, which is the front pre alignment trouble, as the staple unit cannot detect where the front staple position is.
I am attaching some pictures of the points which should be cleaned & lubricated. If you take the finisher out of the machine and run the staple unit back & forth with your hand, you will see the sensor arm responding slowly after passing the 3 position points. Once the sensor arm is cleaned & lubricated at the joints it sits on, the sensor arm responds quickly and activates the sensor.
You'll understand more when you have it out in front of you. There is the possibility that the sensor on the staple carriage is bad which would also cause this, but each time I've seen this, it was always the sensor arm responding too slowly, as the carriage moves quickly along the shaft.
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