You can face this problem if

1. You have a mechanical problems in the loading encoder. Make sure the encoder rubber ring is well in place and not rotated.
2. Check that the encoder rubber is touching the film guide ( the film guide that is against the Rocker) continuously while you are rotating it 360 degrees few times.
3. The DC MOTOR DRIVER is defective. In such cases you might see that the motors are working intermittently (try with and without film).

The reason might be that ACC. Cass. Encoder is touching the plotter moth .

The DC MOTOR DRIVER is defective. In such cases you might see that the motors are working intermittently (try with and without film).

Among the regular things watch the loading Cassette force, it shouldn't be more then 500gr. If it is check also the Break (the white plastic break that hold the shaft from rotating freely. Check that there is no glue between this break and the loading cassette shaft.

1. The blue coupling is not in place and a strange noise
2. We can see that certain Lead Screws have lower shoulders, from the stepper replace the lead screw.

Among the rest try to change the D. Ratio in the format.

If you will connect a KB and monitor and turn on you will see the DOS error massages. Probably you lost the hard disk partitions or lost the CPU board setup.