uh oh. I hope the optics didn't move.
They're all fixed pretty well, but maybe the long L mirror moved in it's bracket? it's the long mirror on the base of the optical bed, accessible through the side door. Some people remove that for cleaning, which I never heard of doing in training and sounds ridiculous to me to do.
The next stop after the L Mirror is past the shutter and the removable plastic lens that you can take out of the side of the machine.
So, another thing that happens before and during exposure, as the spin motor reaches speed and laser comes on, is that the laser light is sweeping across the width of the film, and the spin motor is acting as an encoder, but for a synching pulse, the light hits a small shiny metal surface, off the edge of the largest film size, and reflects down to a detector. this makes a pulse for the timing of the optics/imaging. You might be starting up and this pulse cannot be detected, hence Error 15.
There is a trap door where you can access this sensor, sort of, and at least see it, and see light reflected onto it. If it were intermittent, I would recommend cleaning the sensor on the board. It's a small sensor, flat square plastic, near the end of the board. If you observe this on your machine, you might see the light missing this sensor. I wouldn't recommend moving the ASens board if it looks like something else were moved. That would be a last ditch effort. If that worked, all bets would be off as far as image quality, size, distortion, etc. So right now, that current ASens position is your best bet for getting any other optics back in position.
Good luck.
