Armin Szilagyi Posted June 1 Share Posted June 1 Hello everybody! I recently purchased a quartz controlled motor for my Arriflex 16 St, however unfortunately it's not working. Apparently this is a super rare motor made by ARRI (Quarz - Antriebs - System, Typ: A 16 St E), and there is little to no information about it on the internet. I wonder if anybody reading this forum has any documentation about this motor, preferably schematics. I managed to find somebody who's willing to fix it, but it would make our life a 100x easier if we had a starting point. Thank you. (1st picture is from a video on youtube by youtuber "Fresh Ground Pictures", 2nd is my motor) Link to comment Share on other sites More sharing options...
Fabian Schreyer Posted June 2 Share Posted June 2 Is the second picture showing your device? Looks like it has been seriously tinkered with. Link to comment Share on other sites More sharing options...
Selinica Harbinger Posted June 5 Share Posted June 5 Do you have some photos of the board(s) and wiring? It won't replace a schematic but it may help identify a general view of what is going on there and make things slightly easier. Most likely though you've got some early form of a PLL controlling the motor speed with a reference crystal of some sort. It might be the same or similar to the guts of another ARRI crystal camera too. Link to comment Share on other sites More sharing options...
Armin Szilagyi Posted June 7 Author Share Posted June 7 On 6/3/2024 at 1:37 AM, Fabian Schreyer said: Is the second picture showing your device? Looks like it has been seriously tinkered with. Hi Fabian, I guess they made a remote vari-speed control, I don't think it should affect the motor that much. On 6/6/2024 at 1:36 AM, Selinica Harbinger said: Do you have some photos of the board(s) and wiring? It won't replace a schematic but it may help identify a general view of what is going on there and make things slightly easier. Most likely though you've got some early form of a PLL controlling the motor speed with a reference crystal of some sort. It might be the same or similar to the guts of another ARRI crystal camera too. I'll try to take some photos, it's with the gentleman who should repair it. I reached out to ARRI, apparently they don't have the schematics anymore, or it's way too deep in the archives. Link to comment Share on other sites More sharing options...
Fabian Schreyer Posted June 7 Share Posted June 7 On 6/6/2024 at 1:36 AM, Selinica Harbinger said: Do you have some photos of the board(s) and wiring? It won't replace a schematic but it may help identify a general view of what is going on there and make things slightly easier. Most likely though you've got some early form of a PLL controlling the motor speed with a reference crystal of some sort. It might be the same or similar to the guts of another ARRI crystal camera too. That is always possible via the auxiliary port of the A 16St E. I think the "mod" displayed here is just about prolonging the potentiometer leads, so the camera speed can be controlled from somewhere else. Link to comment Share on other sites More sharing options...
Armin Szilagyi Posted June 7 Author Share Posted June 7 3 minutes ago, Fabian Schreyer said: That is always possible via the auxiliary port of the A 16St E. I think the "mod" displayed here is just about prolonging the potentiometer leads, so the camera speed can be controlled from somewhere else. Sorry for expressing myself incorrectly, that’s exactly what I meant. Link to comment Share on other sites More sharing options...
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