Cyberlight SV lamp, fan issue

It could be one of three things - either a bad fan, or the fan control circuit on the PCB, or simply the cable to the fan is loose or bad. Considering that there are no other fans on the Cyber-SV, you can't simply see if something else is running . . . and changing the fan is less than trivial.

First, see if the fan is free to rotate . . . if so, it then is most likely not at fault, and you will need to pull the back of the fixture open, and check the fan connectors on the main PCB and ensure that the fan is indeed plugged in. Also check fuse F4 - it is for nothing but the fans, and if it is open, they won't run. Assuming that the fuse is good, you should see 24V DC across all three fan connectors (note that the fan circuit is switched on the ground side, so you should also see 24V DC to ground from the fan connectors at all times . . . If there is a problem with the fan control, then T3 and T4 are your next place to look - T4 switches the power, and T3 is a buffer. (All this is on page 7 of the schematic available online from High End).

And yes, with no fan, the fixture will definitely overhead. The heat in the Turbo is such a load, they add two more fans to the one already on the -SV. Myself, I'm amazed that you get 10 minutes . . . Oh, and a faulty temp switch can also cause an errant overtemp, but trust me, with the fan off, that's not the problem . . . the fans on a Cyber run constantly, and are not temp regulated, so if it's not running when the fixture strikes, you found the cause of the overtemp!

- Tim

It could be one of three things - either a bad fan, or the fan control circuit on the PCB, or simply the cable to the fan is loose or bad. Considering that there are no other fans on the Cyber-SV, you can't simply see if something else is running . . . and changing the fan is less than trivial.

First, see if the fan is free to rotate . . . if so, it then is most likely not at fault, and you will need to pull the back of the fixture open, and check the fan connectors on the main PCB and ensure that the fan is indeed plugged in. Also check fuse F4 - it is for nothing but the fans, and if it is open, they won't run. Assuming that the fuse is good, you should see 24V DC across all three fan connectors (note that the fan circuit is switched on the ground side, so you should also see 24V DC to ground from the fan connectors at all times . . . If there is a problem with the fan control, then T3 and T4 are your next place to look - T4 switches the power, and T3 is a buffer. (All this is on page 7 of the schematic available online from High End).

And yes, with no fan, the fixture will definitely overhead. The heat in the Turbo is such a load, they add two more fans to the one already on the -SV. Myself, I'm amazed that you get 10 minutes . . . Oh, and a faulty temp switch can also cause an errant overtemp, but trust me, with the fan off, that's not the problem . . . the fans on a Cyber run constantly, and are not temp regulated, so if it's not running when the fixture strikes, you found the cause of the overtemp!

- Tim