Troubleshooting - lights

Lights not working?

As with all technical problem solving, the best way to find out why lights aren't working is to work through all parts of the system methodically and patiently. Different problems are more likely at different stages of the process - for example, if a light that was functioning correctly has stopped working, it's more likely to be a blown globe than a patching issue. 

Remember that there could be multiple issues that need to be addressed - for example, a globe can blow and cause a circuit breaker to trip.

Is it a hardware or software issue? 

Make sure the problem isn't with Vista, by checking the Vista - Troubleshooting procedure.

From the stage of the production you're at and what the fault is, it should be fairly clear if the fault is with hardware or software. If none of your lights are working, it's probably software.

Operator error?

Make sure you have the correct light selected and are operating it correctly.

Is the circuit switched on?

This may occur when rigging, or when other users are sharing circuits.

Is it patched correctly?

If you've just patched, there could be an error. Check the circuit number for the light, and that it is patched into the correct dimmer number. Make sure it is plugged in firmly at the dimmer, and at the circuit.

Similarly, if someone else has been patching, they may have inadvertently unpatched your light. This is why it's very important to keep an up-to-date patch sheet, and communicate clearly with other theatre users.

Is the light correctly assembled?

For Pacifics, it is easy for the base (with the red "handle") to come away from the body, releasing a safety microswitch. Make sure it is firmly seated.

Is the globe blown?

For newly rigged lights as well as lights that were previously working, this is a likely fault. Try plugging it into a circuit/dimmer known to be working, or straight into power (called "hot leading"). If the light doesn't work, you know the fault is with the light, probably a blown globe. Follow procedure to change the globe, or swap out the whole unit and mark it for attention.

Problem with the dimmer?

If the light works and it's patched correctly, there could be a problem with the dimmer. On the back of the dimmer unit, check if the circuit breaker has tripped - they should all be switched the same way. Reset the tripped breaker and try again.

Also check if the three-phase power outlet has tripped. On the wall behind the dimmers are three large switched outlets where the dimmers plug in. Make sure a red light is showing on each of them to indicate functionality. If an outlet is switched on but no red light is showing, lift the clear plastic cover and reset the breaker.

If the breaker hasn't tripped or it doesn't work when reset, try patching the light into a different dimmer. 

Note that one of the causes for circuit breakers tripping is overloading of dimmers. Ensure you have not overloaded the dimmer.

Problem with the circuit?

The circuits all have two outlets - try swapping the outlet being used, making sure you switch it on. If you discover a problem with a circuit, mark it with tape and inform the Production Coordinator immediately.

If you have tried all these things and still can't get the light to work, seek staff support.