I bought a Sigma EF-430ST. After it is switched on all the red numbers blink but the LED (ready) does not come on and the test button does not "test". I can hear a high pitch sound when it is on. What can it be?
Lukas
This indictates one of 2 condition.
1. Batteries Flat
2. Information Fault.
More than likely the second is your issue.
if you here a whirring sound when the flash starts then your fault is possibly that the inner head in the flash can not move in it chamber to adjust for the focal length of the lens.
You need to remove the 10 screws (5 each side on the head) 1 is located at the front and 4 under the plastic cover at the swivel point of the flash. These are covers are held in by twin sided tape and can be pulled off.
Now in front of the circuit board is a motor and gear - just in front f this is the flash tuble and the chanber - click the tuble back into the chamber and ensure it moves freely.
You can check that all is working now by installing the batteries and turning the unit on - should settle at 28.
Once working reassemble and all should be fine.
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