Check the flash sync speed on the cameras. With most film cameras, the flash sync speed is 1/60 of a second.
With digital cameras, you must use a flash rated for the digital camera and use their recommended flash speed.
If the camera to flash sync speed is correct it is possible that the flash output is weak. This would be due to the battery not being able to properly supply, or some defective components in the flash circuits.
You will require a flash sync detector, a flash intensity meter, and a battery load tester to perform the the first level of basic tests if you wish to analyse the fault yourself.
This is not a problem you could service yourself, unless you are experienced and knowledgeable for servicing flashes.
These flash units use very high voltage at a very high current when operating. The current is built up and stored in a very efficient high voltage capacitor. A flash can be dangerous to service yourself.
Jerry G.
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