[Moved] power problem with a laser unit

[zensealiu]

One friend gave me one laser unit which supposedly emits a red laser beam (about 300mW) with one foot control pedal and one display panel. The unit comes with one power supply (12 V DC, 4.5A) which is functional correctly (verified by a multimeter). When I turned the power switch on the unit, I saw the display panel blinked and indicator light one switch blinked as well, at the frequency about 2 HZ, two pulses per second. It seemed to me there is something wrong with the circuit inside the unit which changes one DC power to the pulses.

Could you instruct me how to repair the problem

 

[tggzzz]

The major power problem with such lasers arises when there is a reflection and a very small proportion of the light enters the eye. As the professionals say, "do not look as laser with your remaining eye".

I don't care if you blind yourself; that's "evolution in action". I do care if you, accidently or otherwise, blind someone passing by. If you did that to me then I would do everything in my power to ensure you did not pass your genes onto the next generation. Seriously. No joking.