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How do i switch my samsung ER4915 cash-register to service mode?

How do i switch my samsung ER4915 cash-register to service mode?

Please include details like where, what do I use, and how.
Mark Nguyen, December 2008
Hi.
Turn the key marked 'C' around to the 'S' postion on the mode lock.
Be very careful when in this mode. If you accidentally clear the whole machine, you could be up for a lot of system programming. Do not use S mode unless you really need to.

Mark, December 2008
link Click here to see other fixes for Samsung ER4915.