screen is not bright?

Hi. It is usually caused by the power supply filter electrolytics. They dry out and fail with age. If you haven't had the battery changed, it is a good idea to have it done while the other problem is being fixed.

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If anyone needs a JCM G211 cash register manual, one of the users has it here:

http://the-checkout-tech.com/manuals/cashregisters/JCM_G-211_owners_and_programming_manual.html

James K
June 2014