Access ATB420 Series Service Manual page 33

Access keyboards ATB 420/421 Multi-Function Keyboard Product Specification and Service Guide
After clicking on YES US keyboard layout will appear on the screen as illustrated below
3.
Carefully click on each individual button to check for both open-circuit (will remain red),
4.
closed circuit (will go black) or make circuit (will go green). When all switches go green
the test will be passed
Be careful not to click two keys or click repeating the same key at the same time, as this
5.
will make the keys go blue. You can abort if this happens and start the test again.
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