MetroLux II, How the Memory Works, Problem & Fix

I'll probably put this a couple of places here. I just repaired a MetroLux II for a customer. It had a voltage problem, something we have seen on a couple of units. Not hard to fix. Then I sent it back and that problem was fixed, but the customer questioned the memory. It was giving strange numbers, changing on its own, and the beeper was beeping at the wrong interval. Very odd. Everything else seemed to work.

First thing to know is that the memory can be completely re-initialized by turning on MetroLux while holding SETUP button down. This will load a series of numbers into LUX, TIME, Cal#, etc. They should be 1.1, 1.2, 1.3, 100%, 2.1, 2.2, etc. The second thing to know is that the re-initialize is not complete until you hit EXPOSE the first time. This is true anytime you change any numbers that resided in memory: they are not written to memory until you hit EXPOSE once. Doing this can clear a number of apparently unrelated problems.