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I believe "state 19" is a weak main illumination bulb. Not sure if it's the same on your 740, but that's what the problem was with our 750i. Even though the bulb appears to be working, they dim over time and won't pass the start up calibration checks. On ours, there is a round access panel on top of the unit to service this bulb. Just be careful removing the bulb and don't bump any of the clear optical wheels. Part # 2660021106082 (for 750i. not sure about 740) Call Zeiss to confirm. Realize this is an old post so info is for future readers.
This is very funny. I was just looking to find a similar solution for my laboval. Haven't measured it yet, but it keeps blowing the light bulbs. Do you run it at 110 or 220V?
I would take your monocular to Radio Shack which has an extensive line of battery replacements and a knowledgeable staff that will most likely be able to replace it for you!
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