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Message
Thank you all for your advices
and specially Brent Regan whose advice definetely solved my
problem. No help at all from the VM1000 company now overtaken by JP
Instruments showing no interest at all to help old customers. What should we do
without the LML forum? I have a Lancair IV with a 14 volt system and my
problem was that VM1000 went dark when voltage dropped below 13 volt which
happens all the time when you activate the hydraulic pump. VM1000 should
work down to 9 volt. From the beginning my VM1000 worked fine but 20 hours from
first flight the problem started.
The reason for this reset was a
resistor R26 in the DPU (Digital Processing Unit) that had changed from 10
ohm to 35 ohm. This is a serial resistor feeding a 5 volt regulator. The input
voltage to the regulator became too low and the regulator could not deliver the
right voltage to the connected IC (Integrated Circuit).
When changing the resistor to the right value the VM1000 function down
to 9 volt. The faulty resistor was not burned but had for some reason change its
value.
Thank you all!
Christer Wretlind, Stockholm,
Sweden
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