Jerry-TS-MkII
Joined: 23 Aug 2017
Posts: 79
Location: Indiana
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 Posted: Mon Aug 10, 2020 9:12 am Post subject: EIS failures |
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Re: Has anybody ever had a problem with their EIS showing false readings
mostly concerning CHT's and every thing else, but not turning on the red
warning light?
The EIS is computer based.. so if ALL of the indications, and/or alarms
are not correct, it's not as likely to be a sensor problem. Considering
the age and noted usage, (and having been a electronic engineer and tech
for my whole life), you may have electrolytic capacitors breaking down.
They have a very limited life span, as compared to any other electronic
component, and heat is another problem for them. They are often used in
power supplies and in the filtering. Depending on your power source, and
how noisy it might be.. electrolytic caps see major constant fluctuations
across their terminals. Not an exact correlation, but think of bending a
piece of aluminum back and forth over time. Many times, to service old
equipment, ALL of those caps will be pulled and replaced! They can usually
be identified as a small aluminum can, with a heat shrink cover, which
includes a Plus or Minus sign on one leg, and the value and rated voltage.
They often swell, or even pop their top, but some times the effective value
just falls too far from nominal. I would assume the circuit is using a
voltage regulator, intended to keep the microprocessor and associated input
conditioning circuits happy. But if a input cap fails, and you have
excessive voltage spikes on your buss, it can take out a regulator. You
would need a scope to see that, but you might be able to get a digital
voltmeter to read the Vcc. If you can power the unit with a known good
battery of correct voltage, that would eliminate problems with your AC
buss, as it too has a regulator circuit, and likely electrolytic caps in it
as well.
If you call the MFR, they will likely want to know voltage readings.
Post again, if you have more questions on it. Be safe!
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