919 moisture tester repair. - The Combine Forum
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post #1 of 19 (permalink) Old 09-16-2019, 05:42 PM Thread Starter
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919 moisture tester repair.

Has anyone fiddled with their 919 meters?
Ours was bought new by my grandparents, was updated later to the larger diameter cell. And that was probably 30 years ago, never been in for any work since...
Yesterday we turned it on and the needle isn't moving like normal, to calibrate or even when testing the needle wont go below half scale ..
And is not as touchy as usual.
I opened it up and it still is equipped with vacuum tubes.
They seem very simple internally and just wondered if anyone know anything technical about them.
I imagine it could be something as simple as a popped resistor or capacitor??
Maybe even a tube?
I found how to test a tube online, havnt done it yet... [trying to combine peas right now]
But I'll dive into it on a rain day.
Thx


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post #2 of 19 (permalink) Old 09-16-2019, 10:16 PM
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Dimos in winnipeg says they service all 919 meters same day service most times.
Which with shipping means a week or more.
Unless the courier can get it there quick.
Maybe here is closer to you?
Desna Controls - Service & Support

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post #3 of 19 (permalink) Old 09-16-2019, 10:27 PM
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Different area than you guys. Have had ours in for service a couple times. Both times was the same thing. I can't remember what it is now. The guy at Agassiz Seed and Supply in Fargo said it was caused by brown outs. If it's plugged in and the power flickers it does it. It sounded like it was something simple. If you call a place that repairs them they might be able to walk you through some troubleshooting.
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post #4 of 19 (permalink) Old 09-16-2019, 11:50 PM Thread Starter
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I was hoping to send it away as a last resort... I have another that I verified accuracy today that we can use... I just enjoy fixing stuff myself. It's how I learn.
With the number of these testers out there I was sure someone who understands electronics a but better than I do would have played with one...

Heres a pic of the wizardry inside of an old original one if anyone has ever wondered...
20190916_210543_1568692226715.jpg
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post #5 of 19 (permalink) Old 09-17-2019, 01:11 PM
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When was it used last? I am putting money on the potentiometers oxidized up after sitting, even for the season. Grab yourself some electrical contact cleaner and spray it on the pots working them back and forth. Just make sure to let everything dry before putting power to it. Isopropyl alcohol can be used to, just don't use anything like wd-40.
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post #6 of 19 (permalink) Old 09-17-2019, 03:49 PM
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10 years ago a new needle and calibrate was almost cost of new, i got 3 dead ones that can stay that way.
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post #7 of 19 (permalink) Old 09-17-2019, 05:49 PM Thread Starter
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Quote:
Originally Posted by Beerwiser View Post
When was it used last? I am putting money on the potentiometers oxidized up after sitting, even for the season. Grab yourself some electrical contact cleaner and spray it on the pots working them back and forth. Just make sure to let everything dry before putting power to it. Isopropyl alcohol can be used to, just don't use anything like wd-40.
I dont think there's any pots in this vintage of a unit... other than the 2 between the vacuum tubes [which I assume are for fine calibration, which I dont want to mess with yet]
The dial and external calibration knob are a non contact type.... I believe they're a capacitive variety.
They have metal discs that do not touch but Introduce more surface area as they're adjusted.

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Originally Posted by makar View Post
10 years ago a new needle and calibrate was almost cost of new, i got 3 dead ones that can stay that way.
I searched online and found a company that will upgrade to full digital for just under $600, a new one is about double that these days I believe.

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post #8 of 19 (permalink) Old 09-17-2019, 10:01 PM
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Someone said to me years ago what causes those things to go out of calibration was the tube leaks?
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post #9 of 19 (permalink) Old 09-17-2019, 10:51 PM
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Last time I talked to the guy at Dino's, he said he was swamped with guys that had went digital and wanted them switched back... not sure what the reason was but he said "too many issues." I almost bought the Ag Days special from him a few years ago, but ended up with one from an auction sale that has been working so good I've never had to touch it.
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post #10 of 19 (permalink) Old 09-17-2019, 11:33 PM
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What I did was go digital, with a few cal was over 900, plus no one told the ahole to change it.

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