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Hi,
I love the temperature compensation board fix of soldering a jumper from pin 1 to 3- I just wasn't crazy about soldering on my instrument cluster in the event that I ever wanted to revert, etc. IPD's jumper is a neat solution but $15 plus shipping cost and I especially didn't want to wait on the part. So, I took the bad temp compensation board, scraped the printed circuity off around each of the four pin connecters with a utility knife and soldered a jumper on the board from pins 1 to 3. Voila! My own little jumper kit. I checked it with an ohmeter to make sure only pins 1 and 3 had any continuity between them to make sure I had scraped enough. It works great!
Someone may have already come up with this but I couldn't find it in the archives so forgive me if it is redundant. Also, thanks to whoever originated the 1 to 3 jumper idea. Info like that is why I love the brickboard.
Thanks!
Lyle
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Clever idea, though all things considered I can't imagine why anybody would want to revert back to the original setup.
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There's another way. European 240s didn't use the compensation board, and instead came with a jumper from the factory. There are holes already drilled in the board for the jumper, all you have to do is run a wire between them and solder it to the board. It does require a bit more disassembly, but then you've done it the way the factory did.
--
1991 245, 61k miles, looking for a 5 speed 92-93 245 cheap.
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Gentlemen,
I tried to jumper the compensation board before, but I could not get it to work... is the key scraping off all the printed circut? Instead, and in the end, I opted to replace the board with a new one from FCP. Works fine, for now.
Sometimes, rather than post what I feel has been discussed ad nausium, I utilize the FAQ. More so in the last 6-7 months... and, if you noticed, I have begun posting again.
Good post... I learned something today!
Thanks, Jon
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Hi,
I'm not sure about the scraping off being key but it seemed to make sense
that I wanted to eliminate all the other functionality on the board and took
about a minute with a utility knife.
Thanks!
Lyle
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Seems like a good use for those worthless compensation boards! I had tried to find the female connectors like those on the board that fit on the pins but was unsuccessful. You have found a way to use the originals.
Randy
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This is also a good way to find out what actually dies. The more common problem as I've heard it, was you rapped on the dash to get the gauge to behave again, not a hard component failure on the board. The fault, as described by the Bentley and others, is in the connection between those pins and sockets, partially blamed on excess flux getting in the way.
So if you didn't see any burned resistors on the TC board, a fix might have been in the scraping that happened when the board was removed and reinstalled.
Another way to avoid soldering is to wrap the pins with the jumper wire. A wire-wrap tool makes it a breeze, but lacking that, a bit of dexterity and a needle nosed plier will do just as well with results.
--
Art Benstein near Baltimore
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Judging from my car's past service records, it appears that the temp. compensation board in my dash has been tampered with (I'll know for sure on Monday when I have a tach put in place of the clock), and as a result, my temp can typically hover around the "10-10:30" mark. In the winter, I can lower the temp by blowing the heater fan on low. But I wonder about the summer time. Is it OK for the temp to get remain at that same temp?
Just wondering.
--
'90 245 DL 253K M47
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posted by
someone claiming to be TCB pins
on
Sat Jun 2 12:39 CST 2012 [ RELATED]
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Pictures not showing up. How does one tell which of the 4 pins are pins 1 and 3?
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You have to be a registered user for 8-year-old image links to work. Just kidding, you can remain anonymous. http://cleanflametrap.com/tempFaker.html
--
Art Benstein near Baltimore
All the trouble I've ever been in started out as fun.....
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posted by
someone claiming to be TCB pins
on
Sat Jun 2 15:49 CST 2012 [ RELATED]
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Hi Art, Thanks for the link. In the unlikely event that the images disappear at some point in the future on that site as well, the pin order, when read from the speedometer to the gas gauge, is 1 2 3 4.
-Ihor (380K '88 244)
PS, Now if I can only remember my uid/pwd that I set up years ago all would be well. Have a great weekend!
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Send an email to Stenberg, Jarrod
E-mail Address(es):
jarrod@denizen.net
Ask him for a new password. He should be able to look up your name and get your handle.
--
My name is Klaus and I am a V ♂ lv ♂ holic
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I can't see a reason for a "fix" on this component, Art. The thing is just a PITA and is not needed. I really don't see any difference in the temperature gauge behavior other than it works all the time after removing the board!
I like the wire wrap idea on the pins for those who are uncomfortable with soldering the jumper in place.
Randy
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You are absolutely right. Furthermore, I resent being lied to by a gauge.
Some time ago, and I didn't date my notes, I started comparing the half-dozen or so TC boards I'd accumulated, coming to the conclusion they were all functionally alike, just assembled slightly differently to improve the board layout.
Then I used a protractor to find the gauge face is actually an arc from 8:00 at the bottom extreme to 10:00 at the top of the red - just so we can agree on what 9:00, 8:30, etc. really indicates.
Following that, I used a variable resistor to map the sensor resistance to gauge positions with and without the TC board in the circuit-- and effort to see just how "big" the lie is.
The TC board uses a voltage comparator with two setpoints to determine a range for which the gain of the circuit is modified. The result is a reduction in meter deflection for the middle range temperatures only. That still is supposed to let it fly to the top when it crosses the upper comparator boundary, and bring it off the bottom quickly while it is first warming up.
All in all I just convinced myself I didn't want the thing in my car.
--
Art Benstein near Baltimore
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Sir,
You are indeed the Temperature Compensation Board King. I bask in the glory reflected off of you. The testing you describe is the best "I know my car inside and out" story I have ever heard. You have my respect. No kidding.
Kind Regards,
--
1985 244GL - St. Joseph, Missouri
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Art, you have the soul of a scientist! I agree with you about wanting all guages to tell the truth.
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