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Speedometer erratic for about 1 minute then works fine 900

posted by  jd620 on  Tue May 20 07:22 CST 2014
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last visit: Fri Oct 17 07:42 CST 2014
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I bought a 940 at Copart for my daughter and have two problems left which I have posted for help. This speedometer problem is one of the last two problems I know of although insurance is effective today so I may find some more as I drive it. I read the FAQS and have resoldered all of the joints on the flexible PCB, replaced the plug on the differential sender, put the rear end up on a jack and run the car while pressing on the PCB various places trying to find a break, and have had no luck finding the problem. For the minute the speedometer is not working right, at first it is dead, then jumps around, and then is normal. Does this sound like an electrolytic capacitor problem or ?
--
Mine: 4-940s running, 2-740 and 1-940 parts cars, and 3 1959 John Deere 630s (1 for parts), dtr1:3-940s, dtr2:1-740






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