[200q20v] Re: Bouncin' speedo
ekellock at juno.com
ekellock at juno.com
Fri Sep 29 09:42:44 EDT 2000
I performed this procedure a couple of years ago.
It worked great. I was digging around trying to find
it to send. Thanks Chris!
On Fri, 29 Sep 2000 08:20:36 EDT C1J1Miller at aol.com writes:
> In a message dated 9/29/00 1:44:32 AM Eastern Daylight Time,
> Doyt at nwonline.net writes:
> > I have a 91 200 20v tq with 156k and it all-of-a-sudden the speedo
> > intermittently started bouncing when I'm driving. It will bounce
> 5mph+ (
> > 50-55) Is this something electrical or mechanical? How can I fix
> it ......?
> > Thanks
> "Fixing the electronic spedometer
> Date: Mon, 18 Oct 1999 08:09:18 -0400
> From: Robert Myers <rmyers-at-inetone.net>
> Subject: Bouncing speedo fix
> Several years ago I encountered the proverbial bouncing speedometer
> problem. Since several posts have indicated that this is a
> problem I am attaching the repair procedure I finally came up with
> to truly
> solve the problem with the '89 200tq instrument cluster. It
> solved the problem with that instrument cluster. I suppose that the
> present problem may well benefit from the same treatment.
> Anyway, here it is:
> Speedo Repair
> '89 200TQ
> Fluctuating or pulsating needle.
> (Also, on the GIGO principle, inoperative cruise control.)
> Note: This information is provided for totally electronic
> not those driven by cable.
> Cause of the problem: A poor connection between the speedo head
> itself and
> the PC board of the Instrument Cluster (IC).
> Repair procedure:
> Remove the IC from the car. (Additional info on IC R/R is available
> this is not sufficient for you.)
> Open the hinged back of the IC and remove it. Several Hex head
> screws are
> involved here.
> Remove the PC board. There are several more screws and a few small
> and pieces involved. No big deal but keep track of where everything
> from so you can put it back later. Note that there are four pins
> from the speedo head through the PC board which provide electrical
> connection between the head and board. (These are very similar to
> jumper connections on many PC boards.) It is these connections
> which are
> the problem.
> Remove the speedo head itself from the IC. Follow the four pins
> back to
> their connections with the small PC board of the speedo head itself.
> Desolder these four pins and then replace them with separately color
> wires which are part of a high quality four (or more?) pin
> Several types are available. I used connectors from an RJ-11 phone
> extension cable simply because I had one immediately available.
> connectors will work nicely - perhaps better. The RJ-11s are rather
> Extend the cable out so that it may be plugged into its mating half
> the IC after it is reassembled.
> Solder the other half of the connector (matching the color coding of
> you did inside the speedo head) to the PC traces where they connect
> to the
> original connectors of the PC board. Lead the cable to the outside
> of the
> IC again.
> Note that some slight amount of cutting of the plastic IC case may
> needed to permit easy extension of the connectors to the outside of
> the IC.
> Select your route carefully and this will be a minimum amount of
> and will be a trivial job.
> Reassemble the IC and plug the two halves of the connector together.
> the dangling connector to the back of the IC to provide strain
> Use of suitable and much smaller connectors will eliminate the
> necessity of
> doing the final connection outside the IC. I simply used what I had
> hand. It might pay to find a better alternative. The requirement
> is for
> four conductors, preferably color coded, and a high quality
> Reinstall the IC back into the car. "
> hth, chris miller, windham nh, c1j1miller at aol.com
> 200q20v mailing list
> 200q20v at audifans.com
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