How to un-mod a Toyota SR5 tach? V8->4Cyl?
05-04-2006, 10:53 AM
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How to un-mod a Toyota SR5 tach? V8->4Cyl?
Got a SR5 cluster today from eBay, managed to pick it up pretty cheap because it's been modified for use with a V8. I figured the modification would be fairly obvious on the tach's PCB, and I'm seeing one or two things which it might be, but I'm not too sure.
Anybody gone either way with this mod? It looks like, to me, capacitor C333 (probably a polystyrene or polyester film or maybe a ceramic disc or tantalum type cap) has been replaced with a metalized polyester film cap with a larger body.
One thing I noticed right away was that there was a jumper made from automotive harness wire (blue w/white stripe + red dots) going from one side of R56 to IGN. I figured that was the mod so I snipped the wire. Then I took a closer look at the underside of the PCB and it looks like that was just a repair to take care of a torn trace. Oops. Anyway, I'll put that back in place and look elsewhere.
Also, there is noting in position for C1, which, by the silkscreen on the face of the board, appears to be a space for an electrolytic cap, but the solder looks pristine on the underside of the board - it's a nice smooth blob that looks machine applied, where, say, one leg of C333 used to be is a flat solder pad with the hole exposed from the desoldering process.
Anybody gone either way with this mod? It looks like, to me, capacitor C333 (probably a polystyrene or polyester film or maybe a ceramic disc or tantalum type cap) has been replaced with a metalized polyester film cap with a larger body.
One thing I noticed right away was that there was a jumper made from automotive harness wire (blue w/white stripe + red dots) going from one side of R56 to IGN. I figured that was the mod so I snipped the wire. Then I took a closer look at the underside of the PCB and it looks like that was just a repair to take care of a torn trace. Oops. Anyway, I'll put that back in place and look elsewhere.
Also, there is noting in position for C1, which, by the silkscreen on the face of the board, appears to be a space for an electrolytic cap, but the solder looks pristine on the underside of the board - it's a nice smooth blob that looks machine applied, where, say, one leg of C333 used to be is a flat solder pad with the hole exposed from the desoldering process.
Last edited by SporkTek; 05-04-2006 at 11:23 AM.
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