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Hansoon
08-10-2011, 09:00 PM
Workaround for failing fans..., ...here fan M17 of Minolta Di-450

Since I believe that basically these fans are working but only the speed sensing circuit is not functioning well, here's a workaround when you are in a hurry and need to get the machine up quickly again or also as a semi-permanent solution.

I tapped the speed sensor signal coming from the Power Unit fan (Yellow wire) and connected it to the PJ13-UpperLayer-Pin1 on the PWB-A instead of the original Grey wire coming from the speed sensor of fan M17

Here are the pictures from the experimental setup showing a wire coming from PJ13-UpperLayer-Pin1 going to the pin of the yellow wire from the connector of the power unit fan. I think any fan in the machine can be used but his one was easiest to reach.

http://img42.imageshack.us/img42/153/m17mod.jpg[/URL]

I'm sure in the field you will route the wire more professional as I did here......and yes, normally harddrives should not be mounted this way but its my experimental machine as I mentioned before........

Hans

habik
09-20-2011, 09:57 AM
Wow I'll try and give it a go. Did you had some sort of oscillation and the speed was affected and gave you fan error code?

Do you reckon a ferrite core on each end of harness could possibly solve the solution too?

Hansoon
09-20-2011, 11:03 AM
This is an old ailment. Fanspeed seems to be much OK but the speed sensing circuit itself is likely faulty. I'm using this method since very long on our Minolta's and recently also on the KonicaMinolta Bizhubs. You just have to figure out yourself in the wiring diagram which wires are concerned. Until now, with our fans, it was always the yellow one.

Good luck.

Hans

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