Buggered Mach1 Sensor :-( Help plz.

[Fatherspoon]

Hi, my Prommie Mach1 sensors been messed up for a while, so i can have a windows temp of -30°C but the LCD on the prommie reads 70°C and it keeps dropping and rising tripping off that loud anoying alarm :mad: :mad: :mad:

Anyway to disable the alarm? :)

Thanks.

[Maxprime]

There IS a way to disable the alarm - look up old posts about people modding their Mach I's - they know how to disarm it (I don't).

[Fatherspoon]

I have been looking up thru the old posts, but from what i have read they are getting cold below -50 temps, thus they put a resistor in to set the tep 5C above. I want the alarm off completely, even the lcd if need be.

Anyway todo that?
Thanks.

[Marci]

Can't be turned off completely. All u can do is open the controller and desolder the alarm beeper.

[Fatherspoon]

Ah ok, thanks alot. Guess thats what im going to have todo then :D

Thanks again.:toast:

[CodeRed]

Originally posted by Fatherspoon
I have been looking up thru the old posts, but from what i have read they are getting cold below -50 temps, thus they put a resistor in to set the tep 5C above. I want the alarm off completely, even the lcd if need be.

Anyway todo that?
Thanks.

remove the sensor wires from the controller and put a 100kohm resistor in it place (across terminals 7 & 8).

the controller will be tricked into thinking it has woking temp sensor connected. not sure what 100kohm equates too .. prob around -10 deg C.

BTW: check the wiring first, sounds like a broken wire somewhere. the connections to the controller are a bit dodgy at best.

[bowman1964]

you can replace the sensor,and run a new wire to the controller.
i have the ohms and thermistor part number at home needed to get it working again.

[Fatherspoon]

Originally posted by CodeRed
remove the sensor wires from the controller and put a 100kohm resistor in it place (across terminals 7 & 8).

the controller will be tricked into thinking it has woking temp sensor connected. not sure what 100kohm equates too .. prob around -10 deg C.

BTW: check the wiring first, sounds like a broken wire somewhere. the connections to the controller are a bit dodgy at best.

Thanks alot, sounds better than unsoldering the alarm. I'll check the wire to the controller right now just incase.




you can replace the sensor,and run a new wire to the controller.

Thanks bowman, sounds like a plan. So...how would i go about this? Opening up the block, removing the neoprene and installing this new thermistor? Please can i have some more info on this, Thanks. Preferably in the thread, then others can see what they might have todo aswell :)

Xtremesoforums rock :D

[bowman1964]

na you should be able to add one to the outside in the corner.it should fit if done right,then run a new wire.

[Fatherspoon]

ohhhh, thanks a bunch!!! Sounds class :D

Can i have the part numbers needed? Thanks for all the help. No wonder u got a good name around here :cool:

[bowman1964]

well radio shack sell a 10k ohn thermistor(that is what i used last time.part #271-110a
i am looking for my notes on the resistor i used to cross over the wire ,to give you the right readout.but i havent found them yet ,i am cleaning up maybe i will find them soon i hope.

[bowman1964]

ok looks like i used a 220 ohm and a 560 ohm combined and crossed the sensor wires.

[Fatherspoon]

Originally posted by bowman1964
ok looks like i used a 220 ohm and a 560 ohm combined and crossed the sensor wires.

ah ok, thanks alot. Ill order a couple of them tonight along with some gfx/mobo vmods. Not sure what you meant by cross over sensors wires?