On Fri, 28 Sep 2012 13:37:48 -0700 (PDT),
wrote:

hi folks,
my treadmill has been in storage for a few months, i took it out for use & found it stops about a second after the motor starts turning (with no load on belt)
the problem is intermittant in that by persisting with the start & stop buttons eventually i can get the motor to run as it should & go for a run on it.once the treadmill is warmed up, however the problem does not reoccur.

Does the problem occur when cold if you are not on the belt? IIUC the
person is a pretty big load. (especially the fatties who need to
exercise.) Oh, you say with no load.

If it runs with no load, a back up plan is to let it run unitl it's
warm and then use it.

i googled a bit & found a test to verify motor ok by connecting motor direct to a multimeter & reading off DC voltage at 3mph. i got 60v, which is well above the minimum generally acceptable 28v. i checked that the speed sensor is clean(even though it doesnt look like an optical one).

The controller board has a big cap on it & a relay. any ideas what to try next?
thanks
L
You should be making a drawing of the board, or a list of test points,
Then you should be testing the voltage at all those points whne it is
running and when it is stalled. I gather the thing turns off a
second after it sttalls. So you may be only able to measure one
thing a day, or every few hours. Stil, each test will take less
than a minute.

Plus what the others siad. The most common problems with electrical
things are physical, not electronic.