circuit board testing ?

Don't know if anyone can help

I've got a circuit board from a tread mill that appears to be faulty, is it possible to test just the board without the rest of the tread mill as it's so heavy to take anywhere.

Have tried asking at a couple of local electrical shops but can't seem to get a straight answer (don't think they know).



Would appriciate any advise

 

I was told it had the problem from new so maybe an assembly fault.

When treadmill is turned on the console counts down, at the point the belt should turn it trips. I've tried disconecting the motor but the problem still occurs.

If the motor is turned manualy by walking on the belt, it counts down and only trips when you stop.

I've done the obvious checks, all connections/joints and wires seem ok, although there appears to be an item missing from the board, marked as TVS1 or maybe TUS1. Don't know if it should be there or not.

Will post some pics seperate as I keep losing text when trying.

 

Couple of pics, not very clear now uploaded,

Will get some better ones but you can see where the part appears to be missing.
It has ac going to the board and motor is dc, also some form of speed controller.

If all else fails do you think it would be worth changing some of the components, I don't know alot about electronics although I can solder this type of board, but would need help to id what does what.

Have tried to google some of the numbers but with no luck.

 

The three components in top of pic do go to a heatsink and are numbered

Small one S6025L middle one G80N60 UFD G11 large one B2 MUR3060PT and the motor does connect to the terminals just below them.

Has it's own trip switch ( as in pic ), the motor makes no attempt to move at all and I'm a bit reluctant to put my meter across it incase that blows before the trip. Do you think it would ?.

Is the small white ic the square thing with six pins ? 0604 TLP561G

Much appriciated

pics to follow

 

Thanks KJ6EAD, I'll have a read .

Thats what trips but not straight away, just when the motor should start.

Should have said earlier that it also has incline, which is driven by another motor, this works fine until you try to start the running mode then it trips.

Which part of the board controls the speed ?, it has a magnet type sensor on the wheel that drives the belt.

 

Cheers Steve

I've got a multimeter and have done basic checks on power in and wires, I'll try and see if I'm getting any output to the motor.
Is there an easy way of testing the CB, I suppose if I bypass it and rely on the consumer unit it could cause more damage.

 

I posted before I'd seen that one

I'm very greatfull for the help

 

As you look at the pic

Left one - Resistance between 1&3 only

Middle one - No resistance on any

Right one - resistance between 1&3 only