Faulty treadmill control board

[sgtlard]

Treadmill developed E1fault mid run.

After googling and testing :
Motor is ok - using a battery as per google
Bushes ok - 2.5cm remaining
All cleaned

All features work except when starting the treadmill. Makes a partial turn and stops. Counts 6s and shows E1

red led comes on, stays on.

move safety off/on - same outcomes

assuming it’s the control board - can’t see any obvious damage

any ideas where to start?

 

[sgtlard]

Better board photo

 

[Bluejets]

Has that chip (U3) in photo 1 got a lump out of it..?

 

[sgtlard]

Hi. I thought so but on closer inspection, it’s a thin line of the ‘glue’ that seems to be deposited all over the board supporting components.

 

[sgtlard]

The operational issue has the feeling of Something attempting to start and blowing a fuse instantly so failing. Putting it under any load, fails.

the fuse hasn’t blown.
I tried taking the tension of the running belt as a precursor to replace/lubricate but it’s not even trying to move anything.

Motor runs fine on the drill battery

 

[Alec_t]

Are any electrolytic capacitors bulging/leaking?

 

[sgtlard]

Nothing I can see. All look intact.

 

[sgtlard]

Nothing I can see. All look intact.

 

[pharaon]

that caused of overload on the motor due to heavy running belt, i suggest you to lubricate the belt very well" between the belt and the underneath piece of wood " before assuming the fault in the circuit

 

[sgtlard]

I’ll give that a try.

 

[sgtlard]

Ok

waiting on lubricant - so removed the belt and tried without any load ( except front roller )

same result. Turns further but stops in seconds ( feels the same duration as before ) and E1 at 6s
Power off/on and repeat - same result.

the red led comes on each time - power off/on resolves it until test

 

[sgtlard]

It’s like the starting of the motor pulls too much current, tripping out the control board and stopping

I have to switch off power and back on to try again each time

what would trip out on the drain and reset - is that the mofset ?

 

[pharaon]

ok the M+ and M- for the motor try to measure the output voltage with DMM and see if it's constant or it disconnect after while

 

[WHONOES]

See if you can measure the current demand for the motor as well.

Edit: Do you have any documentation that describes what the fault code means.

 

[sgtlard]

I’ll have to pop out and get a multiM

 

[sgtlard]

Documentation says it’s a speed sensor issue. But the motor cuts out before any speed - so no speed to measure

it’s an endex dcmd57 board

 

[sgtlard]

Ok

not sure I’m doing this right. Dmm set time dc 200v. No reading Without motor connected. Pressing start - I hear a click noise from the board and a red led get lit up

with motor, reading jumps to about 20v, and falls back to zero


Tried to read the pull ( change dmm mode to amp, move the connector and set to amp ) no reading.

 

[pharaon]

Tried to read the pull ( change dmm mode to amp, move the connector and set to amp ) no reading.

To measure amp the dmm need to connected in series

 

[sgtlard]

Hi

It was connected between the neg out onthe motor and the neg pin on the board.

 

[WHONOES]

Can you disconnect the motor and measure the resistance on its terminals. It is likely to be quite low so, you should proceed by turning on the DMM. Switch it to the lowest resistance range available. Connect the DMM leads together making sure you have very good contact. Make a note of the reading calling it "A".
Now disconnect meter leads from each other and connect them to the motor. Wait a few seconds for the DMM reading to settle. Make a note of the reading, calling it "B".
Now subtract reading "A" from reading "B" to give you the true value of motor resistance.
Of course, it might be quite high rather than low.