Broken treadmill isefit SY-1001

[Pamks]

I have a problem with the SY-1001 treadmill. One day, while working at the computer, I heard a relay click in the treadmill every few seconds. I went to see what was happening, but the screen was blank, so I decided to unplug the treadmills from the mains. After reconnecting, nothing strange happened with the relay. The next day, during training, after about 8 minutes, the relay was turned off, which resulted in the treadmill stopping suddenly, and the E09 error appeared on the screen. I decided to let it rest because I thought that treadmill might be overheating and some protective mechanism was triggered. After an hour I started the treadmill again and after 8 minutes it suddenly stopped showing the same error E09. After restarting, the motor power relay does not turn on and immediately after starting, the E09 error appears on the screen and the treadmill cannot be started even for a second.



I disassembled the treadmill and it turned out that the driver is the PSA10H-0100, for which I can not find a diagram or manual. I checked the voltages and it turned out that the control board is powered by 12V DC, and the switching system is powered by 15V DC. After starting, there is no voltage controlling the relay, so I exclude its damage.



The power supply is controlled by the DK-112 chip and it is powered according to the datascheet.



Sometimes when I start the treadmill, the supply voltage starts to flow and instead of 12V it can drop to 8V. It is possible that the problem is with the DK-112 system that incorrectly controls the transformer, which causes the supply voltage to drop? The strange thing is that the E09 error shows up regardless of whether the voltage is correct or lowered.



I checked the capacitors and they are not short-circuited and their capacity is correct. All optocouplers have valid values. Do you have any idea what else is worth checking?

I have not found any information about what the error E09 may mean. Maybe some feedback is missing? But from where...

[thm_w]

Did you check the ESR of the two small electrolytic capacitors?
Is there any ripple on them when the supply is only outputting 8V?

I might try to feed in 12V DC and see how it behaves.

The QC sticker is from 2021, does this not still have a warranty?

[CapLeaker]

Since this thing is foldable, I would think there is a switch of some sort to prevent the treadmill from running, while being folded. At the same time check the speed sensor and clean it. Trace the relay coil voltage on the PCB and see how it is generated. Check the relay itself and make sure it works 100%. Take a pic from the bottom side of the board and post it.

[Mashcar]

I bought same treadmill with same error code, problem was shorted IGBT element. I changed to one with better parameters fga60n65smd exactly and it is working again. Good luck!