⟐ Edited by author August 27, 2026 at 7:03 MST

Bench measurements and trace analysis:

- Pin 2: GND (Vcc-)

- Pin 5: 10V Vcc+

- Pins 1 & 3: AC line phase monitoring (zero-crossing/heartbeat inputs)

- Pin 4: Output running through a 10k resistor to the anode of a PC817 optocoupler (cathode to GND), sending the power-available heartbeat signal across to the secondary-side processor board.

Because Pin 4 drives an optocoupler LED via a 10k resistor rather than a standard logic trace, an open-collector/open-drain output configuration is actually required (sinking current through the optocoupler). We are looking for an exact cross-reference or identification for the '21ASP' SOT-23-5 IC matching this open-collector comparator or logic function.

Since replacement power boards are unavailable, does anyone know the exact cross-reference or functional equivalent for this IC?

⟐ Answered August 27, 2026 at 5:04 MST

⟐ Commented August 26, 2026 at 0:33 MST

⟐ Commented August 24, 2026 at 18:09 MST

Edited to add: I checked the voltage on the docking station and it is getting voltage. The feet on the docking station are springy so they are not stuck. Everything has been cleaned with rubbing alcohol.

Edited again 8-24-2026:

Changed the battery out, but the behavior persists. Suspect it is probably the charging board. Firmware update requires installing an app that wants far too much information for the purpose it fills. No way am I going to turn loose a robot from Shenzhen, China on my WiFi network that is all ready having issues with a ton of personal info. I don't see any other external ports to plug the robot in via usb either. Will put this in the junk pile. Maybe some other parts will find their way here someday and I can cannibalize those pieces into one working machine.

⟐ Edited by author August 24, 2026 at 17:39 MST

When attempting to register, it says device needs factory reset. After performing factory reset, it says it failed and to try again. I also do not hear any tones or sound. Any recommendations? I've tried numerous solutions but nothing seems to work.

⟐ Commented August 23, 2026 at 15:52 MST

⟐ Commented August 23, 2026 at 15:43 MST

⟐ Commented August 21, 2026 at 22:43 MST

I switched off both the loader and the robot. Then I switched on both the loader and the robot and got an undefined signal: upper lights on, middle and under lihgts flash.

So what can I do?

We press the trigger button and the the hoover works for a few seconds and then stops. It does this consistently

⟐ Commented August 19, 2026 at 21:08 MST

R1138 model

⟐ Commented August 18, 2026 at 2:31 MST

First let me say, the battery charges just fine and I’ve totally cleaned out the collection bin. I push the button to turn on the vacuum and it works, but then turns off and on over and over again while I’m still holding the button down.

I looked this up online and someone said the filter needed to be cleaned. So I took out the filter rinsed it as the online instructions said, let it dry, then put it back in. This did not solve the problem.

Any other suggestions?

⟐ Commented August 13, 2026 at 20:31 MST

⟐ Answered August 13, 2026 at 11:01 MST

⟐ Commented August 13, 2026 at 8:10 MST