Comments on: Fixing A Defect Dual Motor Bedspring Unit

By: kriek

kriek — Mon, 18 Aug 2025 05:27:06 +0000

Im now troubleshooting such a device for my mother 86 yrs, seems like the trafo is fried 🙁

Planning to use Your research to mount try to mount an external 24V power supply, great job thanks!

If You have suggestions on such a power supply plz advice Im not sure on how many Watts is needed if both motors run simultaneous,

markings on the trafo says
SEC 19V/50VA
which is only 50W

br, /kriek

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By: Albert van Bemmelen

Albert van Bemmelen — Sat, 26 Aug 2023 11:53:23 +0000

Update: after further opening the unit and after removing both DC motors they were German made type OKIN 24V - 011 VP 24V 10-04/C.
And in the drawing with the micro-switches to the blue wire of both left and right motor, only the top switches (parallel to D5 and D7) were break contacts. The bottom switches (parallel to D6 and D8) each were make micro-switch contacts.
No components were defect and even the short circuit on the right motor was now gone! So it appears that the shorting right motor was only temporary. Because now both motors perfectly worked when tested on my regulated power supply set at 24V upto the 28V as they also worked at in the circuit. Drawing only 0.183A (4.3W) at 24V and 0.189A (5.3W) at 28.14V DC. No doubt that only the previous short circuiting right motor had caused the burning away of the copper tracks of the remote controller board because nothing else is defect and the previous 10 Ohm was only measured on the blue and black wires of that motor!

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By: Albert van Bemmelen

Albert van Bemmelen — Mon, 21 Aug 2023 16:44:49 +0000

In reply to Albert van Bemmelen.

luckily I found and solved the problem today. With my TL866II I flashed the new optiboot Arduino 328p bootfile from ARDUINO IDE over into the bad not communicating only flashing L led and lit PWR led NANO 3.0 defect looking boards. That were not communicating over USB and neither on ISP!
BUT WHILE AND DURING THE PROGRAMMING the button on the NANO 3.0 module must be pressed in all the time! Else the Nano 3.0 boards are completely dead and are wrong read as being some strange $FFFFFFFF processor! Now the modules are working and correctly read as Vid: 0x1A86 processor and Pid:0x7523 boards! And can without any problem be used in any ARDUINO IDE program.

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By: Albert van Bemmelen

Albert van Bemmelen — Sun, 20 Aug 2023 17:47:12 +0000

Yes true. Recently I received 4 cheap brandnew China made Arduino Nano v3.0 modules with ATmega328p processor and incompatible CH340G usb to ttl chips on them. But none worked in Arduino IDE. Not over USB, and neither on the ISP connection!
Did cost me a whole day with many wasted hours of trying to program them with my Pololu programmer, my TinyUSB programmer, and even my TL866II and I gave up for now! Apparently it is a known fact of these clone modules with bad CH340G interfaces. Cheap always has its price!

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By: Yogesh Panchal

Yogesh Panchal — Sat, 19 Aug 2023 16:09:41 +0000

Albert,
Things are common now, after giving time & efforts you come to know parts not available or not worth to buy....

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By: Albert van Bemmelen

Albert van Bemmelen — Sat, 19 Aug 2023 06:22:23 +0000

My brother bought a complete new unit because the price of a new motor unit was almost as high as a new replacement motor. And he didn't want to wait 1,5 month on a new motor either. And only a new motor unit comes with a new 2 year warranty time. He now at least has a good spare motor.
The new motor unit came with a single 9V block battery extra. Apparently for unlocking the motor movement to be able to lower the bed unit even when there is no 230V AC power. Which the old unit didn't have.
And I ordered 4 new changeover DB2 pushbutton switches for about 8 euro so my brother also has a spare 5 pin DIN remote controller. But I am still waiting on the seller to ship those that apparently are German brand and now maybe first have to be send to China after they can be shipped to my country?

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By: Waleed Rishmawi

Waleed Rishmawi — Sat, 19 Aug 2023 04:33:54 +0000

Wow, impressive detailed repair. I hope you will find the right parts with the right price to finish the repair. Have a blessed day and thanks for sharing

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By: Parasuraman S

Parasuraman S — Sat, 19 Aug 2023 01:17:52 +0000

Vow! Excellent article! I am hearing about this device for the first time! What an effort taken to compile this article with excellent manually drawn circuit diagrams! There cannot be any match for you, dear! Excellent explanation too! Very informative! Many, many thanks for sharing!

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