소개
This guide is about how to fix the jerking bump.
No parts need to be replaced.
필요한 것
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Fold backrest forward by pressing the release tab in and under the chair (Arrowed) and push the backrest forward.
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On the two last pictures you can see the release lock and tap after the backrest is folded forward
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Remove the screw for the cord inlet (Marked as 1) and remove the cord cover
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Remove the 5 screws (marked 2) for the back cover - Please note they are NOT all the same size, so pay attention to the positions
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With the cord cover (#1 in previous step) removed, remove the two connectors
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The connectors on my model was protected with plastic strips to prevent me from releasing the lock tap - didn't work - I took the picture AFTER I had removed the cover so it was easier to see what the connectors looked like
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Remove the strips or pull them towards the wires (Upwards) and use a flathead screwdriver to prise the lock open and remove the connector
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Remove the back cover
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In my case I looked at the mechanism and saw no immediate failures
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I then noticed that a black strap (Arrowed) was showing signs of being curled/crumbled
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Further examination shows that the strap, which goes from top to bottom, was not aligned 100 % centered between the massage wheels (I try to show that with the red line) and the strap had become a little loose
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The result was the that the right wheel was sort of "picking up" the strap, so both wheels was on the same side of the strap
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At some point the right massage wheel had to cross back again over the strap hereby crumbling it and giving this jerky bump.
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The fix is to tighten the strap - there are two ways
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1 - Remove the frame with wheels and rollers and re-align + tighten the strap
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2 - Tighten and partly re-align the strap
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I opted for solution 2
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I tightened the strap at the botton of the frame, because this is where I had space to manouvre
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I positioned the strap more to the left so it got centered
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I used a 1.5 mm drill to prepare a whole in the frame so the plate screw (See picture 2) does not rapture the woodden frame
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I used a plate screw to secure the strap in the new position
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To reassemble your device, re-connect the cable connectors
Then place the back cover again, making sure it fits without pinching something
Finally place the cable/cord cover
To reassemble your device, re-connect the cable connectors
Then place the back cover again, making sure it fits without pinching something
Finally place the cable/cord cover
