Any Electronics Experts here ?

AndrewA123

AndrewA123

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Hi,

I recently bought a cross trainer from Ebay, and upon getting it home tried to use it, display came on fine then went "blocky" and went off.

Upon further investigation I discovered that I had been given the wrong Power adaptor, the one provided gives out 12V as opposed to 6V expected by the unit. (this has been rectified by the seller to the satisfaction of both parties)

I've taken the unit apart and checked the circuit, the only visible damage is to one of the Voltage Regulators, as you'd expect. To my amazement this is a VERY simple looking circuit, with large open plan board with few physical components in place.

so, I've removed this from the board and tried to buy a new one. but they don't exist. I've tried RS Components, Maplins etc and nowhere has them listed on their systems.

A Google search identifies the the code as a component, but no info to help me locate another.

So, does anyone know where I might get a new R133AL Voltage Regulator? I assume that this is now a discontinued part and the new part has a new code, however I've not been able to identify this yet.

The cross trainer is approx 2 years old and is a Reebok Fusion, A New console for this would be £62 so I'm hoping to be able to resurrect this one before spending any more.

Any help on where to find one or any equivalent components would be greatly appreciated.
 
david1701 said:
sellers problem?
Click to expand...

Not really, I only paid £10 (that's what a Typo in the listing does for the final fee :lol:) so chose to keep it in the hope I could get it working.

A refund was offered, but for £10 I'd rather keep the Cross Trainer, it still works, just the electronic resistance etc does not, hence why I'd like to fix it if I can. This same model usually goes on Ebay for £75+
 
that may be the one, my concern when I found that page was the preceding U on the component name and the missing L on the end.

I still have the same issue trying to track down a supplier unfortunately, but thanks for taking the time to look and respond :thumbs:
 
From what I can gather from google it looks like its a output of 3.3v. Im by no means a electronic engineer, from the information available on the internet and and some of the details stated above, I would say this component from RS should do the job.

LDO Regulator 70mA 3.3V SOT223

The component is quite small and in the specifications states it is a surface mount component, so may require good eyesight to makesure the solder joints are nicely formed and possibly alot of flux required when soldering.

I do recommend you give the board to someone with experience in this field to do some fault finding, it might not have been the only compoent damaged in the process.

Good luck.
 
Hi, you dont mention what package the current voltage reg comes in or how much space there is around it, but assuming you can fit this in the space then i think it should do. It's got a much greater range of input voltages and the 1A rating means it shouldn't over heat.

I wouldnt be sure about the one suggested above working, as although the circuit will probably not pull the 300mA rating of the orginal component, it may well pull a current close to the maximum 70mA.

You'd also need to check the surrounding circuit and possibly modify it with the new resistive divider circuit required for the LM317 which i linked to, this is detailed in the datasheet, though again you will need space.

As six6six correctly points out, there could be more damage than just the needing a new regulator.
 
thanks for the suggestions guy's I'll check them out over the weekend. I hadn't thought of a TV repair company so may give that a go too. cheers.
 
If you can get a photo of the damaged component I should be able to tell you which one you can use from maplins

(28 years of electronics design :))
 
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