SDG

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SolderKing UK Made Solder: solderking.com/
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Altium Designer Free Trial: www.altium.com/yt/sdgelectronics
SolderKing UK Made solder available at Kaisertech:
UK JBC Distributor kaisertech.co.uk/ Discount Code: "SDG5"
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0:00 Introduction
02:00 Disassembly
08:45 Frontier Radio SoC
10:53 PCBWay - Promotions and Community Page
11:46 Audio electronics
14:07 Fault analysis
17:33 Repair
22:23 Conclusions
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3D Printers:
Geeetech Mizar S on AliExpress: bit.ly/3MN0c0M
Artillery Genius at Banggood: bit.ly/32iG2dv
Geeetech Mizar S on AliExpress: bit.ly/3MN0c0M
Geeetech A20M at Banggood: bit.ly/2YooVll
Geeetech A20M at AliExpress: bit.ly/3oBqo2I
Geeetech PLA+ Filament: amzn.to/3gelSX1
Ender 3 V2 at Banggood: bit.ly/36lN8Ny
Ender 3 V2 at AliExpress: bit.ly/3j1C2CO
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Soldering Tools and Equipment:
Aixun T3B on Aliexpress: bit.ly/3CHerj1
Aixun T3B on Aliexpress: bit.ly/3cDkWIY
Aixun T3A on Aliexpress: bit.ly/30LDcgG
AiXun T3A on Aliexpress: bit.ly/2VdRVhU
Yihua 853A Preheater: www.banggood.com/custlink/DGD...
Youyue 946C Hotplate at Banggood: bit.ly/2MuLwqM
Youyue 946C on AliExpress: bit.ly/374v3Tp
Solder Paste: bit.ly/2E1P5jR
Solder Flux: bit.ly/2MQn7we
Quick 857DW+ Hot Air Station: bit.ly/2OWDvf4
T12 Soldering Station: www.banggood.com/custlink/3KK...
AC Version: www.banggood.com/custlink/3GK...
T12 Iron Tips: www.banggood.com/custlink/3DG...
Daniu Tip Cleaner: bit.ly/31VHwWM
KSGER T12-BCM3 Tip: bit.ly/2xgYXCQ
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Test Equipment:
Mustool MDS8207 Multimeter: bit.ly/2kKHr7A
FY6900 Generator: bit.ly/2yZI40n
Differential Probe: bit.ly/31xNTOF
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Microscope Equipment:
Eakins Barlow Lenses: bit.ly/3aBY5tR
Eakins Black Microscope: bit.ly/2VEcYaW
Eakins Camera Microscope: bit.ly/2x86hnT
Camera Adaptor for Microscopes: bit.ly/2KBZQMQ
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Amscope Trinocular Microscope (US): amzn.to/2YdBE8k
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Swift SS41-WF20 Binocular Microscope US: amzn.to/2VLWEpb
Swift SS41-WF20 Binocular Microscope UK: amzn.to/2GYGYFV
Visit my website: www.sdgelectronics.co.uk/
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#ElectronicsCreators

[@sdgelectronics]

PCBWay 8 Year Anniversary Promotion: www.pcbway.com/activity/anniversary8sales.html Support the Channel with Patreon: www.patreon.com/sdgelectronics

[@louiselyon3849]

Wow, in awe of how you do open heart surgery on these radios… and all the conversation replies, it’s like a new language to me! Hoped to see why my almost identical radio (hardly used) won’t switch on at all. Was parked in the guest room, on battery power but not mains. After a while saw the red dot sb light had gone dim. Changed the batteries, also plugged in, but dead as a dodo. Anyone think it’s fixable? Thanks

[@andymouse]

This is 'Right to Repair' in a nutshell, all we ask is that companies make the parts available at reasonable prices and we'll do it ourselves, great work and interesting video....cheers.

[@TheEmbeddedHobbyist]

Squeak and the parts shall arrive. :-)

[@andymouse]

@@TheEmbeddedHobbyist I wish ! ...cheers.

[@gregclare]

Nice save of what appears to be a quite nice radio. Kudos to Roberts for their remarkably reasonable spare parts supply. It’s companies like these that we should all be supporting and spreading the good word of mouth.

[@Lyndalewinder]

Really impressed by Roberts supplying spares - next time I buy a radio I'm going for one of theirs!

[@brianwood5220]

Sounds like Roberts Radio support "Right To Repair". Great video Steve, thanks for sharing.

[@FrankEdavidson]

They should make an all season outdoor use wireless for use in the garden, allotment, building site, sentry post including when it's raining.

[@NZHippie]

Good on Roberts for taking a sensible approach to what is essentially a brand new product that would have under normal circumstances ended up in a land fill...

[@lo377ps]

Nice video. Impressing that they send out spare parts on component level.

[@thomasw6169]

Extremely positive step from manufacturer to help repair.

[@londonbluevideo]

Really enjoyed watching your repair video, thank you for taking the time to explain what some of the semiconductors do as well.

[@sprsnrprs]

Easy repair but really nice explanation and analysis of how the radio is built. i enjoyed it 👍

[@IanScottJohnston]

Nice looking retro style radio......and seems pretty good quality construction considering. Nice repair.

[@PCBWay]

Hey Ian, Caught you here. Greeting ☀

[@SimonB6706]

Full marks to Roberts 🏆🥇

[@PCBWay]

Nice sharing, Steve 👍

[@TheEmbeddedHobbyist]

well done, my £200 Roberts is stuck with the orginal DAB and could not be upgraded to DAB+. Still works with some stations but not all. I suppose that’s the problem when you buy in to a new service with early hardware, they don’t know where it will go in the future. Plus it most likely more hardware than soft

[@sdgelectronics]

I was unaware that there were incompatibilities with original DAB equipment. Pretty rubbish if that's the case!

[@Monkeh616]

​@@sdgelectronics It's much the same as the move from DVB-T (Freeview) to DVB-T2 (Freeview HD). Stronger error correction, a codec invented some time after the 1980s (from MPEG-1/2 layer 2 to HE-AAC), and so on. Time marches on - we've had DAB+ capable hardware on the market for at least ten years after all.

[@jb5631]

If the PCB layout is not too different; maybe you can buy the 'replacement' part that will upgrade yours to DAB+

[@TheEmbeddedHobbyist]

@@jb5631 I expect the chipset will drive the PCB layout so it might be quite different. but i'll have a look in side just in case. thanks for the idea.

[@robbieaussievic]

.... Excellent, Well done Mate, ('PURE' DAB+ run and hide if you mention spare parts).

[@qviewq2071]

I used to repair Roberts radios for the Wireless for the Blind Fund. I learnt to hate them as they always had something wrong with the sound. A sort of hidden distortion that gave me a headache when listening to them for more than a few minutes. I am sure now they are a modern design that they will have fixed that problem. Are they still making them in the UK? The only manufacturer left I would guess. They used to be in south west London I thought but this set is labelled as Yorkshire. I like the vintage styling and hope it sounds better now..

[@fishing9308]

thanks for the good video how strong is your soldering tip???

[@raul0ca]

It looked like a very thick Metcal tip for thru hole soldering. It's solid and should withstand the bending of the thin prong

[@proudsnowtiger]

Nice repair. If I was spending that much on a radio, though, I wouldn't expect a mechanical encoder. Roberts so often does stuff that's almost very good, but some corner is cut somewhere.

[@valdirdeaguiarlima7241]

Have you tried to remove the handles, it's fasteners from the case? Could it be a way to open it?

[@PapasDino]

Nice fix...but even though the encoder terminal solder connections appeared good did you simply reflow them to see if that resolved the issue? I'm sure it probably would not have but that would have been an even easier fix if that was in fact the issue.

[@reveal1693]

I prefer repair videos! Thank you

[@kendom33]

Great video with a very professional approach to fault finding. I've a couple of RD 60 chassis which need repaired (beyond my skill level ) would you know of anyone?

[@hardeejr]

Hi there! I'm working on repairing an iStream3 where the power button doesn't work (same rotary encoder as you're working with, I'm pretty sure.) Volume works OK, though. I am located in the USA, so ordering the replacement encoder from Roberts will cost a pretty penny in shipping. Were you able to find a compatible part at all that is available from Mouser (or another supplier)?

[@wayneaylmer572]

Could you please tell me which wire it is inside a Roberts RecordR is the one that represents the scan mute? Obviously on FM mode when you scan it mutes the white noise sound between stations while it's scanning, I need to know which wire or component it is that does this on the circuit board. If you could help that would be fantastic

[@twobob]

Good fix

[@Mrdibzahab]

Those encoders frequently fail, is my experience, usually by sending seemingly random pulses. Turning slowly clockwise then sometimes becomes turning anti-clockwise at high speed (or the other way around). Depending on the application, this can make you deaf or it can zap your prototype :(. I never found a clear cause either when examining them.

[@jaro6985]

The high speed is due to contact bounce. Encoder feel is highly dependent on the software routine that is processing it, if it was poorly done, as the encoder ages and gets dirty, response will get worse. Probably not the case here as there was no response.

[@ToomsDotDk]

can you show more of that desolder gun vs other ones

[@MrGepper]

Yes i would also like to know the brand / model.

[@IanScottJohnston]

That 4.7k resistor value seems odd.......99.9% of the time it's 2 pairs of resistors and a couple of filter caps. Cant see why the A channel would be any different to the B channel.

[@sdgelectronics]

My guess is shared function for the Verona 2 module, possibly JTAG or some other interface

[@HwAoRrDk]

Huh, didn't know Roberts sold spare parts. Would have been useful when I wanted to repair an old radio a while back. The small custom-sized mains transformer had failed open-circuit. Instead I bodged in a DC barrel jack and run it off an old phone charger.

[@sdgelectronics]

Neither did I, I just asked on the off chance if they had a part number for the encoder so I could find an exact replacement.

[@brianmiller6320]

Nice positive click encoder, could be useful in arduino projects or other encoder repairs.

[@BM-jy6cb]

Pah! That's not a repair. You cheated by just ordering a new encoder instead of repairing it 🙂. Seriously though, nice job. It's very gratifying getting a bargain and saving a perfectly good item from landfill because of the throwaway society we live in. One of the perks of knowledge. I've fixed a few of these problems on bargain basement items just by disassembling the encoder and tweaking the fingers up a tad.