I love a good radio. I used to collect them as a kid, working or not, do them up, get them working and I eventually ended up with, er… lots. I’ve since scaled my collection back a bit these days to around 10 or so, quite frankly more than is healthy really.
So when someone got in touch recently with a broken DAB radio to fix, I got quite excited.
These Bauhn DAB radios (available from Aldi or Lidl in the UK, I think) were on the market for about £10 and at that price they represent great value when compared to more expensive devices.
However, the one in the workshop appeared to have a problem power connector, which when wobbled, made the radio work intermittently. Suspicious.
Having already repaired a similar radio with a similar fault before, I decided to video the repair to encourage others to check theirs, if something similar happens. I hope you find it useful.
Cost of a new radio: £10. Cost of repair: One cuppa and a bit of tinker time.
Who wouldn’t love a new DAB radio for your birthday? Well, that’s what I had this year and I was thrilled to receive this Pure Evoke H2. After choosing a suitable location on my desk, I quickly unpacked it, plugged it in and…nothing. Booooooo!
The display backlight appeared to glow a little, but that was it and I was missing Today on Radio 4.
To save a quite frankly dull story, the returns and replacement process offered by the company who supplied the radio was hopeless. But, after 2 months, I ended up with a replacement radio, in addition to the one I already had. The second radio worked, albeit with some fettling required to the speaker to make it sound ok (another story).
Time to dig out the screw drivers as I had nothing to lose.
Just 6 screws hold the back on and with these removed, the radio’s innards were exposed. Now, I’ve made radios from kits in the past using components I can hold with my fingers, but with this radio, the circuitry was teeny-weeny and I would have to have some luck to fix it.
I was in luck. The radio is made up like a sandwich. The front fascia is screwed to the cabinet and the back, that I’d removed, was screwed to the cabinet, from the other side. There are data-style cables between the two halves and one of them appeared to be loose. I carefully pushed the connector ‘home’ and then re-applied the power lead and wouldn’t you know it, the display lit up and it burst in to life. Now we’re talking.
Thinking I’d sussed it out, I screwed the radio back together and had about a week or two of unbroken service, until the screen froze and then nothing. Oh no.
Re-opening the back of the radio, I suspected that the tiny soldered pins on the back of the multi-way connectors on the data-style cables, had been dislodged. I have average sized hands for a bloke, but I needed tweezers to get the connectors on during assembly. I wonder how much it would have cost to add an inch or so to each cable, to make manufacture easy. As a consumer, I would have gladly paid the extra penny. I suspected that this is how the original fault came to be as it wouldn’t have taken much more than a shove in the wrong direction to break the delicate connectors, due to the short length of the internal cables.
Since this circuit board is a tiny stamped component affair, I had to be quick and neat with my re-soldering. Each pin to PCB connector re-soldered, cables re-attached, back screwed back on and the radio worked once more.
Pure have a reputation for easy to use, excellent sounding products. It’s just a shame they have seemingly penny-pinched on some of the internal gubbins on this model. If yours develops similar symptoms, don’t give up, take the back off and have a look.
Cost of a new radio: £40-90. Cost of repair: 5 mins tinker time, one cup of tea.
On the back of a previous article about a repair I did on the rather wonderful Elna SP sewing machine, a reader got in touch. She was a genuine sewing aficionado and had several top of the range current machines, but she used the trusty Elna SP for many smaller jobs, where the other machines didn’t quite cut it.
All Elna SP machines are getting on a bit and parts are either re-manufactured, scarce or secondhand, if you can find them. Having said all that, a well-maintained Elna will run for many years and last much longer than new metal on sale now.
The foot pedal on this machine had gone pop, bang, finito. It smelled terminal.
Knowing that parts for this machine are rarer than hens teeth and I do like a challenge, I took on the job. I’m based in Worthing, West Sussex and the machine was located in Scotland, so after a short wait, the knackered pedal arrived in the post.
The pedal is held together with four small self-tapping screws and came apart easily. The reason for failure was two-fold. The copper leaf contacts had arced excessively and caused major pitting in the contact strip (see slide show) and the probably ensuing resistance had caused the main resistor to overheat, causing the winding to fail.
The contact surfaces were easy-ish to fix, or rather breathe new life into as all they needed was cleaning and re-shaping. The resistor was a bit trickier to mend. Getting hold of a replacement was going to be near impossible, so the only thing to do was to try and repair it. Without that particular style of resistor, of that value, it wouldn’t work again. Luckily, there was some excess resistance wire on the thing and I managed to twist it in to the broken section. Soldering was not an option, since the wire was an alloy that wouldn’t take to solder and in any case, these things get hot in normal service. I twisted both ends of the break to form a new section, while maintaining the same length of windings on the resistor, essential if I was to match or get close to the original specification. Difficult. Luckily, after a few goes, I managed it and the applied a little heat-conducting (and therefore dissipating) paste to the join.
With the pedal reassembled, I was only able to test it with my meter, since the sewing machine was far too heavy to post. The pedal tested as a closed circuit (OK), which was a result. I then had to wait for the pedal to be collected, taken back to Scotland and tested. Fortunately, my fix worked and the machine sprang in to life, without a hitch or missed stitch.
Now, a word of caution with this one. This is NOT the best way of mending something like this and all I’ve probably done is prolong it’s life a little longer. There are generic sewing machine pedals that would work with this machine and will be fine, when this one fails in future, but that’s not the point. The main thing is that something that was broken is now working and even if it’s not the best fix, at least it will run for a bit longer. Happy days.
Cost of replacement: (generic part) £15-30. Cost of repair, my time, a bit of solder and several cups of tea.
A colleague of mine brought this cool little DAB radio in to the workshop as it’s once crisp DAB tones were now no more and all life from the little device, had seemed to have ceased. It was, very much, a dead radio. When working, it picked up every station available, really clearly and seemed to out-perform the much more expensive devices my colleague also owned. However, after a few months in the hands of his son, the radio would no longer turn on when plugged in.
It was brought from Aldi for under £10, which seemed like a bit of a bargain to me. It’s amazing just how much DAB radios have fallen in price in the last 5 years or so.
The Bauhn UDABR-0197 (catchy name) is a compact, portable radio and is capable of being used with either a plug-in adaptor (supplied) or 4 x ‘AA’ batteries. When powering this radio using either plug-in adaptor or batteries, the little radio refused to do anything. Very sad.
I always start with the basics, so I checked the power from the plug-in adaptor first, which seemed to be delivering its 5.9VDC, pretty much spot-on. As a side note, I always check the condition of plug-in adaptor leads and plugs as they seem to almost always be made of the thinnest wire available in the Far East and prone to cracking causing poor connections. This one was fine.
Opening up the radio was really easy, just 4 cross-head screws and the two halves of the radio came apart without any major dramas.
The first thing you notice about (cheaper) small appliances like this, is the ‘lack’ of anything inside. The circuit boards in new small devices can sometimes be multi layered affairs, using micro components, making repair with normal workshop tools very difficult or impossible.
Luckily for this little radio, the designers have had the foresight to keep the power distribution board separate from the main ‘radio’ gubbins and this seemed to be of conventional construction.
FixItWorkshop, May’18, Aldi Bauhn Radio, in for repair, PCB repaired.
FixItWorkshop, May’18, Aldi Bauhn Radio, in for repair, PCB back in position after soldering.
FixItWorkshop, May’18, Aldi Bauhn Radio, in for repair, broken pins.
On closer inspection of the power distribution board, it revealed a break in two of the pins from the ‘power-in’ jack socket meaning that power would not get through to the main circuit board. The two pins were also shorting together, causing a local loop connection. This meant than neither mains adaptor supply nor battery would power the radio. Problem realised.
I was then able re-make the connection using a soldering iron on the board, reconnecting the pins to a spare section of copper detail on the power distribution printed circuit board. Very satisfying.
Once the radio was back together, all screws back in place, power supply connected, the radio burst in to life, just in time for me to listen to my favourite station. Happy days.
Cost of a new radio; £10. Cost of repair; A bit of soldering and a cuppa plus gingernut biscuit.
This cheap and quite frankly nasty DVD player came in as a dud unit. No lights on, nothing. To be frank, not even I thought it would cost in to repair it, since the owner told me it didn’t cost more than £20 in the first place.
Never mind, off with the cover and a quick poke around with the multi-meter revealed no power coming from the transformer within the unit. This converts high voltage from the mains to lower, safer voltages for the player. On this DVD player and many others I’m sure, the internal processes are broken up in to ‘cards’. On this unit, there’s a power card, a logic card for the motor drive and a video card for the picture. Closer inspection of the (cheap and horrible) power card revealed several faulty components, which had failed catastrophically. At first glance, I suspected that the cost of replacing individual components wouldn’t cost in and that sadly, this DVD player might be headed for the bin.
Fear not! With the power of Amazon, I was able to find a generic suitable DVD power card via China that fitted, with a small amount of wiring for £5, delivered. Job done.
For those wondering what an ‘inverter’ is, let me give a quick explanation: It allows one to use a mains operated device on the move, using a power supply from a motor-home, car or boat, as an example. An inverter ‘inverts’ a smaller voltage to a larger one, usually for most applications. Most inverters sold turn either 12 or 24VDC to 240VAC or 110VAC.
The owner of this one had accidentally connected the input wires the wrong way around, effectively reversing the polarity. Not good. Upon hearing a little ‘pop’ the owner quickly disconnected the power!
Having never worked on an inverter before, I turned to the manufacturer for advice. Sterling Power (UK) were not able to supply any product information on the phone nor via email and were generally not very helpful at all. They did offer a very reasonable 25% discount on a replacement, but were not able to offer much else to save the one I had in the workshop. Never mind.
Back to the problem. Checking the basics, the ‘accident’ had appeared to knocked-out three 25A soldered PCB fuses. Temporarily by-passing the fuses revealed a working unit, so replacing the defective fuses was a good idea at a very reasonable £1.50.
The fuses are mini-blade 25A automotive fuses. Once removed and the new ones soldered in place, the unit worked once more.
Cost of parts, £1.50, cost of replacement unit, circa £160.00.