How to Think like a Repair Pro - Learn to Fix Random Electronic Devices, PART 2
Вставка
- Опубліковано 4 жов 2024
- Let's complete this repair - in part one we worked out how the circuit works and what components were definitely faulty. The parts needed were not available to buy locally so how about using some similar salvaged parts? It's all about the method of thinking it through to work out what we can use to fix the fault. Learn to think in this methodical way and you will be able to tackle most repairs
Part 1 is here: • How to Think like a Re...
I work in collaboration with:
The Electronics Channel (live streams with Carlos and Detlef)
/ @theelectronicschannel
Gran Canaria Uncovered
/ @grancanariauncovered (with Detlef and Julie. Not electronics related)
Det Builds Stuff - / @detbuildsstuff (Detlef)
Retro Upgrade - / @retroupgrade (Carlos)
For All Your PCB needs: free $5 discount coupon
www.pcbway.com...
Equipment used in my videos. These are affiliate links, you pay the normal price and I make a small commission.
TEST METERS
ANENG AN8009 MULITIMETER
s.click.aliexp...
amzn.to/4da4Q7h
amzn.to/4fsjkkm
amzn.to/3yuf03q
amzn.to/4fwQOOD
www.banggood.c...
KAIWEETS HT118E MULTIMETER
s.click.aliexp...
amzn.to/3yC0ZRe
amzn.to/3SHIEcy
www.banggood.c...
VC480C+ MILLIOHM METER
s.click.aliexp...
amzn.to/46Gg1Cm
amzn.to/3YwUjyn
MESR-100 ESR METER
amzn.to/3yxQ0Zd
amzn.to/3WSr73A
s.click.aliexp...
XC6013L CAPACITOR METER
s.click.aliexp...
amzn.to/4cf2lzm
amzn.to/4dw9cp5
TM-902C TEMPERATURE METER
s.click.aliexp...
amzn.to/4fAz44L
amzn.to/4fBxD69
LCR-T4 COMPONENT ANALYZER
s.click.aliexp...
www.banggood.c...
amzn.to/3X4rOHv
amzn.to/3Agcj6h
FNB58 USB ANALYZER
s.click.aliexp...
amzn.to/3MgBFnn
amzn.to/4dyLU1H
www.banggood.c...
PCI POST ANALYZER
s.click.aliexp...
amzn.to/4dd8ihw
amzn.to/3LTpeO7
TL460S PLUS PCI_E ANALYZER
s.click.aliexp...
amzn.to/3WEsdi6
TOOLTOP ET120MC2 SCOPE
s.click.aliexp...
amzn.to/4dCaz5L
amzn.to/4dxOYLt
FNIRSI 1014D SCOPE
s.click.aliexp...
amzn.to/3AdZqK1
www.banggood.c...
NPS3010W 30V 10A PSU
s.click.aliexp...
amzn.to/4dzl2yM
T12 STATION WITH M8 9501 HANDLE
s.click.aliexp...
amzn.to/46E73W6
M8 9501 HANDLE
s.click.aliexp...
YIHUA 982 Soldering Station C210/C245
s.click.aliexp...
FNIRSI HS-02 PORTABLE SOLDERING C210/C245
s.click.aliexp...
amzn.to/3Yv7Ma5
QUICK 861DW
s.click.aliexp...
amzn.to/3WDF4B5
amzn.to/4ci7rdW
PROS'KIT SS-331H
s.click.aliexp...
INFIRAY P2 PRO IR CAMERA + MACRO LENS
s.click.aliexp...
www.banggood.c...
amzn.to/4coSRle
amzn.to/4coSV4s
TOOLTOP ET13S THERMAL CAMERA METER
s.click.aliexp...
ET13S MACRO LENS
s.click.aliexp...
OPTICAL MICROSCOPE
s.click.aliexp...
usa.banggood.c...
amzn.to/4dzBA9G
TOMLOV TM4K AF FLEX
amzn.to/3LY0YKs
tomlov.com/pro...
TL866 II+ PROGRAMMER
s.click.aliexp...
amzn.to/3SGKL05
CH341 PROGRAMMER
s.click.aliexp...
NC-559-ASM FLUX
s.click.aliexp...
DESOLDER BRAID (I use size 8045)
s.click.aliexp...
s.click.aliexp...
HX-T100 SOLDER (0.6MM)
s.click.aliexp...
ESD-11 TWEEZERS
s.click.aliexp...
Learn Electronics Repair is now on Discord! Come and join the fun, it's free.
/ discord
If you would like to support this channel
You can send donations
www.paypal.com...
You can subscribe to Patreon
/ learnelectronicsrepair
You can click Join to become a channel member
Thank you
Richard
almost 12 for us but im in Arizona with 120 F today keep up with the training and knowledge. Thank you
I massively respect your chin up and keep cracking on attitude. Youre a strong man . And a good man from what I can see . Sorry to hear about recent events . Appriciate every video you upload . Keep going mate . Alot of people youve never met are thinking of you and hoping youre alright.
Having lived in Jamaica for many years I can tell you that it is just about the same as you are experiencing Richard...
Only a few points to note, on the electrical safety aspects of this heater.
1. The protective earth is via a painted hole and all panels of the case are not electrically bonded to earth.
2. The mains to 12V board is only mounted with a tie-wrap under the sticky backed foam to the case.
3. You did not use a mechanical mount for the relay, the relay may get warm a soften the glue.
Anything carrying mains should be mechanically mounted and a layer of extra insulation provided.
I would never just use a mains earth as the sole means of protecting life.
I would have done the extra work to make it safe and charged for it or thrown it in the WEEE bin, or just given it back with the plug cut off. then tell the customer that it could be made safe but that will be extra to the repair costs, The plug was removed as you would not return an item back to a customer in an unsafe condition. if they want to replace the plug then they are accepting the risk to their own life is in their own hands.
On point 3...If the replacement relay was rated for a higher current , maybe that would mean it wouldnt get as hot as the original relay, since it would have bigger contacts and dissipate heat better
@@reacey There should not be a lot of heat from the contacts. most of the heat if not all comes from the relay coil.
if you have mains voltages on any components it is not wise to use glue to mount it.
if you want to see how to make your projects safe for yourself and others try and find a copy of BS EN 61010 - Safety requirements for electrical equipment for measurement, control and laboratory use.
part 1 is general safety, part 2 covers heating equipment.
if you search about you might find an old version pdf a new copy would be about £450 if you had to pay for it.
I recognize that collection of relays! It looks a lot like mine, with salvaged TV relays, automotive and others. 😸
Great video. Thank you Sir
I think I would have mounted that relay on it's side so the next poor schlep (probably yourself!) that has to work on it can read the relay part number and values. I always try to be kind to future me.
Hi Richard, I was hoping you would show us how precise can one fine tune the heater using the small blue potentiometer and also using the thermal camera to show us how well the preheater distributes the heat. Thanks!
I have a LCR-T4 Transistor Diode Capacitor ESR meter. I think Richard has one. Can this meter be used for short circuit tracing in the same way Richard used the mesr-100 ESR meter in his beginner repair playlist to find shorts in Mostfets?
I was wondering what the trim pot was for? Maybe to adjust the temperature probe to actual?
Relays/contactors often stick in low voltage applications.
Richard, did you check the heater element for a possible earth fault?
Heya nice easy repair IF you have some spaare parts
I found it concerning that it was the normally open contact which was burnt on the original relay, especially since that wasn't even connected to anything. That would suggest that something else had been making contact between that leg and possibly the case. A fault in the relay would only have made it "always on" so that could not have been the problem.
Since you could see that someone had already done repairs I would suspect that something had been left inside the case and had got behind that circuit board but as soon as you started opening the case it released the pressure and it fell out.
Ideally there should have been some insulating material inside the case, behind that board, in particular where the live connection is made.
Your method of fixing it means that can't happen again so it isn't a worry going forward.
Richard how are you doing and coping? well i hope we are here for you .
Hi Dutch. Thanks, As you can see I'm doing fairly OK right now, I still don't know what is happening regards dates for the funeral, I was chatting with my mum yesterday. She also is doing OK and busy doing all the things that need to be done. I'm keeping myself occupied too, it's the best thing to do.
Stay strong and thanks for the videos!
@@LearnElectronicsRepair Good to hear keep busy we keep watching love your content thanks
@@LearnElectronicsRepairGood to hear you and the family are coping well, keep your high mate. 🤙🏼🇦🇺
Joe from Australia 🤙🏼🇦🇺
think now that the relay is glued down, it would be good to put a sticker inside the case with the relay specs for the next time it might need replacing
Nice job Richard. Quick question...with incandescent bulbs getting harder to find by the day what would you suggest as an alternative to the 'Dim bulb tester' that doesn't use incandescent bulbs? Thanks.
You can still get incandescent bulbs but only in formats other than standard domestic purposes so you need to obtain the base along with the bulb...
I use an incandescent bulb like this on my bench: 250W 120V Super Photoflood Incandescent lamp for my limiter. Does the job nicely for amplifier testing. (Note: 120V is used as I am in Canada)
Personally, I probably wouldn't stick a power relay directly to the metal chassis. If the Relay goes faulty like it did before, it is possibly sitting with a 230V potential, which may then create a path to earth with the 12V still working and powering the relay coil. Yes, that should trigger the circuit protective device if everything is functioning correctly within the household wiring, but I would prefer to mount it to an insulator.
There is a ground lead bolted directly to metal chassis. I don't think it's any more dangerous than having mains voltage on the controller board as per the original design, but I guess this is a matter of personal opinion. IMHO there is nothing wrong with your suggestion, we all need to do whatever we are personally comfortable with.
@@LearnElectronicsRepair the ground lead is via a painted hole! there is a chance that a knock and it will become insulated from the case via the paint. you should have scrapped the paint away.
Im sure the paint is either scraped off, or it has a star washer on it which will cut into the paint for bonding purposes. I could be wrong, since im not there
@@LearnElectronicsRepair yeah I saw the ground lead to chassis, and yes it was previously knocking the power out before the fuse had time to blow so hopefully protective devices were working. I love the fact they have just used whatever power supply from another device to provide the 12V, and cable tied it in place 😆...
When in China.....
@@shagreobe I would not have expected them to go that far. They did not go that far on my k40 laser and that has about 20kv flying about on the inside. I've a video showing how bad the earthing was, titled something like did the earth move you you darling. :-)
My k40 laser bought in the UK would never in a million years have passed any CE marking, I don't think that they have ever read the " low voltage directive " or the common standard EN61010 for electrical safety.
Who’s Richard?
Go to the home page of my channel and look what it says beneath the Title ua-cam.com/channels/FX1Z9N6aPWuCN_KR8UZ2vg.html