Use Basic Electronics Knowledge To Repair Industrial Electronics - Pure Methodical Fault Finding Pt2

Trying to get to do more of this on the bench. Do this every day with the whole machine still attached. Cheers!

Thank you that was thoroughly appreciated short finding is not my strong point but enjoyed your methodical approach

I like your new desoldering tool. It seems to work a lot better than your old one.

How much did you end up charging your customer? How come your customer couldn't get a similar board? Surely would have been cheaper.

Nice job finding the short Richard. Might be a waste of time replacing that part if the motor is dodgy though, as you said.

Turnstile card skidata sd420/06

Great episode, very handy techniques and approach. Many years ago I did my C&G 224 Pt 2 (and 3), while also studying my ONC and HNC in electronics. As you can guess from formal education, we never did much in the way of fault finding without a circuit diagram - which I now appreciate can make it easy. Your approach is methodical, experience-based and highly successful. No diagrams required.
Thanks for sharing.

Nice one, I'm just wondering if injecting voltage on that diode would have helped identify the driver immediately in this case without having to remove all the mosfets.

H-bridge (full bridge) motor driver.
Usually the motor is connected between the 2 outputs which gives easy control of motor direction w/o clonky relays.

Hi Richard, another good tutorial. One very good method to protect any easily meltable parts is using sel-adhesive aluminium foil (tape). Works much better than Kapton tape and is easily removable afterwards. Regards, Jerry.

Salam hello sir please I want the links for finding datasheet equipment, electronic

Good work ! must admit I was screaming test the device !!! just after you cut pin 1 I would have gone to pin 2 straight away ! especially as I know what a pig those that package can be to remove. Looking forward to part 2, will you take the board to the site as part of your repair and install it ?...cheers.

Another ripper tutorial. Legend.

I will appreciate if you can help me with resource material and guide to start my career in electronics. I am having a hard time understanding it cause lots of the resource material out in the open look abstract. Thank you

Cant wait for part 2. Enjoy your beer Rich
!!

love it. great teacher. Looking forward to part 2. See you tomorrow night.

Hi. Thanks for the video. It helps me a lot because I'm doing repair job too and I consider myself in the intermediate level in electronics repair. May I ask if you don't mind, how much do you charge in this repair? Is it based on percentage of new unit price which I do normally?

Love your content been binge-watching all of your episodes I wish I was watching them in order I have just started getting into electronics repair I have been doing industrial maintenance for over 15 years I want to broaden my knowledge of the equipment I use

[Looking forward to Pt2!]

Hi Rich , is the capacitor which was previously replaced connected to the faulty chip ? I still can’t think why they replaced it .I keep thinking that this provides a clue .
Having said that , I have never seen a component treated so poorly..it looks like they took it out with a mole grip!

Good analyses. Glad that electrolytic went, the bottom end, although partially-sleeved, was overhanging the out 2 pin on the H-bridge.

Hi Richard, i have a question to you :). Do PSU have influence on a GPU coil whine? Understandable if it was low quality PSU with unstable voltages etc. but i read on forums that people had corsair rm850x and after change on straight power 11 coil whine was ended... How to explain that?

Escape connector...lol

Great work 👌👍

I've designed a similar motor controller before and your drawing of the circuit at the end seems about right.

My 4 month old daughter loves your videos. I was watching one night when I thought she was asleep, but turns out she was just really focused on the video. Since then any time I put your videos on she quiets down and watches. Hopefully she will keep interested and she can move up to helping me at the bench when she gets older.
Your videos are great. showing the troubleshooting process and sharing your experience is more valuable than most the education I got from school.
Thank you from me and my daughter and please keep releasing these great videos.

You could probably use low melt solder to desolder those.

Is there a reason why you can't use voltage injections to find where the short is on the board?

Very nice!! Just a quick tip, if I may: low melt solder to remove those SMD components works like a treat! You don't even need the hot air after using it. Cheers! :)

sounds like a stepper motor controller chip

Heya lol this is part 1 and part 2 I already saw now it's a lot momre clear what you were talking about in part 2 lol

I love what you are doing please keep it up. I have recently picked up this as a hobby and your method of explaining your train of thought as you approach each project is nice and very informative.

One way to fix chips, is to heat it up lightly. To test it, electric clocks not ticking, when heated up at the ic, it starts ticking. This method doesn’t always works, but you don’t have to replace expensive ic chips.

I dont think the optics are to detect the door movement. Instead I think the optical sensor detects an plastic flag, screw or piece of metal, that is affixed to the wall, and the second optical detector might be connected to the cover of the device, at the hinge side, so a plasic pin will leave the sensor as the cover is opened.

The idea is, if somebody would jimmy the whole device off the wall with a crowbar, the flag, screw or metal piece would no longer be there (as its affixed to the wall through a hole in the device box), thus the device can call home and report the tampering over rs485. Same if plastic piece on cover door leaves optical sensor, which means cover on device was removed.

Thats confirmed by the reader block having a SIO connection. SIO is a alarm standard for connecting burgular alarms.

The rs485 have 3 pins because the middle is shield. Its indicated by the drawing, showing the end of a antenna cable with its outer shell connected to ground.

Don’t the white plastic sockets you de-soldered the pins from the board just pull off? No need to remove the pins then and no melting with the hot air. Love the videos by the way bud.

Anyone know the type of green connectors?

That's how to make it look easy. You inspired me to invest in a component dca75. This work offers moves like a chess game. Test and gather data, analyze and make a move. Then try to understand why. This is far from boring. Thanks for all you valuable insight and procedures. I'm investigating in equipment because I want this to be my new hobby and I will never give up on it, regardless of all it's challenges. Being an auto mechanic with all it's challenges didn't deter me and now I have the hobby I have been looking for. Many thanks for your inspiring work.

is it just me or do I keep hearing a High frequency pulse during the video ? Great video by the way.

One tool I find very helpful is a spade type soldering tip. I have a few Hako dual head units that have different tips, one is 30mm wide another is 12mm wide etc, they are pricey unfortunately but they are time savers too. You can heat 2 pins or 12 pins all at the same time (I hate heat heat guns) and the component will just drop out of the board (hopefully), this works well for in-line bridge rectifiers, which I replace a lot of. I've been doing this stuff for 20+years and am always learning something from your videos. You are a good instructor.

so many MELF resistors

Hi
I’m starting again as an electronics repair guy (got motivated by you super interesting video’s) and looking for a good electronic microscope.


Is the one you’re using still the exact same as the one mentioned in your list?
It seems yours is positioned way higher than the included arm would allow.

Looking forward to your feedback.
BR
Sam