What's made you grumpy today?

[chr1s]

Looking at the terminal block in the second picture the second from the left (blue) wire and fourth from the left (brown) wire are from the microswitch in the handle. The other two wires are to the motor.

I'd be very interested to know what it's doing so I hope you may have some idea.

Thanks again for having a go at this
Kindest regards
Jock

I know little about electric motors for strimmers, but I can identify the main components and hazard some thoughts on what the circuit is doing.

The 8-pin device on the left is a Microchip PIC microcontroller (identified by the signal names below it) so the circuit is software controlled.
The large semiconductor below the soldered wires is a triac (JST12 600BW https://datasheet.lcsc.com/szlcsc/Jiangsu-JieJie-Microelectronics-JST12A-600BW_C97632.pdf), rated to 600V max and 12A max, which would be used for AC power control. A triac conducts current in either direction (hence AC control) allowing a small control voltage to control a much larger voltage and current.
The rest of the circuit is probably mainly to provide a low voltage supply to the microcontroller and some switching noise suppression.

Without trying to trace out the full circuit, my guess is it's an AC motor and the circuit controls the power to protect the motor.

As Andy says, there is no sign of any damage to the components. This doesn't mean there is no damage but I would expect, with the mixture of high and low voltage parts, that damage to the PCB would be likely to leave scorch marks at the very least.

 

[dave]

Thanks Andy. I've no idea what a "DM" is

Its what hipsters call PM just to make dave cry i think

Some thing else that made me grumpy apart from people calling PM an DM. I put my viano up for sale on facebook got 30 people "pm" me chose one who actually asked if they could come with cash rather than the ones offering sill price with out seeing or just aking if its still for sale. they said would be here between 6 and 7, 10 to 7 i asked if they were on their way, they replied yes be there at 8, so i said ok, 8.20 i messaged to ask if they were lost they said yes as a road was closed, i gave then some directions around the only closed road i knew of, 10 minutes away, 8.55 they still did not arrive, i messaged again they did not open it and still haven't even now.

 

[Pugglt Auld Jock]

Its what hipsters call PM just to make dave cry i think

Thanks Dave - but I had to google Hipster to find out what it is I'm afraid!

Still don't know DM? Could it be Direct Message?

 

[Pugglt Auld Jock]

Nothing looks to be obviously burnt out but apparently that big yellow capacitor in the middle of the board is known to fail when used

As you say, nothing obvious is there? So I suppose, after five years and with nothing else to blame, it may well be that capacitor if it's known to be a weak link. Thanks for your help Andy.

Talked to my boy last night and he's decided not to bother with it - I get to keep the "bits" so maybe one day I'll risk an ebay "cheapie" PCB and have a go at getting it running again - maybe?

 

[Pugglt Auld Jock]

Many thanks to both DaveMcT and chr1s for all that info which I found very interesting - much appreciated. As I've said before, what an absolute wealth of knowledge we all have between us and it's just so nice that we are all selflessly trying to be helpful!

I think you may have hit the nail on the head chr1s with your guess at the circuit being some sort of power control. I just found this: https://www.which.co.uk/reviews/grass-trimmers-and-strimmers/flymo-650e which, as the machine has no manual speed control - there is no knob you can turn or anything else which lets you select speed - would seem to hint at there being some sort of automatic speed monitoring going on?

PS. Just looked up "Snowflake Generation" as I didn't know what that meant either!

 

[jimboy]

I'm getting absolutely sick to the back teeth of hearing the snowflake generation whining on about their a-level results. Don't get me wrong: it's not nice to have plans cocked up when it isn't your fault, but in the grand scheme of things, they could have it far, far worse...

It does get too much at times. Even before the virus, everything about their teaching and exam results is paramount to the rest of their lives and it seems if some don’t get good grades, it’s the end of the world and life is not worth living. Even on the good side when some bright spark gets straight A’s Mum and dad are there and they are jumping up and down and things will be just great for the future. I never saw any of that when I left school, not even on the TV. To be fair my generation walked straight into jobs, but no fuss. You learnt to grow balls and get on with it.

Of course, as I say everything gets done to death these days. The media to me, just seems to be all over everything. Sadly without exaggeration, social media sites that the young team patrol and exchange chat, there will be some committing the worst, of course a cry for help can go wrong. Problem of course this generation, well most are wrapped in cotton wool. OK that’s my lot for now:devil:

 

[varesecrazy]

They are now making a fuss about 16 year old exam results..

AFAIK ..at 16 ..you have the 2 options

Work
Education

At 16 education just means 6th form..or college.. 'as you were'then.

Work will be only too aware of the 'results..' or lack of

Will interview you.. and if you can turn up ..hold a conversation .. not scare anybody.. you may well be in with a shout

In 2 years time ..your last 2 years will stand for a lot more than 2018/20

Yes - the distribution of Uni places now is a mess.. but from recent experiences.. it wasnt great before hand.

Perhaps its time for a shake.up now the world..and its markets have changed.

 

[DaveMcT]

My wife is secretary for our local Rugby Club under 8s year group. Covid has drastically reduced how many groups are allowed on the pitch at any time but we have to follow Rugby England rules. That's restricted the days available. We are also down to one trained coach (plus helpers) so that further reduces the options. One mother made a right old fuss, because we were not playing on wednesdays (as we used to) or even better Mondays (which we never have). Her little darling is tired on a Friday and 7pm to 8pm means he get to bed late.

He will be nearly 8 and he has Saturday to sleep in. Really??!!!


At the other end of the scale... Year before last one of the boys very aggressively shoved my daughter - basically because she was scoring tries (tag game) and he wasn't. She does not score very many but there you go. The lad was sent off but his dad had him grounded for 6 SIX weeks and made him apologise properly. His boy is actually very talented, generally well balanced and loves his Rugby just as his dad does. I guess not every parent pushes the snowflake envelope.

 

[portland_bill]

Now that has triggered a thought.

How does rugby work when you all have to be two metres away from each other.
Are they all running around with a 2m stick to gently prod each other?

 

[isthisagoodidea]

Well it was yesterday ...but after deciding that I like the little Fiat idea we bought last year I have spent a bit of time and a little bit of money on it and it has kind of got under my skin ...and I use it more than our other vehicle a Mazda 4x4 pickup ...so all the things I have done to it have improved it ...Until yesterday when I did a daft thing and scraped one of the back doors on a low concrete post in town ...I feel a right twit ....

 

[DaveMcT]

Now that has triggered a thought.

How does rugby work when you all have to be two metres away from each other.
Are they all running around with a 2m stick to gently prod each other?

Funny you ask. (ha ha) The kids are not at risk as covid is little more than a cold to them if they catch anything at all. In which case why are their games being thinly spread across the field? Fair enough adults need to be careful nobody wants a dose of flu but the rules really are daft.

But hey, could be worse... One of ours had a minor* stroke - age mid 30s. Seemingly fit, with no prior health concerns. Has it stopped him? Nope! He's continuing coaching the kids.

* As if such a thing is ever minor!

 

[StevenRB45]

Autoglass body repair first quote through the gate 527.23...er no.

"Well we need to respray the passenger door"..for a car park crease that's about 1mm deep with no paint damage? The tail gate will need paint but damn you're adding a lot of time and and effort to what could be sorted with PDR that and possible colour match issues.

erm Next!

edit to add photo of what requires to be skimmed (I assume given he says they don't do pdr!) and painted

If you can't see it look at the reflection of the house front door below the mirror it's not quite right.



I only put it on cos I figured if we were getting the tailgate done might as well tidy the only other bits of damage up.

 

[dave]

fell @rse over t|t in and got covered in swan poop

 

[StevenRB45]

fell @rse over t|t in and got covered in swan poop

Is the poo also the property of the Queen?

 

[dave]

Is the poo also the property of the Queen?

if it is she needs to come clean it up. there is loads of it it comes out as thick as dog **** too then spreads out for some reason. they seem to do all all right were i feed them as that's where they now hang out when not in the water.

 

[puntofan01]

TV licence renewal: I hardly use bbc services, and quite frankly, I object to my money funding it. I think I'd much rather my money went to the government, so there's at least a slight chance it gets used for something vaguely useful! I genuinely wish I could surrender my TV licence, and just lose the bbc channels. Instead of funding that waste of money, I could then give my money to selected YouTubers, whom produce viewing material that's of actual quality!!!

 

[portland_bill]

Cat not well.
Drinking lots, not eating much, bizarrely, sitting outside in the rain.
Off to the vet.
Not sure. Could be a blockage, or a list of other possibles. Blood taken, results tomorrow. (£100, thank you)

Clearing out the litter tray, lovely job, no poo in last 24 hours. That could be a good sign, a good dose of laxative might sort it. Or might need intervention, seen that before.

 

[dave]

Cat not well.
Drinking lots, not eating much, bizarrely, sitting outside in the rain.
Off to the vet.
Not sure. Could be a blockage, or a list of other possibles. Blood taken, results tomorrow. (£100, thank you)

Clearing out the litter tray, lovely job, no poo in last 24 hours. That could be a good sign, a good dose of laxative might sort it. Or might need intervention, seen that before.

hope it turns out ok

 

[portland_bill]

hope it turns out ok

Thanks.

I guess you're referring to the cat, not the poo.

She at least did eat something this morning, so that's good.

 

[dave]

Thanks.

I guess you're referring to the cat, not the poo.

Yes i din't know she was a girl from the first post. sucks animals cant tell us where it aches