Yes I have 5x BC547C ordered at the local store, arriving next week.
Will see how I manage to desolder/resolder them, Im not very proud of my smd soldering skills...neither my sight
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Oh also I can see in my own pictures.. .that the second Q at the second relay is burnt by the end of the letter W...And I measured resistance from E to C in this transistor and it has 30 ohm on both polarities, which is not happening on all the other Q's
Should I just replace this Q?Last edited by edugimeno; 04-18-2024, 02:25 PM.Leave a comment:
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Biomass Boiler not driving cleaner motor relay. ENERTRES BIOMASA BI-650
Hi everyone!
I have this board that suddenly stopped supplying power to an output that drives an interchanger cleaner motor.
I checked while the board was in place with all wires attached and there's no AC voltage on the corresponding plug X5
This X5 is driven by fuse F8 (tested OK) which comes from the second orange relay
To make sure there are no charcoaled contacts inside the relay, I got a 24VDC power supply and got it ready to manually power up the coil side of these relays.
I respected the polarity, positive to cathode of protecting diode
So provided all the positives to all coils are common, I soldered + to this rail, and then applied negative to the other side of the relay coil.
With the first relay (not the faulty one), it clicked correctly on and off several times according to each time I touched it
With the second relay (faulty output), it clicked slowly and like "lazy" both for ON and OFF (some delay) and I got some smoke smell right away. Turned the board upside down and felt heat around both small Q's that drive this coil.
Can I have damaged the Q's that drive it? As the polarity is granted, they are all going + - + - + -....
Or is this just a sign that these transistors were the culprit for this issue?
I don't really understand the schematic (see images) for the driving Q's, it's like 2 different lines can drive independently the negative side?
Any help would be appreciated!
Thanks in advanceAttached Files -
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Burco BCPLSAFWM5L 5 Litre Wall Mounted Automatic Water Boiler With Filtration UK 240v
Does anybody have any experience with these Burco units at all there is no record of them on the forum lol and a proper service manual would be nice. I invite you all to pesuade me not to botch repair it with a 5v relay, read on.
This unit was rescued from a skip 3 years ago, the only fault it had then was no backight display (plus it wanted a new probe set and top seal) but the screen was never an issue you can still see the screen as is and I just use it to get 5 Litres of very hot... -
Hi,
i am asking for some Help.
I have one of these Nescafe Aeroccino (Milk Frother) things with a bad motor.
The Motor didn´t start anymore and internet is full of users just swapping the motor for a Mabuchi RF-500TB-12560.
So i got a few of these from Banggood.
I swapped the motor and now i have a new fault condition.
In a working Frother you would press the start button, it will light red and work for a few minutes.
If you press longer it will light blue and just mixup the milk.
With the new Motor it just starts... -
hi there,im having a look at repairing a wood lathe for my dad,(charnwood w821)the problem is when turning up the variable speed control,the motor starts to stop and start by itself,if i continue to turn up the speed it will trip the mcb in the consumer unit,there is also a slight smell of burning from the speed controll box.,Another strange symptom is the lathe can be unplugged from the mains after switching it off and the motor will spin a couple of times by itself,so far ive put a new speed controll potentiometer on and new motor brushes,ive also tested the motor windings and everything looks... -
Hi, I'm seeing one 9V relay having temperature 40C on its 9V (primary) side. Does that seem right? I switched 2 relays on that board and the temperature was the same (on the same position), so I'm sure it's not a faulty relay. I measured voltage on that relay and it was 9.5V DC, so that looks good. I don't see any other relay on that board having that kind of temperature and they have 9V on them too.
I thought maybe the transistor that is switching this relay keeps switching on/off, so I also checked for AC and there was almost none: 0.3V using mV range. No steady frequency was shown, but... -
I was working on this CNC machine today found no keyboard functioning no control relay powering on
The screen powered on and was giving an operation error but the manual was not very clear about what the error exactly was but with a little bit of troubleshooting and finding out that the control relays not powering on and no keyboard functions we narrowed down to this one switching power supply which of course does not have any indicator LED light they are on the keyboard interface/relay controller board
Found shorted diodes on main controller relays there are 3 of them that...
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