Doorgaan naar hoofdcontent

Printplaat reparatie van : Brink Renovent HR uit 1997 met details en uitleg

Ik heb een nieuw filmpje gemaakt. 
Reparatie van printplaat van Brink Renovent HR uit 1997 met gedetailleerde uitleg en foto's.

Voor #BarryV van heb ik weer een printplaat gerepareerd. Het betrof een print van de Brink Renovent HR deze hebben als motor : EBM R1G140-AW05-12 en deze vind je regelmatig in WTW installaties die door Brink zijn geproduceerd.

Deze specifieke print had waterschade en hierdoor was bijna alles opgeblazen en kapot.
- CPU, motor drivers, FET eindtrappen, weerstanden en dioden, en een op-amp.

Ondanks dat is het toch weer gelukt om de print te repareren.

Het wordt steeds belangrijker om zorgvuldig met grondstoffen om te gaan, onderdelen en nieuwe producten hebben lange levertijden.

Reparatie en recycling is een goede optie, economisch en ecologisch en nu blijkt ook verstandig vanuit een geopolitiek perspectief, we zijn wel erg afhankelijk van een paar fabrieken geworden.

Leerzaam voor wie wat wil leren over reparatie van elektronica en globale opbouw van een motor stuurprint, of gewoon wat slimmer wil worden ;-)


Populaire posts van deze blog

Denon DHT T100 DESIGNED TO FAIL : bad caps (ceramic caps this time)

A friend gave me a Denon DHT-T100 to look at. Do not spend much time on it.. ok. It had a problem, it started clicking and ticking after power on, and after some time. (a so called intermittent problem) Sometimes it did not tick or click, but it was basically not usable. The clicking had a sharp click in one channel and repeated after about a second, then sound recovered and it would click and drop out again. He told me, do not spend any time on it, yeah, right. ;-) like I would give up after 15 minutes. I wanted to know what was going on with this thing, I found some schematic online and started measuring the usual things. The power supply, 24V did it drop down when a tick occurred ? Difficult to find out because sometimes the thing would play for hours without a glitch. I eventually found out the 24 V PSU, the step down SMPS on board and the LDO's were all ok, all power rails remained within spec, but it still glitched sometimes. (while power was ok) I investigat

Fixed voltage on cheap buck converter (MP1584) conversion with single 0805 resistor

Everywhere I look on the Ali and Ebays I see these step down converters based on MP1584. I bought a couple and actually they are not bad at all. The output voltage is set by the trimming-resistor in the left top corner of the picture. This works OK, but.. it is dangerous because it is rather sensitive to the touch. I decided that I wanted fixed output, so I had to figure out how this thing worked. The datasheet looks like this : R1 in the datasheet is what I call "R feedback" in my image. The value of R2 is mostly 8.2K Ohm in the boards I have seen.  So to set some common values for output voltage: change R1 to 27K for 3V3 output (actually 3.4 volt, but 27K is a standard value) or change R1 to 43K0 for 5.0 Volt output. (43 K is a standard value) A standard 0805 size resistor fits precisely, how convenient ;-). Make sure the other resistor is really 8.2K because that determines the feedback ratio. This way you can not burn up your circ

Raspberry Pi, PyFace Digital, the lost documentation, I found it finally

The Raspberry PI or R-pi from  is well known these days. It is not an accident that I have one, I have been doing Linux stuff since 1991, and professionally since 1996 I can not skip over these developments, have to keep up with the new kids. :-) Times have changed, hardware has become very affordable, everybody knows the Arduino , Raspberry Pi and Beagle-Bone-Black (BBB). Not everybody knows the stuff that  aka Acme-Systems and  aka  Olimex make, so I will endorse them here. Since I am an engineer I expect to connect switches and relays to the boards and some documentation with products, not so with the " PiFace Digital " board, it comes without serious documentation, not a even the schematic. All links on their blog point nowhere. People asked them many times, yet nowhere is the schematic to be found. I finally found some info after hours of google-work, someone made a c