Adventures of a Tech, avonturen van een techneut

Ik heb een nieuw filmpje gemaakt.  Reparatie van printplaat van Brink Renovent HR uit 1997 met gedetailleerde uitleg en foto's. Voor #BarryV van repareerjeventilatie.nl 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 g...

My sister came walking in with her small Sony Radio/Cassette/CD-player. Of course there was a problem with this device The volume control was not working, when at "0" it would mute, but at low level it would just go too loud. Luckily I found a schematic online : http://diagramas.diagramasde.com/audio/HCD-EP30%20EP40%20sm.pdf After some investigation I figured out that the LC75392 was in control of the volume http://pdf.datasheetcatalog.com/datasheet/sanyo/ds_pdf_e/LC75392.pdf I traced the problem to the main circuit board and started measuring all the voltages (given in the schematic) and they appeared to be all right. I then used my new audio-sniffer to track the audio from the radio receiver. http://www.openmusiclabs.com/projects/audio-sniffer/ This is where I got one from Santa-Claus. Some example of someone else tracking a signal with the audiosniffer here on YouTube. http://www.youtube.com/watch?v=ZxUItbtYl_0 I noticed that I was getting a l...

A few days someone gave me a TS 201 RAID NAS made by Qnap to fix. http://www.qnap.com/useng/?sn=862&c=1697&sc=1698&t=1701&n=6731 It was very bad, the power light did not come on, it just pulsed a bit. The external power supply was broken, the capacitors 16V/1000uF swollen up. 12 Volt 5 Amps standard PSU, I had a spare so that was easily fixed. Trouble was not over, the device did not work. It beeped, lights were blinking, ugly noise from disk. Connecting to NAS did not go easily, I found the IP address by using NMAP (I assumed it was using DHCP) $ nmap -sP 192.168.1.0/24 .. some known machines.. and Nmap scan report for 192.168.1.217 Host is up (0.00034s latency). Connect to the thing using a web browser did not work. type in :http://192.168.1.217/ click 'administration' That redirected to a webserver on port 6000 why? New rules in Chrome and Firefox, blocking ports including 6000. I got something like this very descriptive message : ...

This week has been a hacking week. I repaired an old charger for a small fork lift, and finally fixed instability of my Raspberry-PI board. First the battery charger, an old 30 Ampere 24 Volt charger for a small fork lift. After switching it on, the lights would light up, some clicks would follow (detecting the battery and voltage), and then a low hum (transformer overloading) followed by a flash of the fuse exploding (on the circuitboard in the charger). After some investigation I found out that the rectifier bridge was bad, just one diode had failed and was completely shorted out, I have no clue why this happened at that moment, maybe just a cosmic ray or a spike somewhere, nobody can tell. The diode was a BYD57-200 (that is a press-fit 200 Volt 35 Amp version). Going through the usual catalogs online (Farnell/RS/Reichelt/Conrad) it appeared that nobody was selling these anymore. I ended up buying one at Brigatti in Eindhoven (  http://www.brigatti.nl/  ) it is a ...