i have a signal generator, what kind of signal and frequency does it need ?
i have a signal generator, what kind of signal and frequency does it need ?
Hello, i am working on one unit that suddenly stopped working. No crack solders , it was repaired 2-3years ago. I checked voltages and i got 160-170v. Only voltage that is problematic is 8v. IT has only 6.5. Nothing is getting hot and consumption is 160ma when powered. Should i change 7808 or it can be something else?
Last edited by digitalol; 25th November, 2018 at 04:02 PM.
Please finally solve the transistor 9732 I R 704K, BUZ 91 does not work. Thank you.
...IRF640...
zzivo (4th January, 2019)
Hello, i am working on 1 unit that makes me problem. I changes 9v regulator and all was working. Today customer calls me and told me car cuts. Car cutted suddenly on bump. Car then start and cuts after 10 sec work. I opened edu again and all voltages are spot on. 9v 12v 170v. Where should i continue looking for the problem?
unsolder all pins, and disconect board from camatitors and coil
put picture, and i show what need to soldering
regards
Hello, from last time i have 2 more with this same problem. I desolder the board, check all the solders and do resoldering. Check transistors, condensators, diodes all ok. I change stabiliser with 7809. Car works for anywhere from 20sec to 2 min and dies. I can pay for the solution of this problem...
Just solved one yesterday with this symptoms ,culprit was bad contact inside connector of spill valve .
Well i have cleaned the contacs and still the same. I make bench test with signal generator and light bulb... and the bulb is lighted and working. I leave bench test for 5 mins and no problem,, but when i put to car works 20 sec and shut down. I have 2 units and they have same problem, so must be something inside edu.
Hello Guys, I have a problem with one of these EDU, Can someone explain where the 12V from pin 4 goes to next? If I connect 12V in Pin 4 nothing happens, but if I feed 12V in the 1500uF capacitor I have all the voltages, 170V on spill Valve and 8.6V on the regulator.
Thanks
PierreTheron (22nd January, 2020)
buz91 also found buz31 inside..
Hi
I have problem with EDU
Disassembled, pcb removed, checked all solder, repair bad solder. Looks like all components good
Tried on bench with 60W bulb and 2kHz input, all voltages present, bulb light. Test run approx 1 hour, no problem.
On the car won't start with this EDU.
Car start with other, donor EDU...
What is the problem?
Any suggestion?
Tom
Hi Tom_x
Probably missing the 170 volt initial voltage.
The 12 volt holding voltage is working.
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