Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Is there anything i need to check in this. Will the output volt be 5 & 6v only while the relay is 12v. Please someone guide me on this circuit. Still I feel the problem is in SMPS rather than CCU failure.
The power outputs are exactly 5.0 and 6.0v at both poles. When the ON/OFF switch is pressed the 5.0v reduces to 1.2v. Unable to conclude whether the problem is in power supply section or the CCU. Any experts please guide.
- - - Updated - - -
PCB Images added.
Recently the washer died and while checking LNK304PN and R1 (22ohm), 4.7u450v was replaced to bring it online.
However when switched on, immediately getting PE error after ON symbol with wash cycle LED's blink. Pressure sensor (E1) is already validated.
The machine was working with a older...
Thanks team.. I do suspect this transistor is not a proper replacement for old one, as it's not switching with Vbe =8v.
Kindly suggest an alternate/equivalent transistor for 13001S 6BD that are available in market. I got only this from the shop when I asked for 13001S.
If the oscillation works then I may be getting AC and I don't think the transistor is moving to saturation as I get 300v across B-E although base voltage is 8v.
I have replaced the transistor 13001S 6BD with this 13001 8AV. Does this make any difference here. I am sure on the pins and checked...
I have R9 as 100 ohms and R7 as 680K. Before I tried R9 with 10 ohms also... I will check reducing R7 value whether it helps...
Also I have tried removing Z2 and Base gets 11v.. but no luck.
In all aspects the circuit gets DC voltage only and no AC identified after C5.
- - - Updated - - -...
I don't think my transformer is faulty, as my earlier test says that I get output when I do a manual switching through a bulb...
My concern is whether 8v is enough to switch this transistor and Z1 voltage of 0.5v is normal.
Now I have tried removing Z2 and Base gets 11v.. but no luck.
Any...
I have already opened D1 from board and connected a LED directly.
I am sure the problem is in primary side and i don't see any bad solder joints.
The transistor is not switching even in 8v means, does it needs more voltage. (I can see the max voltage is 9v for this transistor).
Also is it...
I have tried replacing C5 and I am able to successfully discharge it immediately after switch OFF mains, means C5 is working.
Also I am checking in digital meter with DC 1000v option, so obviously I think it should display DC voltage.
I am confused, whether the transistor needs more base...
Thanks for you update.
I have even changed the transistor and i don't see the transistor is open or short. The new transistor also doesn't switch.
I have replaced C4 which didn't help. Also R10 is good and I am able to glow a 60W bulb from collector and emitter of transistor.
A small test i...
I have a lamp charger using 13001 which is similar to mobile charger and dead recently. I have changed the faulty components 13001 8AV and 8v2 Zener and no other components found to be faulty.
Few detail for your analysis.
Collector to Emitter voltage is 300v. Base to Emitter voltage is 8.2v...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
