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Click any of the following links to jump to the. And than often the secondary CrapXons D8 which I have suitable replacements for, finally. It may start with no load making an impression it is actually OK. I have tens of them with bad caps only datqsheet at least for me, statistically, that is minority.
Try Findchips PRO for dm 8 pin ic. If Vcc drops to 7 volts or below, the chip turns off. I would start with that and that may be just it – mostly from what I have seen, the stand-by is not able to operate properly with any load when the capacitors go bad.
Originally Posted by selldoor: Also, if the Vcc goes above 20 volts it turns off. To sustain operation, it depends on the feedback voltage from transformer T2 thru diode D41 to provide Vcc voltage on pin 2 of the DM chip.
dm11 Take it as a simple static linear power supply – it is designed for some exact current; as other linear PSUs, it basicaly burns most of the power we do not want, here on the 1M resistor. Anyway, thanks for your valuable input, I see these PSUs quite a lot, but never had time to dive so much much into these tanks datawheet shit I will start with replacing the secondary diode, the zener and the R44 resistor and see.
Than the rest is taken down to voltage we want with zener and the IC is fed with that. Originally Posted by everell: Hopefully this information helps. Seems they have been using several different ICs but with practically the same circuitry.
DM Datasheet catalog
It is possible I get some of those FSPs too and that would be helpful in troubleshooting them. Worked great and no more 5vsb headaches.
If the chip or any of these four transistors short, it can load the feedback winding voltage such that it never goes above 9 volts. CodeWarrior CD for the latest up-to-date information. It had multiple problems. Step 7 – Generation of driver code. Originally Posted by Behemot: It is notinductance. I don’t know how much the zener can handle but I won’t expect much more than 50 V, than the current through it would be too high.
And here are some drawings Attached: So there should be some V drop with zener dropping it further to 20 V. I did a comprehansive study on this power supply board a few years ago. CT as well as hour customer service and technical support from 6 p. Sim ple Attenuationrequirements of the application and can be calculated.
So I think huge resistor is there to ensure slow enough charging of the Vcc cap otherwise there would be huge spike through the IC, auxiliary transformer windig and to the cap. CT as well as 24.
(PDF) DM311 Datasheet download
And shorted shottky diode on secondary side, I wonder if that was what killed the primary, or the other way around? Than the zener is supposed to do all dm3111 work and can go short….
But I don’t understand the purpose of the resistor, why have it there at all if the DM can handle up to v on Vstr? The voltage on pin 2 of the DM must be above 9 volts, typically 12 volts.
FSPGLN worth fixing? – Page 3 – Badcaps Forums
But digging further it looks alright. To turn on and stay on, the feedback voltage must increase datashdet a minimum of 9 volts. Step 8 – Verification of the files.
Starter for 10 newbie question I have tested the DM using primary ground – neg leg on Big cap. I am now going to test CM well some pins Do I still have to use primary ground for this? It adtasheet the same board under the Sparkle brand. The Vstr resistor is a current limiter. Now I don’t fix two transistor 5vsb circuits on Bestecs. Do I still have to use primary ground for this?