Your A must be the 2SA – V, A, 25W PNP transistors There are plenty of datasheets floating around when You ask Google. the only other transistors in this amp are 3 c and 2 a per File Type: jpg. To have more than an overview of transistor design and parts File Type: png such as 2SC/A, that are equally good or perhaps better here. at the datasheets for original BC V BC Philips – datasheet pdf. Download, [ A Datasheet PDF Downlaod from ] LOW FREQUENCY AMPLIFIER PNP EPITAXIAL SILICON TRANSISTOR PNP EPITAXIAL A board, A Bit, A filetype:pdf, A Reference, A voltage.
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All the usual suspects caps and solder joints a few touch-ups are fine. At this point, I would stop guessing and post the diagram so we can all have a good look. The usual function of the resistor is to monitor a particular circuit and send over-current information to a processor. I have also read about these power supplies with bad caps.
error HP MFP power supply – Badcaps Forums
The other voltages are unchanged. I plugged the supply into the printer.
I replaced the toner cartridge with a genuine HP cartridge. Thanks for listening anyway. So maybe tramsistor voltage was the problem and the off-brand low toner made it worse No error so far. I learned a tiny bit.
It went to sleep which is something the error state did not allow.
All times dagasheet GMT While watching my meter, I adjusted the resistor and was able to bring it down to 3. It’s been running for about two hours. What is the resolution of your meter? I’ve put the printer back together and turned it on.
It took a couple days but the error returned. The time now is I’m going to run the machine till it fails and re-read the voltages. Find More Posts by golemmaster. The “universe” won and I was just along for the ride. Service manuals say to replace the scanner board but I read in a transixtor other forums that it is actually the power supply that causes the problem.
Does anyone have experience with this or similar power supplies? In-circuit it reads 0. If you really have 3. There is a variable resistor transjstor the daughter board with the IC. Here is a useless update: I’m working on getting the pics up.
Is the voltage really 3. Or am I barking up the wrong tree? I realized my ESR-micro v3. In the printer’s old age, something drifted resulting in the 3.
BCB_PDF Datasheet Download IC-ON-LINE
If the sense resistor is supposed to be. Last edited by golemmaster; at The other outputs are as measured hransistor.
It would only take about 10 minutes or less for the error to come up. I’m pretty sure you can find the schematic for the supply. A current sensing resistor BPR58 0.
Still works with no errors and goes to sleep. The error also keeps the whole printer from powering down to low-power stand-by mode.
de.sci.electronics-FAQ V3.07 Stand: 6.7.2017
I’ve scanned and copied with it. I think you will find that it is similar to a computer power supply. If it were me I would just recap the power supply and be done with it I have a HP all in one printer that would keep telling that it was not available Really it plugged in the wall the Ethernet cable hook up I would have reload the software for the printer for it to maybe tranistor This is when I had with this printer and decided to recap the power supply and mother board of the printer before I send it to landfill and be done with it well after recapping both boards I not have any more problem with this printer Now my tablet dose not always show that printer available but is because HP app dose not pf want to work with the Lollipop operating system of this tablet but there is a work around that works most of the time save it as a PDF file and then print the page that you want Here is the link to where I had recapped this printer http: I’ll get some pictures up in a little bit.
After it told me the toner was low, it started behaving correctly.
Usually the 5 volt tranisstor is the one that is regulated via opto-coupler. I fixed the voltage prob and the rest eventually worked itself out?
I can’t work on it right now but I will get back to it sometime later.