ljcox
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Thanks Klaus. The information plate of one is different to the other even though they both look the same as the photo I posted. I have attached a photo of their information plates.This picture is not helpful.
We need technical informations...like exact part name or article number. A photo of the specification plate would be more helpful.
Klaus
Thanks, but there is no obvious output transistor. There are 3 transistors that look like low current ones. The main IC & the transistors have some sort of varnish on them which makes it impossible to read the numbers. The 4 pin IC looks like an opto coupler & it is between the high & low voltage sections. I suspect that the control may be at the high voltage side where the current is lower. The 8 pin IC is a dual Op Amp. There is a transformer (not shown in the photo) that supplies 25 VAC. It is followed by a rectifier bridge so the DC is +38 Volt. I would be able to work out most of the circuit by inspection & measurement, but I would need to know what the 16 pin IC is in order to work out how it all works. Thus I'm trying to find a circuit of it. See the next post for a photo of the PCB. I can read the number on the 4 pin device. It is L1012816B but an internet search for a data sheet was unsuccessful.The typical component for us to suspect is the one which sends charging juice to the battery. Namely an output transistor. If you can locate it then you might be able to measure voltage at its terminals.
Thanks, but there is noting obvious. See my comments in the previous post. I've uploaded a photo as you requested.Hi,
have you disassembled the charger? Maybe you can spot an obvious issue by means of a blown component.
Please upload a picture of the PCB.
BR
The yellow box is an X2 capacitor. Yes, the metal springs contact the battery.The yellow box looks like a relay. Is it labelled to carry 1.5 A?
Do you ever hear it clicking or buzzing when you try to charge a battery? In case it's stuck try striking it with a hard object.
There are 4 metal spring-clips. Do they contact the battery?
I don't know what you mean by a "smart charger". It automatically switches off when the battery is charged. Yes, it is a proprietary IC. I removed the varnish that was hiding the IC number using acetone, cotton buds & a lot of rubbing. See photo. So, if the IC is faulty, I won't be able to buy another.One of the springs is labelled NTC, which probably means negative temperature coefficient. I think a sensor detects when the battery starts to generate heat. That's a sign the battery is fully charged and ceased converting Amperes into electro-chemical storage. Charging should end at that point.
Is it a 'smart' charger? Then chances are the 16-pin IC is proprietary and unavailable. Unless you can find a component which is faulty, you may need to simplify how the charger works. Perhaps limit its output to a certain maximum charge rate and maximum voltage.
I take your point, but I think the batteries are OK as I have been able to charge them until recently. One is flat but the other can still run my drill. The other charger failed about 2 years ago. I would need another battery & a working charger to prove whether the charger or batteries are at fault.Hi,
NTC, smart charger:
Did you check whether the batteries are healthy at all?
My idea: maybe the chargers work well, but the batteries are old. If so the NTC signal or the "smart" piece in the charger detects the bad batteries and refuses to charge.
It's not unusual that different chargers have different thresholds what battery they call bad or good. Thus maybe one charger worked longer on "bad" batteries than the other.
Klaus
Thanks Klaus, I cleaned the last of it off using acetone & cotton buds. But there was nothing helpful under it. See the photo.Hi,
i guess ther is additional marking on the left side of the package, maybe underneath the coating.
Try to pull it off without scratching the surface.
Use alcohole to clean the surface it may make the laser markings more visible.
Klaus
On the bottom of the case, there is the number 2010 0100 which I assume is the year.Hi,
At least we can see the manufacturer logo: ST, ST microelectronics, SGS, SGS Thompson...
And 16 pin DIL package, and if you can find out the year of production it limits the number of hits.
It still could be a programmed device ....
Klaus
Thanks vfone, I'll read the post in the badcaps forum & report here once I've found the fault.Bosch AL2215CV charger fix - Badcaps
Technical discussion for power supplies. This covers PC supplies, and any other related power supply issue. When starting a new thread, please put the make AND model of your device in the thread title. Also be VERY descriptive of your issue, that way you'll get the best answer possible!www.badcaps.net
Thanks for the reply. I tested the TRIAC with my component tester 2 or 3 days ago. It is OK. I don't know if it can test the DIAC, I suspect not but I'll try.* Suspect components are ones that switch high voltage: the triac and the disc E8. These may not be easy to test without an oscilloscope.
* Do the battery clips have secure solder joints? These areas are stressed therefore the solder might eventually fracture.
* Can you measure 5V plus or minus 5 percent at the test points?
* An led is on the schematic. Do you see it light at any time? Or if not longer, did it go dark gradually or suddenly?
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