Hello! Does anyone have a diagram of this charger? After introducing the steel chips into the housing, I changed the appearance and I can not figure out what is what in the field of standard elements such as resistors, diodes, capacitors, etc.
I did an inventory of resistors and zener diodes. It should come in handy (Marking on the resistor in parentheses) R21 47 Ohm 5% R12 68 k 5% R8 51 Ohm 1%
There is a photo but the resistor marking is not visible and it is best to measure the diode. I suppose that ZD2 will be 20V because it is to stabilize the voltage of 22V and in addition there are 0.65V drops, diode and 1.4V optocoupler, hence 22V- 2.05V 19.95V? And the R20 resistor looks like 820Om designation (8200) connected in series with 330Om ??????????
Below is a photo
One AOD413A mosfet was also replaced with TO252 AP9567GH, both PC817 optocouplers, TOP258YN chip blew up resistors R8, R20 ????, R92, in R27 the inscriptions burned. the zener diode ZDE2 evaporated
For R20 I gave 820 Ohm and the zener diode 20V. I haven't turned it on yet, I'm waiting for help.
Dear gentlemen, I would like to add that the charger was previously tortured by a fachman, which is why it was in this condition.
With R20 820? elements, the Zener ZDE2 20V diode, the charger started charging one battery, but on the other one the TOP driver burned down again. The second time I also replaced the R12 68k? / 5% resistor and in its place I put two 150k? MŁT in parallel. Now she has two batteries charged and looks like GIT.
The voltage at the output of the converter is 21.75 V, and the 18V batteries charge up to 20.7V.
As soon as the charger plugs into the socket and then removes the plug, I will insert the batteries immediately after removing the plug. Then the charger freezes and you have to wait about 10 minutes before it detects the battery again. [and] Do they have that?
Hello, I would like to refresh the topic. I have a broken plate from this charger, unfortunately it fell off that paths continue to U3. I do not know what I would be like, but someone may know the replacement or the original. I would also need information where each leg of this chip is to hit because I do not know. greetings
Added after 30 [seconds]:
Hello, I would like to refresh the topic. I have a broken plate from this charger, unfortunately it fell off that paths continue to U3. I do not know what I would be like, but someone may know the replacement or the original. I would also need information where each leg of this chip is to hit because I do not know. greetings
Hello, I have a problem with the above charger, the batteries are charged for a very long time. I do not know if the problem is the missing capacitor that broke off the board and I have a request if someone could tell me what the value of the c42 capacitor should be.
