makita dc9700a 2p4m transistor charger repair

[blainenbecky]

the 2P4M SCR Thyristor 400V 2A NEC transistor blew in my Makita quick charger so I got on off ebay and put it in and thought I would share the process

the charger


the inside


the new 2p4m in place redy to solder in



the old one that blew apart


note the thermal paste ,it is a must have



the back side ,you can see where the board got hot



just before I soldered it into the board



then just snip off the pins


put her back together and boom bod'a bing



I got the 2p4m on ebay for 2 bucks ,the thermal paste was another 2 bucks,so all in all not to bad

 

[purdum]

Can you tell me how I test my charger. Like what voltage reading I should get from the tabs
Thanks Greg

 

[giavra]

Nice Work.Did it blow after you put the battery pack?Work well now with your battery?

 

[gungatim]

I have that same charger for a reciprocating jig saw. was just about to toss it since it quit working last week until I saw this post. THANKS!! I will definitely pull apart and see if I have the same problem before trashing it...