Thread: DME M42 Repair:
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Old 02-14-2014, 10:30 PM   #9
Artin318ti
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Join Date: Jan 2013
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Certainly

If you haven't soldered before I would suggest getting an old printed circuit board and practicing removal and installation, using cheap radio shack parts. YouTube videos will also help.

Removing the old transistor - When you remove the old transistor make sure that any solder residue is completely removed from the three connections, and that you start with clean holes for the new transistor. Use 'solder wick' to completely remove the solder from these connections. When done successfully the part should fall out. Don't use force.

Installing the new transistor - Orientation should match the original. Make sure you use solder that has a resin core (the resin helps clean the surfaces and spreads the iron's heat evenly on the components). When soldering transistors take care to not to apply heat for a prolonged time because excessive heat can actually damage the transistor.

Clean the connections to remove the resin from the terminals.

Good luck on your project.

A.
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