Converting a DynaComp IIgs Power Supply from 110v to 240v
This is a simple post but I didn’t know it existed and thanks to Geoff from our friday night chat who pointed me in the direction of an Apple Fritter forum, that with a bit of reading enabled me to convert two of my 110v IIgs power supplies to 240v simply and easily. Awesome!
Step 1: There are two types of 110v iigs power supplies, ASTEC and DynaComp, this method only works with DynaComp, so the first step it to pull out your power supply and have a look on the underside to see what brand it is.
Resources:
Step 2: Take apart the Power supply, it has a lid of sorts held down by 4 screws, 2 normal screws on one side and 2 countersunk screws on the other.
Step 3: Remove the lid - NOTE the power supply contains HIGH VOLTAGE - make sure it is unplugged before working on it. Even unplugged, the capacitors on the power supply can store a charge for some time.
This will reveal the Power supply, no need to take it out of the enclosure, what you are looking for is the wire jumper highlighted below
Remove the wire with some side cutters, you could desolder it but I don’t really see the point, side cutters do the job and I don’t plan to put it back to 110v
That’s it - nice and easy, The fuse and Capacitors on my 2 power supplies were already rated for 240V so they should be on yours as well but have a quick look then reassemble and test. For the first test plug the power supply in to the mains but not your IIgs (make sure you have the power supply cover reassembled in case something goes wrong). It would also be a good idea at this stage to measure the DC outputs with a multimeter (5v, 12v, -5v & -12v) if all those check out plug it into your IIgs and enjoy.
