Hi.I've got a non-functioning casio ad-5e power supply that I've taken apart. I wanted to see whether I could salvage the transformer and make a supply for several stompboxes (and the keyboard, it's original purpose).I'm just wondering what I've got here.
The mains live seems to go through some mysterious two legged device before being connected to the primary (the device might be a UMI P4 X21, but I can't find a datasheet, this supply is probably over 7 or 8 years old).
The secondary appears to be comprised of 2 wires. There are three connections off the secondary. One each for each coloured wire and a central one with both connected. So I guess this is a centre-tapped transformer.
I don't seem to get any voltage across the secondary. My guess is that this miscellaneous thingy on the primary has failed. Any ideas?
Thanks very much.
It is highly likely that the thingy on the primary is a blows-once thermal fuse, and that it is blown. Could also be a hard-wired current fuse too, I guess, but thermal is more common on wall warts.
You may be skilled with AC power wiring, but I have to insert the warning: Unless you are already skilled with AC power wiring I advise you NOT to mess about with this. The transformer is likely to have been compromised at least once in the past as witness the non-functioning state. Beyond the normal dangers associated with AC power wiring, this thing has already shown some reliability problem, and is therefore more likely to fail again.
Thanks very much. I may well heed your warning also. I've got some other wall warts lying around that I might use instead. The thermal fuse makes sense and explains the other markings on it, ie. 102C, 3A and 250V (I'm in the UK).