9 May
1999
9 May
'99
12:55 p.m.
At 12:32 AM 5/10/99 +0100, Tony wrote:
Yes.
What are the dimensions of the core? The longest dimension (length
usually), and the thickness. The height should be 5/6 of the length.
Hopefully the laminations are not welded together like microwave oven
transformers. If the voltages checked out without a load, look for a very
good short somewhere.
The 5 Amp line fuse didn't blow?
-Dave
Eric wrote:
The transformer in my IMSAI's power supply is not long for this world.
Yesterday I discovered that even with only the CPU card, one memory card,
and the front panel installed, the transformer got *very* hot in just a few
minutes, and started emitting unpleasant smells.
Pull out all the boards and disconnect the rectifiers from the
secondaries. Does the transformer still get hot? A shorted diode or
smoothing capacitor will make the transformer overheat...
Assuming it still gets hot, it sounds like you have shorted turns :-(
Is there any suitable replacement that is still manufactured? Or, failing
that, does anyone have a spare for sale?
What are the ratings? Could you replace it with 2 transformers (one for
the 16V rails, one for the 8V)? Can you rewind the old one (it's not that
hard to do)?
It's probably easier to rewind the transformer than replace it with
SMPSUs.