I got a Malibu 600 watt transformer. Model ML600TW. When I rotate the
on/off knob, it makes the sound of smacking the outer housing with a stick.
A loud audible clank. Then it hums.
When I apply the tester to the bottom connectors, I can't get it to read
anything. Double checked tester with various voltage alkaline batteries on
DC, and they tested fine, so tester is good.
Is this transformer fried? Is the humming normal? Is that clanking noise
Mine did just about the same thing.
Upon opening, it was built very cheap. I
tightened the transformer laminations
the best I could, however, they were not
designed to be tightened. I dribbled
some shellac into the laminations and it
the hum tolerable. I think I also beat
on it with a hammer to tighten it as much
as possible. I've heard of people
dribbling glue, etc. to try to solve
Geez, now I'm really scratching the twins. Upon testing with a tester, I
don't get anything. When I hook up a test wire and run it to a spare lamp,
the lamp lights. Apparently, the transformer is still good. I can see no
user serviceable fuses or resets. I'm going to pull the cover and look
inside, but at least I don't have to go buy another one.
All that you are hearing is the timer contacts closing and the
transformer kicking in. I have had the same model as you for 4 or 5
years, what you are experiencing is normal. The transformer hum
usually lessens once it settles in and is barely noticable after that,
but yeah, when it kicks in one can hear it some distance away.
But if this thing is a transformer, isn't its output supposed to be
AC. That the tester will test DC doesnt' mean it is ok on AC. Each
setting usually has its own resistor, and even the switch contact
could conceivably be broken. Not that I think this has happened,
Bingo. The label says 110 in, 12v out, but doesn't say AC or DC. When I
just put it on the AC scale, it was 12.0 volts. I saw the automotive style
bulbs used on some of the lights, and ass-u-med that it was DC.
You learn something every day.
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