On Sun, 12 Dec 2004 13:18:19 -0500, "tempus fugit"
put finger to keyboard and composed:
Sorry bout that - should've put that in m OP. It's a Sansui RZ-590.
There are a number of 1 ohm resistors (they are marked FR and have the
symbol of a fuse in series with a resistor?).
These are fusible resistors.
I know how to measure
voltages, but as I said in my OP, the unit is dead - it shuts down
immediately after power up, so there are no voltages to measure. There are 3
secondaries - a pair of reds with a black, a pair of blues with a white, and
a pair of browns. The one in question is the reds and black, which I assume
is for the high(er) voltage supply to the output IC, as they are connects to
50v electros.
Also, on further inspection, I found that the output IC, although mounted
well, doesn't have any of the pins actually soldered to the board. I don't
know if this could cause the fault, and I don't know if they have been
desoldered for a reason.
This IC is probably a hybrid amp (STKxxxx ?). The previous tech
probably desoldered it to isolate the source of a short circuit. Be
prepared to replace it.
thanks
"Mark D. Zacharias" wrote in message
...
The low resistance you measure may be normal. Some Sansui receivers had
bad
1 ohm resistors in the power supply. There's lots of possibilities. Model
number would help.
Mark Z.
"tempus fugit" wrote in message
...
Hey all;
I'm working on a Sansui receiver that shuts down as soon as I switch it
on -
no lights or anything. I've taken it apart and inspected the power
supply
section, and found that there is a very low resistance in a couple of
the
transformer's output wires. If I measure between either of the reds
(there
are 2) and the black (which is connected close to the reds, so I'm
assuming
that these taps go together) the meter reads about 0.6 or 0.7 ohms. Is
it
possible that this is the correct reading for this, or should I take
that
to
be a dead short? I get somewhat higher readings on the other taps - more
like 2.5 or 3 ohms.
Also, has anyone had experience with a reciever with similar symptoms?
Any
tips?
Thanks
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