On Tuesday, May 12, 2015 at 1:33:59 PM UTC-4, Arfa Daily wrote:
Don't suppose anyone happens to have a service manual for a Pioneer DDJ-SZ ?
Having some difficulty getting one, even through the Pioneer route. It looks
as though the owner has managed to **** one leg of the XLR balanced output
on both channels. Once I had got inside it, I found a surface mount
something in series with the dead leg on each XLR. There is signal one side,
but not the other. They are designated P701 on one channel, and P702 on the
other, so in keeping with other Pioneer items, I'm guessing that to be
"Protector", except it doesn't look like the typical surface mount fuses
that Pioneer use in their other DJ units, which are usually very low profile
and have a letter on the top of them to indicate value.

This device is black plastic and about 2 x 2 x 3 mm. Standard sm cap or
resistor connections at each end. Stamped very clearly on the top is "10"..
But 10 what ? Could even be an inductor I guess, 10 uH maybe, but I would
then have expected its designator to be "L" ??

The other thing that puzzles me slightly is why you would have anything in
series with one leg and not the other on a 'balanced' output. Interestingly
though, I had a look at the schematic for the DJM 800 I think it was, and it
shows a 0.5A fuse - proper fuse symbol not a rectangular box 'protector'
symbol - in just one leg of the XLR again ... Thoughts anyone ?

Arfa

The fuse is to protect the output stage from damage caused by DC voltage coming into the output (most commonly when someone plugs into a mixer with Phantom power [+48V] engaged). It happen\s more than you think. I'm staring at (2) DJM-S9's that took full voltage and blew the fuses.