"N_Cook" wrote in message ...

On 26/07/2015 11:06, Gareth Magennis wrote:
The Insert socket is a normally closed switched stereo socket between
the Mic and Line amplifier and the rest of the channel circuitry. The
Tip is the Send, the Ring is the Return.
So inserting a mono jack will just disconnect the mic and line amp
signal from the rest of the channel, and short out the input (Return) to
the rest of the channel.
Effectively, all you are doing is shorting the signal going to the EQ
section and beyond.
There should be no interaction with any other part of the desk, and no
need for any, I have never heard of any Insert being anything other than
just an inline send and return.

The only thing you should notice is that any noise from the Mic/Line amp
in that channel will be effectively muted.


Gareth.





"N_Cook" wrote in message ...

Not got inside yet and before doing so, less I disturb something.
Inserting a mono jack in one of the input channel I/O Insert sockets,
kills throughput to phones and also amp hiss at the phones output. The
PMP1280 SM ,out there, does not seem to have a control line attached to
the I/O insert socket switches at all , so different there , unless
there is some sort of auto lack-of-signal mute circuit somewhere. At the
moment I wanted to rule out something silly in the way of a wrong switch
setting combination or something. The user manual shows nothing that
could cause this.

So normal action. If you plug a guitar , so mono jack, in those I/O
sockets then no guitar throughput, but other channels should be normal .
I'll try signals in 2 channels, different socket classifications, before
opening up.
It all seems a bit odd having a 1/4 inch socket, per channel marked
Line/Mic and not instrument, and the other one I/O , plus XLR for mic





Yes, a mono jack into the Insert socket will produce no sound whatsoever, it
is not an input socket.

However, if you plug a mono jack in part way, so the plug tip makes contact
with the socket's ring connector, you CAN often inject a signal into the
channel.
However, this part of the circuitry is at line level, so a guitar is very
unlikely to have enough output for this method to be useful.
You'd stand a better chance using the proper line input socket and the gain
control, or possibly the Mic amp with a suitable adaptor cable, or better
still use a DI box, that's what they are for.


Interestingly, the Power Amp Insert sockets are wired the other way - tip is
return and ring is send - so plugging a mono jack in these WILL overide the
mixers output and make sound.




Gareth.