SoundCraft SM12 User Manual page 35

Jumper Options
32
Oscillator
29
The oscillator, activated by the ON switch, produces pink noise or tone.
30
The oscillator signal is fed to the oscillator output, balanced at a nominal level
of +4dBu, on a 1/4" jack socket on the rear connector panel. The oscillator can also
be fed to the group and stereo mix busses by pressing the TALKBACK/OSC TO
BUSSES 'INT' switch (see 5 on page 28). The LEVEL control adjusts the level
from off to 10dB above nominal.
31
When tone is selected (see 33 below) the oscillator tone frequency is variable
between 63Hz and 1kHz: it is adjusted by the FREQ control.
32
The X10 button changes the frequency range to 630Hz - 10kHz.
33
Pressing the TONE button switches the signal from pink noise to sine wave.
Metering
34
Two 16-segment bargraph meters at the top of the module monitor the level
of the stereo mix or the external AFL/PFL signal, depending on the wedge default
jumper setting, or the current solo signal when a solo is active; the AFL signal from
the stereo mix is displayed in stereo while mono AFLs (from the groups) and
PFL/LISTEN signals (taken after the PFL trim pot) are fed to both left and right
meters.
The meter response may be selected as peak-reading or average by changing the
position of internal jumpers.
Function
Phones/Wedge Signal
(RH board SC3425)
JMP1
FOH Out DC Voltage
(RH board SC3425)
JMP2
Bargraph Response
(LH board SC3426X)
J301
(small meter board SC3426Y)
J401 **
** The small meter board must be removed to change this jumper
Options
jumper out for Stereo Mix
(FOH applications)
jumper in for Ext. AFL/PFL
(Monitor applications)
Enabled or disabled
peak or average
Default
Ext. PFL/AFL
Enabled (jumper out)
peak
Master Module