Q2 OPERATION AND MAINTENANCE MANUAL 9601 63
A rotary pot is used to control the monitor outputs although not
directly. A control voltage is derived from the pot which is fed to
three VCAs on the sub board which control the monitor levels for
Left, Centre and Right. The monitor has associated MONO, DIM
and ON buttons and can be selected to carry CUE, TAPE, L/R and
Centre signals. If both the L/R and CENTRE buttons are depressed
then L C R monitoring will result. If no buttons are depressed then
CUE will be selected. Headphone monitoring is also available and
the left and right headphone feeds have the centre channel mixed in
with them. The headphones receive the same feed as the monitor
outputs of the console.
SIP monitoring uses the main mix outputs of the console in order
that an output solo does not cut the inputs assigned to that group
and the SIP signals enter the signal chain immediately before the
insert send points for the Left, Centre and Right mixes.
A RESET button disables any active cues on the console without
having to locate the soloed channel. The solo function is also
available for the L/R and Mono outputs of the console. A further
section of logic is associated with the solo function and the
operation is as follows.
First of all it is necessary to understand that input priority is the
normal condition in which any input solo will cancel an output solo
for its duration. Multiple input and output solos can be active in
this mode. Interlock mode means that only one solo in the console
can be active at any time. The reset button can be used to clear the
last required solo.
Consider first of all an input solo in the input priority condition.
The solo makes the output of IC44 pin 1 go low causing TR1 to
switch on which in turn causes TR2 to switch on giving INPUT
SOLO indication. Pin 7 of IC44 will go high as it will invert the
low from pin 1 causing TR4 to switch on which in turn switches
TR8 on. The causes the RESET line to stay in a high condition
which disables the solos on the output modules.