Q2 OPERATION AND MAINTENANCE MANUAL 9601 68
THE SIGNAL PATH
The Q2 is equipped with a microphone and a line input selected by
a switch and controlled by the same pot. The microphone input
may have a 20dB pad switched in and a phantom supply can be fed
to the microphone from each module. From here the signal enters
or by-passes a phase reverse circuit which is simply a unity gain
inverting stage. The signal then enters or by-passes the sweepable
high pass filter. At this point the equaliser can be selected pre or
post the insert point and from here the signal enters the cut SSM
followed by the fader, the fader buffer stage and the pan circuit
before going to the routing switches. A VCA version of the
module will allow for VCA level control and VCA muting.
THE RESET CIRCUIT.
A reset for the module logic is given by the RC network formed by
C41 and R142. On power up C41 will charge through R142
causing TR1 to switch on. This applies a low to the SET input of
the flip flop and a high to the reset input causing Q bar to go high
giving a channel ON condition. The RESET line is also fed to the
SOLO enable circuit.
THE SOLO SYSTEM
The Q2 solo system is a little more comprehensive than in other
consoles and there are some novel features about the way in which
it operates.
The SOLO button can be pressed fleetingly and the solo will latch
until the button is pressed for a second time. If the button is
depressed for a longer period then the solo will not latch but will
release as the solo button is released. There is also a facility for all
solos to be cleared by the operation of a master button on the
console.
The heart of the system is IC11 a dual D-Type flip flop. Normally
the reset pin will be held low and under this condition the state of
the Q output will toggle with each operation of the solo switch.
THE INPUT MODULE