User guide

35
2.3 Valve Replacement. 39
2.4 Valve Path Identification. 39
3. Input Bays. 40
3.1 Mechanical Construction. 40
3.2 Adding Modules to Sub-fitted Consoles. 40
3.3 Input Modules. 40 – 41
3.4 Replacing Mute Switches. 41
3.5 Input Circuit Description. 41
3.6 Input Stages. 41 – 42
3.7 Equaliser. 42
3.8 Faders and Routing. 42 – 43
3.9 Module Fault Finding. 43
4. Master Section. 43
4.1 Mechanical Construction. 43 – 44
4.2 Master Module Circuit Description. 44
4.3 Master L+R Outputs. 44 – 45
4.4 Group Outputs. 45
4.5 Mix B Outputs. 46
4.6 Aux Outputs. 46 – 47
4.7 Stereo Returns. 47
4.8 Oscillator. 47
4.9 Talkback. 47
4.10 Headphones. 48
4.11 Solo System. 48 – 49
4.12 Control Room Output. 49
4.13 Studio Output. 49
4.14 Logic Control. 49 – 50
4.15 External Monitor Inputs. 50 – 51
4.16 Metering. 51
4.17 Meter Bridge Option. 51
5. Calibration Procedure. 52
6. Signal Flow Diagrams. 53
1. Power Supply Distribution.
1.1. Mechanical Construction.
The VTC console mechanical construction consists of a number of “bays”, each of which houses 8
input channels, plus a further bay for the Master Section. Each bay operates as a sub-system with its
own grounding, PSU Regulators, and balanced audio signal connection between bays.
The external PSU provides rectified but unregulated DC which is connected via a heavy duty
multicore cable to the console. Inside the console frame, the raw DC is bussed to every bay where it
is separately fused and regulated.
1.2. Power Supply Fault Finding.