User manual TL AUDIO VTC

[. . . ] OPERATION SECTION ­ CONTENTS 1. 1. 1 1. 2 1. 3 1. 4 1. 5 Introduction. Input Channel Overview. Precautions. Page Number 2 3 4 5 5 6 7 7 8 8 9 9 9 ­ 10 10 10 10 11 11 11 11 12 12 12 12 ­ 13 13 13 13 2. 2. 1 2. 2 2. 3 2. 4 2. 5 2. 6 2. 7 2. 8 2. 9 2. 10 2. 11 2. 12 2. 13 2. 14 2. 15 2. 16 2. 17 2. 18 2. 19 2. 20 Installation. AC Mains Supply. Control Room , Studio and Alternate L/S Outputs. Meter Bridge Connection. 3. 3. 1 3. 2 3. 3 3. 4 3. 5 3. 6 3. 7 Channel Module. Input Stage. [. . . ] If automation is fitted then the links should be removed (see Technical Section 3. 8) TECHNICAL SECTION Contents. Page number 36 36 36 ­ 37 37 37 ­ 38 38 33 5. SPECIFICATIONS Input Impedance (electronically balanced) Mic input: All other inputs: Output Impedance All balanced outputs: All unbalanced outputs: Maximum output levels Direct, Group, L/R (balanced): L/R (unbalanced): Insert sends: Maximum Gain Mic input to direct output: Line input to direct output: Frequency Response Mic input @40dB gain to direct output: Mix Noise Main L/R output (reference to +4dBu nominal): Master fader down: Master fader @ 0dB: With 32 channels routed, faders at 0dB, channels open: Group Noise (reference to +4dBu nominal) Fader down: Fader @ 0dB, no channels routed: with 32 channels routed, faders @ 0dB, channels open: Input Noise Mic Input Equivalent (EIN): (22Hz to 22kHz, 150 ohm termination, 60dB gain) THD+Noise (From 10Hz to 40kHz @ 0dBu) Direct output: Groups: L/R: Crosstalk Line input to adjacent channel: 2. 5 kohms 10kohms minimum 100 ohms 47 ohms +26dBu +20dBu +20dBu +70dB +32dB 20Hz to 20kHz +0, -1dB -97dBr -89dBr -75dBr -94dBr -92dBr -75dBr -127dBu 0. 02% 0. 03% 0. 03% -100dB @ 1kHz, -83dB @ 15kHz Due to a policy of continuous development, the above specifications are subject to change without notice. The figures represent typical values for signal paths stated. 4. 1 4. 2 4. 3 4. 4 4. 5 4. 6 4. 7 4. 8 4. 9 4. 10 4. 11 4. 12 4. 13 4. 14 4. 15 4. 16 4. 17 5. Signal Flow Diagrams. 39 39 40 40 40 40 ­ 41 41 41 41 ­ 42 42 42 ­ 43 43 43 43 ­ 44 44 44 ­ 45 45 46 46 ­ 47 47 47 47 48 48 ­ 49 49 49 49 ­ 50 50 ­ 51 51 51 52 53 1. 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. Power Supply Fault Finding. 35 CAUTION: THE POWER SUPPLY AND CONSOLE CONTAIN HIGH VOLTAGES (UP TO 250V DC) AND HIGH POWER CAPACITY, WITH A RISK OF PERSONAL INJURY AND FIRE. SERVICE SHOULD BE PERFORMED BY COMPETENT QUALIFIED PERSONNEL, IN ACCORDANCE WITH CORRECT ENGINEERING PRACTICE. IF IN ANY DOUBT, REFER SERVICE TO THE RETAILER OR DISTRIBUTOR OF THE CONSOLE. The external power supply contains a transformer with a number of secondary windings. These secondaries are individually fused, rectified and smoothed. The fuse ratings and the power supply rails to which they refer are marked on the chassis adjacent to each fuse. CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE, REPLACE FUSES WITH CORRECT TYPE AND RATING ONLY. DISCONNECT THE POWER SUPPLY FROM THE MAINS BEFORE REPLACING ANY FUSE. 1 is the view of the power supply connector from the outside, with the multicore cable disconnected. The voltages are approximate values, when operated from 230V AC mains supplies. Note that the 16V heater supply is floating, and cannot be measured with respect to ground. The power supply contains bleed resistors to discharge the capacitors when the console is not connected, but may take several minutes to discharge fully. [. . . ] The links that should be fitted are: 2TA: 2TB: EXT: J3 and J6, J2 and J5, J1 and J4. 50 The external monitoring inputs are routed off PC355 by the IDC cable at CN7, to the Control Room and Studio module, PC352. The console is fitted as standard with retro-style VU meters for the eight groups plus left and right outputs. Each of these meters also has a peak LED adjacent to it. Control of the meters and LEDs is from PC344, located on the master section rear panel and connected to the backplane, PC355, by an IDC cable. [. . . ]