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IC5. It is possible to link the talk and comms system via SW5; when the link is active the output

from amplifier IC3 is summed into amplifier IC5 via resistor R10.

The amplified comms signal passes via the comms on switch SW6 to the output/input isolation

transformer T1 and the side tone comms cancellation circuit formed by the second half of differ-

ential amplifier IC5. This out going signal is fed to both sides of the differential amplifier where it

seen as common mode and is rejected. The amount of rejection can be adjusted by pre-set VR1.

The incoming signal is fed to the differential amplifier on one input only via transformer T1 and

resistor R45; the signal is there for seen as differential and is amplified. The output of amplifier

IC5 is fed via the comms level control RV3 to the headphone amplifier which is located below the

group meters in the back of the console. The signal can also be routed into the stereo headphones,

the local output and talk system via the link switch SW5.

The comms call lamp in SW17 is illuminated when positive DC (supplied from external intercom

equipment and referenced to the comms ground) is applied to the incoming comms signal. Opto-

isolator IC21 and transistor Q7 provide the sensing and drive for the call lamp whilst maintaining

isolation. When the call switch SW17 is activated opto-isolator IC20 connects a positive DC

offset to the comms signal to illuminate the call lamp on external comms equipment. The DC

signals and comms ground are normally referenced to the console 0VA via a 100R resistor R146

but if power is supplied to the comms power line all the comms connections are totally isolated

from the console ground by relay RA1. They will continue to operate deriving all power and

references from the external source.

The stereo head phones and local output levels are controlled by VCA’s IC8 to IC11. Their gain is

adjusted by DC voltages from fader RV2 and potentiometer RV1; switches SW1 and SW3 inject

DC to mute the VCA’s. The headphone and local output controls can be swapped over by switch

SW2 which routes the signal to vca buffer amplifier IC1. The local VCA is dimmed by 20dB

when the talk mic is on to avoid the feed back. This is achieved by introducing a voltage offset at

the vca buffer amplifier via resistors R13 and R121. The signal source to the VCA’s is selected by

switches SW5, SW6 and CMOS switch IC6. The CMOS switch selects between stereo solo

(AFL) and mono PFL signals and is controlled by the PFL monitor switch SW4 via transistors Q1

and Q2. They also control a second CMOS switch IC7 which routes appropriate signals to the

meters.

The VCA’s IC8 to IC11 are trimmed for minimum distortion by pre-sets VR2 to VR5 and

voltages are recovered from the output currents by amplifier IC12. This buffers the signals and

feeds headphone amplifier via resistors R87 and R90 and to the local output differential amplifiers

IC14 and IC15. Output symmetry is adjusted by pre-set VR6 and VR7 while high frequency

stability into any load is assured by filter capacitors C53, C54, C55, C57, C59, C60, C61 and

C63. Further filtering is achieved by T filters in the console frame and AC coupling is via C52,

C56, C58 and C62.

The talk system receives signals from the talk mic amplifier and can be linked to the comms mic

amplifier as described above. The talk mic amplifier signal is summed with other talk signals by

amplifier IC19. The other signals come from the oscillator, the pink noise generator and the

external input. Their level is controlled by potentiometer RV4 while the level of the talk mic

amplifier is controlled by potentiometer RV5. The talk switch SW10 connects the talk mic ampli-

fier signal and sends a DC level to dim the local output via transistor Q3.

The oscillator is a wien bridge type formed by amplifier IC18. Positive feed back via a band pass

filter sets up oscillations the frequency is adjusted by potentiometer RV6. Negative feedback is

Summary of Contents for XL4

Page 1: ...1 Operators Service Manual XL4 KLARK TEKNIK GROUP Klark Teknik Building Walter Nash Road Kidderminster WorcestershireDY11 7HJ England Tel 01562 741515 Fax 01562 745371 ...

Page 2: ...2 ...

Page 3: ...s of the above EU directives by meeting the following standards EN 55013 1990 EN 50082 1992 Signed Alex Cooper Authority Project Leader Date 28th November 1995 Attention The attention of the specifier purchaser installer or user is drawn to special limitations of use which must be observed when these products are taken into service to maintain compliance with the above directives Details of these ...

Page 4: ...should be connected to the cable screen All XLR and DIN connectors should have pin 1 connected to the cable screen AUDIO CONNECTIONS The console should only be operated with high quality screened twisted pair audio cables All connector shells should be of metal construction so that they provide a screen when they are plugged into the console All JACK connector shells should be connected to the cab...

Page 5: ...DER 14 XL422 MATRIX POD 15 XL441 MATRIX MODULE 15 XL4 MODULE OPTIONS FUNCTIONAL DESCRIPTION XL405 STEREO INPUT POD 17 XL404 STEREO INPUT MODULE 17 XL414 GROUP MODULE 19 MIDAS XL4 CIRCUIT DESCRIPTIONS 1 EARTHING SYSTEM 21 2 POWER SUPPLY 21 3 MONO INPUT POD 23 4 MONO INPUT MODULE 24 5 STEREO INPUT POD OPTION 25 6 STEREO INPUT MODULE OPTION 26 7 GROUP MODULE AND MIC INPUT OPTION 28 8 MASTER MODULE 31...

Page 6: ...ilter is set to 40K there is no loss at 20K 8 The HI PASS filter control acts on the mic input only and is continuously adjustable from 10Hz to 400Hz When the filter is set to 10Hz there is no loss at 20Hz 9 The METER monitors the peak signal level of the input channel pre fader When the GLOBAL METER CHANGE OVER switch on the COMMS module is activated the meter monitors the mic amp or line amp out...

Page 7: ...o 2 octaves with a 0 5 octave centre detent 14 The lo mid FREQ control gives continuous adjustment of the frequency range that the lo mid equaliser acts on from 100Hz to 2K 14 The INSERT PRE EQ arranges the input channel signal to pass through the insert point before the equaliser when activated and after the insert point when not activated 15 The BASS dual concentric top control gives continuous ...

Page 8: ...ect output This switch is under automation and auto mute group control XL403 Input VCA Fader 1 The SOLO switch sends the input channel signal to the PFL mono and AFL stereo busses If the switch is pressed for a short time it will latch on or off but if it is held on for more than 1 second the latching is disabled and when the switch is released the channel solo will turn off 2 The ISOLATE switch d...

Page 9: ...L busses If a switch is pressed for a short time it will latch on or off but if it is held on for more than 1 second the latching is disabled and when the switch is released the solo will turn off 4 The FADER CHANGE OVER switches swap the mono aux busses with the audio group busses so that the console can be used for monitor applications 5 The VCA GROUP switches assign the line returns to the 10 v...

Page 10: ...group control 21 The group SOLO switches send the group input signals to the mono PFL and stereo AFL busses If a switch is pressed for a short time it will latch on or off but if it is held on for more than 1 second the latching is disabled and when the switch is released the solo will turn off 22 The GROUP FADERS give continuous adjustment of the audio sub group levels from 10dB to off XL413 Grou...

Page 11: ...ting all outputs 5 The SOLO IN PLACE switch disconnects the three pre insert master signals left mono and right and replaces them with the stereo AFL solo busses This does not effect the master to matrix feeds which means the matrix mixes can be solo in placed on the master outputs 6 The mono INS switch connects the mono insert return signal to the mono mix 7 The VCA switch connects the mono vca f...

Page 12: ...djustment of the stereo master mix level from 10dB to off XL413 Grand Master A VCA Fader 1 The grand master A vca SOLO switch is used to monitor the grand master A VCA sub group by creating a corresponding AUDIO sub group on the stereo AFL busses All AUDIO sub groups that are assigned to grand master vca A will be summed onto the solo busses when the vca solo is active Note i When grand master vca...

Page 13: ...cept the talk mic and has a range from 6dB to off 7 The TALK TO AUXES switch sends the talk system signals to ALL the aux busses 8 The TALK TO GROUPS switch sends the talk system signals to any group buss which has its GROUP module TALK switch active 9 The TALK TO MATRIX switch sends the talk system signals to any matrix buss which has its MATRIX module TALK switch active 10 The TALK TO MONO switc...

Page 14: ...eter on the console except the comms meters and the record meters The normal meter operation is to monitor pre fader on input channels and post fader on all other signals When the global meter change over is active the meters change to monitor input amplifiers or bus amplifiers as appropri ate on all signals 22 The PFL MONITOR switch sends the mono PFL solo bus signal to the headphones and local o...

Page 15: ... 10dB to off XL422 Matrix Pod 1 The CHANGE OVER switches change the function of the left and right meters so that they monitor the stereo aux send outputs in place of the matrix outputs 2 The METERS monitor the peak signal level of the matrix or stereo aux outputs as described above but when the GLOBAL METER CHANGE OVER switch on the COMMS module is activated the meters monitor the matrix bus or s...

Page 16: ...x mix 10 The INS switches connect the matrix insert return signals to the matrix mixes 11 The matrix MUTE switches mute the matrix outputs but not the insert sends These switches are under automation control 12 The matrix SOLO switches send signals to the PFL mono and AFL stereo busses If the switch is pressed for a short time it will latch on or off but if it is held on for more than 1 second the...

Page 17: ...ol gives continuous and reciprocal adjustment of the stereo left and right signal levels by 10dB to 10dB This allows fine adjustment of the left and right signal levels and imaging 8 The HI PASS switch connects the high pass filter into the left and right signal path 9 The HI PASS filter control is continuously adjustable from 10Hz to 400Hz 10 The stereo input pod provides a left and right DIRECT ...

Page 18: ...tion control 14 The mono aux PRE switches change the signal sent to the mono aux busses from post fader to pre fader 15 The ST AUX controls 1 to 8 give continuous adjustment of the level sent from the input channel post pan to the stereo aux busses The level adjustment is from 6dB to off 16 The stereo aux ON switches connect signals from the input channel to the stereo aux busses and are under aut...

Page 19: ...l without the use of a pad 9 The mic line return PAN controls place the return signals within the stereo master mix and have a constant power law i e 3dB at the centre position 10 The mic line return MUTE switches mute the return signals and are under automation control 11 The mic line return SOLO switches send the return signals to the mono PFL and stereo AFL busses If a switch is pressed for a s...

Page 20: ...te the audio groups at all points except the insert send and are under automation and automute group control 21 The group SOLO switches send the group input signals to the mono PFL and stereo AFL busses If a switch is pressed for a short time it will latch on or off but if it is held on for more than 1 second the latching is disabled and when the switch is released the solo will turn off 22 The GR...

Page 21: ...nts within the console so as to eliminate circulating currents and interference Any additional connections between these points may cause noise problems or digital system failure 0VA 0VC 0VD and 0VS are con nected together at the power supply connector distribution board at the back of the console 0VD and 0VF are connected together at the power distribution board and other points within the fader ...

Page 22: ...wer supplies to be connected in parallel to one console in the event that one supply fails the other will continue to operate normally The circuit configuration is similar for all rails except for the polarity of some components The switch mode block output is first shunted by a differential filter capacitor network and then fed to a common mode choke The choke feeds a further capacitor network wh...

Page 23: ...rs which are second order active networks formed around IC2 The line input signal passes through T filters L3 and L4 and on to the differential amplifier formed by IC3 Pre set VR6 provides CMR adjustment and capacitors C23 C24 C25 and C28 provide additional high frequency filtering C29 and C36 provide AC coupling The signal passes on to amplifier IC4 which provides 40dB of gain adjustment in conju...

Page 24: ... The FET s are controlled from the automation system via shift register IC31 and CMOS switch IC14 After the insert and EQ the audio signal is buffered by amplifier IC15 and split to fed both pre fade mute and VCA circuits The VCA IC16 is controlled from the fader via the vca line and buffer amplifier IC19 Pre set VR4 sets the nominal VCA gain to 10dB and VR3 trims the distortion to a minimum FET s...

Page 25: ...nsistor Q33 and FET s Q29 Q30 Q31 and Q32 All bus switching is directly controlled from the automation system in the fader tray via data strobe and clock lines 1 and 2 The status of switch SW27 to SW49 is monitored by the automa tion system via resistor ladders R250 to R272 and analogue to digital converter lines 1 2 and 3 Positive and negative references for the resistor ladders are provided dire...

Page 26: ...e direct output lines The meter circuits are formed by amplifier IC8 which is configured as two peak responding half wave rectifiers and meter drive IC9 and IC10 0dB adjustment is via pre sets VR6 and VR9 Comparitor IC11 is used in conjunction with transistors Q22 and Q23 to provide a signal present led drive at 25dBu The direct output signals from the input module fed to the differential output a...

Page 27: ...de mute circuits in conjunction with amplifier IC7 Control of the mute and mute indicator is achieved via invertor IC20 and triple input AND gate IC21 The indicator will illuminate at half brightness if the solo in place is active and the solo line is not if the mute all is active or if the mute line is active If a link is fitted at ST2 the indicator will illuminate at half brightness when the VCA...

Page 28: ...tion system in the fader tray via data strobe and clock lines 1 and 2 The status of switch SW27 to SW49 is monitored by the automa tion system via resistor ladders R250 to R272 and analogue to digital converter lines 1 2 and 3 Positive and negative references for the resistor ladders are provided directly from the fader tray via 5V switch and 0V switch lines 7 Group Module and mic input option The...

Page 29: ...o is first enabled capacitor C42 creates a negative going pulse which is inverted and buffered by section D of IC9 This will clear any other solos but is prevented from self clearing by the logic low charge held on C39 once this capacitor has charged to a logic high the solo can be cleared by the solo clear bus via section C of IC9 If the solo switch is held down capacitor C38 dis charges and rese...

Page 30: ...plit to fed both pre fade mute and VCA circuits The VCA IC20 is controlled from the fader RV6 and buffer amplifier IC22 Pre set VR10 sets the nominal VCA gain to 10dB and VR9 trims the distortion to a minimum The VCA can also be controlled from the grand master vca fader busses which are connected via switches SW30 and SW31 FET s Q19 Q20 Q21 and Q22 create the mute circuit in conjunction with ampl...

Page 31: ... Bus inject signals are fed via T filters in the frame to differential amplifiers IC1 and IC3 Pre set VR1 and VR2 provide CMR adjustment and capacitors C1 C2 C3 C4 C10 C11 C12 and C13 provide additional high frequency filtering C5 C6 C14 and C15 provide AC coupling The left right and mono signals pass to the insert points via CMOS switches IC7 and IC8 which select either master or solo signals dep...

Page 32: ...ause the master feed to matrix is before CMOS switches IC7 and IC8 it is possible to solo in place matrix outputs without oscillation occurring even if they contain signal from the master module The record outputs are fed from the pre insert master left and right signals via potentiometers RV4 104 and RV5 105 to amplifiers IC35 and IC41 Their output is sent to the mute CMOS switch IC36 which is co...

Page 33: ...1 Their gain is adjusted by DC voltages from fader RV2 and potentiometer RV1 switches SW1 and SW3 inject DC to mute the VCA s The headphone and local output controls can be swapped over by switch SW2 which routes the signal to vca buffer amplifier IC1 The local VCA is dimmed by 20dB when the talk mic is on to avoid the feed back This is achieved by introducing a voltage offset at the vca buffer am...

Page 34: ...switches SW11 to SW16 The buffer for this is formed by ampli fier IC3 and transistors Q5 and Q6 The solo summing amplifiers IC24 and IC26 are used to recover voltage from the solo left right and PFL busses They are referenced to a clean 0VA or noise reference which is sent from the master module Capacitors C103 C106 and C121 provide AC coupling and capacitor resistor networks C102 C105 C120 R156 R...

Page 35: ...diode or action to take place when consoles are linked 10 Matrix Module The matrix module houses the group to matrix level controls the matrix insert and main outputs as well as the stereo aux output master controls The pre and post fader audio group signals are received via the edge connector SK3 CMOS switches IC16 IC18 IC20 IC21 IC22 IC24 IC25 and IC26 select pre or post fade signals to feed the...

Page 36: ...120 When one of the solos is first enabled capacitor C114 or C118 create a negative going pulse which is inverted and buffered by section B of the appropriate NAND gate This will clear any other solos but is prevented from self clearing by the logic low charge held on C116 or C120 once this capacitor has charged to a logic high the solo can be cleared by the solo clear bus via section D of the NAN...

Page 37: ...trol line A which selects between X0 X1 X2 X3 X4 X5 and X6 X7 When the control line is logic high the CMOS switch routes pre signals only Control line B selects between X0 X1 X2 X3 and X4 X5 X6 X7 When the control line is logic high the CMOS switch routes aux return signals only providing aux signals are selected by control line C Control line C selects between X0 X1 X2 X3 X4 X5 X6 X7 When it is l...

Page 38: ...lst transistors Q3 and Q4 provide constant current for the bar graph leds this is programmed by transistor Q5 which is driven from the console led I ref bus Transistors Q6 and Q7 provide adjustable current for the switch indicator led D21 ...

Page 39: ...6dBu Mic Pad 26dBu Channel Line Input 26dBu All other Line Inputs 21dBu CMR at 1kHz Mic gain 60dB 70dB Mic Pad gain 40dB 50dB Line 60dB Frequency Response 20 to 20kHz Mic to Mix gain 60dB 0dB to 1dB Line to Mix 0dB to 1dB Noise 20 to 20kHz Mic EIN ref 150 Ohms gain 60dB 129dBu Line EIN ref 150 Ohms gain 10dB 100dBu System Noise 20 to 20kHz Summing Noise 12 channels routed with faders down 86dB Lin...

Page 40: ...ive 600 Ohms Headphones To drive 8 Ohms Unbalanced Comms Bi directional 600 Ohms Nominal Unbalanced Maximum Output Level All Line Outputs 21dBu Headphones 21dBu 8W into 8 Ohms Comms Bi directional 10dBu Nominal Signal Level Mic 70dBu to 5dBu Channel Line Inputs 20dBu to 5dBu All other Line Inputs and Outputs 0dBu Headphones 10dBu Comms 20dBu Comms and Talk Mic 50dBu to 20dBu auto gain Headroom at ...

Page 41: ...nt 0dB Treble Shelving Freq Continuously variable 3dB point from 1K to 20K Treble Bell Freq Continuously variable centre from 1K to 20K Treble Bell Bandwidth Continuously variable 0 1 Oct to 2 Oct Centre detent 0 5 Oct Hi Mid Gain Continuously variable 15 dB to 15 dB Centre detent 0dB Hi Mid Freq Continuously variable centre from 400Hz to 8K Hi Mid Bandwidth Continuously variable 0 1 Oct to 2 Oct ...

Page 42: ... dB Centre detent 0dB Bass Shelving Freq Continuously variable 3dB point from 20Hz to 400Hz Bass Bell Freq Continuously variable centre from 20Hz to 400Hz Dimensions Width 2176 mm Depth 1120 mm Height 420 mm Nett Weight 229kg Shipping Weight 412kg ...

Page 43: ...nput Module LED FET drivers XL404 6 Stereo Input Module Switch data codec XL404 7 Stereo Input Module Left channel equaliser XL404 8 Stereo Input Module Right channel equaliser XL404 9 Stereo Input Module Main connectors PSU XL411 1 Group module Aux return XL411 2 Group module Aux return XL411 3 Group module Aux return XL411 4 Group module Bus summing aux send XL411 5 Group module Aux send group X...

Page 44: ...switching XL441 3 Matrix module VCA s solo insert return and output XL441 4 Matrix module VCA control voltage and mute XL441 5 Matrix module Aux sends XL441 6 Matrix module Aux sends decoupling and edge connectors XL4 20 LED switching XL4 I O XLR P C B XL4 Jack bay field XL4 Jack bay field XL4 MTX1 MTX mother upper connectors XL4 MTX 2 MTX mother lower connectors XL4_IP1 IP mother upper connectors...

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