AD114 User Manual - Audio Services Corporation
Contents
1. VU meter there 15 one preset on the VU meter PCB for meter adjustment Set an input module for a line input and introduce a 1kHz tone from an audio signal generator Adjust levels to achieve a reading of 4dBu at a main output on an AC millivoltmeter measured across pins 2 amp 3 on the output XLR Select the meters to L R and adjust the preset to give a reading of OVU PPM meter the driver PCB has three calibration controls presets adjusts the reference level VR2 and VR3 adjust the law of the meter VR2 adjusts the upper sector of the scale and VR3 adjusts the lower sector To initiate calibration set each preset to its mid position BBC scale using the tone generator and millivoltmeter as described above adjust mixer levels for a reading of OdBu on the millivoltmeter from a main output Select the meters to L R and adjust VR1 for a reading of 4 Increase the output signal to 8dBu and adjust VR2 for a reading of 6 Decrease the output signal to 8dBu and adjust VR3 for a reading of 2 Repeat this procedure until an accurate set of readings is obtained without further adjustment to any of the presets being required Now check all points 1 to 7 on the scale to determine whether they are within specification N10 scale for a meter calibration of TEST With a main output signal of 6dBu adjust VR1 to give a meter reading at 6 Increase the signal to 6dBu and adjust VR2 to obtain a meter readi2. 1 Stereo output XLRs L amp R 2 Mic Line input XLRs 3 External DC power input 4 Stereo return jack 5 Subsidiary connector AD 114 Audta 11 All input and output impedances and levels are to be found in the TECHNICAL SPECIFICATION All inputs to and outputs from AD114 are to be found on the connector panel except for the monitor output which is mounted on the bottom panel facing the operator Module connector 2 accepts balanced microphones and balanced line level inputs XLR input 8 output Pin 1 Shield Pin 2 Signal Pin 3 Signal In the case of unbalanced line inputs and outputs pins 1 amp 3 should be connected This will not lead to a loss of level Main stereo 1 outputs are transformer balanced and are at line level The stereo tape return enters the mixer on a standard A type stereo jack 4 left and right Each input is unbalanced Unbalanced headphone monitor output appears on an A type stereo jack This output is capable of driving 25R at OdBu STEREO UNBALANCED JACK Tip Left signal Ring Right signal Sleeve Shield The 15 pin D connector Multiway 5 carries output and return signals to and from external devise within one cable NORMAL IDC Pin 1 1 Chassis Pin 8 15 Chassis Pin 2 2 Spare Pin 9 2 Output Left Pin 3 3 Spare Pin 10 4 Output Left
3. Pin 4 5 Spare Pin 11 6 Output Right Pin 5 7 Spare Pin 12 8 Output Right Pin 6 11 Spare Pin 13 10 Return Left Pin 7 13 Spare Pin 14 12 Return Right Pin 15 14 Spare A three position rocker switch BATT EXT selects either internal batteries or external DC source Power to the mixer is confirmed by the MIX ON LED on the power module The LED flashes when the internal voltage falls below the safe operating level of 6 7V External powering of the mixer 15 via a 4 pin XLR 3 XLR Pini OV Pin 3 NC Pin 2 NC Pin 4 9V 15VDC A suitable external power supply is Audio Developments AD100 09 but any external DC source must be capable of delivering 600mA at 12V 13 MICROPHONE LINE INPUT MODULE 1 Microphone power 2 Microphone Line select 3 Input gain control 4 Phase change 5 High pass filter 6 EQ Selector 7 Routeing Select 8 Pre fade listen 9 PFL indicator LED 10 Overload indicator OL 11 High frequency control 12 Mid frequency control 13 Low frequency control 14 Channel fader The Microphone Line input module functions are as follows Switch 1 selects 48V phantom power for condenser microphones Powering may be selected before or after connecting the microphone but switch off all powering on unterminated modules to ensure unconditional stability of the mixer For complete safety of external equipment switch off mi
4. 16 C9 CER47L 16 C5 C8 CPE1N 63 C10 C13 DIN16MRA CON1 DIO 1N4148 D1 D2 D3 D4 D5 D6 D7 FET BF256A LED 5X2 LED1 MIC1 MC1 NPN BC549C PNP BC559B TR1 TR2 TR5 2 VR2 POTA2 50K NE PUS204 51 52 54 PUS404 53 RESM1 8 100R R5 R9 RESM1 8 180R R15 RESM1 8 750R R16 RESM1 8 1K1 R12 RESM1 8 2K4 R10 RESM1 8 5K6 R7 R30 RESM1 8 10K R1 R2 R6 R18 R19 R23 R24 R26 R29 RESM1 8 15K R11 R13 RESM1 8 47K R14 RESM1 8 100K R17 R18 R25 R28 4 RESM1 8 220K R8 R20 R21 R31 ek eek RESM1 8H1M TRM CRT 500K 26 OUTPUT R H BOARD PARTS LIST ltem GO GO 11 12 13 14 15 16 29 Part Number Qnty CAD Part Ref Ref Designator 74 120 002 74 130 001 74 920 000 18 001 217 18 001 245 18 001 213 18 015 507 18 015 411 18 015 213 18 015 217 18 001 409 18 001 213 18 015 215 18 015 217 18 015 217 2 AMP 062V IC1 IC3 2 AMP 064V IC2 6 4 AMP LIB LIB1 LIB2 LIB3 LIB4 2 CAPCER22P G C8 C50 2 CAPCERUff4N7 C61 2 CAPCERU 10P C14 C55 2 CAPCERU 22P C9 C51 4 CAPELEC1 0H1 C12 C13 C56 C57 2 CAPELEC4 7E1 C1 C48 8 CAPELEC100C1 C10 C11 C19 C20 C23 C24 C52 C53 2 CAPELEC470C1 C7 C49 2 CCU 4P7 C31 C37 2 CCU 10P C18 C22 2 CER22 16 C32 C38 2 CER47 10 C62 63 2 CER47L 16 21 25 USE_STANDARD_WIRE 16 CONWWIR CONWWIR 1 CONWWIR 1 74 020 002 27 023 002 72 010 001 72 025 005 5
5. M S domain the matrix will transform the mixer output into the L R domain for monitoring purposes Selection of RET 14 will allow these functions to be performed on a tape return signal The level of the monitor signal is controlled by potentiometer 17 The level of the return signal is controlled by a present potentiometer 13 This allows for calibration of the return signal For a OdBu signal the system is calibrated when the preset is fully counter clockwise From that point 20dB gain is available for lower level signals The signal from the internal microphone 4 allows the mixer operator to add a voice signal to the main output by operating the switch marked SLATE 3 The level is controlled and set by preset potentiometer 12 17 ADJUSTMENTS AND CALIBRATIONS Meters are to broadcast specification and either a VU or a PPM may be selected A choice of 3 scales 15 available for the PPM 10 SDR Line up tone oscillator the preset VR3 that adjusts its level at the output of the mixer is mounted on the output module printed circuit board Low battery indicator the preset VR10 associated with this facility is also mounted on the output module printed circuit board The low reading is set the factory and corresponds to a set of batteries having discharged to 6V On a VU meter low volts is at OVU On a PPM meter it is indicated by a separate marking yellow on a scale and red on an N10 and SDR scale
6. for phantom powering If an external power supply unit PSU is to drive the mixer a current capability of at least 400mA is required It is poor practice to run a PSU at its limit therefore we recommend a minimum of 600mA Audio Developments AD100 09 PSU 15 a suitable unit WARNING When NOT using the PSU AD100 09 supplied for the mixer ensure your 4 pin XLR is correctly wired to match the POWER IN connector Failure to do so may result in the breakdown of the internal DC DC converter Make this check even if using a PSU which may have been supplied to you in the past eg AD100 06 THIS PAGE IS BLANK TECHNICAL SPECIFICATION ELECTRICAL REFERENCE 0dB 775mV 1kHz unless otherwise stated MAX GAIN MAX INPUT LEVEL INPUT IMPEDANCE MIC POWERING MAX OUTPUT OUTPUT IMPEDANCE FREQUENCY RESPONSE HARMONIC DISTORTION OVERLOAD INDICATOR CROSSTALK NOISE EQUALISATION MIC 70dB LINE 40dB LINE 6dB MIC MAX GAIN 44dBu MIN GAIN LINE MAX GAIN 14dBu MIN GAIN 20dB STEREO RETURN 18dBu MIC gt 2k5R LINE gt 6k5R STEREO RETURN gt 100kR 48V PHANTOM 23dBm L R TRANSFORMER BAL 18dBm HPHONE MONITOR UNBAL lt 60R L R lt 20R MONITOR 0 1dB L R 0 1 5dB MONITOR PATHS lt 0 05 1kHz 0dBm OUTPUT lt 0 15 40Hz to 15kHz 15dBm OUTPUT ILLUMINATES 15dBu at PRE FADER POINT 70dB 40Hz to 15kHz INTERGROUP amp INTERCHANNEL MIC lt 126dB EIN 20Hz to 20kHz 200R SOURC
7. 1 8 1K1 R27 36 70 031 076 1 RESM1 8 1K5 R38 37 70 031 078 1 RESM1 8 1K8 R37 38 70 031 079 1 RESM1 8 2K R39 39 70 031 084 2 RESM1 8 3K3 R5 R7 40 70 031 086 1 RESM1 8 3K9 R28 41 70 031 092 4 RESM1 8 6K8 R1 R8 R53 R62 42 70 031 096 2 RESM1 8 10K R31 R65 43 70 031 104 8 RESM1 8 22K R10 R11 R12 R29 24 70 031 108 70 031 112 70 031 120 70 031 132 70 031 136 82 257 801 81 217 502 81 227 502 86 010 101 DA ek Aba ek ek 55 R57 R58 R63 RESM1 8 33K R48 RESM1 8 47K R43 R45 R66 R67 RESM1 8 100K R34 R36 R44 R47 R49 R51 RESM1 8 330K R40 RESM1 8 470K R41 ROT1061 SW5 TOGO06 51 S2 54 56 TOGO08 S3 TXA A187A1C T1 25 OUTPUT L H BOARD PARTS LIST ltem GO oo GA DO Part Number Qnty CAD Part Ref Ref Designator 74 120 001 74 120 002 74 120 003 18 001 256 18 045 017 18 001 205 18 015 507 18 010 213 18 001 321 18 015 505 18 015 411 18 015 213 18 015 217 18 045 009 27 023 002 72 010 001 72 025 005 40 615 001 44 001 001 72 021 001 72 022 001 52 040 416 52 055 416 82 126 003 82 146 002 70 031 048 70 031 054 70 031 069 70 031 073 70 031 081 70 031 090 70 031 096 70 031 100 70 031 112 70 031 120 70 031 128 70 031 144 32 050 074 061 2 062 IC3 AMP 071CP CAPCERU 100N C1 C2 CAPCERU 220N C7 C20 CAPCERU 2P2 04 CAPELEC1 0H1 C6 C19 CAPELEC330C1 CCU 47P C16 C18 CER 47L 50 C14 CER4 7 35 C15 C17 CER10L
8. 2 055 416 82 126 003 70 031 040 70 031 048 70 031 064 70 031 072 70 031 096 70 031 103 CONWWIR 2 CONWWIR 3 CONWWIR 4 CONWWIR 5 CONWWIR 6 CONWWIR 7 CONWWIR 8 CONWWIR 9 CONWWIR 10 CONWWIR 11 CONWWIR 12 CONWWIR 13 CONWWIR 14 CONWWIR 15 1 DG413 IC4 2 DIN16MRA CON1 CON2 8 DIO 1N4148 01 D2 D3 D4 D5 D6 D7 D8 2 FET BF256A TR2 TR3 2 POTA2H50K 5 PUS204 53 54 55 56 57 2 RESM1 8 47R R104 R105 2 RESM1 8 100R R53 R54 4 RESM1 8 470R R12 R14 R24 R88 4 RESM1 8 1K R10 R30 R40 R82 13 RESM1 8 10K R18 R20 R21 R31 R32 R41 R42 R43 R55 R61 R86 R87 R92 6 RESM1 8 20K R17 R19 R23 R84 27 30 31 32 33 70 031 104 70 031 112 70 031 118 70 031 120 70 031 128 70 031 144 32 050 052 32 050 074 72 012 110 R85 R89 1 RESM1 8 22K R65 15 RESM1 8 47K R8 R15 R29 R39 R56 R57 R58 R59 R62 R63 R64 R81 R94 R99 2 RESM1 8 82K R13 R83 10 RESM1 8 100K R5 R6 R22 R36 R46 R60 R66 R90 R100 R101 6 RESM1 8 220K R9 R16 R25 R91 R93 R97 4 RESM1 8 1M 7 R11 R98 R103 4 TRM CRT4100K VR5 VR6 VR7 1 TRMCRT 220K VR10 1 ZEN 0 4AWH5V6 201 28 CONVERTER PARTS LIST ltem 1 2 3 4 Part Number Qnty CAD Part Ref 18 001 256 18 001 229 18 013 716 18 013 219 18 013 320 USE_STANDARD_WIRE 72 011 001 72 010 001 72 010 004 74 034 007 22 505 203 22 505 102 40 115 001 36 166 500 27 025 002 27 025 003 9 CCU
9. CONTENTS INTRODUCTION UNPACKING VISUAL INSPECTION SPECIFIC POINTS IMPORTANT SAFETY INSTRUCTIONS POWERING TECHNICAL SPECIFICATION EQUALISATION CURVES BLOCK DIAGRAM CONNECTOR PANEL CONNECTIONS INPUT MODULE OUTPUT MODULE ADJUSTMENTS AND CALIBRATIONS AD100 09 POWER SUPPLY UNIT CUSTOMER NOTES AND FACTORY MODIFICATIONS TECHNICAL LIBRARY eek 11 12 16 18 21 22 23 INTRODUCTION Unpacking If there are any signs of damage to the outside of the carton please notify us or your supplier immediately regardless of the unit s apparent physical condition This is in case a claim has to be made at a later date because of previously undetected transit damage The packaging material should not be discarded until the mixer has been acceptance tested and a suitable transit storage case is available for secure safe storage Visual Inspection Identification please make a separate note of the serial number for your own capital equipment records Ensure that it agrees with the number on the invoice packing note The serial number label is on the back cover adjacent to the battery compartment Temperature check the meter glasses for condensation If the package has been in transit during cold weather leave the mixer for at least 12 hours to allow it to return to normal room temperature Any measurements or subjective tests then made will be to a Known temperature reference Specific Points B
10. E LINE 77dB SNR 20Hz to 20kHz OdBu IN amp OUT HF 10dB O 10kHz LF 10dB 100Hz MF 15dB CENTRE FREQUENCY 2k5Hz Q 1 2 HPF PRE TRANSFORMER 12dB OCTAVE 3dB 150Hz 3dB 90Hz OUTPUT LIMITER THRESHOLD 8dB RATIO 7 1 ATTACK 4 05 RELEASE 250mS CURRENT CONSUMPTION 130mA 4 INPUT 12V DC SUPPLY TECHNICAL SPECIFICATION MECHANICAL SIZE ALL DIMENSIONS IN MILLIMETRES WEIGHT 2 3 Kg Excluding batteries EQUALISATION CURVES AD 114 HIGH AND LOW EQ LF BOOST LF CUT 8 0 HF BOOST HF CUT 10 100 1000 10000 100000 FREQUENCY AD 114 MID EQ AND HPF 10 100 1000 10000 100000 FREQUENCY BLOCK DIAGRAM 931 TASTA 300930 ONOW 10919 ONOW 1437 034315 110 421 SNTHOLIMS OL INO 1531 11 8 NI CONTROL PFL PFL LNANI 1 21 10 CONNECTOR PANEL
11. IOON Ref Designator C3 C5 C9 C13 C16 C21 C22 C23 C24 1 CCU 220P C6 3 CER100 63 C7 C8 C10 5 CER330 16 C2 C11 C12 C14 C15 5 CER470 25 C4 C17 C18 C19 C20 12 CONSWIR WIRE1 WIRE2 WIRES WIRE4 WIRES WIRE6 WIRE7 WIRE8 WIRE9 WIRE10 WIRE11 WIRE12 2 CONWWIR WIRE13 WIRE14 1 DIO 1N4001 D1 2 DIO 1N4148 D3 D4 3 DIO UF4002 D5 D6 D7 1 IC 4007 IC1 1 IND U0 2 220UH L1 IND U0 4 220UH L2 13 L4 1 LED 5MMZRED 1 01 1 MIS FS2 MIS FS2 1 1 MOL2PIN CON2 2 MOL3PIN CON1 CON3 29
12. adjust until the output signal falls to 8dBu This is the THRESHOLD setting If a different threshold setting is required alter the signal levels accordingly The DC voltage at PIN 10 of IC 2 should be approximately 0 6V different from that at PIN 14 The right output can be set using the above procedure but the preset and IC numbers change to correspond with the output being calibrated 19 The link function has no individual setting of its own To ensure this works within specification it is important that L and R outputs are set up as a pair After following the above procedure the DC voltages at PINS 14 and PINS 10 of the ICs should be identical Tolerance 0 1V with typical figures at PIN 10 of 2 6V and PIN 14 of 2 0V 20 POWER SUPPLY UNIT TYPE AD100 09 The AD100 09 mains POWER SUPPLY UNIT is suitable for driving most of AUDIO DEVELOPMENTS range of portable audio mixers This PSU is a single rail device providing 500mA of current at 14v DC potential and is used as a substitute for battery power with mixers containing an internal DC DC converter The AD100 09 may be powered from either a 110 120v AC source or a 220v 240v AC source Ensure that the AC Voltage Selector Switch on the front panel is in the correct position for the source in use Operating the equipment at the wrong voltage could be hazardous Care must be taken to connect the LIVE NEUTRAL and EARTH pins of the PSU s IEC mains connector to the correspo
13. attery compartment the mixer has an integral battery compartment to accept 6size AA cells and is built into the transversal extrusion DC DC converter is mounted on the right hand module Care must be taken when removing the module because some wire looms connect from the module to the base boards In order to facilitate the testing and calibration of all modules a set of two extender modules is available from the factory Connectors for convenience the connector panel is labelled for reading from above All connectors are in line with their corresponding module Fuse to protect the mixer and internal power supply is mounted on the power supply converter board Access is gained by removing the DC DC converter module A resettable polyfuse is fitted therefore maintenance should not normally be required The fuse resets after removal of the fault causing the overload Limiter threshold is set at the factory at 8dBu PPM 6 but an internal preset potentiometer allows adjustment to any other level above OdBu The limiters are to be found on the output module printed circuit board Microphone powering the mixer will remain unconditionally stable if the powering on unterminated input channels is switched off this also improves the noise performance and crosstalk Powering 48V phantom may be selected before or after the microphone is connected to the module Module fix screws Hexagon head screws are used to fix the modules a
14. crophone power before connecting a line level signal Phase change 4 is pre transformer and operates on microphone and line inputs y is the normal position The high pass filter is pre transformer and similarly operates on microphone and line inputs In this position the filter protects the transformer from low frequency saturation caused by wind traffic air conditioning etc Operating frequencies are to be found in the TECHNICAL SPECIFICATION high pass filter operates independently of the equaliser The input gain of the microphone amplifier is set by the 6 position switch 3 The range of this control is 50dB in 10dB steps For line level signals an input attenuator is inserted via switch 2 Following the microphone amplifier is the simple but effective equaliser as used in the AD245 selector switch 6 Amplitude controls are HF 11 MF 12 and LF 13 Two push button switches 7 routes the module s signal proportionately between the left and right mix busses Pre fader listen 8 with its LED indicator 9 routes the module s signal to the monitor PFL mix buss for auditioning on headphones An overload LED 10 illuminates before clipping at the input to the fader The Penny amp Giles fader 14 is calibrated at the fully open position Faders on adjacent modules can be coupled for stereo operation by the use of standard ganging clips Line input module The facilities incorporated in thi
15. es the risk of electric shock DANGER Incorrect connection of the equipment grounding earthing conductor can result in the risk of electric shock Where possible obtain a pre wired mains lead from a reputable supplier with the correctly fitted mains connector for the type of mains outlet in use otherwise one correctly wired and checked by a qualified electrical engineer If your mains lead is not suitable for the mains outlet have the correct plug fitted by qualified personnel The MAINS PLUG of this equipment is the primary disconnect device Therefore in the final application ensure it remains close to the equipment and easily accessible POWERING The mixer may be powered from either internal cells or an external DC power source The integral battery compartment requires a total of 6 size AA cells Access 15 gained via a captive lid which is retained by one 90 degree turn buckle The lid hinges outwards from the bottom panel When installing new cells please ensure they are inserted with the correct polarity rotation Either conventional dry or rechargeable nickel cadmium cells may be used However no recharge facility for ni cads exist within the mixer This must be carried out externally When driving the mixer from an external power source PIN 1 15 the connection and a voltage in the range 9V to 15V DC should be supplied to PIN 4 The power source should be capable of delivering approximately 400mA allowing some capacity
16. fter the output level control and limiters A pair of limiters may be switched in to the main output LIM 7 and linked for stereo operation LINK 6 LEDs 8 indicate when limiting is taking place The factory setting for onset of limiting is 8dBu at the main outputs Refer to Adjustments and Calibrations section of this manual if a different setting is required Line up tone when selected 5 replaces the normal signals on the main output Line up tone is calibrated on the BBC scaled meters to PPM4 giving a line output level of OdBu with the output faders set to maximum On a VU scaled meter the calibration is OVU giving a line output level of 4dBu The remaining controls are associated with headphone monitoring of signals from the mixer internal signals DIR or tape return RET maybe selected 14 these signals may be either in the L R domain or the M S domain When switches 14 15 and 16 remain unselected the main output signal from the mixer appears on the headphones If SW 15 is selected the left output signal appears on both earpieces if SW 16 is selected the right output signal appears on both earpieces If switched 15 16 are selected a matrix amplifier is inserted across the monitor output when the main output is in the L R domain the matrix will enable mono compatibility to be assessed on the left earpiece and out of phase components to be checked on the right earpiece When working entirely in the
17. nd back cover The size is 1 5mm HEX A F with a 2 5M thread If it becomes necessary to remove modules or back cover it is strongly advised using a good quality hexagonal head driver Use of a screwdriver however desperate is not recommended We wish you many trouble free hours of use from your mixer AS a company we are fully committed to BS EN ISO 9001 Should you have any problem or require any further information on mixers or the M S microphone technique please do not hesitate to contact us on 01543 375351 or by fax on 01543 361051 WARNING IMPORTANT SAFETY INSTRUCTIONS The user of electrical products must be familiar with their potential dangers and fundamental precautions must always be taken Please read the following text carefully Power supply units manufactured by Audio Developments Ltd are not user serviceable There are no user serviceable parts associated with any such power supply unit THE OUTER COVERS MUST NOT BE REMOVED Such a power supply unit is solely for use with audio mixers and sound processors hereafter called the equipment manufactured by Audio Developments Ltd Always use a cord set accepted by a National Approved Body EARTHING GROUNDING When using an external power supply unit that is connected to the mains supply to drive the mixer it must be CONNECTED TO EARTH In certain types of malfunction or breakdown earthing provides a path of least resistance for electric current and considerably reduc
18. nding terminals associated with the AC source The ON OFF switch contains an indicator that illuminates when the PSU is operational FOR SAFETY REASONS AD100 09 POWER SUPPLY UNIT MUST BE CONNECTED TO MAINS EARTH Any maintenance to the PSU or its mains cable assembly should be performed by a qualified engineer CHARGING I nickel cadmium cells are fitted in 0140 series mixer they may be recharged in situ from AD100 09 power supply whether the mixer is in use or not Maximum current is set at 250mA in addition to the 500mA of current supplying the audio electronics charging circuit has its own ON OFF slide switch and LED indicator DO NOT ACTIVATE THE CHARGE CIRCUIT UNLESS THE MIXER IS FITTED WITH NICKEL CADMIUM CELLS FUSES Two 20mm ANTI SURGE fuses protect AD100 09 against fault conditions Should either fail it is strongly recommended that the cause be traced Refer to the TECHNICAL LIBRARY Only suitably qualified personnel should service the power supply unit The fuse holder on the front panel contains the mains fuse 250mA HRC TYPE I 240v AC For continued safety the specified fuse link must be fitted in the mains fuse holder when a replacement is required Ensure it is of a type approved by a National Approved Body DC OUTPUT XLR PIN 1 Ov PIN 3 NOT CONNECTED PIN 2 CHARGE PIN 4 14vDC DO NOT REMOVE THE OUTER COVERS NOTE The power supply unit should be serviced by a suitably qualified engineer Only genui
19. ne spare parts with identical specification must be used is DANGEROUS to change the specification or modify the product in any way 21 CUSTOMER NOTES AND FACTORY MODIFICATION 22 TECHNICAL LIBRARY 23 MIC LINE PARTS LIST Item Part Number Qnty CAD Part Ref Ref Designator 1 74 130 001 1 AMP 064V IC2 2 74 120 010 1 AMP 393V IC5 3 74 920 001 1 AMP MIC AMP MIC 1 4 18 001 256 6 CAPCER100ND C35 C36 C37 C38 C39 C40 5 18 001 321 1 CAPCERU 47P C28 6 18 015 507 3 CAPELEC1 0G1 C3 C4 C25 7 18 015 411 2 CAPELEC4 7E1 C15 C16 8 18 013 022 1 CAPELEC102B1 C8 9 18 045 019 2 CAPPES470N H C2 C32 10 18 001 241 2 CCUF2N2 C43 C44 11 18 001 227 1 CCU 150P C21 12 18 010 808 1 CEA4 7 100 C27 13 18 010 114 1 CEA47 10 C41 14 18 010 217 2 CEA150 16 C24 C26 15 18 013 316 1 CER100 25 C5 16 18 013 219 4 CER330 16 C31 C34 17 1 CONSWIR 101 18 18 045 007 1 CPE4N7 63 C22 19 18 045 013 1 CPE47N 63 C20 20 18 045 108 1 CPES 6N8 C19 21 27 023 002 1 16 CON1 22 72 010 001 2 DIO 1N4148 01 02 23 22 505 102 2 IND U0 4 220U 11 12 24 40 115 001 2 LED 5MMZRED LED1 LED2 25 27 025 063 1 MOL3PIN CON2 26 72 022 001 1 PNP BC559B TR5 27 1 POTFAD2HVR4 FADER 28 3 POTMOL 50KLN NEI VR2 VR3 29 82 126 003 3 PUS204 57 58 59 30 70 031 036 2 RESM1 8433 13 R24 31 70 031 048 1 RESM1 8 100 R25 32 70 031 060 1 RESM1 8 330 R26 33 70 031 040 6 RESM1 8 47R R42 R46 R59 R60 R61 R64 34 70 031 056 1 RESM1 8 220R R6 35 70 031 073 1 RESM
20. ng at 6 Lower the output signal to 18dBu and adjust VR3 to obtain a meter reading at 18 Repeat this procedure to obtain an accurate reading at each of these three points Now check the calibration of all meter points SDR scale with a main output signal level of 6dBu adjust VR1 to obtain a reading of 12 Increase the output signal to 6dBu and use VR2 to obtain a reading of 0 the meter Lower the output signal to 18dBu and adjust VR3 to give a reading of 24 Repeat the procedure to obtain an accurate reading at each of these three points Now check the calibration of all meter points Main output limiters calibration involves two presets per output Using the L output as the example Biasing and threshold are adjusted as follows VR5 biases the limiter circuit to the point of correct operation and VR4 sets the threshold Labelled SET 0 and THR respectively With no signal present VR5 should be adjusted to give a reading in the range 1 5V to 2 5V at PIN 14 of IC 2 VR4 should be adjusted to give a reading in the range 2 5V to 3 5V at PIN 10 of IC2 Apply a signal at 1kHz to the mixer to give a level of OdBu at L output Then select the limiter function and adjust VR5 until the output signal starts to fall typically 0 2dB The DC voltage at PIN 14 of IC 2 should be approximately 2 0V After setting VR5 adjust the output signal to just greater than 8dBu with the limiter deselected Introduce the limiter and
21. s module are identical to that of the Microphone Line module except there is no microphone powering no microphone line select and input switched gain control The latter is replaced by a rotary potentiometer with a gain variation range of 6dB 15 OUTPUT MODULE Adin Developments xX e Qu 1 Meter 1 2 Meter 2 3 Slate 0 EEE 4 Internal microphone SATE 2 5 Line up tone bei C RET gt DEC ST 7 Output limiters um lg R 8 Limiter LEDs BEEN 9 Output fader 0 10 0 10 OUTPUT MONITOR 10 Battery Status 11 Meter Illumination 12 Microphone level 13 Return level control 14 Monitor return select Matrix 17 Monitor level control 15 Monitor left 16 Monitor right This module controls the level of main and monitor output signals and metering of the output signals Calibration is achieved when the stereo output level control 9 is at maximum The upper meter 1 reads left output the lower meter 2 right output Battery status is read on the upper meter by BATT 10 and the meters may be illuminated by ILL 11 overuse of this function will rapidly drain the batteries When the internal voltage drops below a safe operating level the battery status reading is at the lower limit of the BATT mark On a VU meter this is at OVU The main output signal is metered and monitored a
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