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ASC MINX Service Manual
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1. AUDID SYSTEMS COMPONENTS LTD LIMITER BATT TEST ENG PRES H PHONE LEVEL V SSS FRONT PANEL CONTROLS 1 Input Level Control A dual concentric pot arrangement feeding the mix bus where the back outer knob adjusts GAIN and the front inner knob acts as a FADER Level set by the GAIN control is progressively attenuated by the FADER control by adjusting FADER anti clockwise from the fully open clockwise position The FADER control therefore does not contribute any more gain i e does not have say 104 in hand 2 Pre Fade Listen PFL When selected as indicated by the orange iris allows monitoring of this and any other channel currently in PFL mode or engineer s 1 ENG headphones only FADER see Section 1 is not operative and channels with PFL selected do not contribute to mix bus or presenter s 2 PRES headphones Whenever PFL is selected for one or more channels the PPM meter automatically switches over to follow 3 High Pass or Rumble Filter When selected as indicated by orange iris imposes a 6dBper octave high pass filter on the channel Turnover point 1dB is 120 Hz 3dB point is 80 4 Headphone Monitoring Select Switches Hz Mounted above the PPM are presenter s PRES and engineer s ENG locking toggle switches for monitoring either mixer output O P or control line input CUE on their respective headp
2. N FORD CANFORD AUDIO PLC N CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 Ho b b ws technical data MINX MIXER SERVICE MANUAL Manufactured by Canford Audio plc Under licence from Audio Systems Components Ltd 02 405 Issue 2 02 03 CANFORD AUDIO PLC 4 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 Hoe b c technical data CONTENTS Introduction 3 Application Notes 3 Operating Instructions Front Panel Input Level 4 Pre fade listen PFL 4 High Pass Filter 4 Headphone Monitoring 4 Talkback Routing PTT 4 Limiter 5 Battery Check 5 PPM 5 Headphone level 5 Oscillator 5 Back Panel Input Selector 6 Control Line Input 6 Mixer Output 6 Output Attenuator 6 Battery Switch 6 IEC Mains Socket 6 Fuse Holder 7 Headphone sockets 7 Battery Compartment 7 Phantom Power module 7 Phantom Power obsolete version 8 Technical Specification 9 amp 10 Circuit Diagrams Schematic 11 Channel 1 12 Channel 2 13 Channel 3 14 Mix amp Limiter Output amp 15 Pre fade Listen 16 PPM Driver 17 Regulated Power Supply 18 Sub Board 19 12 volt T power 20 Notes 21 02 405 Issue 2 02 03 2 j NFORD CANFORD AUDIO PLC A 4 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 Ho b eomme technical data INTRODUCTION Thank you for choosing the Minx mini mixer A lot of care and attention
3. Directly left of the headphone level controls is the oscillator on off toggle switch When switched downwards ON the oscillator generates a 1 KHz tone at OdBu which is routed to the mixer output This can prove useful in patching in the Minx ata radio station when it is being used at a remote location The oscillator is also essential for setting correct level line ups NOTE The oscillator circuit employed uses a thermistor which will initially overshoot before settling back to OdBu If following equipment is sensitive to overshoot turn LIMITER on before using oscillator 02 405 Issue 2 02 03 5 4 CANFORD AUDIO PLC CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK w E p admin 0191 418 1000 e 1122 technical data r 50dBm CHARGE MAINS 240 VAC FUSE 1280 BACK PANEL 11 Input Selector Mic Line When pushed in as indicated by orange iris pads input to accept line level signals 12 Control Line Input Cue Accepts line level signals for monitoring by presenter or engineer s headphones see 4 Connection may be by pin XLR type connector or bare wires as in temporary phone circuits 13 Mixer Output Output Normally line level output but see 14 XLR connector has low source impedance for driving good quality music circuits bare wire terminals have 600 ohm source impedance for e g temporary phone circuits 14 Output Attenuator 50dbm Makes m
4. su L VEM 3121 us aN q D ial 5 nm Angpa LAS Wold MZ LIA Ingna Q OL AVAA ils Deeds id IELO Re AYLI LH 2 gt AYE 1 LAT FI oM 1 a0 i b PIPN I iA 2 L E t 7 u z n 17 02 405 Issue 2 02 03 CANFORD AUDIO PLC 4 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 b technical data Regulated Power Supply n 3 A a lt lt l gt f f L E m pame T of EM 2 7 es 5 Je CN E 3 5 zon J E gt T PNE om Z lt L 1 Pa _ x ki z af 55 5 SE u x a E 2 E E i sz fh gt A 4 d 3 A 3 asi 3 A 5 2 4 4l 4 4l c al allg gt S ex sm e8 zz g ne TA ui SE gt gt u tu E U lt ll Li Pt e Se ez 3 z a 4 E Z 2 AA 1 2 E x A
5. Channel 2 Sul jaeuunzec HOVIS LOYAL KNIN pay i 8 AST APT Wel COOOL Cri LO 121 UNV NA ACE TRY AST FOOT 2 FMS Vel g TIN m 3 t z DIN ri JACLLNVHc A57 02 405 Issue 2 02 03 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 sales 0191 418 1122 fax 0191 418 1001 CANFORD AUDIO PLC CANFORD technical data gt Mic Line Input Stage Channel 3 1 Mr Fe ZOO X V AKIOLTIE FAL ANWTONT ENVIO NIVO UOT ALE ENVIO YJ4VJ LAY Lee LLANA AGL unzz TON IL Lll SMS r NVH J OIUT V A9T FNAT i NVU LXI LQ TIN JALEN TOC MS UND OLA 14 02 405 Issue 2 02 03 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 sales 0191 418 1122 fax 0191 418 1001 CANFORD AUDIO PLC CANFORD technical data gt Mix Amp Limiter Output 1 T II p ESE S
6. has gone into the design and build of this product and we hope that it will serve you well Like any technology product the only way to get the best from it is to thoroughly read and understand the manual Should you find any aspect of this product and its related documentation ambiguous or confusing please let us know Additionally should you perceive ways in which the Minx could be improved we would welcome your comments APPLICATION NOTES The Minx was designed to be for 2 man operation nominally presenter DJ and engineer The presenter need not necessarily be next to the engineer as talkback exists from engineer to presenter also the engineer presenter can talk back two way with base on the CUE line Typical uses are Sports Events Mics for presenter actuality and guest Town Hall Expanding existing mic positions at debates etc Live OBs Less than 61b in weight and battery powered the Minx can feed radio links remote pickup or radio mics at mic level These are just typical uses The Minx is so compact and versatile yet with such good quality specs it can be used as a sub mixer at concerts feed ENG cameras VCRs or for local work 02 405 Issue 2 02 03 3 CANFORD AUDIO PLC CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 sales 0191 418 1122 fax 0191 418 1001 CANFORD Heo gt gt technical data FADER ES GAIN FADER GAIN gis FADER E GAIN gt
7. Depth 193 mm 7 6 Height 66 mm 2 6 02 405 Issue 2 02 03 10 CANFORD AUDIO PLC Fa 4 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 Ho b technical data Schematic Breakdown LAN 0732 AIGA 1 02 405 Issue 2 02 03 11 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 sales 0191 418 1122 fax 0191 418 1001 CANFORD AUDIO PLC CANFORD technical data gt gt Mic Line Input Stage Channel 1 R azy 1 99715 AINT XNTIN ETROTA FI ELM XK WA TAKITTR ELO TT NV DNI NvH2 EIL V AYA vet ASL TICE NVIEY SAV OLIV Id 14 ANIL 14 t NV112 Lid ASt ASE JNM PI maru AL ALY AOL LIINI INT OLA A LINVHd A47 12 02 405 Issue 2 02 03 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 sales 0191 418 1122 fax 0191 418 1001 CANFORD AUDIO PLC CANFORD technical data gt Mic Line Input Stage
8. E E 2 5 i 14 n x 02 405 Issue 2 02 03 18 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 sales 0191 418 1122 CANFORD AUDIO PLC fax 0191 418 1001 CANFORD technical data gt gt Sub Board M AIS iauna 2714 UM VOT XNIA LISLE AAD X V Ls Zt FL NIV TNYTONH L SOH HOL napn 1S HAT SS ud Mie Thy SH 1 iN AMT SSO OLV UOS iN AST DMY NIVO SEDET V 14 YHA LINL ASI NOLF JIN 5 eu 1 19 02 405 Issue 2 02 03 CANFORD AUDIO PLC Fa 4 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 Ho b technical data 12 volt T Power E A Lt x E G g oom F 1 EZ x a lt lt 9 Bo z 5 gt 8 9 7 z A u x E E E HC 5 n 4 2 z lt amp x Ez gt Ez gt 2 zt z EC B x Cu zu l
9. I y HS 100 vw AZM urin 226 HOVIS BULL ETEDIS X Vd XKIOTIS PLZ ISL INVYNH h CIN EAS VILNI SA c LIS 1 Se 21 HPIPNI o P E TES BV LUNI us 19x ASE Ik or Let I0 AA UAL AST OCC TA XTW TAT AGL nec a 1 15 02 405 Issue 2 02 03 tito PELO XVI ULL FAL technical data CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 sales 0191 418 1122 fax 0191 418 1001 CANFORD AUDIO PLC gt gt CANFORD E ASL PRU VA SSL T IVA IA LON OHV Wikel CEP VNT TAI TGA AJL mel AML 16 lt Si XIN Pre Fade Listen ALIALA OL N IVA 02 405 Issue 2 02 03 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 sales 0191 418 1122 fax 0191 418 1001 CANFORD AUDIO PLC CANFORD technical data gt gt PPM Driver n TT Wri CPE LO PROLLY Lbr 13 Al
10. chargeable factory retrofit 12 Volt Powering Optional Models AT and BT Derived from PP3 batteries or AC supply connected to microphone when locking toggle switches are selected in DOWN position NOTE If Mic Line switch is in line position ensure that corresponding Power toggle switch is in the OFF up position When using Dynamic microphones ensure that corresponding T power toggle switch is in the OFF position otherwise damage to the microphone may result WARNING Do not use 12 Volt T Powering with 48 Volt Phantom power microphones or Dynamic mics Do not use 48 Volt Phantom powering with 12 Volt T Power microphones or Dynamic microphones 02 405 Issue 2 02 03 8 CANFORD AUDIO PLC CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 sales 0191 418 1122 fax 0191 418 1001 CANFORD He gt gt technical data TECHNICAL SPECIFICATION Inputs Noise Referred to Input Measurement Method Mic Line Output Noise 22Hz to 22KHz RMS 121 1dB 79 7dB 75 0dB A weighted RMS 124 7dB 82 3dB 78 1dB CCIR weighted RMS 117 9dB 73 4dB 69 0dB CCIR weighted quasi peak 112 1dB 69 3dB 65 1dB CCIR ARM ref 2kHz 122 8dB 80 0dB 75 7dB Harmonic Distortion Impedance Both transfer bal Sensitivity Fader fully open Headroom at Inputs Fader fully open Amplitude frequency response w r t IKHz Hi pass filter Wiring Conventions XLR Type conn
11. ectors RCA Phono connectors 1 4 Jacks connectors Bare wire terminals 02 405 Issue 2 02 03 0 196 at 1KHz Mic gt 1K ohm floating Line gt 10K ohm bridging 70dBm to 40dBm Mic 20dBm to 10dBm Line Mic better than 30dB Line better than 20dB 40Hz 15KHz 1 0dB 125Hz 10KHz 0 5dB 3dB at 80Hz Slope 6dB octave Pin Ground Pin 2 ve Phase or Hot Pin ve Phase Cold Tip Phase or Hot Ring ve Phase or Cold Tip Phase or Hot Ring ve Phase or Cold Sleeve Ground Red Phase or Hot Black ve Phase or Cold CANFORD AUDIO PLC 4 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 b technical data TECHNICAL SPECIFICATION cont d Outputs All transformer balanced 1st Output Impedance 75 ohm 10 floating or 50dBm 200 ohm Connector Locking 3 pin XLR 2nd Output Impedance 600 ohm 10 floating Connector bare wire terminal Each output is fed from separate secondary in output distribution transformer which provides DC isolation Both the line output and cue line input transformers incorporate an interwinding screen and are flash tested at 1 Kv primary to secondary Cue or Talkback Control Impedance 600 ohm floating transformer balanced Connector Locking 3 pin XLR and barewire terminal in parallel Weight 1 85Kg Dimensions Width 223 mm 8 8
12. hones For engineer only monitoring will be overridden by PFL if selected 5 Talkback Routing PTT Associated with the electret talkback microphone 5a this centre biased momentary toggle switch directs the output of the talkback mic amp either to the control line CUE when pushed to the left i e towards PRES monitor select toggle or to the mixer output O P when pushed to the right Thus the engineer can talk to the presenter even during a live programme by selecting CUE on presenter s headphones and holding the PTT toggle to the left 02 405 Issue 2 02 03 4 CANFORD AUDIO PLC CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK a E p admin 0191 418 1000 e sic 1122 technical data FRONT PANEL CONTROLS cont d 6 Limiter When selected as indicated by orange iris limits output at 8dBm factory set Operation indicated by the led fitted into the PPM attack and release program controlled 7 Battery Check Batt Test Push to read battery condition on the PPM Replace recharge batteries when level reads lower than 5 on the PPM scale Scale reads between 6 7 with new batteries 8 Peak Program Meter PPM Scale 420dBu 6 8dBu Movement and electronics to BS4297 9 Headphone Level Cans A dual concentric pot arrangement where the back outer knob adjusts presenter s 2 PRES headphone level and the front inner knob adjusts engineer s I1ENG headphone level independently 10 Oscillator OSC
13. ixer output mic level and changes source impedance to 200 ohms typical mic impedance 15 Battery Switch On Off Charge Locking toggle switch In the ON up position switches the mixer on under battery power in the OFF CHARGE position switches mixer off under battery power but enables Ni Cad charging circuits see 16 16 IEC Mains Socket Integral Fuse Holder Regardless of battery switch position see 15 application of mains power via this socket always powers the mixer With reference to 15 above if ON position selected and mains power is lost the mixer will fail to battery operation If OFF CHARGE position selected the mixer is mains powered and the Ni Cads are being charged 02 405 Issue 2 02 03 6 CANFORD AUDIO PLC 4 CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 b ome technical data DO NOT OPERATE THE MINX FROM MAINS POWER WITH ORDINARY DRY CELLS AND OFF CHARGE POSITION SELECTED 17 Fuse Holder A pull out drawer beneath the mains plug entry contains the 250mA 20mm fuse and a spare 18 Headphones Cans 1 ENG 2 PRES Jack sockets for engineer and presenter s headphones Models AP and AT use A gauge tip ring sleeve 6 35 mm stereo jack Models BP and BT use B gauge tip ring sleeve 6 35 mm stereo jack having the small tip 19 Battery Compartment Underneath the Minx you will find the battery compartment Here there is room for 2 x PP3 batteries and the phantom power m
14. no extra current is drawn from the regular pair of batteries under any operating conditions Regular Batt Mains The Phantom Power is generated from the Mains Supply or the regular pair of batteries if the mains is removed The life of one the regular PP3 batteries is reduced in the worst case this reduction is to approximately half of the battery life with an independent Phantom Power Battery Whichever battery is being used for Phantom Power there is always some current drain due to the Phantom Power supply unless Off Charge is selected and or Phantom Disable is selected The drain on this battery then depends on the number and type of microphones in use Phantom Power obsolete version using 22 5 volt camera batteries Derived from 2 x B122 22 5 Volt batteries only they are housed in the battery compartment Consumption is approximately 2 3mA per microphone being powered Approximate battery life is 8 hours NOTE The Minx has no provision for recharging the Phantom power batteries once expired they must be replaced Batteries must be fitted if phantom power is required when using the Minx on AC If the Minx is not being used ensure that Phantom power mics are either unplugged from the mixer or the Mic Line switch is set to LINE When using Dynamic mics ensure that both B122 batteries are removed from the battery compartment B122 batteries are no longer available Addition of the Phantom Power Module to existing Minx Mixers is a
15. odule If the phantom power module is not fitted there is space for two spare PP3 batteries Take care to insulate battery connectors on spares Phantom Power Module Only models AP 93 931 and BP 93 938 have the 48 volt Phantom Power option Phantom Power is applied to all of the microphone inputs The Phantom Power facility is controlled by a 3 position switch on the Phantom Module PCB contained in the battery compartment of the mixer There is a label on the battery compartment lid which indicates the switch settings The switch positions are Phantom Power Batt Disable Regular Batt Mains Phantom Power Batt The Phantom Power is generated from the single PP3 battery next to the Phantom Module PCB Use of phantom power does not then affect the life of the regular pair of batteries but current 15 always drawn from the separate Phantom Power Battery even on mains operation When the On Off Charge switch is in the Off position there is no drain from the Phantom Power Battery There is no provision for charging the Phantom Power Battery on mains operation and no requirement to remove this battery on mains operation in the Off Charge position 02 405 Issue 2 02 03 NFORD CANFORD AUDIO PLC CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 e p sales 0191 418 1122 rei technical data Disable The Phantom supply is disabled No current is drawn from the Phantom Power Battery and
16. t x 2c E D a a l gt 5 5 5 BE 2 5 25 ac gt e i gt 3 02 405 Issue 2 02 03 20 CANFORD AUDIO PLC NFORD CROWTHER ROAD WASHINGTON TYNE amp WEAR NE38 OBW UK admin 0191 418 1000 sales 0191418 1122 b s technical data NOTES 02 405 Issue 2 02 03 21
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