AMIS60/120 Series Service Manual Product Description Set
Contents
1. for 70v line speaker loads use with common Please ensure that the correct Common is used Low impedance and 25 70v loads can be used simultaneously but please pay careful attention to the overall speaker load Note The minimum impedance or maximum load at 70 volt line should be no less than 40 Ohms for the 120 and no less than 80 Ohms for the AMIS60 Terminal Strip The remaining terminals read as Spare Tone Generator Common use with one of the 4 tones listed below Pre Announce Chime Alert Tone Bell Chime Evacuation Tone 24 volt DC Vox Relay Out VCA 600 Ohm Telephone Input 115V version Switched Speaker System Speaker Zone Output Terminal Strip Reading from left to right these screw terminal pairs correspond to the switched line voltage outputs and are numbered 6 through as indicated on the front panel of the amplifier For each pair the left hand terminal is the line voltage output and the right hand terminal is the common All Call Button When pressed the All Call button will connect the line voltage output of the amplifier to all 6 of the switched outputs Speaker Zone Selector Switches These 6 black buttons are for switching the line voltage output of the amplifier to any combination of the 6 available speaker zones The maximum capacity of each speaker zone is 60 watts so care should be taken to ensure that no individual zone is loaded down with any more than 60 watts always2. 4 7 1 1k 47k 10 47 D 100 22k 47k 10k 100R 1k OR BC546 546 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor HW ER 11 2W Metal film resistor KEE EE 11 2W Metal film resistor Eds rS 1 2W Metal film resistor reum ida m pr 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor 10k Cermet potentiometer 1 2W Metal film resistor ebe 1 2W Metal film resistor 1 2W Metal film resistor SSH Resistor pack 1K onms 0 Resistor pack 1K ohms Resistor pack 1K ohms Resistor pack 1K ohms 1 2W Metal film resistor o es Resistor pack 1K ohms eo 1 2W Metal film resistor dipwdeda medsp 7 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor EE EE 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor SAT Relay 1P e o AM Transistor 92 Transistor 92 9111590682 9111590105 9111590102 9111590393 9111590103 9111590222 9111590102 9111590472 R55 10k 1 2W Metal film resistor 9111590103 9111590102 9111590102 9111590473
3. 4u7 Electrolytic 35V 4u7 NP Non Polar Electrolytic 50V 4u7 NP Non Polar Electrolytic 50V Non Polar 4u7 Electrolytic 35V Non Polar eo 4u7 Electrolytic 35V EE Non Polar 4u7 NP Non Polar Electrolytic 50V Non Polar econ V 4u7 Electrolytic 35V 407 Electrolytic 35V 1 a Metalised Poly 407 Electrolytic 35V 100P Multi Layer Ceramic 100V 4 7 Electrolytic 35V LM1458 Dual op amp DIP 8 Pin Tides emp DIP LM1458 Dual op amp DIP 8 Pin 2152810458 1458 Giel et am DPs 2152810458 LM1458 Dual op amp DIP 8 Pin 2152810458 LMi458 Dual op amp DES Ee 2452810458 2127181101 2121230479 2152810458 RCA RCA RCA Socket RCA Socket 2581420102 2581420102 R1 680R 1 2watt Metal film resistor 9111590681 MEUS 100 1 2watt Metal film resistor 9111590104 Metal fim resistor 9411590223 680R 1 2watt Metal film resistor 9111590681 716809 1 dwatt Metal film resistor 9111590681 680R 1 2watt Metal film resistor 9111590681 22 1 R17 100K 1 2watt Metal film resistor 9111590104 R 39K Metal fim resistor 9111590223 R19 22K 1 2watt Metal film resistor 9111590223 uu 1 21 680 1 2watt Metal film resistor 9111590681 R22 680R 1 2watt Metal film resistor
4. 9111590103 9111590103 9111590000 9111590473 9111590103 2111886102 2111886102 2111886102 9111590103 2111886102 9111590104 9111590223 9111590473 9111590103 9111590101 9111590102 9111590000 ATTE gt cec 1 2144200546 2144200546 AMIS120 Input Component List Designator Part Type Description Part number qo NR cured EE XLR connector female 2587210266 XLR XLR connector female 2587210266 XLR XLR connector female 2587210266 RCA 2581420102 RCA 2581420102 RCA RCA RCA Socket RCA Socket RCA Socket RCA Socket 2581420102 2581420102 o RCA Socket RCA RCA Socket 2581420102 4u7 NP Non Polar Electrolytic 50V 4u7 NP Non Polar Electrolytic 50V Non Polar gt 417 Electrolytic 35V Non Polar 4u7 NP Non Polar Electrolytic 50V 2120250479 2120250479 2120250479 2121230479 2120250479 2120250479 2120250479 2121230479 2127181101 555181101 2121230479 2121230479 2120250479 2120250479 55150550198 2121230479 5554550476 2121230479 5550550478 2120250479 neues 2121230479 5151550476 2121230479 BE 2124282101 2121230479 Non Polar 417 Electrolytic 35V Muli Layer Coram Ee 100P Multi Layer Ceramic 100V 90 100 417 Electrolytic 35V Too Layer Ceramic 700
5. IC2 7815 LKI OR C39 C3 C2 In ce 470u 470u CRT es T 407 9X 10K VDD R72 1 8 UNS R9 R73 220R ATE R10 ICH 470R 7805 o ___ met 10 5120 60 MIXER Size Number 63 0 0 Revision CD 1 7 Date 6 Feb 2003 Sheet of 1 1 File C3AMIS60 120 ManualCD6300 1 DDB Drawn C 2 3 4 6 7 8 R31 100K X1 1 R3 CI VCC 100K 447 NP G 1 2 VCC RI v 680R 4u7 R2 C3 680R 4u7 e R29 R30 ihe 47 4k7 C6 100P RX d 600 6000hm 100K TELEPHONE INPUT E e MIX OUT 2 R9 d 22K gt R3 027 407 D ca R36 OUTPUT 47K 1 L R37 10R LM1458 aig far 834 C30 S 417 1458 3 gt R40 E 3E Cc 100K 4u7 T 22K R17 C14 CT 100K 407 R42 2 10R aR 1 DI RIS CIS PHANTOM 6808 4017 CI6 XIR3 4u7 Y R16 24 nl 680R 407 gt C gt R23 4K7 C32 Title AMIS120 60 MIC INPUT Size Number Revision CD6235 1 re Date 6 Feb 2003 Sheet File 560 120 Manual CD6235 1 D
6. LK2 R1 10K em R13 4 7 R15 4 7 100k 1K RIS US R20 15k R24 10k 50K 50K R28 50K 10K 10k R31 100k R33 TOOR R35 10K Dual op amp DIP 8 pin Regulator 92 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor aI 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor _1 2W Metal film resistor Potentiometer 50KB Potentiometer 50KB Potentiometer 50KB Potentiometer 50 n e e 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor 1 2W Metal film resistor a E Mem ERR R40 50K Potentiometer 50 Potentiometer 50KB e e SP Ede oN T PE 1 2W Metal film resistor 2152810458 2153850222 2151370805 9111590000 9111590000 9111590103 9111590105 9111590472 9111590473 9111590104 9111590102 9111590102 9111590153 9111590103 2021000503 2021000503 2021000503 9111590103 9111590103 9111590104 9111590101 9111590103 9111590222 2021000503 2021000503 R44 R46 e R56 R57 R58 R59 R6 R60 R62 ges ees 6K8 1M iK 39k 10k 2k2 1k
7. 9111590681 R23 4K7 1 2watt Metal film resistor 9111590472 24 ia 1 2watt Metal film resistor 9111590472 R25 4K7 1 2watt Metal film resistor 9111590472 R26 4K7 1 2watt Metal film resistor 9111590472 fog pe 21 R28 OR 1 2watt Metal film resistor 9111590000 24 R3 100K 1 2watt Metal film resistor 9111590104 ae uM C MM R31 10K 1 2watt Metal film resistor 9111590103 p a P po ar E ee ee 1K 1 2watt Metal film resistor 9111590102 1K 1 2watt Metal film resistor 9111590102 R35 47K 1 2watt Metal film resistor 9111590473 R37 10R 1 2watt Metal film resistor 9111590100 77 R40 100K 1 2watt Metal film resistor 9111590104 24 10R 1 2watt Metal film resistor 9111590100 22K 1 2watt Metal film resistor 9111590223 22K 1 2watt Metal film resistor 9111590223 n eru cM ia 1 2watt Metal film resistor 9111590472 22K 1 2watt Metal film resistor 9111590223 100K 1 2watt Metal film resistor 9111590104 Optional USC T XLR connector male 2587110227 AMIS120 60 Parts price list _ Manufacturer code house AUD Batt eee 120 Mixer 120 Input pcb Description Mixer PCB Input PCB 120 Output PCB Output PCB LED 60 Mixer 60 Input pcb Display PCB Mixer PCB Input PCB 55728 15120516 55728 15120517 55728 15120518 55728 15120519 55728 1560516 55728 1560517 55728 1560
8. Disc Ceramic 2127280336 30 21494082190 1200P Multilayer Disc Ceramic 2127181122 i ERES EE EE Electrolytic 35V 2121230479 202 Electrolytic 63V 2121260229 2u2 Electrolytic 63V 2121260229 4u7 Electrolytic 35V 2121230479 a C Electrolytic 35V 2121230479 SST E EE Multilayer Disc Ceramic 2127181220 EE 77 Metallised Poly 100V 2124262472 aio ne Electrolytic 35V 2121220100 a Electrolytic 35V 2121230471 os ee 417 Electrolytic 35V 2121230479 220p Multilayer Disc Ceramic 2127181221 BAV21 Signal Diode 2133400201 1N4004 Rectifier Diode 1 400V 2133440004 CIO an a 7177777 BAV21 Signal Diode 2133400201 SE EE Signal Diode 2133400201 EE Signal Diode 2133400201 IC10A LM358a IC10B LM358b IC11A LM1458 LM1458 1458 7815 IC3B LM1458 IC5B LM358 Dual op amp DIP 8 pin Dual op amp DIP 8 pin op amp DIP 8 pin ______ Dual op amp DIP 8 pin Dual op amp DIP 8 pin Dual op amp DIP 8 a e Regulator 220 E Dual DIP 8 pin ________ op amp DIP 8 pin VCA 2152800358 2152800358 2152810458 2152810458 2152810458 2151370818 2152810458 2152800358 LM1458 Dual op amp 8 2152810458 IC7B LM1458 IC8 M5222 IC9 7805 LK1 OR
9. earth pin 2 signal hot pin 3 signal cold Phantom power of 15 volts 15 available on all microphone inputs Reading from left to right across the rear panel the inputs are 4 3 2 amp 1 Line Inputs four inputs are dual mic line with line auxiliary inputs being via dual RCA connectors channel Line inputs 1 2 amp 3 have an input sensitivity of 150mV 100K ohms Input 4 has an input sensitivity of 300mV 220K ohms making it suitable for high level inputs such as CD player Reading from left to right across the rear panel the inputs are 4 3 2 amp 1 600 Ohm Telephone Input 115V version The 600 ohm transformer balanced Telephone Input is summed with input 2 through 100k ohms The input sensitivity is 150mV driving the amp to full power Insert Point The Insert Point is located electronically after the master volume pot and before the balancing circuit for the power amp and line output The Insert Point is a 3 conductor Tip Ring Sleeve phone socket which accepts a standard stereo 6 35mm 1 47 jack The connections Tip Amplifier in Ring Output Sleeve Ground The switched contacts are used to break the signal internally When an external processor is used via the insert point it only affects the power amplifier section and line output of the AMIS60 amp AMIS120 The tape output remains unprocessed VOX Relay Output The terminal strip to the immediate right of the A
10. remembering that the total load for the AMIS60 is 60 watts and for the AMIS120 120 watts in total Eg it is possible on the AMIS120 to safely have one zone loaded with 60 watts and the remaining five loaded with 12 watts each All switches are latching and non interlocking Phantom Power Button This button enables or disables the 15 volts DC phantom power to all microphone XLRs Do not plug an unbalanced microphone in to any amplifier or mixer when phantom power is switched on The phantom voltage is connected through 4k7 1 4W resistors The maximum current draw available per microphone is approximately 3mA Line Output The balanced XLR line level output provides a maximum of 700mV to allow for the connection of up to 6 power amplifiers Pin connections are pin l earth pin 2 signal hot pin 3 signal cold The output is electronically balanced with an inverting op amp and buffered with voltage follower op amps Neither hot nor cold output should be grounded when connecting as unbalanced Tape Output Dual RCA output connectors provide a line level output with a maximum of 350mV into 10k Ohms This output is sourced before the master gain control so the tape output level is not influenced by the operation of the master gain control Microphone Inputs All four inputs are dual mic line with microphone inputs being via a 3 pin XLR connector per channel The mic input sensitivity is 1mV 200 ohms Pin connections are l
11. 4 15 3 Set all Channel Pots at the minimum fully counter clockwise position 15 4 Increase the level on the channel that has the program source connected and listen for audible problems 15 5Check Priority function 1 over 3 amp 4 CH 2 over CH 3 amp 4 by connecting a Microphone to Channel 1 An audio signal presented to the microphone should cause the CD player to mute Check generated tones With a jump wire short one of the tone connections to the tone common connector rear panel and check to ensure that the tone selected activates N m FROM MIXER PCB BP C3 4u7 17 330 v yvy 2 DI 21 Ik R44 1K 9 C6 470n C4 C18 330P IC1B LM1458 BP RI PW VI OR22 R2 OR22 PW5 V2 36C TIP36C 05 134004 lt ET OUTPUT R46 AK7 TR V5 TIP36C TEMP CUTOUT gt D6 1N4004 35VDC 14 640 R40 eee te 15R 2W we eg PRE VCC R31 IC2 10R LM7818 CXI 22n 400V GNDCH Title AMI POWER AMP POWER GND 100n Si Numbi Revisi POWER
12. 518 60 Output PCB Output PCB LED Display PCB 55728 5120519 Transformers AMIS120 AMIS60 AMIS120 AMIS60 222 5728 120 504 5728 60 504 5728MAN120PS22 55728 60 522 Mains 230 240 Mains 230 240V Output Output Semiconductors TIP36C TIP42C BC639 BC640 BD140 BD139 LM1458 LM833N LM358 LM78L05 LM7815 LM7818 PIC16C54 XTP LM5222 10k Thermistor Switches amp Pots Volume Pot Power switch PNP transistor PNP T0220 transistor NPN TO92 PNP TO92 PNP TO92 NPN TO92 IC Dual Op amp IC Dual Op amp IC Dual Op amp Regulator IC Regulator IC Regulator Program IC IC VCA channel amp master Round rocker switch 2141600036 TIP36C 2141300042 TIP42C 2144200639 57007 2144200640 57008 2141400140 2141400139 57009 2152801048 LM1458 2157800833 1 833 2152800358 1 358 2151270805 LM7805 2151370815 1 7815 2151370818 LM7818 2159601654 120 2153850222 2111911103 2021000503 2511213112 3 60 2 01 0 16 0 16 0 22 0 22 0 27 1 05 1 05 0 17 0 52 0 52 4 17 1 56 0 80 Hardwar Front Panel 120 _____________ Front Panel 60 Screw Black screw wo star volume amp master 12 way terminal S600000136 93 69 5600000139 Sa M 600000133 _ 2587210266 1 34 2587110227 Screw washer Doch screw 2316420308 9346110015
13. AMIGO AMIS60 120 Series Service Manual Product Description Set Up Test Procedures Component Lists Full Schematics PCB Overlays Australian Monitor Private Bag 149 Silverwater NSW 1811 Australia www australianmonitor com au AMIS60 120 Product Description The AMIS60 and AMIS120 mixer amplifiers are designed for commercial installations Both models operate on 230 240 VAC 50Hz 240V version 115VAC 60Hz 115V version or 24 VDC and may be desk or rack mounted rack mount kit supplied fitted Both amplifiers incorporate a 6 zone 100 volt line speaker zone selector with All Call The AMIS60 will deliver 60 watts into a load of 8 ohms 70 volt or 100 volt line The AMIS120 will deliver 120 watts into a load of 4 or 8 ohms 70 volt or 100 volt line 240V version 70 volt or 25 volt line 115V version Both Models feature 4 universal mic line inputs and an insert point for additional EQ or feedback exterminator if required The AMIS60 120 also feature a dual RCA tape output while a balanced 700mV XLR output is also provided to feed up to six power amplifiers Other standard features include on board Bell Pre Announce Alert amp Evac tones Remote Master VCA Control amp dual stage priority muting As standard both models are self standing and come with rubber feet They may be stacked to a maximum of four units high The 115V version also has a transformer balanced 600 ohm telephone input 115V version AC Power Inl
14. C inlet features a relay output This relay is deactivated when signal becomes present at any of the priority inputs This would normally be inputs 1 and 2 however these channels can be removed from the priority bus via internal links The unit is shipped from the factory with inputs 1 and 2 having priority The emergency tones also deactivate the relay The relay can also be removed from the priority bus allowing muting to occur without operation of the relay The relay outputs are C Common NO Normally Open and NC Normally Closed The NO or NC selection provides the installer with the option of the relay either opening or closing a contact This feature is normally used in conjunction with relay override attenuators volume controls In this application the relay output could trigger an accessory power supply which in turn bypasses the remote attenuators The result is that priority inputs will always be heard irrespective of the attenuator setting The relay contacts are 3 amps at 125VAC 30VDC The relay outputs are marked in the fail safe position i e power off When power is applied and no signal is present the relay energizes through transistor BC546 This transistor is turned on by 5 LM358 or equivalent This output is normally high Switch on and switch off times are controlled by the time constants of the RC network of C21 and R77 The switch off time is determined by the current sinking capabilities of the LM358 through d
15. DB Drawn RS 3 4 5 6 7 8 13 OUTPUT 4 83607 TRANSFORMER OUTPUT GND CT R4R7 R5 R6 R20 R15 R18 12 1 PA um d R9 fei R19 7 ot SE C4 014 R37 Hie SEH T R44R2 R24 R23 03 R3 GND BAT vol PR Australian Monitor POWER TRANSFORMER R45R46 INSTALLATION SERIES GND CT 24VAC INPUT 9 5 R21 R22 50 e um I3 B P i 8 5 89 LNK C4g 5 2 INK 932206 R44 T 56022 e Epapl SS ly Gp mesma _ nouis 5 AE 1213 6300 E C13 mm cas 036 DI Ic E 1C4 t Al c12 E all 165 R82 og OS Z 2812 c11 N 5 Sg Oy ub o 1C3 8 LJ Ce R29R30R8 823824 Id aid ko R45 esi
16. GND ar CD 62 8 9 2 Date 5 Feb 2003 Sheet of 2 2 File 60 120 Manual CD6289 22 DDB Drawn RS 1 2 3 5 6 7 8 R6 10K 1 6 7 8 VCC 1 2 R80 35 100R Re R33 R31 100R R82 C7 C28 220 031 Lie POWER AMP R34 R38 R35 D 10K 50K 10K 458 CH1 R36 LM1458 10K CH2 Ta d 3 POWER 1200 29 Li 5 R52 R42 OR R18 6K8 2 2 Sn 1 gt R79 LINE OUT R45 10k Cll C35 22k 33p 2 C31 417 AGND R40 E WS a vec a 1458 wa 201 C19 R48 10k n 2u2 1 10 6 R64 AGND 10k 1 v2 R14 35VDC R58 546 3K3 47 R54 1 GT AG 1 2VCC ik ag L 24 dS 6 15 x GNDA 447 mel C12 47 vcc
17. Mains AMIS60 230 VAC 2 Amperes Slow Blow Mains AMIS120 230 VAC 3 15 Amperes Slow Blow 115V version Mains AMIS60 115 VAC 3 15 Amperes Slow Blow Mains AMIS120 115 4 Amperes Slow Blow The DC fuse is located on the circuit board This is a feature of the AMIS series amplifiers which are equipped with a current limiting circuit preventing excessive DC currents thus eliminating the risk of blowing high tension fuses In the unlikely event that the DC fuse actuates the output transistors should be checked as it is probable that the amplifier has been subjected to very extreme conditions The DC fuses are 10A time lag fuses TEST PROCEDURE MODEL AMIS 120 1 Perform physical inspection Visual Inspection stage 11 Check Earth connection for good contact XLR GND to AC earth e All wiring points for good contacts soldering and crimping PRETESTING PRE TESTING SETUP REQUIREMENT a Oscilloscope b Multimeter Load 4Q e Signal generator Connect amplifier to Variac 0Vac Signal generator no signal Resistive load 40 on 40 terminal Reset controls Volume controls to minimum Bass treble control to center Phantom power switch to off R33 amp R34 Bias adjustment pots on the amplifier PCB fully anticlockwise WO N Power up 3 1 Turn on power switch and adjust voltage to 115VAC 230VAC Watch current meter for excess curren
18. c 35V Multi layer ceramic 100V 4 electrolytic 35V 47uF electrolytic 35V 47u C18 330P C2 120p 1nF Metalised Polyproplyene 63V Multi layer ceramic 100V Multi layer ceramic 100V 400n Metalised Polyester 1007 1 ever ceramic M tliced Folypiogivene G3V 1 Nelalised Polyproplyene GV 2125270477 2121230470 2127181220 2121230470 2121230470 2127280336 2127180121 2124182100 Manufacture code Order code 407 4 7uF NPE electrolytic 50V 2120250479 120 470 147000 electrolytic 40V 1 AD00u 4700uF electrolytic 40V 10n Multi layer ceramic 100V BAV21 BAV21 VC BAV21 Small signal diode BAV21 Small signal diode 1N4004 Rectifier Diode 400V 1A metalised Polypropylene 275v Small signal diode 9902 DAC ABB Rn 1N4004 Rectifier Diode 40 Aamp LM1458 LM1458 IC1B LK1 OR R1 0222 112 W Metal film resistor 2k2 1 2 W Metal film resistor R13 1M 1 2 W Metal film resistor R15 10k R17 470R Dual Dual op amp 1 2 w Metal film resistor OR 1 2 W Metal film resistor 1 2 W Metal film resistor 1 2 W Metal film resistor e Metalised Polyproplyene 63V 22n 400V _imetalised Polyproplyene 275V DEE Small signal diode LM7818 Regulator 18 To 220 s oe Ee PWS SW w
19. ck speaker selector outputs both individual and Call Check for the reverse action of the switches 5 3 Keep signal in CHI insert INSERT PLUG having external signal of different frequency the out put should cut off and switch over to applied insert signal check signal on inset plugs ring terminal with respective ground should be 300mV Remove insert plug 5 4 Keep signal in CHI short V C terminals out put should mute 5 5 Check Phantom Switch for on off operation Measure Phantom voltage on an XLR inputs should be 14 5VDC Reset the phantom switch Phantom power on each XLR can be checked with the LED jig 5 6 Switch off the set connect battery 24V check for rated out put power out put signal will clip up to 2 FINAL TESTING Requirements for final testing a Load 400 b Multimeter c Oscilloscope d Microphone 6 Check sensitivity of all channel Optional 6 1 Mic input CH1 CH4 out put 70V 5V 6 2 AUX input CH1 CH3 150mV out put 70V 5V 6 3 AUX input 150mV out put 32 5V 1 5V 6 4 Check the Power bandwidth 68Hz X5Hz 15KHz 2KHz 6 5 Check Bass control 100HZ 12dB TOL 1dB and treble 10kHz 10dB tol 1dB 6 6 Check that input signal and output signal are in same phase by comparing CH 1 AUX Input and all other Outputs 25V 70v 40 80 7 Priority check optional 7 1 Plug microphone into input 1 and oscillator to input 3 Check fo
20. e 1 2Vcc bias voltage flows through R76 330R This generates a voltage increase on the output if op amp IC7B LM1458 or equivalent above the reference voltage 1 2Vcc The second op amp IC7A LM1458 or equivalent inverts this voltage to a voltage difference below the reference voltage Thus if the pot is turned to S C the voltage difference below the reference voltage is 7 5 10 kohm 330 ohm 248 mV 248 mV 3 mV dB 82 dB From this you can see that when a 500k pot is attached the initial attenuation is 7 5 510 kohm 330 ohm 4 85 mV 4 85 mV 3 mV dB 1 62 dB These calculations are only approximate and are used to show operation of the circuit Tone Generators Four separate tones are available from the in built tone generator board All four tones can be activated individually via a contact closure connected to the screw terminals on the rear of the amplifier When any tone 15 activated all inputs except for inputs 1 and 2 will automatically mute The level of the tone generator is controlled by the pot labelled R6 located behind the Bass adjustment pot This pot adjusts the level for all 4 tones Tones available on the AMIS60 and AMIS120 include Evacuation Tone Alert Tone Bell Tone Pre Announce Chime Theses inputs are pulled up to 5VDC internally through resistors The tones are generated through a combination of digital frequency modulation and analogue amplitude modulation T
21. et The 3 pin IEC power inlet is located on the bottom left of the rear panel and accepts a standard mains power lead fitted with an IEC connector Before plugging in a power lead please check the rear panel of the amplifier to ensure that the voltage switch is set correctly for your part of the world The operating voltage is 230 240 VAC 50 Hz 240V version 115 VAC 60 Hz 115V version 240V version The inlet is equipped with an inbuilt AC fuse holder fitted with a 4 amp fuse ACM120 or a 2 amp fuse ACM60 plus a spare within the holder 115V version The inlet is equipped with an inbuilt AC fuse holder fitted with an 8 amp fuse AMIS120 or a 4 amp fuse AMIS60 plus a spare within the holder Power consumption is approximately 125 VA for the AMIS60 and 250VA for the AMIS120 24 Volt DC Power Inlet The AMIS60 amp AMIS120 feature optional 24VDC power to run off a battery supply if required This is connected via the rear terminal strip The front panel Power Switch will not switch DC power or off in DC operation In this mode the amplifier is always on There is no trickle charge resistor across the diode one diode of a bridge rectifier 230V 240V Slide Switch 240V version The operating voltage of the amplifier is user selectable between 230V and 240V via a slide switch located on the top left side of the rear panel This switch should be set to match the AC voltage of your country The mains
22. he output of the microcontroller IC13 6 54 on pin 17 is 0 5V square wave of varying frequency depending on the tone selected This signal is amplitude modulated using a VCA IC8 M5222P The envelope is controlled by the charging and discharging of the electrolytic capacitor C47 with the sink and sourcing of current on the microcontroller outputs pins 1 2 amp 13 Page Chime Enable Button This allows the user to disable or enable the Pre Announce Chime This switch does not activate the chime Activation is accomplished via the rear panel barrier strip normally wired to a paging microphone If the pre announce chime is connected to a paging microphone meaning that it would be activated by the switch on the microphone the Page Chime Enable switch on the front panel of the amplifier allows the user to disable the chime function on those occasions when it is not require VOX Muting This feature provides automatic muting channels 3 amp 4 when signal is applied to either channels 1 or 2 It is normally used so that a paging microphone can have priority by muting over background music The muted channels will automatically ramp back up to normal volume when the signal on channels 1 and or 2 is no longer active The amplifier ships with the VOX muting function enabled To disable the VOX muting move the jumper labelled JP2 located just to the left and behind the level pot for channel 1 to the middle and left pins Factory set
23. iode D4 BAV21 or equivalent This time can be considered instant The on time is determined by the charge time of C21 22uF through R77 22k This is approximately 2 seconds It must be remember that the relay circuit is designed to be fail safe so that when power is on the relay is on and therefore the relay must turn off quickly when priority is on and on slowly when priority Is off This is to avoid chatter of the relay Control An external pot 500K can be connected to the AMIS60 120 for remote control of the master level The external pot is governed by the master level of the amplifier allowing the installer to set the volume then lock the amplifier in a rack leaving the user with just a master volume control that cannot go beyond the level set on the master front panel control Connection is via 2 wire terminal strip the rear panel the amplifier Shorting this input will mute the amp The VCA IC has a Voltage Gain ratio of approximately 3mV dB That is a voltage difference of approximately 300mV below the reference voltage pin3 7 5V will provide full mute 80dB The need to have the remote pot on two wire connection means that there is a small amount of attenuation approx 1dB when the pot is connected For the best audio control a log pot should be used The control circuitry is a DC attenuator and an inverter When a pot is connected the current through R64 10k and the pot resistance generated from th
24. ire wound resistor Te Wein Raa fm resistor 2127180121 2125270477 2121240472 2133400201 2133400201 A EMT EIU PET 2133400201 2133400201 2133440004 2152810458 2152810458 9111590000 2111450228 oU SENS IET 9111590102 9111590222 9111590105 9111590103 9111590471 9111590102 10k 112 W Metal film resistor 9111590103 1 1 2 W Metal film resistor 9111590105 1k 1 2 W Metal film resistor 9111590102 WHI 2 1 1 2 W Metal film resistor 9111590102 e BW wire wound resistor 1 111450558 0822 5 5W wire wound resistor 2111450228 560R 1 2 W Metal film resistor 9111590561 2 4 755 4708 1 2 W Metal film resistor 9111590471 RT PWS SW wire wound resistor 2411450108 10R 1 2 W Metal film resistor 9111590100 e e Metall resistor 9 1008 Cermet horizontal 2002211101 22K 112 W Metal film resistor 9111590223 470k 1 2 W Metal film resistor 9111590474 560 112 W Metal film resistor 9111560561 1 1 2 W Metal film resistor 9111590102 OR1 PW5 5W wire wound resistor 2111450108 15R 2W 2 W Metal oxide resistor 211 1220150 Jano 0 22 PW5 5W wire wound resistor 2111450228 PW5 R22 A 1 1 2 W Metal film resistor 9111590102 e eee ee AKT7 112 W Metal film resistor 9111590472 10 1 2 W Me
25. qr c29 3 Vos fluting CH 2 ZE sis 238 C22 R10 M 2 787 fts cid C45 Red C24 R81 Q R42 R3 R25 8 R26Lk4 25 R27 R2 E 8 CZ EE R30 RSR6 829 LOCH 2 LB Kate 0000 Bez LK1 C2 UCC 172UCC GND CH2 CH3 CH4 OUT OUT R14 PCB 6235 CAMIS120 60PRE AMP R20 R19 R41R4 R26 R22 e R21 R25 OO 3 0000 H R42 LK2 R16 R24 17 R12R18 823 C27 o TELEPHONE INPUT R31 R34 R37 R33 je R32 R35 R36 C15 14 AMIS120 Power amplifier Component list DesignatorPart Type Description 1 C1 470n C10 47u E S enn C12 22P mim Metalised Polyproplyene 63V A4TUF electrolyti
26. r muting of channel 3 7 2 Plug microphone into input 2 Check for muting of channel 3 7 3 Check mute disable function Insert Disable Enable link Factory set ENABLE 8 Check 4 tone switched inputs Set output level of tones to approx 14Vrms 2V using evac tone Check Page chime button for operation Make sure channel 3 amp 4 mutes with any of the tone s 9 Check telephone input sensitivity for CH2 US models only Tel input 2150 mV out put 70V 10 Increase the signal such that you get 76V amp you can see the overload protection coming on with a kink on sine wave if it is there then reduce the voltage to 35V out and then short output Release the shorting and check for the output Remove input signal and check for Hum amp Noise lt 20mVrms Reset volumes to minimum Disconnect from test bench and inspect for scratches on external paint Check the thermal cut off It should be between 95 105 C Allowable up to 115C If the sets show thermal trip above 115 then charge R49 to 3K9 or so 14a Factory setting of links a VOX Muting Enable b Con Disable VOX Relay Enable LISTENING TEST Requirements for Listening Test Setup a ACD Player b Speaker c Microphone Connect amplifier to the signal source and the speaker 15 1Set all tone pots at center position switch on the amplifier and check for any turn on thump 15 2 Connect the CD Player to an Auxiliary input channel
27. t draw Current should not exceed 0 5A 3 2 Check DC power supply at fuses Should be approx 34V 1 5 3 4 Check DC voltage on mixer board Should be approx 15V 0 5V 3 5 Check 1 2 VCC on mixer board should be 8 VDC 0 5 3 6 Measure DC voltages on of mixer amp input PCB s p8 15V 4 596 p4 OV 100mV pl 8V 596 but on power it should be P8 18V 596 other remain same 3 7 Put a multimeter across R30 the meter should read 1 0mV 5 then slowly adjust the preset R33 so that you get 3mV additional to the base reading 3 8 Repeat 3 7 for R39 adjusting preset R34 3 9 Un do step 3 1 AC Check 4 1 Set signal generator to ImV Turn up Micl volume control to full Watch for irregularities with output 4 2 Set output to 35V using master volume control Check voltage across Emitter resistors on power devices 4 3 Voltage should be between 150 200mV Min and max values should be between 33 of the average value i e min max 0 5 4 4 Turn master up to full Check sensitivity of input MIC ImV 10 22V in 40 load 4 5 Check the output of all channels 4 6 Measure 25V line 70V LINE 8ohm 32Vac tol 5 4 7 Check tape outputs L and 250mV 50mV Measure on RCA socket 4 8 Check line outputs Approx 2 7V 1 5V 5 Function Checks 5 1 Check that you have the header link s on to a muting enabled Right Side b VCA Con Disabled Back Side c Vox relay enabled Right Side 5 2 Che
28. tal film resistor 9111590103 10K 10k NTC thermistor 2111911103 22 10k 1 2 W Metal film resistor 9111590103 4 54 2 1 2 W Metal film resistor 9111590473 UORASDPGO EE Rocker switch round 2511213112 iMains Transformer TIP36C Transistor 2141600036 TIP36C Ig RE LC BC639 Transistor 2144200639 640 Transistor 2144200640 BC639 Transistor 2144200639 ein TIP36C Transistor 2141600036 ee eS BC546 Transistor 2144200546 aieo Transistor 2141400140 TIP36C Transistor 2141600036 s a BC639 Transistor 2144200639 EE 2 Transistor 2141300042 SIL6 SIL2 AMIS120 Mixer Component List Designator Part Type Description Manufacture code Order Code mam mae Meena 2 2u2 Electrolytic 63V 2121260229 33p Multilayer Disc Ceramic 2127280336 417 Electrolytic 35V 2121230479 47u Electrolytic 35V 2121230479 14 33p Multilayer Disc Ceramic 2127280336 M a 2n2 Multilayer Disc Ceramic 2127181221 100 Poly 100V 2124282101 18 100n Metallised Poly 1007 2124282101 is 407 Eleciroiytic 35V ies 429345 Poly 100V 2124282101 22u Electrolytic 35V 2121231220 so c dU C ee 4u7 Electrolytic 35V 2121230479 a SUI 4u7 Electrolytic 35V 2121230479 E vases 33p Multilayer
29. ting is with VOX enabled with the jumper on the middle and right pins Channels 3 amp 4 are summed through IC1B LM1458 or equivalent to the VCA IC4 M5222P which does the muting The VCA is held on i e no attenuation by R55 10k pulled to the reference voltage and the reverse biasing of diode D3 21 or equivalent by R22 and R21 This is to eliminate any attenuation by the op amp IC1A LM1458 or equivalent and its supply which may be different to the internal reference voltage of the VCA The control pin of the is pulled down by amp This op amp runs at very high gain to activate on even very small signal The jumper JP2 shorts out the feedback resistor thus removing the sensitivity The attack of the muting circuit is controlled by the charging of C13 47uF through R22 100k and the release by the discharge if C13 through R37 2k2 Note that VCA will mute at 250mV 80dB below the reference voltage so the muting will occur only over the range of approximately depends on VCA production batch 7 2V to 7 5V The charging of the capacitor occurs from approximately 1V to 8 1V 5222 pin out 1 Outputl 2 Inputl 3 Reference voltage 4 Gnd 5 Control 6 Input2 7 Output2 Note The M5222P is a current in current out device Voltage conversion is done through resistors The maximum input current is 50uA rms Current gain is 0 5 Fuse Sizes 240V version
30. transformer is wound with a 230V winding plus a 10V winding internally connected Power Amp The power amp is a push pull single supply amplifier driving a centre tapped transformer The amplifier has an overall gain of approximately x10 and the transformer has a turns ratio of approximately x7 240V version x5 115V version The sensitivity of the amp is approximately 2 7V A particularly good aspect of this amplifier 1s the current limiting circuit The sensing circuit is a standard rail load line limiting circuit but it 15 the drive circuit that 15 important As transistors V12 amp V14 BC640 turn on transistor V11 BC639 it pulls bias current away from the amp through diodes D1 amp D4 BAV21 and pulls drive away from the op amp LM1458 through the diode resistor pair D2 R12 BAV21 2k2 amp D3 R23 Individually each topology acts to limit the current in the amp but it is the combination of the two and the fine tuning of there interaction that produces the characteristic soft limiting without the harsh crossover distortion It is not until the amp is in hard clip does the amp produce the high freq crossover distortion This makes for nice sounding current limit that allows for soft distorted peaks to get through but limits continuous excessive current while maintaining thermal stability Speaker Output Terminal Strip 240V version The screw terminals on the left hand side of the strip allow access to the direct speaker outp
31. uts of the amplifier Reading from left to right the terminals are COM or for low impedance speaker loads 4 or 8 ohms 4 Positive for 4 ohm speaker loads use with common AMIS120 only 8 Positive for 8 ohm speaker loads use with common COM Common or for 70v 100 speaker loads maximum load of 80 ohms at 100v AMIS120 amp 160 Ohms at 100v AMIS60 70 Positive for 70v line speaker loads use with common 100 Positive for 100v line speaker loads use with common Please ensure that the correct Common is used Low impedance and 70 100v loads can be used simultaneously but please pay careful attention to the overall speaker load Note The minimum impedance or maximum load at 100 volt line should be no less than 80 Ohms for the ACM120 and no less than 160 Ohms for the AMIS60 115V version The screw terminals on the left hand side of the strip allow access to the direct speaker outputs of the amplifier Reading from left to right the terminals are COM or for low impedance speaker loads 4 or 8 ohms 4 Positive for 4 ohm speaker loads use with common AMIS120 only 8 Positive for 8 ohm speaker loads use with common COM Common or for 25v or 70v speaker loads maximum load of 40 ohms at 70v AMIS120 amp 80 Ohms at 70v AMIS60 25 Positive for 25v line speaker loads use with common 70 Positive
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