AMC+120 MIXER AMPLIFIER

Transcription

1 SERVICE INFORMATION AMC0 MIXER AMPLIFIER CONTENTS: OPERATION MANUAL SCHEMATIC DIAGRAMS COMPONENT OVERLAYS TEST PROCEDURE REPLACEMENT PARTS LIST SERVICE BULLETIN Australian Monitor Clyde Street, Silverwater NSW 8 Australia 9

2 AMC SERIES 0W/0W/0W/0W MIXER AMPLIFIERS INSTALLATION AND OPERATION MANUAL

3 IMPORTANT SAFETY INFORMATION. Save the carton and packing material even if the equipment has arrived in good condition. Should you ever need to ship the unit, use only the original factory packing.. Read all documentation before operating your equipment. Retain all documentation for future reference.. Follow all instructions printed on unit chassis for proper operation.. Do not spill water or other liquids into or on the unit, or operate the unit while standing in liquid.. Make sure power outlets conform to the power requirements listed on the back of the unit.. Do not use the unit if the electrical power cord is frayed or broken. The power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords and plugs, convenience receptacles, and the point where they exit from the appliance.. Always operate the unit with the AC ground wire connected to the electrical system ground. Precautions should be taken so that the means of grounding of a piece of equipment is not defeated. 8. Mains voltage must be correct and the same as that printed on the rear of the unit. Damage caused by connection to improper AC voltage is not covered by any warranty. 9. Have gain controls on amplifiers turned down during power-up to prevent speaker damage if there are high signal levels at the inputs. 0 Power down and disconnect units from mains voltage before making connections.. Never hold a power switch in the ON position if it won t stay there itself!. Do not use the unit near stoves, heat registers, radiators, or other heat producing devices.. Do not block fan intake or exhaust ports. Do not operate equipment on a surface or in an environment which may impede the normal flow of air around the unit, such as a bed, rug, weathersheet, carpet, or completely enclosed rack. If the unit is used in an extremely dusty or smoky environment, the unit should be periodically blown free of foreign matter.. Do not remove the cover. Removing the cover will expose you to potentially dangerous voltages. There are no user serviceable parts inside.. Do not drive the inputs with a signal level greater than that required to drive equipment to full output.. Do not connect the inputs / outputs of amplifiers or consoles to any other voltage source, such as a battery, mains source, or power supply, regardless of whether the amplifier or console is turned on or off.. Do not run the output of any amplifier channel back into another channel s input. Do not parallel- or series-connect an amplifier output with any other amplifier output. Australian Monitor Inc is not responsible for damage to loudspeakers for any reason. 8. Do not ground any red ( hot ) terminal. Never connect a hot (red) output to ground or to another hot (red) output! 9. Non-use periods. The power cord of equipment should be unplugged from the outlet when left unused for a long period of time. 0. Service Information Equipment should be serviced by qualified service personnel when: A. The power supply cord or the plug has been damaged. B. Objects have fallen, or liquid has been spilled into the equipment C. The equipment has been exposed to rain D. The equipment does not appear to operate normally, or exhibits a marked change in performance E. The equipment has been dropped, or the enclosure damaged. THIS SAFETY INFORMATION IS OF A GENERAL NATURE AND MAY BE SUPERSEDED BY INSTRUCTIONS CONTAINED WITHIN THIS MANUAL

4 INTRODUCTION AND CONTENTS The Australian Monitor AMC series of amplifiers takes the heritage and reliability of our famous AMIS series amplifiers and integrates these features into low cost amplifiers for applications where reliability is everything, but the more elaborate features of our AMIS series are not required. Available in 0, 0, 0 and 0 watt versions, the AMC series are RU mixer amplifiers, featuring 0/00 volt line and ohm outputs, and universal mic/line inputs. Master volume and overall treble and bass controls are provided, along with Vox triggered muting (defeatable), giving channel priority over inputs, and. There is also the facility to add a tone generator card. The Australian Monitor AMC series gives the contractor a low cost alternative in applications that are price sensitive, but still require a high quality of sound reproduction and reliability. INTRODUCTION FRONT PANEL REAR PANEL INSTALLATION TROUBLESHOOTING AND BLOCK DIAGRAM FUNCTIONAL NOTES AND INTERNAL ADJUSTMENTS 8 DIMENSIONS 9 SPECIFICATIONS 0 AUS, EUR, USA Copyright st Apr 00 Rev A: st Apr 00 Rev B: th Jun 00 Rev C: th May 008 CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol is intended to alert the user to the presence of uninsulated dangerous voltage within the products enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK), NO USER SERVICEABLE PARTS INSIDE, REFER SERVICING TO QUALIFIED SERVICE PERSONAL. This symbol is intended to alert the user to the presence of important operational and maintenance (servicing) instructions in the literature accompanying the appliance. WARNING! TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. Caution: To prevent electric shock do not use this (polarised) plug with an extension cord, receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure. To prevent electric shock, match wide blade of plug to wide slot, fully insert. AMC SERIES INSTALLATION AND OPERATION MANUAL PAGE

5 front PANEL CH These control the levels for each channel input. Bass There is db of cut and boost at 00Hz. Treble There is 9dB of cut and boost at 0kHz. Master This controls the overall mixed output level. On This LED indicates the unit is powered on. Power This switch switches power on or off the mains. The up position is on. PAGE AMC SERIES INSTALLATION AND OPERATION MANUAL

6 REAR PANEL CH Each channel input section has two inputs: XLR input This is a balanced microphone input. It has an input sensitivity of mv. RCA input This is an unbalanced line level input. It has an input sensitivity of 0mV. The two RCA sockets are summed to mono internally. REC Output The REC output is on unbalanced RCA connectors. The output level is 0mV into 0kohm at rated output. The output is dual mono. The REC output is not affected by the MASTER volume control or the BASS and TREBLE controls. The REC output does not receive the tone signal if the optional tone generator module is installed. Line Output The LINE output is on a balanced XLR connector. The output level is 0.V into k at rated output. Note: When wiring the LINE output as unbalanced, Pin should be wired as hot and Pin should be wired as ground/ shield. Do not wire Pin. Direct Out The speaker connections are on the pole terminal strip. There is a low impedance output (OHM) and a distributed line voltage output (LINE). 0V out is available on V models. 00V out is available on 0V/0V models. Minimum Impedance AMC 0 AMC 0 AMC 0 AMC 0 Distributed Line Output 0V (V version) ohm 8ohm ohm 0ohm 00V (0/0V version) ohm ohm 8ohm 0ohm Low Impedance Output (both versions) ohm ohm ohm ohm Note: Only connect one output either Distributed Line or Low Impedance per channel. Do not connect LowZ and 0/00V at the same time. The output strip comes fitted with a touch-proof cover held in place by two M machine screws with flat and spring washers. IEC Mains Input Socket This is a standard IEC pin socket. It accepts a standard IEC mains cable, provided. The fuse draw at contains the mains fuse and a spare. The mains fuse is a time lag (slow blow) HRC 0mm x mm ceramic type fuse. The ratings are: AMC 0 AMC 0 AMC 0 AMC 0 0V/0V model 0.A.A A.A V model A.A A.A Always replace the fuse with one of the same value and type. Note: Always disconnect power to the amplifier before replacing fuses. (Optional) Tone Module These terminals are for use with an optional tone module (not supplied). Use Australian Monitor ATC88 module. Phantom Power V phantom power is available for condenser or electret microphones on the XLR input when this switch is pushed in. AMC SERIES INSTALLATION AND OPERATION MANUAL PAGE

7 installation Mounting When rack mounting, it is advisable to allow rack space above and below the amplifier. When multiple amplifiers are mounted in a rack, exhaust fans should be used on the rack. Airflow for cooling the AMC0, AMC0 and AMC0 is by convection from bottom to top. Airflow for cooling the AMC0 is by fan from front to side. Direct Output The output terminal strip accepts wire sizes from -AWG (.mm 0.mm) or spade lugs. The following table should be used as a guideline for cable sizes. Regulations in your area may require different gauged wire and should be checked before using. Output Distance Wire Size AMC 0 AMC 0 AMC 0 AMC 0 00V Up to 0m AWG(0.mm ) AWG(0.mm ) AWG(0.mm ) AWG(0.mm ) 0m 00m AWG(0.mm ) AWG0(0.mm ) AWG8(0.mm ) AWG(.mm ) Over 00m AWG0(0.mm ) AWG8(0.mm ) AWG(.mm ) AWG(.mm ) 0V Up to 0m AWG(0.mm ) AWG(0.mm ) AWG(0.mm ) AWG8(0.mm ) 0m 00m AWG0(0.mm ) AWG8(0.mm ) AWG(.mm ) AWG(.mm ) Over 00m AWG8(0.mm ) AWG(.mm ) AWG(.mm ) AWG0(.0mm ) ohm Up to 0m AWG8(0.mm ) AWG8(0.mm ) AWG8(0.mm ) AWG8(0.mm ) 0m 0m AWG(.mm ) AWG(.mm ) AWG(.mm ) AWG(0.mm ) Over 0m Not Recommended Not Recommended Not Recommended Not Recommended Note: Only connect one output either Distributed Line or Low Impedance. Line Output The LINE output XLR can be used to connect up to booster amplifiers. Balanced wiring (shielded pair cable) is recommended. Note: When wiring the LINE output as unbalanced, Pin should be wired as hot and Pin should be wired as ground/shield. Do not wire Pin. REC Output The REC output wiring should be kept as short as possible. Input Connections For wiring balanced in, pin is hot. Unbalanced wiring on the microphone inputs is not recommended. Balanced input wiring (shielded pair cable) is recommended. Unbalanced RCA wiring should be keep as short as possible. PAGE AMC SERIES INSTALLATION AND OPERATION MANUAL

8 troubleshooting and block diagram Troubleshooting Guide Trouble Likely Cause Remedy Power LED not on Power not reaching amplifier Check power switch is on Check mains connection Check mains fuse Distorted sound No sound but amp is on No sound from channels and Output is short circuit Input is overloaded Output is being over driven Bass control is turned up Volume controls down Amplifier has overheated (AMC 0, AMC 0 AMC 0 only) DC fuse(s) blown Priority function is being used Check speaker loads for shorts Reduce input level at source Reduce volume levels on front panel Reduce Bass control level Check volume controls Check for obstructions above and below Make sure the amplifier is well ventilated Refer product to local Australian Monitor dealer Remove signal (disconnect input) from channel OR Disable priority function (see Internal Adjustments) Tones do not sound when triggered Tone generator module not installed Purchase optional Tone generator module AMC SERIES INSTALLATION AND OPERATION MANUAL PAGE

9 functional notes and internal adjustments PRIORITY Channel will mute channels, and. This will only occur when signal appears on channel, irrespective of the channel volume control. Priority can be disabled. (See below). The release time is approx. secs and is NOT adjustable. The mute depth is approx. 0dB and is not adjustable. PAGE 8 AMC SERIES INSTALLATION AND OPERATION MANUAL

10 dimensions AMC SERIES INSTALLATION AND OPERATION MANUAL PAGE 9

11 specifications AMC 0 AMC 0 AMC 0 AMC 0 POWER OUTPUT (0.%THD, KHZ) 0W 0W 0W 0W S/N RATIO > dbr > dbr > 80dBr >8dBr POWER BANDWIDTH (-db db) 8Hz-kHz Hz-kHz Hz-kHz 0Hz-0kHz FUSES MAINS (V).0A.A A.A MAINS (0/0V) 0.A.A A.A DC.A (x) A 8A 0A (x) OUTPUT REGULATION 9% 9% 9% 90% SIZE (WXHXD) 8 x 88 x 90mm 8 x 88 x 8mm 8 x 88 x 8mm 8 x 88 x 8mm 9 x. x. 9 x. x. 9 x. x. 9 x.. NET WEIGHT.0kg 8.kg 0.kg.kg.lb 8.lb.lb.lb SHIPPING WEIGHT.kg 0.kg.kg kg.lb.lb.lb 0.8lb SHIPPING DIMENSIONS (WXHXD) 0 x x 9mm x x 8mm x x 8mm x 8 x 0mm 0. x. x. 0. x.9 x. 0. x.9 x. 0. x. x 8. MAINS CURRENT DRAW (0V) FULL POWER 0.A 0.A.0A.A / POWER 0.A 0.A 0.80A.A /8 POWER 0.A 0.A 0.A.0 IDLE 0.08A 0.A 0.A 0.A MAINS CURRENT DRAW (V) FULL POWER 0.A.8A.0A.8A / POWER 0.8A 0.9A.A.A /8 POWER 0.A 0.A.A.0A IDLE 0.A 0.A 0.A 0.A THERMAL OUTPUT (W) FULL POWER 8W W 8W 9W / POWER W W 8W W /8 POWER W W 9W 8W IDLE W 9W W W THERMAL OUTPUT (BTU/HR) FULL POWER / POWER 0 88 /8 POWER 90 IDLE */ and /8 power levels relate to voltage changes, not load changes. PAGE 0 AMC SERIES INSTALLATION AND OPERATION MANUAL

12 specifications COMMON TO ALL MODELS THD (KHz, -db) Better than 0.% MIC INPUT SENSITIVITY 00ohm IMPEDANCE k ohm HEADROOM mv (db) AUX INPUT SENSITIVITY 0.V/@00kohm IMPEDANCE >00kohm HEADROOM > V (>0dB) TONE CONTROL 00HZ /- db 0KHZ /- 9 db LINE OUT NOMINAL OUTPUT kohm OUTPUT IMPEDANCE 00ohm REC OUT NOMINAL OUTPUT 0kohm OUTPUT IMPEDANCE kohm AMC SERIES INSTALLATION AND OPERATION MANUAL PAGE

13 AUSTRALIA AND NEW ZEALAND SYDNEY MELBOURNE BRISBANE ADELAIDE PERTH AUCKLAND (NSW & ACT SALES) (VIC & TAS SALES) (QLD SALES) (SA & NT SALES) (WA SALES) (NZ SALES) Clyde Street Silverwater NSW 8 Private Bag 9 Silverwater NSW 8 Phone: (0) 9 Fax: (0) nsw@audiotelex.com.au / Middleborough Road Box Hill VIC 8 PO Box Blackburn South VIC 0 Phone: (0) 9890 Fax: (0) vic@audiotelex.com.au Commercial Road Fortitude Valley QLD 00 PO Box 8 Fortitude Valley BC QLD 00 Phone: (0) 8 Fax: (0) qld@audiotelex.com.au Walsh Street Thebarton SA 0 PO Box Hindmarsh SA 00 Phone: (08) 8 Fax: (08) sa@audiotelex.com.au / Howe Street Osborne Park WA 0 PO Box 8 Osborne Park BC WA 9 Phone: (08) Fax: (08) wa@audiotelex.com.au 9C Piermark Drive Albany 0 New Zealand PO Box 00- Albany 0 Phone: (09) 9 Fax: (09) 98 sales@audiotelex.co.nz EUROPE / ASIA / MIDDLE EAST INTERNATIONAL SALES Clyde Street Silverwater NSW 8 Australia Private Bag 9 Silverwater NSW 8 Phone: 9 Fax: 98 international@audiotelex.com.au

14 8 RCA RCA P TAPE OUT R0 K A XLR XLR-FEMALE RCAA RCA-POLE L G R R8 R9 R 0K R 0K R 80R R 80R C8 0/ NP C9 0/ NP C 0/ NP C 0p R 8 R C 0p ICB LM8 C0 u R9 0R C.u R K C u CN GRD AG(/ ) CH OUT CH OUT CH OUT CH OUT MIX OUT 8 MIX OUT 9 TAPE OUT 0 CON0 A B G XLR XLR-FEMALE RCAB RCA-POLE L R R0 R R 0K R8 0K R 80R R 80R C 0/ NP C 0/ NP C 0/ NP C 0p C R9 R0 0p ICA LM8 C u C 0/ C u C u / C 0/ XLR LINE OUT XLR-MALE B C G XLR XLR-FEMALE RCAA RCA-POLE L R R R R 0K R 0K R 80R R 80R C 0/ NP C8 0/ NP C 0/ NP C 0p R R8 8 C 0p ICB LM8 R0 0R C9 u C0.u C RCAB RCA-POLE L R R 0K R 0K C 0/ NP R D G XLR XLR-FEMALE R C.u R R 80R R 80R SWA P/P C 0/ NP C8 0/ NP C9 0p 8 R C0 0p ICB LM8 C u REV REVISION NOTE: DRN DATE A B C D Added th channel & P/P CKW /0/08 E F AUSTRALIAN MONITOR DRAWING No: SIL//09 DESCRIPTION: AMC 0/0/0 MIC INPUT DATE: DRAWN BY: SHEET of D 8

15 8 R 0k A C9 A N/C B Driven by balanced signal CN CON R k THERMISTOR 0K R k TH C 0n C 0n V R k C n R 0k R 0k C n R 00R T C8 R8 k R9 k R k R k T C8 C.u/ R k R k C.u/ R 0k R 00R T BD9 R8 0R R9 0R TF Driver TXFR : T BD9 BIAS R k R 0R R 0R R k R 0R R 0R D N00 T BC9 T BC9 R R R8 *** R9 *** R0 R C8 C N/C Vc Vc Vc Vc T TIPC R 0R R 0R T8 TIPC T9 TIPC R 0.9R/W R 0.9R/W T0 TIPC T TIPC R 0.9R/W R 0.9R/W T TIPC T *** R *** R8 *** T *** O/P TXFR 00V Com Ohm Com BIAS R 0k k PR R k V R 80E/W T BCB B R k R0 00R R 0k R0 00R BIAS D N00 N/C Vc Vc Vc Vc R 0k C0 Model Variations *** AMC0 / AMC0 D, D AMC0 - N/C AMC0 - A0 N/C T, T AMC0 - N/C AMC0 - TIPC C F HRC 0W-A/0W-.A Mains 0/0 V 0V PRIM(9.V) D A0 D *** D A0 C *** F C 00u/V VC R9 8 A (0R/W) X R0 k T BD9 V R, R8 AMC0 - N/C AMC0-0.9R/W C AMC0 - N/C AMC0-00uF/V R8, R9 AMC0-0R AMC0 - R C PRIM(9.V) D *** V D C u/0 C u/0 D D REV A B C D E F REVISION NOTE: DRN DATE Increased gain, removed 0/0V switch, removed zobel CKW /0/08 AUSTRALIAN MONITOR DRAWING No: AMC0_0Amp DESCRIPTION: AMC 0/0 Amp DATE: DRAWN BY: SHEET of 8

16 R 0k C9 N/C A Driven by balanced signal CN CON R k THERMISTOR 0K TH C 0n V R k C n R 0k R 0k R 00R T C8 R k R8 k R9 k C.u/ R k R k R 0k R 00R T BD9 R8 0R R9 0R TF BIAS R k R 0R R 0R R 0R D N00 T BC9 T R R R8 R R9 R C N/C Vc Vc Vc Vc T TIPC R 0R R 0R T9 TIPC R 0.9R/W R 0.9R/W T TIPC R 0.9R/W R 0.9R/W T TIPC R 0.9R/W R8 0.9R/W O/P TXFR 00V 0V Com Ohm BIAS R 0k k PR R k V R 80E/W T BCB A B R k C 0n C n R k T C8 C.u/ Driver TXFR : T BD9 R k R 0R BC9 R0 R C8 T8 TIPC T0 TIPC T TIPC T TIPC Com B R k R0 00R R 0k R0 00R BIAS D N00 N/C Vc Vc Vc Vc R 0k C0 N/C C C 0VAC TA V TA F V S Mains 0/V SW DPDT T C V PRIM(9.V) D A0 D A0 D A0 F T8A C C 00u/V 00u/V VC R9 (0R/W) X R0 k T BD9 V 0V V PRIM(9.V) D A0 V D C u/0 C u/0 D D Title Size Number B Date: /9/0 Sheet of File: \\..\AMC0.SCH Drawn By: Revision

17 8 8 D D C C B B A A DESCRIPTION: DRAWN BY: DRAWING No: DATE: REVISION NOTE: SHEET of AUSTRALIAN MONITOR DATE DRN REV F E D C B A AMC Mixer SIL// / / / / C0 PF C8 n C9 00P VR 0k VR 0k R k8 R k8 R 0k R 0k R0 0k R 80k C u C 0pF C u VR 0k R k R k VR 0k VR 0k VR 0k R R8 0k R 0k R K C u C 00p C 00P R R 00R R 00R OUT OUT- CH CH CH Line OUT Line OUT- R k R0 M R9 C pf R 00K C / R 00E K R8 k8 R 0K R Signal Signal 0E R TO AMP TO AMP C.u C.U R 0K R 0K C9 /V CN TH TH- IN IN- TH- TH IN IN- / R R9 0K R0 K GND V R 0E/W C 000/ CN R K CN LED PRIORITY C 0/ T C8 ICA LM8 8 ICB LM8 ICA LM8 8 ICB LM8 8 ICB LM8 ICA LM8 D BAV D VW C0 0/ D.9v D.9v / R 0K R K k R8 T C8 T C8 D BAV 00k R X Tone Module Input 0k R u C T BC k R9 0k R8 0k R0 TAPE OUT T C8 R K 0k TAPE OUT Changed to channels CKW /0/08 VR 0k R9 k k R T C8 CH Changed gain R k->k, C 0p->00p, R9 k-> CKW /0/08 G

18 Phantom Power RCA XLR XLR XLR R R R R R R IC R R8 R9 R0 R R R R R R R R8 C J IC C C C C C C C0 C8 C9 J C C0 J C C C C C C C8 C9 GND / VE CH CH CH CH OUT- OUT TAPE OUT C C CN J R9 C R0 XLR RCA R R R R R R C0 C9 C C C C8 R R R R C C XLR C S J J R R8 R9 R0 R R A9 AMC input-e

19 SIG SIG- GND TH M GND NC MUTE GND TONE OUT OUT- OUT CH CH CH GND / A K TAPE OUT OFF EN J9 0R J8 VR VR T R K X VR VR VR VR VR T T T R R R0 R9 R8 R R R R R R R0 R9 R8 R R R R R R R9 R8 R R R R R R R0 R8 R R R R R R R PRIORITY IC IC D CN D D D D CN CN C0 C9 C C C C C C C C0 C9 C8 C C C C R0 R C IC T C T R R9 J J J J J0 J0 J9 J8 J J J J J J J J J J J

20 GND V TH GND IN- IN AMC0 AMP TH CN CN C C R R9 R J J R J8 C C D T R0 D D D J J J R T8 PR T R9 R0 J0 R R R R8 T T9 T T0 T T R R R0 R R R8 R R R R0 R C C R F T T T T T T T D D R R J J R R R J R R J J J8 J9 J R R R C C T D R C R9 R8 R8 R R R9 R R CN R R C8 C C C CN CN C9 C0 R

21 MODEL: AMC0P TEST PROCEDURE XXXX- Rev A /09/08 Original Outline. Physical checks. Set up amplifier for test.. Fuse check.. Connections.. Reset controls. Power up.. Voltages.. Bias setup. Initial AC Checks.. Signal check and gain of amp.. Emitter current check.. Outputs.. Phantom power. THD. Sensitivity.. Input. Bandwidth 8. Phase 9. Current Limit 0. Noise floor / SNR. Fan/Thermal check. Final check for damage. Factory setting. Listening Test.. Switch on thump.. Audio quality.. Current Limit

22 Test Procedure VISUAL INSPECTION STAGE. Physical checks All screws for tightness (esp. bridge rectifier and transistor bolts), referring to the torque setting of the manufacturing tools Capacitors for polarity Earth connection for good contact, using multimeter (XLR GND to AC earth) Power transistors for shorts to heat sink using a multimeter All wiring points for good contacts (soldering and crimping) PRETESTING PRE TESTING SETUP REQUIREMENT a) Oscilloscope b) Variac c) Multimeter d) Load [ohm] e) Signal generator f) Phantom power jig. Set up amplifier for test :.. Fuse check x AC fuses (A), 0xmm x DC fuses (8A), 0xmm.. Connections Connect amplifier to: Variac (0Vac) Signal generator (mic, no signal) Resistive load (ohm on ohm terminal) with meters/oscilloscope.. Reset controls: Volume control to minimum PR (preset) on the amplifier PCB CCW. Power up : Turn on power switch and adjust voltage to 0VAC. Watch current meter for excess current draw. (P/F) Current shall not exceed 0.Aac... Voltages Measure the following DC voltages with a multimeter referenced to mains safety earth or the chassis. (P/F) DC power supply Input PCB rail (ICp8) Input PCB ½rail (ICp) Input PCB gnd (ICp) Pass Range.VDC.0VDC.0.0VDC.0VDC.0VDC.0VDC -0.VDC 0.VDC.. Bias setup Put a multimeter across an emitter resistor.

23 (P/F) Slowly adjust the preset PR so that you get.mvdc (/-0.mVDC) reading. Check Quiescent Voltage across all Emitter resistors. (P/F) The emitter resistor voltages shall be.mvdc (/-.0mVDC). [Setup for next test]. Initial AC Checks :.. Signal check and gain of amp Setup Signal generator = 0mVAC, khz Signal in = XLR Master pot = max (CW) Output metering = ohm out Load = ohm Procedure Turn up volume control to full. Watch for irregularities with output. (P/F) Output voltage shall be.9vac /-VAC... Emitter current check Setup Signal generator = 0mVAC, khz Signal in = XLR Master pot = max (CCW) Output metering = ohm out Load = ohm Procedure Set output to VAC using master volume control. Check voltage across emitter resistors of power devices. (P/F) Voltage shall be between 0mVDC 0mVDC... Outputs Setup Signal generator = ~0mVAC adjusted for.9v out with pots max, khz Signal in = XLR Master pot = max (CW) Output metering = ohm out Load = ohm Procedure Using a multimeter check the following: (P/F) Pass Range 00V line 90VAC 0VAC Measure on the terminal block. Remove all inputs and connections. Attach tested tag. Turn all volume pots to min.

24 FINAL TESTING REQUIREMENTS FOR FINAL TESTING: a) THD meter b) Load 80Ω c) Multimeter d) Oscilloscope e) Microphone f) Variac. THD Setup Signal generator = 0mVAC, khz Signal in = XLR Master pot = min (CW) Output metering = 00Vout Load = 80ohm Procedure Turn up master pot to 0VAC (/-.0VAC) on output. Measure THD. (P/F) Reading shall be < 0.%. Values to be recorded: Value Pass Range. THD 0% 0.%. Sensitivity.. Inputs Setup Signal generator = 0mVAC, khz Signal in = XLR Master pot = max (CW) Output metering = 00Vout Load = 80ohm Procedure Set channel pot to max. (P/F) The output reading shall be 00VAC (/- 0VAC).. Bandwidth Setup Signal generator = 0mVAC, khz Signal in = XLR Master pot = max (CW) Output metering = 00Vout Load = 80ohm Procedure Set the volume pot so the output is 0VAC. Adjust the frequency on the signal generator down till the output is 0VAC. (P/F) The frequency shall be <Hz. Adjust the frequency on the signal generator up till the output is 0VAC. (P/F) The frequency shall be >0kHz.

25 Values to be recorded Value Pass Range a. Bandwidth - low <Hz b. Bandwidth - high >0kHz 8. Phase Setup Signal generator = 0mVAC, khz Signal in = XLR Master pot = max (CW) Output metering = 00Vout Load = 80ohm Procedure Attach channel of the CRO to the input. Make sure the CRO is being triggered by the input. Look at each output on channel of the CRO. The CRO ground should be connected to the common both for the low impedance outputs and the line outputs. (P/F) The signals on the CRO shall be in phase for all outputs (00V, Ω). 9. Current Limit Setup Signal generator = 0mVAC, khz Signal in = XLR Master pot = min (CCW) Output metering = 00Vout Load = 80ohm Procedure Change the load to 0ohms. Increase the signal such that at ~VAC you can see the overload protection coming on with a rounding of the sine wave. If it is there then reduce the voltage to 0VAC out. Short the unit for ~0sec. Release the shorting link and check for the output. (P/F) The output shall be reading 0VAC /-V. 0. Noise floor / SNR Setup Signal in = none Master pot = max Output metering = 00Vout Load = 80ohm Procedure Put dummy lid on. Check for Hum & Noise. (P/F) The output shall be reading <.mvac (-90dBr ref 00V). Values to be recorded Value Pass Range 0. Noise floor 0mV.mV. Fan/Thermal check Setup Signal generator = 0mVAC, khz Signal in = XLR Master pot = max (CW) Output metering = 00Vout

26 Load = 80ohm Procedure Adjust volume pot to an output reading of 0VAC. Connect a thermometer to the temperature sensor. Wait the unit to heat up. A heat gun may be used to speed up the heating of the heatsink. (P/F) The output shall mute to < 0V at a temp between 90 degc Values to be recorded Value Pass Range b. Thermal cutout 90degC degc. Final check for damage Disconnect from test bench and inspect for scratches on external paint.. Factory setting Set up the unit for default factory setting as below: Pot positions: a) Master volume : min Attach tested sticker.

27 LISTENING TEST REQUIREMENTS FOR LISTENING TEST SETUP: a) CD Player b) mixer c) Speaker. Listening Test Connect amplifier to the setup Keep all pots full, tone at center... Switch on thump Switch on the set and check for any ON Thump. Ensure unit does not thump. Check that no low frequencies are audible. Make all pots minimum... Audio quality Check CD Player output... Current Limit Short the output with signal ON. Signal should mute and return.

28 AMC Parts Circuit boards Part Number Factory code Input board AMCIB Mixer board AMC0MB B00 AMC0 output board AMC0OPB B008 AMC0 output board AMC0OPB B00 AMC0 mixer board AMC0MB B00 AMC0 output board AMC0OPB B00 AMC0 output board AMC0OPB BR000 Transformers AMC0 mains transformer AMC0TX BR00 AMC0 output transformer AMC0OT BR00 AMC0 mains transformer AMC0TX BD0 AMC0 output transformer AMC0OT BD00 AMC0 mains transformer AMC0PTX BD0 AMC0 drive transformer BR000 BR000 AMC0 output transformer AMC0OT BR00 AMC0 mains transformer AMC0TX BR000 AMC0 output transformer AMC0OT BR00 AMC0 drive transformer BR000 BR000

29 Australian Monitor Service Bulletin AMC Mixer and Booster Amplifiers Mains Fuses 0 February 0 Applicable Models This bulletin applies to AMC0, AMC0, AMC0 and AMC0 Mixer Amplifiers and the AMC0P, AMC0P and AMC0P Booster Amplifiers manufactured prior to 0. Known Issue The AMC range of mixer amplifiers and AMC booster amplifier have experienced a higher than acceptable incidences of mains fuse failures at turn on. Details AMC products manufactured prior to 0 are fitted with inferior Chinese fuses. Solution The problem can easily be rectified by placing the existing mains fuse with name brand quality fuses available from Element as follows: V Operation (North America) 0V Operation (Australia/Europe) Model Fuse Rating Element Fuse Rating Element AMC0 TA T00mA AMC0 T.A 9 T.A AMC0 AMC0P TA 0 TA 8 AMC0 AMC0P T8A TA 0 AMC0P All fuses are Cooper Bussman 0VAC rated, slow-blow ceramic HRC type M0 cartridge. All future production models will be fitted with these fuses. Procedure. Remove the mains lead from the amplifier.. Remove the fuse holder drawer that is part of the IEC mains input socket.. Remove the two existing fuses (one of these is a spare fuse).. Install two M0 size fuses as per the operating voltage above.. Reinstall the drawer. Page of