AMC+30 MIXER AMPLIFIER
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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 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.. 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.. 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 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 00 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 ohm ohm 0ohm 00V (0/0V version) ohm ohm ohm 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 ATC 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 ) AWG(0.mm ) AWG(.mm ) Over 00m AWG0(0.mm ) AWG(0.mm ) AWG(.mm ) AWG(.mm ) 0V Up to 0m AWG(0.mm ) AWG(0.mm ) AWG(0.mm ) AWG(0.mm ) 0m 00m AWG0(0.mm ) AWG(0.mm ) AWG(.mm ) AWG(.mm ) Over 00m AWG(0.mm ) AWG(.mm ) AWG(.mm ) AWG0(.0mm ) ohm Up to 0m AWG(0.mm ) AWG(0.mm ) AWG(0.mm ) AWG(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 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 > 0dBr >dbr POWER BANDWIDTH (-db db) Hz-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 A 0A (x) OUTPUT REGULATION 9% 9% 9% 90% SIZE (WXHXD) x x 90mm x x mm x x mm x x mm 9 x. x. 9 x. x. 9 x. x. 9 x.. NET WEIGHT.0kg.kg 0.kg.kg.lb.lb.lb.lb SHIPPING WEIGHT.kg 0.kg.kg kg.lb.lb.lb 0.lb SHIPPING DIMENSIONS (WXHXD) 0 x x 9mm x x mm x x mm x x 0mm 0. x. x. 0. x.9 x. 0. x.9 x. 0. x. x. MAINS CURRENT DRAW (0V) FULL POWER 0.A 0.A.0A.A / POWER 0.A 0.A 0.0A.A / POWER 0.A 0.A 0.A.0 IDLE 0.0A 0.A 0.A 0.A MAINS CURRENT DRAW (V) FULL POWER 0.A.A.0A.A / POWER 0.A 0.9A.A.A / POWER 0.A 0.A.A.0A IDLE 0.A 0.A 0.A 0.A THERMAL OUTPUT (W) FULL POWER W W W 9W / POWER W W W W / POWER W W 9W W IDLE W 9W W W THERMAL OUTPUT (BTU/HR) FULL POWER 0 9 / POWER 0 / POWER 90 IDLE 9 9 */ and / 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 Private Bag 9 Silverwater NSW Phone: (0) 9 Fax: (0) nsw@audiotelex.com.au / Middleborough Road Box Hill VIC PO Box Blackburn South VIC 0 Phone: (0) 990 Fax: (0) vic@audiotelex.com.au Commercial Road Fortitude Valley QLD 00 PO Box Fortitude Valley BC QLD 00 Phone: (0) Fax: (0) qld@audiotelex.com.au Walsh Street Thebarton SA 0 PO Box Hindmarsh SA 00 Phone: (0) Fax: (0) sa@audiotelex.com.au / Howe Street Osborne Park WA 0 PO Box Osborne Park BC WA 9 Phone: (0) Fax: (0) 9 wa@audiotelex.com.au 9C Piermark Drive Albany 0 New Zealand PO Box 00- Albany 0 Phone: (09) 9 Fax: (09) 9 sales@audiotelex.co.nz EUROPE / ASIA / MIDDLE EAST INTERNATIONAL SALES Clyde Street Silverwater NSW Australia Private Bag 9 Silverwater NSW Phone: 9 Fax: 9 international@audiotelex.com.au
14 RCA RCA P TAPE OUT R0 K A XLR XLR-FEMALE RCAA RCA-POLE L G R R R9 R 0K R 0K R 0R R 0R C 0/ NP C9 0/ NP C 0/ NP C 0p R R C 0p ICB LM C0 u R9 0R C.u R K C u CN GRD AG(/ ) CH OUT CH OUT CH OUT CH OUT MIX OUT MIX OUT 9 TAPE OUT 0 CON0 A B G XLR XLR-FEMALE RCAB RCA-POLE L R R0 R R 0K R 0K R 0R R 0R C 0/ NP C 0/ NP C 0/ NP C 0p C R9 R0 0p ICA LM 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 0R R 0R C 0/ NP C 0/ NP C 0/ NP C 0p R R C 0p ICB LM 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 0R R 0R SWA P/P C 0/ NP C 0/ NP C9 0p R C0 0p ICB LM C u REV REVISION NOTE: DRN DATE A B C D Added th channel & P/P CKW /0/0 E F AUSTRALIAN MONITOR DRAWING No: SIL//09 DESCRIPTION: AMC 0/0/0 MIC INPUT DATE: DRAWN BY: SHEET of D
15 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 AMC0 Power Amp SIL// CN C 0n C 0p T C T C T A T A T A T A T BD9 T C0 R E R E R 00E R 00E R 0E R k D N D N R0 K R K R K C uf/ C PF R k R9 0E C 00/ D N00 R 00E R K R K R 00E R E PR K R 0E T C T A T0 A0 T9 C D N00 D N00 D N00 D N00 R 0R R 0R R E R E R E R E R9 0E R0 0E T TIP T TIP R 0.E/W R 0.E/W R9 0E/W R 0E/W D9 N00 D N00 R0 0E/W L mm/t PRIM E 00V C0 0.uF/00V C 0.uF/00V F? A S/B F? A S/B M -M D0 N0 D N0 D N0 D N0 CN CON C 00uF/V C 00uF/V -M M C 00/ C 00/ R k C / C9 / M COM COM C 0PF/0V R 0E C 0u/0V Added output cap CKW 0/0/0 Increased gain, R,,,C CKW /0/0
16 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 C n C9 00P VR 0k VR 0k R k R k R 0k R 0k R0 0k R 0k C u C 0pF C u VR 0k R k R k VR 0k VR 0k VR 0k R R 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 R k R 0K R Signal Signal 0E R TO AMP TO AMP C.u C.U R 0K R 0K C9 /V 9 0 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 C ICA LM ICB LM ICA LM ICB LM ICB LM ICA LM D BAV D VW C0 0/ D.9v D.9v / R 0K R K k R T C T C D BAV 00k R X Tone Module Input 0k R u C T BC k R9 0k R 0k R0 TAPE OUT T C R K 0k TAPE OUT Changed to channels CKW /0/0 VR 0k R9 k k R T C CH Changed gain R k->k, C 0p->00p, R9 k-> CKW /0/0 G
17 D D C C B B A A Title Number Revision Size B Date: //0 Sheet of File: \\..\AMC0 ().SCH Drawn By: CN C 0n C 0p T C T C T A T A T A T A T BD9 T C0 R E R E R 00E R 00E R 0E R k D N D N R0 K R K R K C uf/ C PF R k R9 0E C 00/ D N00 R 00E R K R K R 00E R E PR K R 0E T C T A T0 A0 T9 C D N00 D N00 D N00 D N00 R E0E R 90E R E R E R E R E R9 0E R0 0E T TIP T TIP R 0.E/W R 0.E/W R9 0E/W R 0E/W D9 N00 D N00 R0 0E/W L mm/t PRIM E 00V C0 0.uF/00V C 0.uF/00V F? A S/B F? A S/B M -M D0 N0 D N0 D N0 D N0 C 00uF/V C 00uF/V -M M C 00/ C 00/ R k C / C9 / M COM COM C 0PF/0V R 0E C 0u/0V 0V T TRANS S SW-DPDT F C F 0V T0.A V TA.V GND.V 0V/VAC
18 AMC0 AMP-C J O/PTXFR O/PTXFR CT P/S TXFR CN C J CN C R C J C T D C C0 R9 R R0 J T PR C T R D D D T R R R R R R9 R R R R R0 R R R0 R R R R R R9 R R R R R R T0 T F F D C C C C9 J9 J0 J J T9 T T D D D D9 C C C T T T T D D D D0 J R T J C N/P A9
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 J VR VR T R K X VR VR VR VR VR T T T R R R0 R9 R R R R R R R R0 R9 R R R R R R R R9 R R R R R R R R0 R 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 C C C C C R0 R C IC T C T R R9 J J J J J0 J0 J9 J J J J J J J J J J J J
20 Phantom Power RCA XLR XLR XLR R R R R R R IC R R R9 R0 R R R R R R R R C J IC C C C C C C C0 C C9 J C C0 J C C C C C C C 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 C R R R R C C XLR C S J J R R R9 R0 R R A9 AMC input-e
21 TEST PROCEDURE MODEL AMC0. Perform physical inspection (Visual Inspection stage).. Check: All screws for tightness (esp. transistor bolts), Capacitors for polarity, Earth connection for good contact (XLR GND to AC earth), Power transistors for shorts to heatsink, All wiring points for good contacts (soldering and crimping) PRETESTING PRE TESTING SETUP REQUIREMENT a b c d e Oscilloscope. Variac. Multimeter. Load [Ω] Signal generator.. Set up amplifier for test (Pretesting stage)... Check AC fuses (0.A), 0mm HRC DC fuses (.A QA), 0mm.. Connect amplifier to: Variac (0Vac), Signal generator (mic, no signal), Resistive load ( Ω on Ω terminal )... Reset controls: Volume controls to minimum, Bass/treble control to center, PR (presets) Amplifier PCB fully anticlockwise.. Power up. Turn on power switch and adjust voltage to 0VAC. Watch current meter for excess current draw. Current should not exceed 0.A.. Check DC power supply at fuses. Should be approx. V (±.V). Check DC voltage on mixer board. Should be approx. V(±0.V). Check / on mixer board should be. VDC (± 0.). Measure DC voltages on IC of mixer & input PCB's, p V (%), p 0V (00mV), p.v (± %).. Put a multimeter across R the meter read 0mV then slowly adjust the preset PR so that you get.mv Check Quiescent Vtg across all Emitter resistors.. AC Check. Set signal generator to mv. Turn up Mic volume control to full. Watch for irregularities with output.. Set output to V using master volume control. Check voltage across Emitter resistors (on power devices)
22 . Voltage should be between 0 00mV. Min and max values should be between % of the average value (i.e. min/max=0.).. Turn master up to full. set sensitivity of mike input to mv.. Check the output of all channels should be V (± 0.V).. Check 00V(±V) at 00V terminal.. Check tape outputs (L and R) 0mV (mv) (Measure on RCA socket).. Check line outputs. Approx. (.V ± 0.V)..9 Check Tone Module. Requirements for final testing a. Neutric. b. Load 0Ω. c. Oscilloscope d. Microphone e. Variac FINAL TESTING Performance Test.. Check Noise should be less then 0mV (all pot mid) i.e. S/N >0dBr. Check mike sensitivity (CH-CH) = mv out put =00V (± V). Check AUX sensitivity (CH-CH)= 000mV out put =00V (± V). Check the Power bandwidth (Hz ±Hz KHz ± KHz).. Check Bass 00HZ = db (TOL db) and 0kHz = 9.dB (tol.±db). Check that input signal and output signal are in same phase by comparing CH AUX Input and all other Outputs (Ω, 00V ) Priority check. Plug microphone into input and oscillator to input. Check for muting of channel.. Make Disable/Enable link to disable position Check that CH does not mute CH.Return Disable/Enable link to Enable position Over load Test. Make Output Load 0E Increase the signal till you get % the output VTG should be V - V.. Keeping the signal ON, short the output for one Sec and remove, the output should drop and return back without any distortion or damage to any components. Make the output loads normal to 0E.. Reset volumes to minimum.. Disconnect from test bench and inspect for scratches on external paint. Factory setting of links: a. VOX Muting: Enable b. All pot Center LISTENING TEST 0 Insulation test and High voltage test to be carried out as per UL Standard Procedure. Requirements for Listening Test Setup : a. CD Player b. Speaker
23 c. Microphone Listening test. Keep all pot full tone at center, switch ON the set and check for ON thump and also check that no low frequencies are audible. Make all Channel Pots minimum.. Check CD Player (AUX) output for all channels and tone control for all channels.. Check Priority function: CH over CH &. Short the output with signal ON Signal should mute and return back
24 AMC Parts Circuit boards Part Number Factory code Input board AMCIB Mixer board AMC0MB B00 AMC0 output board AMC0OPB B00 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
25 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 AMC0 AMC0P TA 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
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