AMC MMA-120 Guide

PA AMPLIFIER
MUSIC SOURCES
Installation and User Instructions
PU S LI C A DD R ESS A MP LI FIE R W IT H SO UR C E
0 d B
- 6
- 20
Z O NE 2Z O NE 1
Cover Models:
P. A. Amplifier Amplifier with Tuner and CD player
．MMA-120 ．MMS-120
．MMA-240 ．MMS-240

1
WARNING:THIS APPLIANCE MUST BE EARTHED
RISK OF ELECTRIC SHOCK
DO NOT OPEN
IMPORTANT
The wires in the mains lead are coloured
in accordance with the following code:
GENERAL INSTALLATION
DO NOT run microphone cables near mains, data, telephone or 100V line cables.
DO NOT run 100V line cables near data, telephone or other low voltage cables.
DO NOT exceed 90% of the amplifiers output power when using 100V line (speech only).
DO NOT exceed 70% of the amplifiers output power when using 100V line (high level
background music).
DO NOT use re-entrant horn loudspeakers for background music unless the loudspeaker has
been specifically designed for this purpose.
AVOID jointing the microphone cable, when this is unavoidable make sure a good screened
connector is used, e.g. XLR.
ALWAYS use a balanced or floating low impedance microphone terminating into a balanced
input on long microphone cable runs.
ALWAYS use a mains grade double insulated cable for the loudspeaker cable runs.
ENSURE that all loudspeakers are in-phase.
ENSURE that there are no short circuits on the loudspeaker line before connecting to the
amplifier.
Green and Yellow: Earth (E)
Blue: Neutra (N)
Brown : Live (L)
As the colours of the wires in the mains lead of this
apparatus may not correspond with the coloured
markings identifying the terminals in your plug proceed as
follows:
The wire which is coloured green and yellow must be
connected to the terminal which is marked by the letter E
or by the safety earth symbol or coloured green and
yellow. The wire which is coloured blue must be
connected to the terminal which is marked with the letter
N or coloured black. The wire which is coloured brown
must be connected to the terminal which is marked with
the letter L or coloured red.
If a 13 Amp (B.S.1363) plug or any other type of plug is
used,a 5 Amp fuse must be fitted either in the plug or at
the distribution board.

2
FRONT PANEL Mixer Amplifier with music sources
PUBLIC ADDRESS AMPLIFIER WITH MUSCI SOURCE
0 dB
- 6
- 20
ZONE 2ZONE 1
1 2 3 4 5 6 7 8 9 10 11
232221201918171615141312
1. Mic1 input (6.3mm phone jack/balanced).
2. Mic1 volume control.
3. Mic2 volume control.
4. Mic3 volume control.
5. Mic4 volume control.
6. Music Source Select (AUX/TUNER/CD-TAPE/OFF).
7. Line (Music Source) volume control.
8. Master tone control (Bass).
9. Master tone control (Treble).
10. Master volume control (all inputs except TEL).
11. Power ON/OFF switch.
12.VU meter (LEDs for -20, -6, 0dB)
REAR PANEL
ZONE1
115V~ 230V~
ZONE2
COM 100V
ANT MOH OU TPUT TEL
1W
AMFM
MUTE G COM HOT600 1V 8
MIC-3 MIC-2 MIC-1MIC-4
BALANCED
LINE OUT AUX
R
L
LINE FUSE
250V T 2.5A
COM 8 25V 70V 100V+24V 0
DC INPUT
COM 100V
14 15 16 17 19 20 21181312119 10
1 2 3 4 5 6 7 8
1. 24V dc power supply terminals.
2. Loudspeaker output terminals(8Ω/25V/70V/100V)
3. Earth connection screw.
4. FM antenna input.
5. AM antenna input.
6. MOH (music on hold )output terminals.
7. Manual muting terminals
8. TEL input terminals.
9. Zone 1 loudspeaker output terminals.
10. Zone 2 loudspeaker output terminals
11. Mains input socket.
12. Mains voltage 115v/230v switch.
13. AC fuse holder
14. Line output (2×RCA phono).
13.Tuner display.
14.Memory keys.
15.AM/FM selection key.
16.Frequency up/down key.
17.Scan key.
18.Set memory key.
19.Shift key.
20.CD or Cassette player unit built in slot.
21.Zone 1 select switch button.
22.Power on indicator LED.
23.Zone 2 select switch button.
15. Auxiliary input (2×RCA phono ).
16. Mic-4 input (XLR/balanced with selectable phantom
power).
17. Mic-3 input (XLR/balanced with selectable phantom
power).
18. MOH output level control
19. Mic-2 input (XLR/balanced with selectable phantom
power).
20. TEL input level control
21. Mic-1 input (XLR/balanced with selectable phantom
power).

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CD PLAYER UNIT
1.CD display.
2.Repeat key.
3.Folder key
4.Program key.
5.Power on/off key.
6.Previous key.
7.Next key.
8.Play/pause key.
9.Stop/eject key.
CASSETTE PLAYER UNIT
1. Eject control.
2. Cassette slot.
3. Direction indicators
4. Fast wind controls.
6
3
3
2
1
3
2
1
3
2
1
3
2
1
AM
FM
M.C.U
LCD
KEY PAD
Serv0
Drive
M.C.U
LCD
KEY PAD
VOX
PHANTOM
POWER
Priority
Priority
CHIME
TONE MASTER Priority
VOX
VU
100V
70V
25V
8ohm
G
ZONE1 ZONE2
POWER
SWITCH
115V/230V
DC24V
+B
600ohm
1v
8ohm /1W
TO M.O.H
Revision
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DrawnBy :File: PA5000RD
Size
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Date: 5-Jun-2002
Title

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ZONE1
115V~ 230V~
ZONE2
COM 100V
ANT MOH OUTPUT TEL
1W
AM
FM
MUTE G COM HOT
600 1V
8
MIC-3 MIC-2 MIC-1MIC-4
BALANCED
LINE OUT AUX
R
L
LINE FUSE
250V T 2.5A
COM 8 25V 70V 100V
+24V 0
DC INPUT
COM 100V
GND
GND
Mains Connection
The supply transformer has been designed for use either 115Vac or 230Vac,
Selected by slide switch on rear panel. The amplifier is factory set at 230Vac mains
Voltage.
Battery Connection(24Vdc)
When using external batteries, earth the amplifier via the screw terminal because of the high
voltages present. Electrical stability of the system is increased by earthing the case.
NOTE: The connection cable must be fitted with an in-line fuse, quick blow type
F15A. When connecting batteries please ensure correct polarity.
Microphone Connections
Mic1 input is either a balanced standard 1/4” stereo jack on front panel or XLR on the rear
panel (With selectable phantom power). Wiring is as follows:
XLR (Balanced Operation)
Pin1:Screen
Pin2 : Signal (live)
Pin3 : Signal (return)
1/4” Stereo Jack Plug
Tip : Signal (live)
Ring : Signal (return)
Sleeve : Screen
Mic1 input has VOX priority which will override Mic2-4 and Aux (Line) input signals but NOT
the TELEPHONE input.
Mic2-4 inputs are XLR with selectable phantom power located on the rear panel and wired as
above. The phantom power is factory set to off and can be enabled as follows:
21
3

5
1. Remove power lead from the AC wall socket.
2. Remove top cover.
3. Locate the link pins (Marked jump 1,2,3 & 4) on the PCB behind each microphone XLR
input socket.
4. Connect the black shorting plug to the centre pin and ON position to enable the Phantom
power
Chime
Switching the manual muting terminals on the rear panel will activate the chime function
(“Ding-Dong” attention signal preceding a call).The default volume of the chime is pre-set at the
factory and is adequate for most applications).
Telephone Connection
This input is for emergency announcements/signals and is not effected by the master volume
control. Input level can be set by rotary control on the rear panel. The TEL input has the highest
priority and will override all other inputs.
MOH (Music On Hold) Output Connection
Two MOH output are provided on the rear panel.
(i) 600Ω/1V. to feed an EPABX system. Output level adjustable Please consult your EPABX
handbook to utilise this facility.
(ii) 8Ω, 1W for monitoring applications.
Aux (Line) Connection
The equipment provides an auxiliary input which may be used for connecting other signal
sources such as a Radio Tuner, CD or Cassette player. Line level Control is shared with the
built-in Turn and CD. A rotary switch is located on the front panel for selection of Tuner,
CD/Cassette, Aux and OFF. The line level control operates on each of the input sources. To
operate select the desired music source using the rotary switch and turn the “Line “control
clockwise to increase the volume or anticlockwise to reduce the volume.
The Aux input sockets are standard RCA phono, two sockets are supplied and these are linked
together internally, this allows stereo signal source to be used without the need to obtain a
special lead, however you may wish to check with the manufacturer of the signal source to
ensure that no damage will result if the left and right output channels are put in parallel.
RCA Phono plug connection
Sleeve - Screen
Pin - Signal

6
Line Output Connection
This equipment provides two booster output sockets which can be used to drive a booster
amplifier in situations where more power is required. Connection is via RCA phono pluge. (See
above)
Loudspeaker Connection
This equipment provides four different types of loudspeaker output, these are 100V, 70V, 25V line
and low impedance, you can only use one of these output at any one time, any attempt to use two
or more of these may result in damage to the amplifier.
100V Line
These loudspeakers are most commonly used in the Europe for PA distribution. When the
amplifier is at full output 100V RMS will be present at the output terminals. Only use 100V line
loudspeakers with this output. All loudspeakers are wired in parallel and the sum of the power
tapping of each loudspeaker must not exceed the rated output of the amplifier, Ideally, due to the
nature of loudspeaker and transformer impedance’s. it is advisable not to load the amplifier to
greater than 70% of its rated output when using music sources.
Zone 1 & 2
In addition to the normal 100V line output there are two sets of 100V line terminals for 2 zones
which can be selected using the push buttons on the front panel
70V / 25V Line
This system is common in the USA, it operates on exactly the same principals as 100V line
except that at rated output the amplifier will have 70V RMS or 25V RMS on its output terminals.
Low Impedance (8Ω)
This output allows connection of standard low impedance loudspeakers, the minimum load
impedance must be 8Ω, when two or more loudspeakers are used ensure that they are wired in
such a way that the load impedance is between 8Ωand 16Ω.
CD OPERATION
1. Select CD mode with LINE select switch.
2. Press POWER key on CD player
3. Load disc (label side up) into player and PLAY starts automatically.
4. Press PAUSE key and symbol ll appears on the display and play is suspended.
Press pause key to resume play.
5. Pressing key selects the next track and key the previous track
6. Press the FOLDER key, FOLDER appears on the display and press the CD previous key or the
CD next key.

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7. By repeatedly pressing the CD repeat key you select the following modes:
-Playing all tracks and stop.
-Repeating the current track. The display shows ‘1’.
-Repeating all tracks within the current folder. The display shows‘ ’.
-Repeating all tracks. The display shows‘ ’.
-Random playing of tracks in all folders). The display shows ‘RANDOM’.
8. Programming the CD player – in STOP mode.
(i) Press the PROGRAM key
(ii) Use the next or previous key to select a track.
(iii) Press REPEAT key to memorise the selected track in your program. Repeat stages (ii)
and (iii) to program a maximum of 20 tracks.
(iv) Press the PLAY key to start the program (Note: The program repeats itself until the CD
player is stopped).
TUNER OPERATION
For FM reception connect a dipole aerial using 75Ωcoaxial to the socket at the rear of the unit.
Connect the supplied antenna to the AM spring loaded terminals.
1. Select TUNER mode with the Line select switch.
2. Select AM or FM with the BAND key.
3. Use the UP/DOWN keys to set a frequency manually or the SCAN key to automatically
search for the desired station.
4. To program a station press the ME (Memory) key.
5. Press a MEMORY key (M1 to M5) or SHIFT key and memory key (M6 to M10) to store a
frequency.
Operation The Cassette Player
The cassette mechanism fitted into the cassette module is an auto-reverse type which detects
when the end of the tape has been reached and will automatically reverse the direction of the
tape and play the opposite side of the cassette, this function will continue until the cassette is
removed from the module.
NOTE: Due to the abrasive nature of cassette tapes some oxide from the tape will be deposited
on to the cassette mechanism and therefore the mechanism will need cleaning at regular
intervals. Cleaning cassettes can be purchased from most good hi-fi stores. DO NOT use C120
cassettes.
Inserting a cassette
The cassette should be inserted edge first with the exposed tape on the right-hand side, push the
cassette into the mechanism until the cassette drops into position.
Removing the cassette
Firmly press the eject button, the cassette will be ejected.
Fast Wind
The cassette can be fast wound in either direction to any position on the tape by pressing one the
of the fast wind buttons.
Direction Change
The side of the cassette currently playing can be changed to play the other side of the cassette at
any time by pressing both fast wind buttons simultaneously.

8
Technical Specifications
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Outputs Speaker outputs: MOH output :
8Ω,25V,70V,100V 8Ω1watt / 600Ω,1V balanced.
Line out:600Ω,1V
Inputs Mic1:250Ω,1mV,balanced with phantom power selectable (Jump 1)
Mic2:250Ω,1mV,balanced with phantom power selectable (Jump 2)
Mic3:250Ω,1mV,balanced with phantom power selectable (Jump 3)
Mic4:250Ω,1mV,balanced with phantom power selectable (Jump 4)
Aux:47KΩ,200mV,unbalanced.
TEL: 0.1~1V,600Ω,adjustable, balanced
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Signal to noise ratio All Volume Controls C.C.W : 75dB below rated power.
Mic1~Mic4:60 dB below rated power
Aux:70 dB below rated power
TELl:70 dB below rated power
Tone Controls Bass : ±10 dB at 100HZ
Treble: ±10 dB at 10KHZ
Controls Mic1~Mic4 volume control
Line(Aux/Tuner/CD/Cassette) volume control
Master volume control
TEL input level control
MOH output level control
Tone controls (Bass,Treble)
Zone1.Zone2 push bottom
AC 115V / 230V Voltage Selector Switch.
Indicators Power indicator (LED),output level meter (3 LEDS)
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Chime Two tone chime (Ding-done attention signal preceding a call).
Priority Priority level (Using for Mic1~5, the 5-pole DIN connector or phone jack)
TEL / Emer Mic1 Mic2 Mic3 Mic4 Aux / Tuner/ CD-Tape
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Mounting options Table top or, 19” rack mountable
Module Option CD5: CDplayer unit
TM-3 : AM / FM Digital Tuner Unit