Inter-m PAM-510 User manual

Operation Manual
ATT. Zone Amplifier
PAM-510/520

ATT. ZONE AMPLIFIER
Contents
Contents
Welcome
Warning.........................................................................................................................................1
Unpacking......................................................................................................................................2
Installation
Environment....................................................................................................................................2
Important Safety Instructions.............................................................................................................2
Features............................................................................................................................................3
Accessories.....................................................................................................................................3
Operation ........................................................................................................................................3
Front Panel ......................................................................................................................................4
Rear Panel .......................................................................................................................................6
Connecting Speakers.....................................................................................................................9
Application of the Antenna ........................................................................................................10
Applications ..................................................................................................................................11
Block Diagram ..............................................................................................................................12
Specifications ................................................................................................................................13
Service
Procedures....................................................................................................................................14
Schematic.....................................................................................................................................14
Parts List .......................................................................................................................................14
Variations and Options ...............................................................................................................14
Warranty .......................................................................................................................................14

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PAM-510/520
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Welcome
Welcome
A personal welcome to you from the management and employees of Inter-M
All of the co-workers here at Inter-M are dedicated to providing excellent products with inherently good value,
and we are delighted you have purchased one of our products.
We sincerely trust this product will provide years of satisfactory service, but if anything is not to your complete
satisfaction, we will endeavor to make things right.
Welcome to Inter-M, and thank you for becoming part of our worldwide extended family!
* It can be heated up if you use this product in closed box or ill-ventilated place.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK.
DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
WARNING
To prevent fire or shock hazard, do not
expose the unit to rain or moisture.
*Do not install this equipment in a confined space such as a book case or similar unit.
*The apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such vases, shall be placed on the apparatus.
*Worded: “WARNING FOR YOUR PROTECTION PLEASE READ THE FOLLOWING-WATER AND MOISTURE: Unit should not be used
near water(e.g. near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, etc). Care should be taken
so than objects do not fall and liquids are not spilled into the enclosure through openings.”
This symbol is intended to alert the user to the
presence of uninsulated “dangerous voltage” within
the product’s enclosure that may be of sufficient
magnitude to constitute a risk of electric shock to
persons.
This symbol is intended to alert the user to the
presence of important operation and maintenance
(servicing) instructions in the literature accompanying
the appliance.
Caution: To prevent electric shock do not use this (polarized) plug with
an extension cord, receptacle or other outlet unless the blades
can be fully inserted to prevent blade exposure.
Attentions: Pour prévenir les chocs électriques ne pas utiliser cette
fiche polarisée avec un prolongateur, une prise de courant
on une autre sortie de courant, sauf si les lames peuvent
étre insérées à fond sans en laisser aucune partie à
découvert.

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Unpacking
Although your PAM-510 or PAM-520 is neither complicated nor difficult to operate, we recommend you take a
few minutes to read this brief manual and familiarize yourself with the important information regarding product
features, setup and operation.
As with most electronic devices, we strongly recommend you retain the original packaging. In the unlikely event
the product must be returned for servicing, the original packaging (or reasonable equivalent) is required.
Installation
Installation
Environment
Never place this product in an environment which could alter its performance or reduce its service life. Such
environments usually include high levels of heat, dust, moisture, and vibration.
Important Safety Instructions
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including
amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult
an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and
the point where they exit from the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus.
When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required when the
apparatus has been damaged in any way, such as power-supply cord or plug is
damaged, liquid has been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or has
been dropped. S3125A

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PAM-510/520
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Features
Features
- SPEAKER SELECT(5ZONE SPEAKER OUTPUT)
Six speaker select switches enable you to select any combination of up to five speakers.
- SELECTABLE PRIORITY MUTING
Switchable audio signal priority for MIC Channels 1, siren, Chime and Telephone input over other input
sources.
- MONITOR SPEAKER
You can monitor output signal by using the monitor speaker, and can control the monitor level on front panel
by 3 step lever switch.
- ANNOUNCEMENT CHIME
Convenient four-tone chime for use with announcements.
- REMOTE CONTROL INPUT
Individual speaker zones can be selected and chime can be operated by wired remote control.
- EM(EMERGENCY)
When EM switch is pressed in emergencies, EM broadcasting stored in VOICE IC is outputted.
- REMOTE POWER
You can turn on/off amplifier by remote control.
- INDIVIDUAL INPUT GAIN CONTROLS
Rear-panel gain controls for each input channel for total control of individual levels.
- MODULAR DESIGN
Optional modules can be installed in multiple configurations for convenience and ease of use. Choose the
PAM-CDA (Compact Disc), PAM-T (AM/FM Tuner) or PAM-D (Cassette Deck) modules to expand the
Accessories
One detachable AC power cord is provided for use with this product.
Operation
Operation
Make certain that speakers and input sources are properly connected before switching on.
Keep volume levels turned down before switching on.
NOTE: The system’s operation is delayed by approximately three seconds after pressing the power switch. This is
due to the built-in protection circuitry, designed to protect the speakers and other system components.

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Front Panel
Front Panel
1. MONITOR SPEAKER
You can monitor output signal by using the monitor speaker, and can control the monitor level on front panel
by 3 step lever switch.
These panels provide for installation of optional PAM-CDA, PAM-T or PAM-D Modules, via the unit’s internal
connectors.
2. SPEAKER SELECTOR & ATTENUATOR
These switches are used to select output to any combination of up to five individual speakers.
Attenuator position and output Voltage.
3. TONE CONTROL AND PEAK INDICATOR
Individual Bass and Treble controls are used to cut (decrease) or boost (increase) the lower and higher
frequencies ±12dB. This LED illuminates when the signal approaches clipping. If the PEAK indicator
illuminates continuously flashes often), you should decrease the level of input signal.
4. CHANNEL VOLUME
Controls the individual volume levels of Channels.
5. CHIME
Pressing this button will activate the one shot chime. Depending upon the volume adjustment the level of signal
and mute level are varied.
MIN2345 MAX
Output 6V 8.9V 12.5V 25V 50V 70V(USA/CANADA & Associated)
Voltage 100V(EC & Associated)

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6. SIREN
This is for emergency situation. Depending upon the volume adjustment the level of signal and mute level are
varied.
(~) : Alert siren curve. (repeat)
(–) : Alert siren flat. (continuously)
7. TEL IN
Depending upon the volume adjustment the level of signal and mute level are varied.
8. RINGER
Night ringer function let you hear telephone ring via speaker.
Depending upon the volume adjustment the level of signal and Mute level are varied.
9. MASTER VOLUME
This rotary switch controls the overall output volume of the amplifier s output signal.
10. POWER SWITCH
Pressing this switch turns the unit on, as indicated by the Power LED above the switch. Pressing it again turns
the unit off. When the switch is to off location, becomes the stand-by condition and the STAND-BY LED lights.
11. PROTECTION INDICATOR
This LED indicates the state of the amplifier s protection circuitry. When the Protection LED is on (illuminated),
the protection circuitry is active, indicating that the unit is not operating normally. This is typically due to
overheating or power limiting. Please check the Input and Output condition of the amplifier.
12. OUTPUT LEVEL INDICATOR
These three LEDs indicate the amplifier s output status. The -40dB LED indicates the presence of audio signal
at the amplifier’s output. The -10dB LED indicates output at nominal operating range. The red CLIP LED
indicates an excessive output level. Do not operate the unit with the CLIP LED continuously on (illuminated).

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Rear Panel
Rear Panel
1. SPEAKER OUTPUT TERMINAL
This terminal is for speaker wire connection.
Connect speakers whose combined impedance is equal to or higher than the rated output impedance, as
shown below.
2. NIGHT RINGER
Connect night ringer terminal to telephone line. You can telephone ring Via speaker from other office in the night.
3. TELEPHONE INPUT TERMINALS
These terminals can be connected to a telephone exchange system for paging purposes.
NOTE: When an active signal is sent through the telephone input, all other input signals except for AMP IN
are muted.
4. EXT CHIME
When these two terminals are shorted by wired remote, the one shot chime is activated.
Output 4ΩSPK 1~5
Terminal (LOW IMPEDANCE) (HIGH IMPEDANCE)
Model Name
PAM-510 22V/4Ω(120W) EC & Associated : 100V/400Ω(25W MAX)
USA/CANADA & Associated : 70V/196Ω(25W MAX)
PAM-520 31V/4Ω(240W) EC & Associated :100V/200Ω(50W MAX)
USA/CANADA & Associated : 70V/98Ω(50W MAX)

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PAM-510/520
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5. EM(EMERGENCY)
When EM switch is connected and pressed in fire or other emergencies, EM broadcasting stored in VOICE IC
is outputted. When selected, these switches will give priority to over all other signals inputs.
6. ANTENNA CONNECTOR(OPTIONAL)
This terminal is used to connect the antenna, when used with the optional PAM-T AM/FM Tuner module.
7. PHANTOM POWER SWITCH
This switch turns the phantom power supply on or off for all channels. When the switch is turned on, +24V DC
power is supplied to pins 2 and 3 of each channel’s input connector.
Use phantom power when connecting condenser microphones, which require an external power supply.
NOTE: It is safe to connect most modern dynamic microphones or line level devices to the channel Inputs
when phantom power is activated. However, some older ribbon microphones may be damaged by
phantom power, and certain unbalanced line level devices may malfunction or produce an Audible
hum when phantom power is active.
8. MIC 1 PRIORITY SWITCH
When selected, these switches will give priority to Channels 1 over all other channels inputs.
9. INPUT GAIN CONTROLS(TRIM VR)
These knobs provide continuous control of the input levels for each of the six input channels. When adjusting
the input gain, make certain that the levels are not set too high, or distortion will result.
10. AC POWER INPUT
Connect a standard three-pin AC cable to this connector.
11. DC INPUT TERMINALS
These terminals are provided for the connection of backup battery. Connect a 24VDC 50A battery source to
these terminals. Make certain the red terminal is connected to the battery’s positive (+) side, and the black
terminal to the battery’s negative (–) side.
12. REMOTE POWER
You can turn on/off amplifier by remote control.

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13. REMOTE CONTROL INPUT
By connecting a 15-pin D-SUB connector, it is possible to control speaker zone selection and activate the
chime via wired remote. Connection terminals for the remote are shown below.
14. AMP IN
This input connects an external mixer or preamp with the unit’s power amp. Inserting a plug into the Amp In
jack will disconnect all input signal from the unit’s internal mixer. Only signal from the external source will be
heard.
15. PRE OUT/REC OUT
This output connects the unit with an external devices such as tape recorders or power amplifier.
(OUTPUT LEVEL: REC OUT: -10dB, PRE OUT: 0dB )
16. LINE INPUT CHANNEL 1~2
This line-level input is an extra stereo input for a stereo source such as a tape deck or CD player.
17. MIC INPUT CHANNEL 1~4
This is a special connector which will accept either a 3-conductor XLR or a 3-conductor 1/4” jack. These
inputs are suitable to receive signal from microphones level devices.
Pin 1: Remote amplifier input signal hot(+) Pin 8: Remote control 5(Speaker 5)
Pin 2: Remote amplifier input signal cold(–) Pin 9: Remote control ground
Pin 3: Signal ground Pin 10: DC +24V
Pin 4: Remote control 1(Speaker 1) Pin 11: Input Chime
Pin 5: Remote control 2(Speaker 2) Pin 12: NC
Pin 6: Remote control 3(Speaker 3) Pin 13: NC
Pin 7: Remote control 4(Speaker 4) Pin 14, 15: NC
MIC JACK (XLR JACK) LINE JACK (TRS PHONE JACK)
Pin 1: GROUND Sleeve: GROUND
Pin 2: HOT(+) Tip: HOT(+)
Pin 3: COLD(–) Ring: COLD(–)

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Connecting Speakers
Connecting Speakers
Before connecting speakers, disconnect the AC power cable. Note the proper connecting terminals as shown
below. Make certain that the total impedance is not less than the rated impedance indicated.
- CONNECTING HIGH-VOLTAGE DISTRIBUTED SPEAKER SYSTEMS
NOTE: Be sure that total impedance is not less than rated impedance. (See upper chart.)
WARNING: Extreme care must be exercised when connecting high-impedance systems, as potentially
hazardous voltages may be present at these terminals.
Do not install this equipment in a confined space with less-than-adequate ventilation.
Total rated input of up to 25W (PAM-510) or 50W (PAM-520)
When connecting a high-impedance(70V/100V) speaker system in parallel, you can connect speakers
with a total rated input of up to 25W (PAM-510) or 50W (PAM-520).
Output 4ΩSPK 1~5
Terminal (LOW IMPEDANCE) (HIGH IMPEDANCE)
Model Name
PAM-510 22V/4Ω(120W) EC & Associated : 100V/400Ω(25W MAX)
USA/CANADA & Associated : 70V/196Ω(25W MAX)
PAM-520 31V/4Ω(240W) EC & Associated :100V/200Ω(50W MAX)
USA/CANADA & Associated : 70V/98Ω(50W MAX)

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Application of the Antenna
Application of the Antenna
- FM RECEIVING ANTENNA
The electric wave of FM broadcasting is weakening in hills and valleys, around buildings and in iron-
reinforced buildings.
- INSTALLATION OF ANTENNA EXCLUSIVELY FOR FM
Listening to the broadcasting, fix the antenna after deciding the location and the direction so that the reception
may be optimized.
- INSTALLATION OF ANTENNA USING THE COAXIAL CABLE
Noisy reception may occur in built-up areas and factory sites as well as around power cables. This may be the
case even when an antenna is used exclusively for FM. In these regions, install the antenna using 75Ωcoaxial cable.
- INDOOR ANTENNA
In the regions where FM broadcasting is heard comparatively well due to the near distance to the station or
wooden structure, you can receive broadcasting of good quality by using T-type antenna.(using matching
trans:300Ω/75Ω)
- AM LEAD ANTENNA
Fix one end of a six to eight metre length of vinyl-coated single cable to the AM terminal and the other end to
a high place like a wall.
- AM OUTDOOR ANTENNA
Install the vinyl-coated cable to an outdoor place if the AM reception is not good enough.
- AM LOOP ANTENNA
Connecting the feeder of the loop antenna of the terminal of 300Ω.
Listening to the broadcasting, fix it after deciding the location and the direction so that the receipt condition
may be optimum.
 

ATT. ZONE AMPLIFIER
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PAM-510/520
Applications
Applications

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Block Diagram
Block Diagram

Amplifier Section Rated Output Power (THD 1%) 120W(RMS) 240W(RMS)
(Amp In@1kHz, Speaker Zone 1~5 Output 25W MAX 50W MAX
4ΩLoad Output) Input Sensitivity/Impedance 1V/20kΩ
S/N Better than 85dB
Frequency Response 80Hz~18kHz
(at 1kHz Half Power Output, ±3dB)
Mic Input Section Input Sensitivity/Impedance –60dBV/600Ω
(Mic 1~4 In@1kHz,
S/N Better than 55dB
Preamp Out) Frequency Response (±3dB) 120Hz~10kHz
Tone Control (Bass:100Hz,Treble:10kHz)
±12dB
Phantom Power +24VDC
Line Input Section Input Sensitivity/Impedance –30dBV/10kΩ
(Line 1~2 In@1kHz,
S/N Better than 65dB
Preamp Out) Frequency Response (±3dB) 80Hz~15kHz
Tone Control (Bass:100Hz,Treble:10kHz) ±12dB
Remote Amp Section
Mic Input Sensitivity/Impedance –60dBV/600Ω
(Remote In@1kHz, S/N Better than 55dB
Preamp Out) Frequency Response (±3dB) 120Hz~10kHz
Tel In Section Input Sensitivity/Impedance 0.3V/600Ω(USA/Canada)
(Tel In@1kHz, 0.775V/600Ω(EC & Associated)
Preamp Out) S/N Better than 65dB
Frequency Response (±3dB) 330Hz~3kHz
Pre Amp Out(Mic 1~4, Line 1~2, Tel In, Remote In) 0dBV/600Ω
T.H.D Less than 0.5%
Record Out –10dBV/3kΩ
Operating Temperature –10°C~40°C
Power Source
100–120VAC or 220–240VAC; 50/60Hz, 24VDC
Power Consumption (1/8 POWER) 180W 320W
Weight 17kg/37.6lb 19kg/42lb
Dimensions 482(W) x 132(H) x 398(D)mm
19(W) x 5.2(H) x 15.7(D)in
* Specifications and design subject to change without notice.
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Specifications
Specifications................................................................*0dBV=1Vrms
PMA-510 PAM-520

14 PAM-510/520
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Service
Service
Procedures
Ensure the problem is not related to operator error, or system devices that are external to this unit. Information
provided in the troubleshooting portion of this manual may help with this process. Once it is certain that the
problem is related to the product contact your warranty provider as described in the warranty section of this
manual.
Schematic
A Schematic is available by contacting your warranty provider.
Parts List
A Parts List is available by contacting your warranty provider.
Variations and Options
Variations and Options
Variations
Products supplied through legitimate sources are compatible with local AC power requirements.
Options
No optional items are available for this product.
Warranty
Warranty
Warranty terms and conditions vary by country and may not be the same for all products. Terms and conditions
of warranty for a given product may be determined first by locating the appropriate country which the product
was purchased in, then by locating the product type.
To obtain specific warranty information and available service locations contact Inter-M directly(in Korea or the
USA) or the authorized Inter-M Distributor for your specific country or region.

MADE IN KOREA
April 2006 9007504510
Inter-M, Ltd. (Korea) began operations in 1983.
Since then, Inter-M has grown to become one of the largest manufacturers
of professional audio and commercial sound electronics equipment in the world.
Inter-M has gained worldwide recognition for its own branded products,
as well as private label manufacturing of electronics sold under other names (OEM).
The company is no longer just a Korean company, but rather a global company
that is truly international in scope, with factories and offices in Korea and China,
and sales and marketing operations located in Japan, Europe, and the U.S.A.
With more than 850 employees around the globe,
Inter-M is well-poised for further growth and expansion.
INTER-M AMERICAS, INC.
1 EAST BEACON LIGHT LANE CHESTER, PA USA 19013-4409
TEL : [phone], FAX : [phone]
Home Page : http://www.inter-m.net, E-mail : [email protected]
INTER-M Corporation
SEOUL OFFICE:653-5 BANGHAK-DONG, DOBONG-KU, SEOUL, KOREA
TEL : [phone]~8, FAX : [phone]
Home Page : http://www.inter-m.com, E-mail : [email protected]