Inter-M PAM-480A User Manual

Operation Manual

Public Address Amplifier

PAM-120A/340A/480A

PUBLIC ADDRESS AMPLIFIER

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!

This symbol is int ended to ale rt the user to the

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

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.

Caution: To prevent electric shock do not use this (polarized) plug with

Attentions: Pour prévenir les chocs électriques ne pas utiliser cette

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.”

Service Instructions

*Worded: "Caution: These servicing instructions are for use by qualified service personnel only. To reduce the risk of electric shock, do not

perform any servicing other than that contained in the operating instructions unless you are qualified to do so."

*Location: Instruction Manual.

NOTE : This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These

limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

presence of uninsulated “dangerous voltage” within the product’s enclosur e that ma y be of sufficient magnitude to constitute a risk of electric shock to persons.

This symbol is int ended to ale rt the user to the presence of important operation and maintenance (servicing) instructions in the literature accompanying the appliance.

an extension cord, receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure.

fiche polarisée avec un prolongateur, une prise de courant on une autre sortie de courant, sauf si les lames peuvent étre inséré es à fond sans en lai sser aucune par tie à découvert.

* It can be heated up if you use this product in closed box or ill-ventilated place.

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Contents

Unpacking .......................................................................................................................................2

Installation

Environment....................................................................................................................................2

Important Safety Instructions.............................................................................................................2

Features............................................................................................................................................3

Operation ........................................................................................................................................3

Front Panel ......................................................................................................................................4

Rear Panel .......................................................................................................................................5

Connecting Speakers...................................................................................................................10

Applications ..................................................................................................................................12

Block Diagrams.............................................................................................................................14

Specifications ................................................................................................................................16

Service

Procedures....................................................................................................................................17

Schematic.....................................................................................................................................17

Parts List .......................................................................................................................................17

Variations and Options ...............................................................................................................17

Warranty .......................................................................................................................................17

PAM-120A/340A/480A

UBLIC ADDRESS AMPLIFIER

S3125A

Unpacking

Although your PAM-120A or PAM-340A or PAM-480A 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

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

PAM-120A/340A/480A

Features

- 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 PAM-120A/340A/480A’s audio capabilities.

- INDIVIDUAL INPUT GAIN CONTROLS

Rear-panel gain controls for each input channel for total control of individual levels.

- SPEAKER SELECT

Six speaker select switches enable you to select any combination of up to five speakers.

- SELECTABLE PRIORITY MUTING

Switchable audio signal priority for Channels 1 and 2, Chime and Telephone input over other input sources.

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- REMOTE CONTROL INPUT (only PAM-340A/480A)

Individual speaker zones can be selected and chime can be operated by wired remote control.

- ANNOUNCEMENT CHIME

Convenient four-tone chime for use with announcements.

- EM(EMERGENCY) - OPTIONAL EMERGENCY VOICE IC (only PAM-340A/480A)

When EM switch is pressed in emergencies, EM broadcasting stored in VOICE IC is outputted.

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.

PAM-120A/340A/480A

UBLIC ADDRESS AMPLIFIER

Front Panel

1. TUNER MODULE BAY

This panel provides for installation of optional PAM-T (AM/FM Tuner) Module, via the unit’s internal connectors.

2. CASSETTE DECK AND CD MODULE BAY

This panel provides for installation of optional PAM-CDA (CD Player) or PAM-D (Cassette Deck) Modules, via the unit’s internal connectors.

3. OUTPUT LEVEL DISPLAY

This seven-segment LED meter indicates the amplifier’s output level in RMS.

4. CHANNEL 1-6 VOLUME

Controls the individual volume levels of Channels 1-6.

5. TONE CONTROL

Individual Bass and Treble controls are used to cut (decrease) or boost (increase) the lower and higher frequencies ±12dB.

6. MASTER VOLUME

This rotary switch controls the overall output volume of the amplifier’s output signal.

7. CHIME BUTTON

Pressing this switch activates the chime circuitry.

8. SPEAKER SELECTOR SWITCHES

These switches are used to select output to any combination of up to five individual speakers.

9. 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.

10. 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.

PAM-120A/340A/480A

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