M&S Systems DMC3-4 — Intercom & Music System Operation Guide

Complete operation and user's guide for the M&S Systems / Linear DMC3-4 System Master — an intercom and music distribution system with optional built-in CD/MP3 player, supporting up to 15 room/patio stations and 3 door stations.

Overview

The DMC3-4 is an intercom and sound system for the home, combining whole-house intercom with AM/FM radio and, with the optional DMCMP3 CD/MP3 Player, playback from CDs and portable music devices. It consists of three major components:

• Master Station — contains the central control electronics, radio receiver, and optional CD/device player; usually installed in the kitchen or another central location.
• Room & Patio Stations — up to 9 Room Stations in individual zones, or 15 Room Stations in shared zones on a 4-wire (M&S Systems retrofit) installation, and 13 Room Stations in shared zones on a 3-wire (NuTone retrofit) installation, including 2 Patio Stations.
• Door Stations — up to 3 can be installed at entry doors.

Safety Warnings

• Risk of electric shock — do not open. No user-serviceable parts inside; refer servicing to qualified personnel.
• The DMC3-4 must be installed by trained dealers or installers and must conform to all local building and electrical codes.
• Do not expose the DMC3-4 to moisture — this can create fire or shock hazards and will impair the warranty.
• Do not expose Patio Stations to direct water spray.
• Do not attempt to service this product yourself — opening or removing covers may expose you to dangerous voltage and will invalidate the warranty.
• Use only M&S Systems replacement parts, installed by an M&S Systems dealer/installer — unauthorized substitutions can cause fire, electric shock, or void the warranty.
• Clean stations and speakers with a dry cloth only — never liquid or aerosol cleaners.

Master Station Controls

The Master Station front panel includes: AUTO button (toggles Auto Music feature), TIME button (sets clock and music on/off time), PRESET button (sets AM/FM presets), Station Mode Switches (behind a hinged cover — see below), TUNE buttons (tunes AM/FM stations), Display (shows time and operating info), POWER button (turns music on/off — intercom stays on regardless), TONE button (selects volume/tone settings), INTERCOM buttons (talk/listen to other stations; press both to talk to a door station), VOLUME buttons (change volume, adjust tone/time settings), SPEAKER (for music and intercom), and SOURCE button (selects music source).

Station Mode Switches

Behind a hinged cover on the left side of the Master Station are 11 slide switches that determine how the Master Station and each intercom station functions — called the "Station Mode." Each switch is numbered to label the corresponding Room Station's location. When a system has more than nine Room Stations, some switches control two Room Stations.

System Setup

Display brightness (3 levels: low/medium/high): simultaneously press TUNE ▲ and POWER repeatedly to cycle through levels.

Clock settings: Press TIME to set current hour (VOLUME ▲/▼ to adjust, AM/PM indicated by A/P), TIME again for minutes, then continue pressing TIME to step through Auto On Time hour/minute and Auto Off Time hour/minute. Press TIME again to return to the current time display.

Scan Mode: simultaneously press and release PRESET and SOURCE to toggle between Scan Mode 1 (scans AUX → AM presets 1-8 → FM presets 1-8 → CD) and Scan Mode 2 (same source order, but scans all strong AM/FM stations rather than just presets before moving to the next source).

Music Auto On/Off: set the Auto On/Off times under Clock Settings, then press AUTO to toggle the feature on/off (the display shows "AUTO" when active).

Audio Settings

Press TONE repeatedly to cycle through each setting, then use VOLUME ▲/▼ to adjust:

• Music Volume — 0-29, varies by source selected
• Treble — 0-14
• Bass — 0-14
• Master Station Volume — 0-29 (intercom volume through the Master Station speaker only)
• Loudness — On/Off; boosts bass at low listening levels
• Intercom Volume — 0-29 (sets audio level from the Master Station out to Room, Door, and Patio Stations)

The system returns to normal operation 5 seconds after the last setting is changed.

Operating the Intercom

• Intercom Talk: Press TALK and speak — reaches all stations set to INTERCOM or RADIO/INT. Press LISTEN (or they press TALK) to hear a response.
• Intercom Listen: Press LISTEN to hear other INTERCOM/RADIO-INT stations; press TALK to respond.
• Intercom Monitor: Set a station's mode switch to MONITOR to have it continuously heard by all RADIO/INT stations — useful for baby rooms, play rooms, or elder care.
• Monitor Override: Press and hold AUTO + POWER together to toggle "MO" ON/OFF on the display. When ON, MONITOR-mode stations can hear incoming talk from other rooms; when OFF they can't hear any intercom communication or the door chime.

Door Station Operation

Pressing the button on a Door Station sounds the chime on all stations set to INTERCOM or RADIO/INT and mutes all system audio (music and intercom) while it rings. If the Door Station is already in a talk/listen session, the chime is disabled until that session ends.

• Door Talk/Listen: Press TALK and LISTEN together (Master, Room, or Patio Station) to enter Door Talk Mode and speak to the visitor. Release both buttons to enter Door Listen Mode, active for 25 seconds — press TALK+LISTEN again anytime to re-engage. Releasing either button individually suspends Door Talk mode.
• Door Release/Security Option: An optional feature your installer can wire to control a door release mechanism, lighting, or an alarm. Press and hold VOLUME ▲ and VOLUME ▼ together for ~5 seconds — the display shows "RELEASE" while both buttons are held; release them to stop the output. Available from the Master Station and remote-scan Room Stations only (not Patio Stations, for security reasons).

Room & Patio Station Operation — 4-Wire (M&S Systems retrofit)

• Station Volume: adjust the SPEAKER VOLUME knob
• Intercom Listen: press the LISTEN button
• Intercom Talk: press the TALK button
• Door Talk/Listen: press TALK and LISTEN together; release to listen for 25 seconds
• Door Release/Security Option: press and hold VOLUME+ and VOLUME- for ~5 seconds (not available from Patio Stations)

Room & Patio Station Operation — 3-Wire (NuTone retrofit)

• Station Volume: adjust the SPEAKER VOLUME knob
• Intercom Talk: press the ROOM TALK button
• Door Talk/Listen: press DOOR TALK to talk; release to listen for 25 seconds
• Door Release/Security Option: press and hold VOLUME+ and VOLUME- for ~5 seconds (not available from Patio Stations)

Playing Music — Master Station

Music sources: AM (530-1710 KHz), FM (87.5-107.9 MHz), CD (optional built-in CD/MP3 player), and AUX (any source connected to the optional Audio Input Wall Plate). Press SOURCE repeatedly (with POWER on) to cycle through sources.

Radio tuning: Press and release TUNE ▲/▼ within 1 second to enter Seek Mode (finds next strong-signal station); press and hold to Scan Mode (scans all frequencies until released — slow for the first 2 seconds for fine-tuning, then fast).

Setting radio presets (up to 8 each for AM and FM): Select the band with SOURCE, tune to the desired station, then press and hold TUNE ▲ and TUNE ▼ together for 5 seconds to enter Store Preset Mode; the display shows the preset number being saved. Use PRESET to cycle to a specific preset number if needed. Cancel anytime by pressing TUNE ▲/▼ together again.

Tuning to a preset: Select AM or FM with SOURCE, then press PRESET to step through saved presets (the preset number shows on the display).

Playing Music — Room & Patio Stations

• Turn the Music Source on/off: press MUSIC VOLUME+ (on) or hold MUSIC VOLUME- until volume reaches zero (off)
• Adjust system-wide music volume: press VOLUME+ or VOLUME- from any Room/Patio Station
• Adjust this station's own volume: use its SPEAKER VOLUME knob
• Switch music sources: press VOLUME+ and VOLUME- together at the same time

Room/Patio Stations cannot select specific CD tracks or remotely control a portable MP3 player — those are controlled directly on the player itself.

Optional DMCMP3 CD/MP3 Player

Installs below the Master Station and supports four source types: generic portable MP3 players via a 3.5mm audio input jack (plus a USB port for charging, cable not included), standard music CDs, and MP3-format CD-ROMs burned on CD-R/CD-RW media.

Playing from a portable MP3 player: select CD as the source, extend the device drawer, connect the player's headphone jack to the drawer's 3.5mm input via the supplied cable, set the player on the rubber tray, optionally connect USB for charging, then control playback and volume directly on the MP3 player itself (Master Station buttons don't control it — set the player's own volume to about mid-level and use the Master/station volume controls for overall level).

CD play modes (cycled with the MODE button): Normal (plays all tracks in order), Repeat Song, Repeat Disc, Random Disc (plays once in random order), Random All (continuously plays in random order).

CD playing controls: PREVIOUS TRACK (play previous / restart current track; hold to reverse-scan), NEXT TRACK (play next track; hold to fast-forward; also selects next random track in Random modes), PLAY/PAUSE, MODE (cycle play modes; hold to display total disc time and track count — not available for MP3 CD-ROMs), SOURCE/EJECT (press to switch between CD and audio input jack; hold to eject the disc).

Warranty

2-Year Limited Warranty from Linear LLC. The warranty period begins at purchase or installation, or at closing on a new residence where the product was originally installed, and extends to the original user and each subsequent owner during the warranty term. Linear will repair or replace parts at no charge (parts may be new or rebuilt). Call the toll-free service number before dismantling the product — dismantling prior to calling may void the warranty. Obtain a Return Product Authorization (RPA) number before returning anything; unauthorized returns will be refused. Excludes damage from improper installation, acts of God, criminal acts, code violations, or non-recommended wiring. Linear's liability is capped at the product's cost; some states don't allow exclusion of incidental/consequential damages, so this limitation may not apply in all jurisdictions.

Support

USA & Canada: (800) 421-1587 or (800) 392-0123 · (760) 438-7000 · Toll-free fax (800) 468-1340 · www.linearcorp.com