Technics SL-MC409 Compact Disc Changer Service Manual

LINE-UP OF COMPONENTS

The following components are part of the system:

Note: The SB-model speakers and the SH-model rack used with this system have a wood-grain-effect finish.

WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

Technics

© 1996 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.

PLACEMENT

Placement of each unit

Diagram: Illustrates the physical arrangement of system components. Components shown are: Tuner, Amplifier, Graphic equalizer (for SC-S375, S4750 models), Cassette deck, and Compact disc changer.

Note for front/center speakers: These speakers are designed for close proximity to TVs. If irregular coloring occurs on the TV screen, turn off the TV for 15-30 minutes to allow its demagnetizing function to work. If the issue persists, move the speakers further from the TV. Also, avoid placing magnetic objects near the TV, as this can cause irregular coloring due to interaction with the speakers.

Placement of speaker systems

Diagram: Shows an example setup for enjoying a Dolby Pro Logic Surround system and SFC function. The optimal listening position is slightly behind the center of a five-speaker setup, but can be adjusted for personal preference. The diagram depicts Front speakers (Left and Right), a Center speaker, the TV, and Surround speakers (Left and Right).

Speaker Placement Advice:

• Speaker placement significantly affects sound reproduction due to room acoustics.
• Placing speakers on the floor or close to walls can increase bass due to reflection. Adjusting speaker distance from walls can fine-tune bass levels.
• Avoid placing speakers facing hard walls or windows to prevent undesirable resonance or sound reflection. Curtains can help mitigate this.
• Keep speakers from turntables to prevent acoustic feedback (howling) caused by vibrations.
• Keep speakers away from sources of heat, high humidity, and direct sunlight.

CONCERNING THE REMOTE CONTROL

Method for use

Diagram: Depicts the remote control's transmission window and the main unit's signal sensor. It indicates that the signal is best received within a 30-degree angle to the left and right of the sensor, and at a distance of approximately 7 meters (actual range may vary). Obstacles should be avoided.

Notes:

• Ensure the transmission window and signal sensor are free from dust for optimal performance.
• Direct sunlight or strong light sources striking the signal sensor can affect operation. If problems occur, reposition the unit away from such light sources.

FRONT PANEL CONTROLS

Diagram: A detailed illustration of the SL-MC409's front panel, with numbered controls and indicators.

Control List:

• 1. Power "STANDBY/ON" switch: Switches the unit between standby and on modes. The unit consumes a small amount of power in standby mode.
• 2. Single disc play button (SINGLE): Initiates playback of a single disc.
• 3. Direct programming button (DIRECT): For direct track programming.
• 4. Programming button (PROGRAM): Used for setting up programmed playback sequences.
• 5. Windows: Indicates various operational states or information.
• 6. Display: Shows track numbers, time, and other relevant information.
• 7. Disc skip buttons (DISC SKIP -/+): Allows selection of different discs.
• 8. Search buttons (⏪, ⏩): Used for searching within tracks.
• 9. Track skip buttons (⏪, ⏩): Used for skipping to the previous or next track.
• 10. Remote control signal sensor (SENSOR): Receives signals from the remote control.
• 11. Disc group buttons (DISC GROUPING PLAY, A,B,C,D,E): For selecting and playing groups of discs.
• 12. Group enter button (GROUP ENTER): Confirms disc group selections.
• 13. Stop button (■): Stops playback.
• 14. Pause button (⏸): Pauses playback.
• 15. Play button (▶): Starts or resumes playback.
• 16. Disc slot for single disc play (SINGLE): A dedicated slot for playing one disc at a time.
• 17. Loader carriage: Mechanism for loading discs.
• 18. Disc slots: Multiple slots for holding discs.
• 19. Slot numbers: Indicators for the disc slots.

Note: For instructions on opening the front panel to set discs, refer to page 24 ("How to set discs").

EQUIPMENT CONNECTIONS

Connecting system components

Diagram: Illustrates the wiring required to connect various system components. This includes the Tuner, Amplifier, Graphic equalizer, Cassette deck, and CD changer.

Connection Steps:

1. Connect the stereo connection cables (4 pcs.) between components. Stereo connection cables typically consist of White (L) and Red (R) connectors.
2. For SC-S375, S4750 models only: Connect the stereo connection cables (2 pcs.).
3. Connect the AC power supply cords (short thin type) for two components.
4. For SC-S375, S4750 models only: Connect the AC power supply cord (short thin type).
5. Connect the AC power supply cords (long thick type) for two components.

AC outlets of each unit:

• These outlets are intended for audio equipment only. Do not connect video equipment (e.g., TVs) to these outlets.
• Ensure that the total power drawn does not exceed the indicated power ratings when connecting multiple devices.

Concerning the cooling fan:

The cooling fan operates only when the unit is running at high output power levels.

"EQ/EXT" terminals of the amplifier:

Diagram: Shows the EQ/EXT terminals on the amplifier, labeled "OUT" and "IN". It also shows "Shorting pins".

When these terminals are not in use, ensure the included "shorting" pins are inserted.

Connecting external units

For detailed connection instructions for specific external units, refer to their respective instruction manuals.

A: Connecting a turntable, VCR and TV

Diagram: Shows how to connect a turntable (with a ground terminal), a VCR, and a TV to the Amplifier. Connections utilize stereo connection cables and video connection cables. The TV connection is shown to the "Rear panel of TV" with options for VIDEO, L, R, and S-VIDEO inputs.

Diagram: Illustrates connecting a second VCR (for playback only) or a laser disc player to the Amplifier. This involves AUDIO OUT/IN and VIDEO OUT/IN connections.

B: Connecting a second cassette deck (SC-S375, S4750 only)

Diagram: Shows the connection of a second cassette deck to the Amplifier and Graphic equalizer. Connections are made using LINE IN/OUT and TAPE REC/PLAY terminals with audio cables.

CHANGES

CHANGE IN REPLACEMENT PARTS LIST

Note: This parts list details only components that differ from the Model No. SL-MC400 (P). All other parts are identical to the SL-MC400 (P).

Important safety notice:

• Components marked with an [important-safety-symbol] have special characteristics critical for safety.
• Special parts, such as fire-retardant resistors and low-noise components, are used for enhanced performance and safety.
• When replacing components, always use only the manufacturer's specified parts listed in the parts list.
• The [standard-parts-symbol] mark denotes standard parts.

Changes in Part Numbers and Descriptions

Notes: Parts marked with '*' are included in the accessory box for SH-WA37 (P, PC) and SH-WA47 (P). Refer to page 5 of the Technical Information for models SH-WA07/SH-WA17/SH-WA27/SH-WA37/SH-WA47 (Order No. AD9601007T1).