Brand: YAMAHA
Category: Audio/Video
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for MCR-640
Uploaded: Nov. 21, 2025, 6:56 p.m.
Warranty Information
No warranty information is available in the provided pages.
Basic system operations
1. Press (On/Standby) to turn on the receiver. The front panel display lights up.
2. Select the desired input source using the input selection keys on the remote control or the INPUT button on the front panel.
3. Start playback on the selected source component or select a radio station.
4. Adjust the volume using the VOLUME +/- buttons on the remote control or the VOLUME knob on the front panel.
5. Adjust sound settings like BASS, TREBLE, and BALANCE using the corresponding knobs on the front panel.
Pure Direct mode
Press PURE DIRECT to turn on Pure Direct mode. This bypasses tone controls and turns off the front panel display for pure high-fidelity sound.
Muting the sound (MUTE)
Press MUTE to reduce the volume by approximately 20dB. Press again to restore the volume.
Changing the brightness of the front panel display
Press DIMMER to cycle through brightness levels: normal, mid dim, and dim.
Using headphones
Connect headphones to the PHONES jack on the front panel. Sound from speakers and subwoofer will stop.
Troubleshooting and error codes
| Troubleshooting | Cause | Solution | See page |
|---|---|---|---|
| Receiver does not turn on or goes into standby mode after power is supplied. | Power cable is not connected or plug is not fully inserted into the outlet. | Connect the power cable properly. | 8 |
| Receiver was subjected to strong electrical surges (e.g., lightning or static electricity). | Set the receiver to standby mode, disconnect the power cable, plug it back in after 30 seconds, then use as normal. | 8 | |
| A cable short-circuited, activating the protection system. | Ensure cable connections of all speakers to the receiver are secure, and that wires do not touch unintended parts. | 8 | |
| Internal temperature is too high, activating the protection system. | Wait for approximately 1 hour for the receiver to cool down, then turn it on again. | 8 | |
| Input/output cables are connected incorrectly. | Connect cables properly. If the problem persists, the cables may be faulty. | 8 | |
| The appropriate source was not selected. | Select the appropriate input source using the INPUT selector on the front panel or the input selection buttons on the remote control. | 8 | |
| No sound | Speakers are not connected securely. | Connect speakers securely. | 8 |
| Low volume level. | Increase the volume level. | 8 | |
| Sound disappeared. | Press the MUTE or VOLUME +/- button to resume sound, then adjust the volume. | 7 | |
| Signals from the source component (e.g., CD-ROM) are not reproducible by the receiver. | Play a source whose signals can be reproduced by the receiver. | — | |
| Sudden sound cut-off. | Receiver was turned off by the timer. | Turn on the receiver and start playback again. | — |
| Sound audible from only one speaker. | Cables are not connected properly. | Connect cables properly. If the problem persists, the cables may be faulty. | 8 |
| The receiver is placed too close to digital or radio frequency equipment. | Move the receiver away from such equipment. | — | |
| Sound is distorted. | Excessively high volume level. | Adjust the volume level. | 13 |
| "CHK SP WIRE" appears on the display. | Short circuit in speaker cables. | Check the correct connection of speaker cables. | 8 |