Yamaha HTR 5550 MCXSP10 Manual - Page 58

TROUBLESHOOTING Problem Cause Remedy A "humming" sound can be heard. Incorrect cable connections. The volume level cannot be increased, or the sound is distorted. The component connected to the OUT (REC) jacks of this unit is turned off. Firmly connect the audio plugs. If the problem persists, the cables may be defective. Turn on the power to the component. The sound effect cannot be recorded. A source cannot be recorded by a digital recording component connected to the DIGITAL OUTPUT jack of this unit. It is not possible to record the sound effect by a recording component. A source component is not connected to the DIGITAL INPUT jacks of this unit. Connect the source component to the DIGITAL INPUT jacks of this unit. The sound field parameters and some other settings on this unit cannot be changed. "10 MEM. GUARD" in the SET MENU is set to ON. Set "10 MEM. GUARD" in the SET MENU to OFF. This unit does not operate properly. "CHECK SP WIRES" appears on the front panel display. The internal microcomputer has been frozen by an external electric shock (such as lightning or excessive static electricity) or by a power supply with low voltage. Disconnect the AC power cord from the outlet and then plug it in again after about 30 seconds. Speaker cables are short circuited. Make sure all speaker cables are connected correctly. There is noise interference from digital or high-frequency equipment, or this unit. This unit is too close to the digital or high-frequency equipment. Move this unit further away from such equipment. This unit suddenly turns into the standby mode. The internal temperature becomes too high and the overheat protection circuitry has been activated. Wait until this unit cools down and then turn it back on. Refer to page 10 - 16 - - - - - - - - 54