Yamaha R-V905 Owner's Manual - Page 52

TROUBLESHOOTING If the unit fails to operate normally, check the following points to determine whether the fault can be corrected by the simple measures suggested. If it cannot be corrected, or if the fault is not listed in the SYMPTOM column, disconnect the power cord and contact your authorized YAMAHA dealer or service center for help. SYMPTOM The unit fails to turn on when STANDBY/ON is pressed, or turns into the standby mode suddenly soon after the power is turned on. The unit does not work normally. No sound or no picture. The sound suddenly goes off. Only one side speaker outputs sound. A "humming" sound can be heard. The volume level is low while playing a record. The volume level cannot be increased, or the sound is distorted. No sound from the rear speakers. No sound from the center speaker. CAUSE Power cord is not plugged in or is not completely inserted. The IMPEDANCE SELECTOR switch on the rear panel is not fully set to the upper or lower end. There is an influence of strong external noise (lightning, excessive static electricity, etc.) or a misoperation while using this unit. Incorrect output cord connections. Appropriate input source is not selected. SPEAKERS are not set properly. Speaker connections are not secure. The protection circuit has been activated because of short circuit etc. The SLEEP timer has functioned. Incorrect setting of BALANCE. Incorrect cord connections. Incorrect cord connections. No connection from the turntable to the GND terminal. The record is being played on a turntable with an MC cartridge. The component connected to the REC OUT terminals of this unit is in the standby mode. The sound output level of the rear speakers is set to minimum. A monaural sound source is being played in DOLBY PRO LOGIC or DOLBY PRO LOGIC ENHANCED mode. The sound output level of the center speaker is set to minimum. The center channel mode is in NONE mode. Incorrect sound field program selection. REMEDY Firmly plug in the power cord. Set the switch fully to the upper or lower end. Turn this unit into the standby mode and disconnect the AC power cord from the AC outlet. After about 30 seconds have passed, connect the power and operate this unit again. Connect the cords properly. If the problem persists, the cords may be defective. Select an appropriate input source with INPUT. Set SPEAKERS corresponding to the speakers in use to the ON position. Secure the connections. Turning the unit into the standby mode and then on again will reset the protection circuit. Cancel the SLEEP timer function. Adjust it to the appropriate position. Connect the cords properly. If the problem persists, the cords may be defective. Firmly connect the audio plugs. If the problem persists, the cords may be defective. Make the GND connection between the turntable and this unit. The turntable should be connected to the unit through the MC head amplifier. Turn the power to the component on. Raise the sound output level of the rear speakers. Select another sound field program suitable for the monaural sound source. Raise the sound output level of the center speaker. Select LARGE or SMALL. Select the appropriate program. Amplifier 52