Yamaha R-V902 Owner's Manual - Page 43
Troubleshooting - service manual
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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. General SYMPTOM The unit fails to turn on when the POWER switch is pressed, or turns off suddenly soon after the power is turned on. It happens that this unit does not work normally. No sound or no picture. The sound suddenly goes off. Only one side speaker outputs the sound. Sound "hums". The volume level is low while playing a record. The volume level cannot be increased, or sound is distorted. No sound from the rear speakers. No sound from the center speaker. The sound is degraded when listening with the headphones connected to the compact disc player or cassette deck that are connected with this unit. FM stereo reception is noisy. There is distortion and clear reception cannot be obtained even with a good FM antenna. A desired station cannot be tuned in with the automatic tuning method. Previously preset stations can no longer be tuned in. A desired station cannot be tuned in with the automatic tuning method. There are continuous crackling and hissing noises. There are buzzing and whining noises (especially in the evening). The remote control transmitter does not work. CAUSE Power cord is not plugged in or is not completely inserted. The IMPEDANCE SELECTOR switch on the rear panel is not set to the upper or the lower end exactly. There is an influence of strong external noise (lightning, excessive static electricity, etc.) or a misoperation on this unit while using this unit. Incorrect output cord connections. Appropriate input source is not selected. The SPEAKERS switches 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 the BALANCE control. 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 power to the component connected to the REC OUT terminals of this unit is off. The sound output level to the rear speakers is set to minimum. The monaural sound source is played in DOLBY PRO LOGIC or DOLBY PRO LOGIC ENHANCED mode. The sound output level to the center speaker is set to minimum. The center channel mode is in PHANTOM mode. Incorrect sound field program selection. The power to this unit is off. REMEDY Firmly plug in the power cord. Set the switch to the upper or the lower end exactly. Turn off the power to this unit 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 the input selector buttons. Set the SPEAKERS switch which corresponds to the speakers to be used to the ON position. Secure the connections. Turning the unit off and then on 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 player should be connected to the unit through the MC head amplifier. Turn the power to the component on. Raise the sound output level to the rear speakers. Select another program suitable for the monaural sound source. Raise the sound output level to the center speaker. Select NORMAL or WIDE. Select the appropriate program. Turn the power to this unit on. Because of the characteristics of FM stereo broadcasts, this is limited to cases where the transmitter is too far away or the antenna input is poor. There is multipath interference. The station is too weak. This unit has been unplugged for a long period. Check the antenna connections. Try using a high quality directional FM antenna. Set the TUNING MODE button to the manual tuning mode. Adjust antenna placement to eliminate multipath interference. Use the manual tuning method. Use a high quality directional FM antenna. Repeat the presetting procedure. Weak signal or loose antenna connections. Noises will result from ligtning, fluorescent lamps, motors, thermostats and other electrical equipment. A television set is being used nearby. Tighten the AM loop antenna connections and rotate it for best reception. Use the manual tuning method. Use an outdoor antenna and a ground wire. This will help somewhat but it is difficult to eliminate all noise. Relocate this unit away from the TV. Direct sunlight or lighting (of an inverter type of flourescent lamp etc.) is striking the remote control sensor of the main unit. The batteries of this remote control transmitter are too weak. Change the position of the main unit. Replace the batteries with new ones. FM AM Remote control transmitter 43
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