Yamaha AX 497 Owner's Manual - Page 20
Additional Information, General - power amplifier
UPC - 027108923697
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TROUBLESHOOTING TROUBLESHOOTING Refer to the chart below if this unit does not function properly. If the problem you are experiencing is not listed below or if the instructions below do not help, set this unit to the standby mode, disconnect the power cord, and contact the nearest authorized YAMAHA dealer or service center. ■ General Problem Cause Remedy Refer to page This unit fails to turn The power supply cord is not connected or Connect the power supply cord firmly. on. the plug is not completely inserted. - The impedance setting is incorrect. Set the impedance to match your speakers. 7 The protection circuitry has been activated Check that the speaker wires are not touching each because of a short circuit, etc. other and then turn the power of this unit back on. 8 The IMPEDANCE SELECTOR switch on Set the IMPEDANCE SELECTOR switch to either the rear panel is not set to either end. end when the power of this unit is turned off. 7 This unit has been exposed to a strong Set this unit to the standby mode, disconnect the external electric shock (such as lightning power supply cord, plug it back in after 30 seconds, - or strong static electricity). then use it normally. No sound Incorrect input or output cable connections. Connect the cables properly. If the problem persists, the cables may be defective. 8 No appropriate input source has been Select an appropriate input source with the INPUT selected. selector on the front panel (or one of the input 11 selector buttons on the remote control). The TAPE MONITOR function is turned Turn off the TAPE MONITOR function. on. 4 The SPEAKERS A/B switches are not set Set the corresponding SPEAKERS A or B switch to properly. the ON position. 11 Speaker connections are not secure. Secure the connections. 8 The sound suddenly goes off. The protection circuitry has been activated Check that the IMPEDANCE SELECTOR setting is because of a short circuit, etc. correct. 7 Check that the speaker wires are not touching each other and then turn the power of this unit back on. 8 Only the speaker on one side can be heard. Incorrect cable connections. Incorrect setting for the BALANCE control. Connect the cables properly. If the problem persists, the cables may be defective. 8 Set the BALANCE control to the appropriate position. 13 There is a lack of bass The + and - wires are connected in and no ambience. reverse at the amplifier or the speakers. Connect the speaker wires to the correct + and - phase. 8 A "humming" sound Incorrect cable connections. can be heard. Connect the audio plugs firmly. If the problem persists, the cables may be defective. 8 No connection from the turntable to the GND terminal. Make the GND connection between the turntable and this unit. 8 The volume level is The record is being played on a turntable The turntable should be connected to this unit through low while playing a with an MC cartridge. the MC head amplifier. - record. The volume level The component connected to the TAPE Turn on the power of the component. cannot be increased, OUT or the MD OUT terminals of this or the sound is unit is turned off. - distorted. 16