Yamaha DSP-A1 Owner's Manual - Page 75
Troubleshooting - problems
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English 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 STANDBY/ON switch is pressed, or turns into the standby mode suddenly soon after the power is turned on. It happens that this unit does not work normally. No sound or no picture. No picture The sound suddenly goes off. Only one side speaker outputs the sound. No sound from the effect speakers. No sound from the front effect speakers. No sound from the center speaker. Poor bass reproduction. Sound "hums". The volume level is low while playing a record. The volume level cannot be increased, or sound is distorted. CAUSE Power cord is not plugged in or is not completely inserted. The IMPEDANCE SELECTOR switch on the rear panel is not set to either end closely. 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. Speaker connections are not secure. Digital signals other than PCM audio and the Dolby Digital (AC-3) (or the DTS) encoded signals which this unit cannot reproduce are input to this unit by playing a CD-ROM etc. There is no S video terminal connection between this unit and the TV, though S video signals are input to this unit. 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. The EFFECT button is set off. A Dolby Surround (or DTS) decoding program is being used with material not encoded with Dolby Surround (or DTS). The function "1E. FRONT MIX" in the SET MENU mode is set to the "ON-5ch" position. PRO LOGIC/Normal, DOLBY DIGITAL/ Normal or DTS DIGITAL SUR./Normal of the DSP program No. 12 is selected. The function "1A. CENTER SP" in the SET MENU mode is set to the "NONE" position. One of the DSP programs No. 1 to No. 6 is selected when the input signal of source is 2-channel stereo (analog/PCM). The input signals of source encoded with the Dolby Digital (AC-3) or the DTS do not have center channel signals. The function "1D. LFE/BASS OUT" in the SET MENU mode is set in the SWFR or BOTH position, though your system does not include a subwoofer. Output mode selection for each channel (MAIN, CENTER or REAR) is improper. 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 MD/TAPE 1 REC terminals of this unit is turned off. REMEDY Firmly plug in the power cord. Set the switch to either end closely. 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 the appropriate input source with the INPUT SELECTOR or the TAPE 2 MON/EXT. DECODER button. Secure the connections. Play a source whose signals this unit can reproduce. Connect this unit's S VIDEO MONITOR OUT terminal to the TV's S video input terminal. Turn this unit into the standby mode, and then turn on to 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. Press the EFFECT button to turn it on. Use a different sound field program. Set to the "OFF-7ch" position. Select another program (or subprogram). Select the appropriate position. Select another program. Refer to the instructions for the source currently played. Select the MAIN position. Make output mode selections suitable for your speaker system. 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 on the power to the component. 73