Yamaha CHR Series Manual - Page 11
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Troubleshooting
Symptom
No sound.
Howling sound is produced
(feedback).
The amplifier shuts down.
High frequency range is attenuated.
If any specific problem should persist, however, please contact your Yamaha dealer.
Possible causes
The cable is not connected properly.
A microphone is directed toward the
speaker.
The sound is amplified too much.
The total impedance of the speakers is less
than the minimum load impedance of the
amplifier.
Example:
More than two speakers (eight ohms) are
connected to a power amplifier, the load
impedance of which is six ohms.
The protection circuit is operating in the HF
unit.
Possible solution
• Connect the cable all the way in so that it
is firmly in place.
• Connect to "1+" and "1–" and turn the
plug to be locked.
Aim the speaker away from the area where
the microphone picks up sound.
Lower the volume of input device and locate
the microphone more closely to the sound
source.
Check the minimum load impedance of the
power amplifier, and lower the number of
speakers connected in parallel not to be
less than the impedance.
Refer to "Protective Circuit" in the NOTICE
(page 3).
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