Yamaha XS250 User Manual download pdf (Page 14)

Troubleshooting

The following table lists the main causes of abnormal operation and the corrective measures required, as well as the

protective circuit operation in each case.

Protection CircuitRemedyProbable CauseIndicator

CLIP indicator lights.

PROTECTION

indicator lights.

There is a short at a

speaker terminal,

amplifier terminal, or

wire.

The amplifier load is

excessive.

The heat sink

temperature has

exceeded 90°C.

A DC voltage of ±2 V

or greater was

generated in the power

amplifier’s output

circuit.

Locate and correst the

cause of the short.

Use a speaker system

with an impedance of

at least 4Ω (stereo) or

8Ω (bridge).

Check the amplifier

ventilation conditions

and take appropriate

measures to improve

airflow around the

amplifier.

Consult your dealer or

nearest Yamaha

service center.

The PC limiter circuit

operates to protect the

power transistors.

The thermal protection

circuit operates to

protect the power

transistors.

The relay operates to

protect the speaker

system.

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Yamaha XS250 User Manual Page 14

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