Yamaha 150 Manuel du propriétaire - Page 12

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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 c

Indicator

CLIP indicator lights.

PROTECTION

indicator lights.

ase.

Probable Cause

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.

Remedy

Locate and correst the

cause of the short.

Set the speaker impe-

dance to 32 or higher

with the OUTPUT VOLT-

AGE switch set to 70 V,

or to 64 or higher with

the OUTPUT VOLTAGE

switch set to 100 V.

Check the amplifier

ventilation conditions

and take appropriate

measures to improve

airflow around the

amplifier.

Consult your dealer or

nearest Yamaha

service center.

Protection Circuit

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.