Yamaha YMC-700 Service Manual page 28

YMC-700/YMC-500
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When there is a history of protection function due to abnormal voltage in the power supply section
Cause: The voltage in the power supply section is abnormal.
Supplementary information: The protection function worked due to a defect or overload in the power supply.
Turning on the power without correcting the abnormality will cause the protection function to work in 1 second and the
power supply will be shut off.
When there is a history of protection function due to excessive D-AMP temperature
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L 13942296513
Cause: The temperature of the D-AMP is excessive.
Supplementary information: The protection function worked due to the temperature exceeding limit. Causes could
be poor ventilation or a defect related to the thermal sensor.
Turning on the power without correcting the abnormality will cause the protection function to work in 1 second and the
power supply will be shut off.
For detection of each protection function, refer to main menu described later.
● History of protection function
When the protection function has worked, its history is stored in backup memory.
Even if no abnormality is noted while servicing the unit, an abnormality which has occurred previously can be
defined as long as the backup data has been stored.
For details of the history of protection function, refer to main menu P: PROTECTION HISTORY.
The history of the protection function is cleared when self-diagnostic function is cancelled by selecting main
menu N: PRESET RESERVED (Memory initialized) or when the backup data is erased.
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PRV xxx
AD value is displayed, when the protection function is working
THM xxx
AD value is displayed, when the protection function is working
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