Yamaha HTR-6150 Service Manual page 25

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.
If the power is turned on with the abnormality unsolved, the protection function works in 1 second to turn off the
power.
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.
If the power is turned on with the abnormality unsolved, the protection function works in 1 second to turn off the
power.
When there is a history of protection function due to excessive heat sink temperature
Cause: The temperature of the heat sink is excessive.
Supplementary information:
The protection function worked due to the temperature limit being exceeded.
Causes could be poor ventilation or a defect related to the thermal sensor.
If the power is turned on with the abnormality unsolved, the protection function works in 1 second to turn off the power.
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 memory with a backup.
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.
The history of the protection function is cleared when self-diagnostic function is cancelled by selecting PRESET
RESERVED (Memory initialized) of main menu No. R or when the backup data is erased.
PRV1 PRT:xxx
AD value when the protection function is working
PRV2 PRT:xxx
AD value when the protection function is working
THM PRT:xxx
AD value when the protection function is working
RX-V563/HTR-6150/DSP-AX563
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