History Of Protection Function - Yamaha RX-V3900 Service Manual

RX-V3900/DSP-AX3900
Cause: DC output of the power amplifier is abnormal.
(Normal value: 5 to 34)
Supplementary information: The abnormal voltage is
displayed in based on 5V as 255.
Turning on the power without correcting the abnormality
will cause the protection function to work 4 seconds later
and the power supply will be shut off.
Cause: The temperature of the heat sink is excessive.
(Normal value: TMP1/TMP2 10 to 83)
Supplementary information: The abnormal voltage is
displayed in based on 5V as 255.
Turning on the power without correcting the abnormality
will cause the protection function to work 1 second later
and the power supply will be shut off.
* Additional causes of protection can be due to loose
connections, associated components, Microprocessor,
etc.
* For the protection voltage value, refer to main menu No.
P1 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. S3 or when the backup data is erased.
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When there is a history of protection function due to abnormal DC output
A/D conversion value of voltage
When there is a history of protection function due to excessive
heat sink temperature
A/D conversion value of voltage
Firmware version
Firmware version