Yamaha RX-Z1 Service Manual page 19

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 abnormal voltage is
displayed in % based on 5V as 100%.
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.
When there is a history of protection
function due to abnormal DC output
Cause: DC output of the power amplifier is abnormal.
Supplementary information: The abnormal voltage is
displayed in % based on 5V as 100%.
Turning on the power without correcting the abnormality
will cause the protection function to work 3 seconds later
and the power supply will be shut off.
When there is a history of protection
function due to excessive heat sink
temperature
Checksums of main microprocessor / sub microprocessor
Cause: The temperature of the heat sink is excessive.
Supplementary information: The abnormal voltage is
displayed in % based on 5V as 100%.
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.
Voltage display in %
PS PRT:000 X/X
SUM:XXXX/XXXX
Checksums of main microprocessor / sub microprocessor
Voltage display in %
DC PRT:000 X/X
SUM:XXXX/XXXX
Checksums of main microprocessor / sub microprocessor
Voltage display in %
TMP PRT:000 X/X
SUM:XXXX/XXXX
Versions of main microprocessor / sub microprocessor
Versions of main microprocessor / sub microprocessor
Versions of main microprocessor / sub microprocessor
RX-Z1/DSP-AZ1
18