Yamaha R-N402, Service Manual

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R-N402/R-N402D
R-N402/R-N402D
2-2. When the protection function worked due to abnormal DC output.
DC PRT:xxxH
Cause: D C output of the power amplifier is abnormal.
Supplementary information: T he protection function worked due to a D C voltage appearing at the speaker
terminal. A cause could be a defect in the amplifier.
T urning on the power without correcting the abnormality will cause the protection function to work in 5 seconds
and the power supply will be shut off.
2-3. When the protection function worked due to abnormal voltage in the power supply section.
PSxPRT:xxxL
Cause: T he voltage in the power supply section is abnormal.
Supplementary information: T he protection function worked due to a defect or overload in the power supply.
T urning on the power without correcting the abnormality will cause the protection function to work in 1 seconds
and the power supply will be shut off.
Notes:
• Applying the power to this unit without correcting the abnormality can be dangerous and cause
additional circuit damage. To avoid this, if “ PS ” and “ DC ” protection function works 3 times
consecutively, the power will not turn on even when the “
z
” (Power) key is pressed. In order to turn on
the power again, start up the self-diagnostic function.
• The output transistors in each amplifier channel should be checked for damage before applying power
to this unit.
• Amplifier current should be monitored by measuring DC voltage across the emitter resistors for each
channel.
H: Displayed when the voltage is HIGHER than upper limit
L: Displayed when the voltage is LOWER than lower limit
H: Displayed when the voltage is HIGHER than upper limit
L: Displayed when the voltage is LOWER than lower limit
xxx: A/D conversion value of voltage at the moment when the protection function worked
(Reference voltage: 3.3 V=255)
xxx: A/D conversion value of voltage at the moment when the protection function worked
(Reference voltage: 3.3 V = 255)
PS1/PS2/PS3