Yamaha R-N500, Service Manual

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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 “ ” (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.
Cause: DC output of the power amplifier is abnormal.
Supplementary information: The protection function worked due to a DC voltage appearing at the speaker
terminal. A cause could be a defect in the amplifier.
Turning 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.
2-2. When the protection function worked due to abnormal DC output.
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 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.
xxx: A/D conversion value of voltage at the moment when the protection function worked
(Reference voltage: 3.3 V=255)
H: Displayed when the voltage is HIGHER than upper limit
L: Displayed when the voltage is LOWER than lower limit
D C P R T : x x x H
xxx: A/D conversion value of voltage at the moment when the protection function worked
(Reference voltage: 3.3 V=255)
PS1/PS2/PS3
H: Displayed when the voltage is HIGHER than upper limit
L: Displayed when the voltage is LOWER than lower limit
P S x P R T : x x x L
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R-N500
R-N50
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