Yamaha HTR-6063, Service Manual

Page: 27 / 144

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 “MAIN ZONE ” (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 3 seconds and the
power supply will be shut off.
2-2. When the protection function worked due to abnormal DC output.
AD conversion value when the protection function is working
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.
AD conversion value when the protection function is working
2-3. When the protection function worked due to abnormal voltage in the power supply section.
D C P R T : x x x H
P S x P R T : x x x L
27
RX-V667/HTR-6063/RX-A700
RX-V667/HTR-6063/
RX-A70
0