Yamaha RX-V100D Service Manual page 15

• Display provided when DIAG started
The FL display of the main unit displays the protection function history data and the version (1 alphabet) and the DIAG menu
[sub-menu (ANALOG BYPASS) of DIAG menu No.1 BYPASS] a few seconds later.
When there is no history of protection function:
When there is no history
of protection function
When there is a history of protection function:
Cause: An excessive current flowed through the power amplifier.
Supplementary information: As current of the power transistor is detected, the abnormal channel can be identified by
checking the current detect transistor.
Turning on the power without correcting the abnormality will cause the protection function to work immediately and the
power supply will instantly be shut off.
Note)
• Applying the power to a unit without correcting the abnormality can be dangerous and cause additional circuit damage.
• The output transistors in each amplifier channel should be checked for damage before applying any power.
• Amplifier current should be monitored by measuring across the emitter resistors for each channel.
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.
Opening message
Version (1 alphabet)
After a few seconds
When there is a history of protection
function due to excess current
When there is a history of protection
function due to an abnormal voltage in
the power supply section
Voltage display in %
DIAG menu display
Version (1 alphabet)
Version (1 alphabet)
RX-V100D
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