Display Provided When Self-Diagnostic Function Started; When The Power Is Turned Off By Usual Operation; When The Protection Function Worked To Turn Off The Power - Yamaha RX-V667 Service Manual

RX-V667/HTR-6063/RX-A700
● Display provided when Self-Diagnostic Function started
The display is as described below depending on the situation the last time the power to this unit is turned off.

1. When the power is turned off by usual operation:

The FL display of this unit displays "NO PROTECT" then the main menu (sub-menu "A1-1. DSP MARGIN" of main menu
No. A1 DSP AUDIO) a few seconds later.
Opening message

2. When the protection function worked to turn off the power:

The FL display of this unit displays the data of protection function which worked at that time then the main menu (sub-menu
"A1-1. DSP MARGIN" of main menu No. A1 DSP AUDIO) a few seconds later.
Note: At that time if you reactivate the self-diagnostic function after turning off the power once by pressing the "MAIN
ZONE " (power) key, "NO PROTECT" will be displayed because that situation is equal to "1. When the power is
turned off by usual operation:" described above.
However the protection function history is stored in a back-up IC with a backup. For details, refer to main menu P2
PROTECTION HISTORY."
2-1. When there is a history of protection function due to excess current.
Cause: An excessive current flowed through the power amplifier.
Supplementary information: As current of the power amplifier 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.
Notes)
• Applying the power to this unit without correcting the abnormality can be dangerous and cause additional
circuit damage. To avoid this, if "I PROTECT" protection function works 1 time, 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.
26
After a few seconds
Main menu display