Yamaha RX-V2065 - AV Network Receiver, Service Manual

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RX-V2065/HTR-6295
RX-V2065/HTR-6295
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Display provided when Self-Diagnostic Function started
The display is as described below depending on the situation when 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 “1. ANALOG BYPAS” of main menu
1 BYPASS) a few seconds later.
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 “1.
ANALOG BYPAS” of main menu 1 BYPASS) 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 ON/OFF” 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 backup memory. For details, refer to main menu 21
PROTECTION HISTORY.
2-1. When the protection function worked due to excess current.
N O P R O T E C T 1 . A N A L O G B Y P A S
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.
After a few seconds
Main menu display Opening message
P S P R T : x x x
Note)
• Applying the power to this unit without correcting the abnormality can be dangerous and cause additional
circuit damage. To avoid this, if protection function has been activated 3 times continuously, the power will not
turn on even when the “MAIN ZONE ON/OFF” key is pressed. In order to turn on the power again, disconnect
the power cable of this unit from the AC outlet once and then reconnect it again.
• The output transistors in each amplifier channel should be checked for damage before applying power of this
unit.
• Amplifier current should be monitored by measuring DC voltage across the emitter resistors for each channel.
AD value when the protection function is working