Service manual

RX-V665/HTR-6260

● Display provided when Self-Diagnostic Function started

The FL display of this unit displays the protection function history data then the main menu (sub-menu “1. ANALOG

BYPAS” of main menu No. 1 BYPASS) a few seconds later.

When there is no history of protection function:

NO PROTECT

PRI PRT:xxx

1.ANALOG BYPAS

When there is a history of protection function:

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 displayOpening message

Note)

• Applying the power to this unit without correcting the abnormality can be dangerous and cause additional cir-

cuit 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.

When there is a history of protection function due to excess current

AD value when the protection function is working