ลองเช็คว่าสายลำโพงไม่มีการ short ของ + และ - เพราะเหมือนเข้า protection mode
ให้ถอดปลั๊กออก ทิ้งไว้สักพัก แล้วเสียบใหม่ให้ไฟ standby ขึ้น รออีก 2-3 ชมแล้วค่อยมาเปิดใหม่ เคยทำกับ AVR Denon ที่มีอาการคล้ายๆกันครับ ถ้าไม่หายลอง processor reset
Processor Reset
In the rare case where the units operation or the
displays seem abnormal, the cause may involve
the erratic operation of the systems memory or
microprocessor.
To correct this problem, first unplug the unit from
the AC wall outlet and wait at least three minutes. After the pause, reconnect the AC power
cord and check the units operation. If the system
still malfunctions, a system reset may clear the
problem.
To clear the AVR 5500s entire system memory
including tuner presets, output level settings,
delay times and speaker configuration data,
Firstput the unit in Standby by pressing the System Power Control button
Next, press the Tone Mode and the RDS buttons simultaneously.
The unit will turn on automatically and display the R E S E T message in the Main Information Display
Note that once you have cleared the memory in this manner, it is necessary to re-establish all system configuration
settings and tuner presets.
NOTE: Resetting the processor will erase any
configuration settings you have made for speakers, output levels, surround modes, digital input
assignments as well as the tuner presets. After a
reset the unit will be returned to the factory presets, and all settings for these items must be
reentered.
If the system is still operating incorrectly, there
may have been an electronic discharge or severe
AC line interference that has corrupted the memory or microprocessor.
If these steps do not solve the problem, consult
an authorized Harman Kardon service depot.
ถ้ายังไม่ได้อีกคงต้องส่งศูนย์ครับ
