Announcement

Collapse
No announcement yet.

Harman Kardon AVR-355 going into standby

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Harman Kardon AVR-355 going into standby

    My AVR-355 switches itself to standby mode after a few minutes, when it becomes warm. If I turn it back on, it doesn't shut off anymore and can run for hours. If I let it cool down for a few hours and then turn it on again, it shuts off again after a few minutes. But no more problems if I turn it back on immediately. This always happens, even if the device is not connected to anything. I don't see a "protect" message or anything special. The device simply goes to standby (amber power button)
    I did a complete reset of the CPU, but the problem persists...
    I have attached the service manual, but I'm not sure which way to look. Is it a power supply problem, or is it the CPU forcing standby mode because it has detected an abnormal condition?
    Pierre-Yves Andri, Belgium.
    Attached Files

    #2
    Re: Harman Kardon AVR-355 going into standby

    sounds like a bad cap,
    try using a hair dryer to narrow down which part of the board needs to be warm.

    Comment


      #3
      Re: Harman Kardon AVR-355 going into standby

      there are two fuses on the transformer circuit board f110 and f111, harmon kardon recommends replacing them with 3.15a 250v fuses, should solve the problem

      Comment


        #4
        Re: Harman Kardon AVR-355 going into standby

        Hi Daron,

        After buying a new AVR (Denon), I decided to repair this old and good HK AVR-355. So I located F110 & F111, but they are already 3.15A fuses.
        To be sure, I decided to momentarily bridge them, but the problem is still there : switching to standby mode after 5..10 minutes
        (but AVR remains ON if I restart it immediately, until next cold start).

        Thanks for your suggestion anyway !

        Comment


          #5
          Re: Harman Kardon AVR-355 going into standby

          1. Measure AC component on every DC voltage rails. Replace / check capacitors when to high.
          2. Check IC36, IC37 voltage regulators. I have seen the negative gone bad a few times. Input selector gets hot when bad

          Comment

          Working...
          X