Question about Harman Kardon AVR 230 6.1 Channels Receiver

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Harman kardon avr500

I have a receiver, that I bought used. When the volume is turned up close to half way, the receiver shuts down. I checked my speaker connections, and am using good quaity Monster cable. Is there a problem I can fix

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Re: harman kardon avr500

Your drawing to many watts from the unit and its shutting down. Make sure the -/+ are set properly for the speakers. Also the power amp inside the unit could be bad and the relay trips off. Plug straight into the wall and don't go through a powerstrip. Is anything else connected to the receiver?

Posted on Jun 25, 2007

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Just purchased a used hk 3370,only hear a little bit of sound if I turn the volume all the way up.Tried both speaker sets and headphone jack,all the same

Turn the volume down. Maximum volume is not a troubleshooting tool. If it's silent at half volume, it's essentially source-free. No sense blowing your speakers up when we find the setting that's wrong.

Let's us FM for the initial silence issue. Tune a station.

Look carefully at the front panel. Analyze every indicator.

Is MUTED turned on?
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Page 6: items 14 and 15 should be joined by jumpers.

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The amp shuts off all the time. Had to reset it, after half an hour it shuts off again. Is there any solution for that? Thanks

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My device is AVR 645, but AVR 745 has the same power regulator board and you could check, if the problem is there.
(AVR 645 volume blue light was not pulsating)
When device is turned on, it shows all display indicators,
no blue light on volume button and no response to any remote or front panel buttons.
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No 3.3V and 5VD voltages.
I checked bridge rectifier D701 on power regulator board.
One of the diodes was shorted. Also fuse F702 was blown.
Original D701 is KBU6G, but because regulator board is a bit difficult to get out, I decided to use KBU8G. The only difference is Amps rating 6A versus 8A.
Be sure to use SR-5-3.15A fuse to replace F702 and use heat sink paste (you know where) when board is reinstalled.
There is large heatsink in the middle of the receiver. Power regulator board is mounted on the right side of that heatsink. It is down there near the front panel and to get it out you most probably first have
to remove two PCBs hindering access to some regulator component screws. Here are pictures to clarify situation:

harman-kardon-avr-745-looks-frozen-igzigj2finjgh1nndvq1cugs-5-0.png harman-kardon-avr-745-looks-frozen-igzigj2finjgh1nndvq1cugs-5-1.png

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