Question about Harman Kardon AVR 745 Receiver
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Posted on Jan 02, 2017
Is this only when using external inputs? The manual says the Tone Control will not function in Direct Mode. Try Stereo and various DSP surround modes to see if the Tone Control works.
Posted on Apr 21, 2009
You have a memory cap ,usally located on the front display,that is most likely defective.measure voltage on cap with unit off should measure at least 3-5 volts
Posted on Apr 14, 2010
The problem is in the audio driver and output stage of the receiver, check the speaker wires for shorts, if okay! the semiconductors are the issue and I recommend a professional for this type of repair.
Posted on Apr 03, 2012
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.
Reason for failure:
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:
Posted on Dec 09, 2014
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