Question about Audio Players & Recorders
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Posted on Jan 02, 2017
This is what's in the AVR7000 service manual:
Subject: Backup Memory on AVR/DPR/HK series receivers.
In the event of the complaint: “the receiver is losing its memory (any programmed system settings)
when the unit is turned off, or after the unit is unplugged (briefly*)”:
Check and replace:
Location: Front PCB
Description: 0.047 Farad 5.5v capacitor
Part number: # P10790-ND or # J3432147324X
I'm having the same problem and this is how far i got so far. I don't kwow how to get and replace this part.
Posted on Nov 16, 2008
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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