Tip & How-To about Denon Reciever Dra-345r
My 24 OLD Denon Receiver showed Radio Frequency settings Memory Loss, Power UP reset issues, loss of selected inputs. After reviewing the schematic I found a gold cap (big yellow ELKO) that is responsible of keeping uC Vdd under steady Voltage to keep all settings. According original spec it should keep all data 1 month minimum. I do not know if the issue is that the leakage current has increased somewhere, or that the capacitor lost its capacity. It concerns C643 8.2mF capacitor, near IC605 and D605. I replaced the capacitor with a PANASONIC EECS5R5V155 1.5F capacitor. WIth this capacitor it does not matter if the problem is caused by leakage current, as the 1.5F is >100x more capacity. The first time when the cap needs to be charged, the unit responded little strange, but since 2nd power up this problem is fully solved. The PANASONIC device fits excellent on the C643 position, no bending of wires needed.
BTW, compliments to DENON, the original components are soldered with low amount of solder, easy to remove with manual vacuum solder remover(don't know the UK word for it), so no baking, simply remove solder, take out component, place new one.
Unit is now working again as new.
Regards and success with the repair
PS: I found the component at tme.eu
Posted by pe1fjn on
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