My receiver (Kenwood KRF-V8010D, 1999) looses sound setup, stored radio stations etc when it is switched off. It started with it happening only now and then but it has been persistent for at least 6 months or so now. I have the service manual and the microprocessor has an EEPROM connected to it (a Xicor x24c02), but it does not say what information the EEPROM holds. I guess it could hold these settings but in worst case the microprocessor has a bootloader reading a program from the EEPROM - therefore I do not dare replace it straight away. Has anyone else had this problem on a similar unit? Anyone who knows how the uc and memory works on this unit?
Check the wiring at back the wire for memory may have worked loose.
SOURCE: HARMAN KARDON 630
Hi there, RikSound1. The problem is the C657 capacitor, located on the DSP PCB. It's a 0.047 farad capacitor, 5.5V. You can either replace it yourself, or just hand the info out at your local repair centre ! It will fix the problem for sure, i have fixed that problem already. Thanks, cheebster.
SOURCE: Harman Kardon AVR 7000 loosing memory
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:
Model: AVR7000
Designator: C730
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.
SOURCE: my kenwood krf-v4060d reciever on/off switch is faulty.
The problem is not likely to be the switch itself. The unit is rpobably going into "protect" mode because of a problem internally. Try removing all the cables and try to turn on the unit. If the behavior remains the same, the output section requires repair. The most common failure is the output transistors. Expect a parts cost in the $40-$60 range.
Dan
SOURCE: The receiver goes into standby mode every 3-5
Congratulations Wilhelm, not for finding out the possible cause of your equipment problem, but by acknowledging that your observation is not sufficient to qualify you to just plow in and undertake the repairs.
You MAY have found the exact fault, but then again you may only have found PART of the cause of failure. Note that ALL COMPONENTS in your equipment may be of different original date of manufacture. Just because they are in YOUR equipment does not mean they are all the same age. One thing is possible is that other capacitors have aged detrimentally also, but not to the point where they show it physically. A good Technician can do a check way beyond that of a visual check such as you have done. Not only that.....they will check in ways to give you to be more confident that just replacing those obvious parts will not obviate short term failure yet again.
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My first post here, not sure how it ended up in the HK forum or how to move it. Bare with me....
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