Question about Harman Kardon AVR 320 Receiver

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Settings memory capacitor

Anyone know where it is on this model?

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Hello, recently my rxv3800 hasnt been turning on every time and today it has stopped all together

Some Electrolytic capacitors are used as a Battery. A Super Cap.

.47uF is the value rated at 5.5 volts DC

I used to short the leads together on my Amp's Memory Battery & this would cause a memory reset and all would work well for a few months.
Cant tell you where it would be located.

Jan 08, 2016 | Yamaha RX-V3800 Receiver

1 Answer

Memory back up

There is a capacitor in the circuit for the micro. This particular capacitor is for saving the memory settings and it is most likely defective now. You will need to take it to a repair center and have them check it out for you. Replacing this capacitor should not be too expensive, but you never know how some shops are going to charge you.

I do not have the schematics for this model of Marantz or I would just tell you what capacitor it is. This capacitor acts like a battery in the unit. It only requires a very small amount of power to maintain memory settings and these capacitors work very well for that purpose. Many times you can find them on the display board. But, once again, unless you have experience working with these type of units you should not try it yourself. It is very easy to damage electronics if you do not know what you are doing.

Let me know if you need any more help.


Jul 25, 2008 | Marantz SR-19 Receiver

1 Answer

Sheerwood rv4080 r receiver /online manual

I think you might have a failure of a memory retention capacitor. These are small odd looking capacitors that store voltage for memory chips.
Look for something like this:


Feb 26, 2010 | Sherwood RV-4080R

2 Answers

Marantz SR-18EX Loses Memory and Has Distortion on Center Ch.

There is a 1 Farad "super capacitor" that needs to be replaced. You need soldering skills to do it. The board is accessible if you remove the front panel of the receiver. The part # is DB-5R5D105; you can get them on eBay for about $2.00 each. Regarding the center channel issue, you may have a bad solder joint on the P781 connector on the P774 board. This is the board that houses the output transistors for the 3-channel main amp board (P704). If not these solder joints, you have a weak driver transistor on P704, and troubleshooting would probably be best left to a pro. Good luck!

Aug 17, 2009 | Marantz SR-18EX Receiver

1 Answer

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.

Oct 25, 2008 | Harman Kardon AVR 7000

1 Answer

Lose memory

I do not know for your particular model. There are a dozens of these models in each of the manufacture type receivers. Not all of these receivers use a battery for backup.

If your reciever uses a battery for backup:
In most of these recievers the backup battery is located behind the front bezzle on the front control circuit board. On others it would be on the main circuit board. The battery looks like a small silver coin. Depending on the model, it can be a diameter of about 3/8 of an inch up to over 1/2 of an inch. In many cases the battery is a special type that has solder lugs spot welded to it. The battery would be available from the manufacture's parts and service rep for your area. You will need experience in soldering, and have de-soldering and soldering tools to change the battery in most of these receivers. The cost of the battery is usually in the area of about $6 to $10 depending on the type and rating.

If the reciever's memory uses a gold leaf capacitor:
In many models, they are using a gold leaf storage capacitor instead of a battery. The value of the capacitor is usually in the range of about 4.7 F to 5.5 F rated at 5V to 6V depending on the type. This capacitor is usually not a stock item from most generic electronics parts suppliers. The original should be available from the manufacture's service and parts rep. It is possible to order a generic type from most electronic parts suppliers. You must specify the electrical ratings for it, or an equivelent generic part number. You will need experience in soldering, and have de-soldering and soldering tools to change this capacitor. The cost of this capacitor can be in the area of about $8 to $20 depending on the type and rating.

If your receiver uses an EEPROM for its memory:
Many of these receivers use an EEPROM for the user set-up and memory settings. The EEPROM may be intergrated with the main uPC in many of the models. If this is the case and service is required, this will require proper troubleshooting to determine if the fault is actually the EEPROM section or some other support component. The EEPROM section in these receivers is usually not a socket-ed type IC device. It is usually soldered to the circuit board and it would most likely be a high density surface mount type device. In this case specialized SMD type soldering tools and the proper skills will be required to change this component. To perform this level of service, the factory service manuals, experience and training will be required.

The uPC/EEPROM would have to be purchased as an original part from the manufacture. It will contain internal firmware that is dedicated to the model of the receiver. Many times, they may recommend to change the complete circuit board rather than the IC itself.

After changing the uPC in many models of receivers, as like TV sets, there will be the factory level programing that is necessary to make the receiver work to specs. This will require the factory service manuals, training, and the proper calibration and setup instrumentation to do the task.

Jerry G.

Sep 01, 2008 | Pioneer VSX-D810S Receiver

1 Answer

Onkyo TX-SR500 loosing settings

Turning any receiver off will erase the settings - there is no backup battery (Onkyo uses Battery Free Memory Backup) and the length of time depends on the capacitor charge. Why not just leave the receiver plugged in? Stand-by mode uses a negligible amount of power - enough to keep the capacitors charged and the LED on the front panel on.

Jan 27, 2008 | Onkyo TX-SR500 Receiver

4 Answers

I cannot find the internal backup battery.

I ran into the same issue with my Onkyo 787 receiver that the internal settings would get reset after a short power off. Getting all settings entered again (preferences, speaker distances, volumes, stations, etc.) is a real pain. Good news is that Onkyo DOES have a battery (actually a capacitor) to store the settings and that capacitor can go bad. Another good news is that replacement is quite easy.
The settings are preserved by a 5.5V 0.1F capacitor. Digikey sells it for around $1.50, you may choose a higher capacitance, as 0.3F if you're replacing it. I didn't want to wait for the part, so I decided to replace with something I had around from an old power supply. I used 10V 1000uF capacitor as a replacement and it works fine. Yes, it is 100x less in capacitance, but preserving setting for a short time is better than not preserving them at all. Settings survived a couple of days disconnect and I haven't tried leaving the receiver off for any longer yet.
Here's how you can find it: it's on the main horizontal board, on the same side where the volume control is. It's small, looks like a watch battery turned on the edge. Mine was in a blue shrink wrap. I cut off the leads next to the battery and left the wires sticking out of the PCB. There's plenty of room to put any capacitor.

Aug 13, 2007 | Onkyo TX-DS787 Receiver

2 Answers


If this is an older type receiver, yes there is a special capacitor inside to control the memory. Where it is at is the trouble. I do not remember. You will need to get a service manual to locate it. Good Luck

Jun 30, 2007 | Harman Kardon AVR 630 Receiver

2 Answers

Station Preset Memory Lost When Power Off

Have same unit, exactly the same problem: station presets lose setting when power is off. I've opened the unit; there is no apparent battery of any kind.

As long as the unit is powered up, the station pre-sets seem to hold. There IS a capacitor across the power switch. Some A/C will therefore be transmitted into the unit when plugged in, even with the switch off. If the capacitor is open, no charge will enter the unit when the power switch is open. I will probably replace this capacitor and see if that fixes things, but it may take several days to do so. Has anyone else tried this?

Feb 02, 2007 | Kenwood KR-A5080 Receiver

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