Question about Denon DRA-375RD Receiver

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Need to ID Capacitor

At site C401 of main board. Cap is some kind of polymer electrolytic, but rectangular, not cylindrical. Roughly 9/16"H x 1/2"W x 1/4"D, black plastic case, with flat sheets of polymer/plastic inside. Markings as follows: S 5.5V 0.1F - 6A + This is on the output of a 7806 regulator (IC401). Cap was cracked, regulator ran warm but works out of circuit. Did Denon actually intend to use a 5.5V cap on a 6V rail, or is this an incorrect substitution? Solder joints on cap appear to be factory, but the silkscreen for this part is round. Thanks, Tony

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Re: Need to ID Capacitor

Tony, this is an incorrect substitution. The cap voltage should be higher. They probably ran out of the cylinder types. I'm surprised to see such high capacitance value however.

Posted on Aug 24, 2007

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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

Most of the time, when the receiver is powered up, and after a few seconds, there will be a loud hum and POP from the speakers, the PROTECTOR display will flash. This does not happen every time the unit...

Hi Ted,

First of all, thank you for posting your question here at

"Protector/Protect" is an error code for out-of-regulation condition either on the power supply board and/or on the Sound output circuitry.
I've encountered this kind of symptoms not only on Sony home audio sound system but in almost known brands and the faulty parts are the same >>>> smoothing/filter electrolytic capacitor.
This is very common most especially on older unit because the capacitor begin to dried up resulting to voltage/audio out-of-regulation. In the first stage of fault, warm up will make itself stable but it will get worst as times goes by.
This is fixable and not a costly repair because this is one of the cheapest part on the board and widely available at electronics supply and online. You must have a test instrument (capacitor checker/tester) because not all capacitor that are look physically fine is in good condition, capacitor checker will reveal its condition.
Watch the video below for more info regarding electrolytic capacitor.

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For efficient troubleshooting, you must know which section/board are going to repair. In your case, AC board, DC board, REAR-AMP board, and the mainboard(Sound output circuitry) are going to troubleshoot.


> Check or replaced C905 on AC board - this board is where the AC power cord's directly connected.
> Check or replaced C801, C803, C804, C807, C808, C809 on DC board - this board is where the two larges electrolytic capacitor is located.
> Check all electrolytic capacitor on REAR AMP board most especially in front of IC701(UPC2581V)
> Check the electrolytic capacitor in front and at the back of IC501 and IC601 (both UPC2581V) on the mainboard.

Note : IC501, IC601, IC701 are mounted on aluminum heat sink. Concentrate first on AC and DC board.

Once you've isolated the faulty electrolytic capacitor, your unit will back to normal again.

Hope I helped you.
Rating and feedback are highly appreciated.
Have a nice day! Good luck and take care!

Kind Regards,

Dec 10, 2011 | Sony STR-DE835 Receiver

1 Answer

32" alba flat screen television


The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board.

I do not think it needs replacement, rather some defective capacitors are causing this issue.
Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like ""(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.


Apr 02, 2011 | Audio & Video Receivers

1 Answer

How to replace the electrolytic capacitors on the

If the caps are thru hole rather than surface mounted it should be easy for you.
Make sure cap is properly discharged>>caps are kind of like the 9volt batteries>>> a positive lead and a negitive need soldering skills.
get some >>solder wick and a soldering iron and some solder... heat up contact point with iron while wick is between iron and lead of cap....wick will soak up the solder.........

May 19, 2010 | Harman Kardon AVR 120 Receiver

2 Answers

Loses settings after power off

Garetht, there is a capacitor to maintain your settings. This capacitor may have leaked on your board and can damage it. You should replace it and clean the area around it as soon as possible to avoid problems. The capacitor is located on CPU board and looks like a coin with two terminals.

If you are not experienced with this kind of repair, take the amp to a qualified technician.

Good luck!

Nov 30, 2008 | Yamaha RX-V800 Receiver

2 Answers

Vintage capacitor


The closest substitute I could find is a 19000uF/75V from here. Of course you could also try the original parts manufacturer ELNA America Inc.
  • 5770 Warland Drive, Ste#B Cypress, CA 90630
  • Phone number: 714-761-8600, 800-700-ELNA
  • Fax number: 714-761-9188
  • Email:
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Oct 01, 2008 | Audio & Video Receivers

3 Answers

RX-V800 Shutdown on Function Change

If you can get it to turn on, you can check the problem by holding down the A/B/C/D/E and Right Preset buttons (on the amp not the remote) while turning it on (pressing Standby). This enters diagnostic mode and displays a message. If it says NO PROTECT then the protection circuits have not been triggered (see below).

If it won't turn on at all, try unplugging it and leaving it for a few days to let all the capacitors discharge. You often only get "one hit", so turn iton in diagnostic mode first.

If the dignostic message says "DC PRT nnnn" then one or more amplifier output stages have DC voltage and you will need to identify which one(s) and replace the blown output transistors and any other affected components. They aren't all that expensive, but dismantling this model is a bit of a struggle! However, if it turns on and stays on until you press a button, then the amp output stages may well be OK.

In which case, it is more likely that the microprocessor is detecting a voltage or current anomaly (PS PRT :nnnn or I PROTECT).

I had the same problem and, after replacing all components on the three main power boards, the problem went away until I reassembled it all, then it suddenly started again.

I now think this is possibly a grounding problem. Many of the boards are grounded via the chassis, and after some years use a grounding /chassis screw may get loose or oxidised causing the problem.

I dismantled the amp and soldered a length of hookup wire from a grounding point on each board to a grounding point on the next, so that all of the main boards' grounds are directly connected back to the power supplies grounds. I didn't worry about the front panel boards.

Also replace the 0.047F 5.5V memory backup button capacitor near the top of the input / microporocessor main board (second board from right) as this is prone to leakage, and check / clean any leaked electrolyte from this board. Icouldn't get a 0.047F capacitor so I used a 0.1F 5.5V one.

So far (touch wood) this has worked and I am running the amp as my main receiver for a while to make sure it's fixed the problem.

Hope this helps someone.


Aug 15, 2008 | Yamaha RX-V800 Receiver

3 Answers

Yamaha RX-V750 AV receiver power problem

i had the same problem, only none of the above worked until someone told be to replace the ceramic cap .022 630v c405 on the sub board, and after this mine has worked fine since

Mar 10, 2008 | Audio & Video Receivers

2 Answers

Yamaha RX-V1 Power

Got the same problem and did some searching.
Strange thing is that next day the amp works fine.
This is what I found on

SYMPTOM: The power cannot be turned on, or the protection circuit is activated to turn off the power.
CAUSE: Fluid leakage occurs from the backup capacitor C633 0.047F 5.5V (C662 in the case of RX-V3000/DSP-AX2) on the Function PCB and causes a short with the adjacent components and between patterns, resulting in operation of the protection circuit. Fluid leakage tends to occur with this capacitor particularly with high internal cabinet temperatures, with or without the power on. Often, the leakage is only visible with very careful inspection.

SOLUTION: Two types of backup capacitors are now available with a longer expected service life. When servicing, thoroughly clean the leaked fluid from the PCB and from under any nearby components before replacing the capacitor. There are models other than those mentioned above that use the subject backup capacitor. Check them for fluid leakage and replace the capacitor as needed.
PART(S): Old
Ref. No. Part No. Description Remarks
C633 or
V3860300 ELECTROLYTIC CAP 0.047F/5.5V Vertical type
* VU545000 ELECTROLYTIC CAP 0.047F/5.5V
Horizontal type
Ref. No. Part No. Description Remarks
C633 or
C662 WD294400 ELECTROLYTIC CAP 0.047F/5.5V Vertical type
* WD292000 ELECTROLYTIC CAP 0.047F/5.5V Horizontal type

Nov 29, 2007 | Yamaha RX-V1000 Receiver

4 Answers

Will only power-on after multiple atempts.

That problem is well known problem with a memory capacitor on the stand up board that is the control board. It is .47F 5.5 volt capacitor that resembles a button battery. The cap leaks all over this board the fluid is conductive and corrosive. So the cap must be removed and the board scrubed clean with contact cleaned and dried before replacing with new cap. the unit can run without this cap but if the power should be removed all customer settings will revert to the default. also check the copper ground screws for tieghtness.

Aug 31, 2006 | Yamaha RX-V800 Receiver

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