yamaha RX-V365 Receiver

WLD_Bill

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Mar 24, 2013, 12:28:59 AM3/24/13

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Pressed power button, unit powers off after 3 seconds.

Bypassed protection mode by holding "Effect" & "Night" buttons while
pressing power button.
Unit displayed the code "PRD PRT 210"

Manual states as follows....

When there is a history of protection function due to abnormal DC
output

PRD PRT:xxx (xxx AD value when the protection function is working)

Cause: DC output of the power amplifier is abnormal.

Supplementary information:
The protection function worked due to a DC voltage appearing at the
speaker terminal.
A cause could be a defect in the amplifier.
If the power is turned on with the abnormality unsolved, the
protection function works in about 3 seconds to turn
off the power.

Ideas where to start? LOL.... DC voltage appearing at the speaker
terminal? None showed
up with a DVM

David Farber

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Mar 24, 2013, 11:52:51 AM3/24/13

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Maybe something got lost in the translation. DC output of the power
amplifier will only show up at the speaker terminals if the speaker relay is
energized. It's not clear to me what protection functons are being bypassed
by pressing the "Effect" & "Night" buttons. In other words, check the DC at
the power amp output before it goes to the protection relay. Other than
that, perhaps our resident Yamaha expert, Mark Z. will chime in with some
advice. (-:

--
David Farber
Los Osos, CA

Mark Zacharias

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Mar 24, 2013, 5:22:17 PM3/24/13

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"David Farber" <farberbe...@aol.com> wrote in message
news:kin7em$33h$1...@dont-email.me...

The translation is a bit off. It's trying to say that there WAS a DC offset
at one or more speaker terminals, therefore the protect was activated.
The DC is actually detected BEFORE the speaker relays via sensing resistors
going over to the appropriate DC PRT input on the microprocessor.
The value 210 translates as follows:

divide 3.3 by 255. This equals 0.01294117

Multiply this value times the error code 210. The result (2.717647) is the
voltage seen at that input on the microprocessor. Actually it's quite
accurate - no need for a multimeter here.

The acceptable range (maybe 70 to 125 etc) multiplied the same constant
would give the "normal" DC range that should be seen by the microprocessor.

Bottom line - probably one channel has a DC offset caused by a bad output
IC.

That DC voltage can be measured at any of the white emitter resistors
sitting in front of the output IC's. One white dual resistor for each
channel.

In this case, since it is not an over-current shutdown, the protection
cancel method shown in the manual can force the receiver to stay ON so that
voltage readings can be made.

Enough?

Mark Z.

WLD_Bill

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Mar 25, 2013, 1:51:17 PM3/25/13

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Thank you so much guys. Will post my findings soon.
PS: I've been toggling the power on and off to get readings. Protection bypass
didn't seem to matter, although unit will stay running in firmware update mode.

Regards:
Bill

WLD_Bill

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Mar 25, 2013, 3:42:36 PM3/25/13

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On Saturday, March 23, 2013 11:28:59 PM UTC-5, WLD_Bill wrote:

Measured the center post on ceramic resistors in front of amp i.c.'s
(4) measured .8vdc
(1) measured 52.6 vdc. (front-left speaker output) of STK433-330-E
Replace the I.C. ? Any other offending parts I should look at?

I heard a high pitch sound the other day and thought it was around the voltage regulators on operation board 2. LOL (not even close) It was the STK433-330 I.C. . Oh well, the regulators got a new grease job and the 6.3v 1uf caps checked out good with ESR and LC meters.

WLD_Bill

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Mar 25, 2013, 4:59:08 PM3/25/13

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On Saturday, March 23, 2013 11:28:59 PM UTC-5, WLD_Bill wrote:

Checked Q119 (2n5551c) with dvm. I checked ok.

Naor

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Apr 3, 2013, 11:18:02 AM4/3/13

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responding to
http://www.electrondepot.com/repair/yamaha-rx-v365-receiver-145554-.htm , Naor
wrote:

Hi I have the same problem with my receiver, did you managed to fix it?

Thanks

WLD_Bill

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Apr 7, 2013, 11:09:47 AM4/7/13

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I just ordered a (4) piece lot of the STK433-330. I'm quite sure it will be fine. I will have 3 extras if you want to purchase 1 from me. I'm not sure when they will arrive.

WLD_Bill

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Apr 7, 2013, 11:22:16 AM4/7/13

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On Wednesday, April 3, 2013 10:18:02 AM UTC-5, Naor wrote:

Did you check the voltage outputs of the amp of the (7) protection circuit resistors? They are the white large cement (ceramic) type.

Download the datasheet and it will demystify the the circuit and how it works.
I found it quite interesting, especially the 8 bit code to the MCU stuff that Mark Z explained. I haven't delved much into that yet (just curious) The overvoltage protection circuit is neat how it puts the amps into standby mode, etc..

WLD_Bill

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Apr 14, 2013, 6:17:12 PM4/14/13

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On Saturday, March 23, 2013 11:28:59 PM UTC-5, WLD_Bill wrote:

Update: Amp IC on back order. looking at other sources.

andrews...@gmail.com

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Jan 1, 2015, 3:08:09 PM1/1/15

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Hi did you have any joy with the IC's you ordered?
Have you for any for sale?

Michael Black

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Jan 1, 2015, 4:54:41 PM1/1/15

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On Thu, 1 Jan 2015, andrews...@gmail.com wrote:

> Hi did you have any joy with the IC's you ordered?
> Have you for any for sale?
>

What's it to you?

THis thread is from early 2013, now almost 2 years ago. You weren't
posting when he was having a problems, so why should you care?

And if you really have to dig up old posts to reply nonsense to,
at least have the decency to quote what you are replying to, so
there is context. We aren't all at google, we don't see 2 year old
messages on one single page.

For that matter, always check the date before replying.

Michael