Question about Onkyo TX-SR500 Receiver

4 Answers

My Onkyo TX-SR500 receiver stays in standy/on mode.

When I press the standy/on button it clicks and for a moment I can see the volume level and then the unit goes back into standy mode and the unit will not turn on. Thanks

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  • gwalbert May 11, 2010







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    With the unit unplugged, remove the top cover and use an
    ohmeter to check the 10 power transistors on the large heat sink; Q6050 thru 54 and
    Q6060 thru 64. If you find blown transistors (R<1 ohm from E to C) you'll
    need to replace them. After removing a shorted transistor, lso check the associated large ceramic current sharing resistors,
    R6100 thru 04 next to the output transistors. These are dual 0.22 ohm, 2W
    resistors that typically fail open if overstressed. These are both common
    failures resulting from overloading the speaker outputs that will cause the
    proctection circuit to shut down the power supply at turn on. Good luck.



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4 Answers

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It may be your amplifier protection circuitry is being activated and shutting down automatically. This is usually caused by a faulty output transistor in one or more of the channels. I recently repaired my Onkyo TX-SR500 which had this problem.
Using a multimeter on ohms check between C and E on each of the ten output transistors. I found Q6051 and Q6061 to be short cct on all pins. Once you have located the faulty channels check the adjacent components for open or short cct.

I replaced the following components,
Q6051 (2SD1047)
Q6061 (2SB817)
R6091 (2.2ohm fusible)
R6081 (2.2ohm fusible)
R6101 2x 0.22ohm 2W
Q6031 (2SD2061)

The amplifier now works perfectly, cost of the parts is about $15-$20.
If you don't feel confident doing this yourself just find a friend or tech who can do it for you.

Posted on Sep 03, 2009

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Hello.
I have TX-SR500E and similar problem. When I turn on my receiver it stays on but doesn't get information from my DVD players (digital and optical connecton; PCM or PROLOGIC, etc), video from my DVD players is showing through my onkyo on my TV but there is no sound coming from receiver! Tuner doesn't work either, sound from tuner doesn't come out to my speakers.
Everything works perfectly few months ago. Nothing changed since then. Few months ago, receiver sometimes lose sound when I listen to the radio but after 10 seconds sound is back. Then I switch from tuner to DVD and back to tuner and there was sound on. Soundless period was growing and now there is no sound at all.

Can you help me to solve my problem?

Posted on Dec 11, 2009

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I replaced the following components,
Q6051 (2SD1047)
Q6061 (2SB817)
R6091 (2.2ohm fusible)
R6081 (2.2ohm fusible)
R6101 2x 0.22ohm 2W
Q6031 (2SD2061)

HI: SKIPA70:
Could you please let me know where to buy above parts? my email: pennhu@gmail.com Thanks a lot.

penn

Posted on Feb 19, 2010

  • skippa70 Jan 20, 2014

    I purchased the parts from WES Components in Sydney, Australia. They should be available from most electronic component suppliers.

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Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} With the unit unplugged, remove the top cover and use an ohmeter to check the 10 power transistors on the large heat sink; Q6050 thru 54 and Q6060 thru 64. If you find blown transistors (R<1 ohm from E to C) you'll need to replace them. After removing the shorted transistors, also check the associated large ceramic current sharing resistors, R6100 thru 04 next to the output transistors. These are dual 0.22 ohm, 2W resistors that typically fail open if overstressed. These are both common failures resulting from overloading the speaker outputs that will cause the proctection circuit to shut down the power supply at turn on. Good luck.

Posted on May 07, 2009

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