Question about Onkyo 630-Watt 7.1 Channel Home Theater Speaker

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GETTINF OVER HEAT

HEAT SINK GETTING HOT ON ONKIO MODEL TX-DS939 POWER SUPPLY

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Onkyos are notorious for running a bit warm - though if yours is excessively warm, double-check the impedance of, and wiring -to- your drivers.

Posted on Dec 02, 2008

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ONKYO TX-DS939 (sound and heat/fan issues)


This sounds like the amp is seeing too small an impedence load. In other words, the amp is expecting to see an 8ohm load and is being presented a 4 or 2 ohm load. This will force the amp to work really hard and generate excessive heat. Does the amp generate sound at all? ever? If not, then you probable have a situation with high frequency oscuillations that you can not hear. This means that the amp is sending out a lot of power to the speakers that the crossovers are shunting to ground. Without seeing the output of the amp with a scope, I can not confirm this. This is not a problem that will be solved remotely. Bring the unit to a shop and request that the output be examined using a scope to check the waveforms. I suspect that a bad feedback look internally is causing the generation of the high frequency signals.

Keep us posted.

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Oct 29, 2008 | Onkyo TX-DS939 Receiver

2 Answers

Onkio receiver


The usual cause of this is shorted output transistors. If you have experience with repairs and can solder, you should be able to repair this yourself. Open up the unit and look for the 3-legged parts attached to the heat sink. These are the output transistors. Post here the markings on those parts so I can give you the entire part number. In order to determine the bad ones, you should have an ohmmeter or diode checker. Post the parts markings and we'll continue from there.

Dan

Aug 14, 2008 | Onkyo Audio Players & Recorders

1 Answer

Onkyo TX-DS939


I have to ask the obvoius, did you get the manual, have you used the onscreen menu to set up the speakers, you can calibrate the speaker levels on the TV screen if you use the S video or RCA vidoe connection .have you turned off tape monitor?

Apr 27, 2008 | Onkyo TX-DS939 Receiver

1 Answer

Desply and sound gos off Onkyo TX-DS939


On my device there were quite a few bad solderings on power card. May be you have the same and it does not tolerate heat. Power card is that horizontal one on top, when you open the box. It is easy to remove so that you see under the card to check those solderings. One screw from left side of case, which holds that noise eliminator on AC lines, six screws from back keeping those connectors and four screws away from board corners. I disconnected only that connector in the middle of card, because it was a bit tight. Then I was able to turn that card upside down and after some fixes to those bad solderings device is like new again.

Apr 23, 2008 | Onkyo TX-DS939 Receiver

1 Answer

Onkio TX-SR500 don't leave stand-by


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.

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+22v line is missing. Check for 22v at R9207, not present check R9201,2 0.22ohm, R9203-6 1 ohm. Check also Q9201 12v reg ic, it supplies the led in the volume ctl. While your in there, solder up any cracked solder joints, bad connections.

Nov 04, 2007 | Onkyo TX-DS939 Receiver

1 Answer

Need to buy the jumper plug


What do you mean by a jumper plug. Are you referring to the preamp jumper plugs?

Sep 01, 2007 | Onkyo TX-DS939 Receiver

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