Question about Pioneer VSX-D507S Receiver

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Powers down it still doesnt work the problem is that the poweringdown message comes on 5 seconds after the welcome message and then the red standby light comes on i really just need to know what attributes i need to check inside of the receiver. can you help?

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If you have a multimeter you can check a couple of things.

I don't have the service manual right now, but will by Monday. So if I am wrong about anything please forgive me I am working off of memory and it ain't so good anymore (LOL)

First look at the amplifier board and the regulator board right in front of the amp board. You should see some components that are about the size of resistors and are yellow. Those are fuses.
there may be around 6 of them, give or take a couple, and spread out across the board, most in one area on the regulator board.
With the power off you can use your multimeter and check for continuity. Set the meter to measure ohms in the lowest setting. They should all measure very close to zero ohms. if any of them show that they are not close to zero ohms and they are open, they need to be replaced. I will get you the part numbers Monday if you need them. It is important to replace them with the same parts. After you get them replaced, you still may have problems. Fuses open for a reason, hopefully it will just be something minor like a little power surge or something and it will be fixed. If the unit goes back into protect (shuts off after you turn it on) you may have a bad amplifier IC.

If I remember correctly this amp uses part number PAC007A for the amp IC. It could be another, but I think thats it. The best way to check the amp IC's is to have the unit powered on and check for any DC offset. You can do that by checking the big 5 watt ceramic resistors for any DC voltage. They will be located right in front of the amp IC's and are white with 3 leads each and are rectangular in shape about and inch or so wide. Be careful not to short the lead to your multimeter across anything and make sure the negative lead is grounded to the chassis of the unit. If yo measure anything above about 0.05 volts on any of those leads it is abnormal. if they measure a large voltage like 40 or 50 volts the amp ic is bad for sure and will need to be replaced. Most times when they go bad all yo need to replace is the amp ic. sometimes the 5 watt resistor will open up as well. you can check those by measuring with the power off the resistance in ohms. Put one lead on one of the outside leads and the other on the other outside lead. It should measure almost like it is shorted. They are only 0.22 or 0.33 ohms, it is labeled on the component.
If you need them I can get that on Monday to.

Let me now if you need more help and don't forget to give me a good rating if this was correct.
If I was wrong, forget you ever seen this post (LOL)

Posted on Jun 21, 2008

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