yamaha rx-v2095 wont power on - diyAudio
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Old 18th January 2014, 11:10 PM   #1
srinath is offline srinath  United States
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Default yamaha rx-v2095 wont power on

I just got the amp, and I am not sure what its past life was like.
When I push the power button, it will click twice almost instantly and the thing never even lights up.
I hear/feel that relay under the fuse click.
Has someone seen this happen.
Thanks.
Srinath.
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Old 19th January 2014, 04:02 PM   #2
srinath is offline srinath  United States
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In this circuit, the relay R801 upon power on instantly shuts off the switch.

What could be at fault ?
Thanks.
Srinath.
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Old 19th January 2014, 07:56 PM   #3
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Remove mains fuse F801 and test the mains power transformer primary for continuity. Might be a blown thermal fuse.

Other than that, some RX-V models are notorious for problems in the standby power supply - usually a little film cap used as dropping "resistance" that's lost most of its capacitance.
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Old 19th January 2014, 09:32 PM   #4
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Hi,
It is possible that the main cpu IC3 it is detecting DC voltage from one of the 5 channels output when the relay RY801 it is enable and immediately disable the amplifier power on. At the top of the drawing for the CPU you can see the Protection signal and the DC detect coming to the CPU. With the voltmeter check pin 36 to see if a dc signal it is coming in. I think it should be zero.
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Old 19th January 2014, 11:08 PM   #5
srinath is offline srinath  United States
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ggrossklass: I will check that, but the transformer probably is fine.

Tauro221: How quickly will that DC detection happen. This shuts off instantly, you press the on switch and you hear 2 clicks ... It may have that DC detect code sitting in the buffer and instantly shut it down ...
I am working on resetting it, then I'll see if it does that.

Thanks.
Srinath.
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Old 20th January 2014, 12:16 AM   #6
srinath is offline srinath  United States
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I am unable to get it into diagnostic mode. It does not even power up for that.
As per manual if it power off within .5 seconds and display isn't provided, the abnormality may be in the power supply for the display.
OK I will find where that is and see if I can isolate and trouble shoot it.
Thanks.
Srinath.
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Old 20th January 2014, 12:59 AM   #7
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Hi,
I do not think you can go to the diagnostic. The micro it is the one that power the main power. The micro has their own power supply feed by the T801. In other word it is powered all the time. I think it is protecting the speakers. See if you can read the voltage coming from the each of the five speakers output when you turn the switch on. Maybe you have enough time to read it. Any one with voltage will trip the relay.
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Old 20th January 2014, 01:05 AM   #8
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Hi,
Another check you can do it is read the voltage at the base of Q802. If you have a constant voltage at the base and the relay dropped them the Q802 it is bad. Also read the voltage at the micro pins 8,29 they should read +5 volts.
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Old 20th January 2014, 01:53 PM   #9
srinath is offline srinath  United States
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I got 13.34 v dc @ center pin of q802, the other 2 are 0.
Let me see if I can get a reading powering it on ...
Cool.
Srinath.
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Old 20th January 2014, 01:56 PM   #10
srinath is offline srinath  United States
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And as I power it up, for a fraction it flashes to 7.6, or 9.6, or 12.5 or something ...
My guess it flashed to 0 for a micro second but I cant catch it ...

The left leg, not the one connected to ground (no idea what is what, that transistor is invisible without removing the board) - @ power up, it flashes 3v, 4v something.

Cool,
Srinath.

Last edited by srinath; 20th January 2014 at 02:03 PM.
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