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Old 30th December 2012, 12:57 AM   #41
srinath is offline srinath  United States
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Yea I dont believe I measured voltage @ FC454. I will need to get ~3.4v ac there right ? I will post tomorow, I have it apart right now. Will refit it and get that reading.
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Srinath.
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Old 30th December 2012, 02:44 AM   #42
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Hi,

It is possible that the voltage it can be 12 volt AC. They feed the relay coils but I do not know what it is the voltage of the relay coils. That it is why we need the fuse voltage so we have an idea of the voltage.
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Old 30th December 2012, 12:48 PM   #43
srinath is offline srinath  United States
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I will measure it in a bit sir.
I have powered it up unassembled - the way it is right now, so might as well do that to get this reading.
I will do it in a few and get back to you.
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Srinath.
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Old 30th December 2012, 02:06 PM   #44
srinath is offline srinath  United States
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Its reading .4 volt ac @ the fuse. Yea its dead.
Now what else can cause that to happen other than a dead trafo ? I guess I am pulling that board off today and checking it.
I do have 120+v going into that from the power cord. I will check for blown up stuff, else I guess I need that little trafo. How to find out what its ratings are ?

Cool.
Srinath.
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Old 30th December 2012, 02:50 PM   #45
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Hi,
In one of the thread you mentioned that the transformer it was getting hot. Does still get hot? Just in case remove the fuse F453 and read the voltage and see if still read zero. Something it is not right. You post that pin 4 has 5.5 volt. That voltage it is coming from the transformer unless the micro it is feeding it back.
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Old 30th December 2012, 05:22 PM   #46
srinath is offline srinath  United States
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13.3 volts ac without the fuse in. And the trafo dont get warm, of course the fuse being in, makes it warm real quick and ... man you are freaking brilliant. Trafo is fine, I got a bleeding short somewhere ... OK more pouring over the schematic, and no damn powering it up till the short if found and fixed ... I'm a bit slow, but I know better than to power up a known short in the amp.

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Srinath.
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Old 30th December 2012, 05:23 PM   #47
srinath is offline srinath  United States
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That is 13.3 to ground, being center tapped to gorund.
Cool.
Srinath.
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Old 30th December 2012, 06:15 PM   #48
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Hi,
That it is good news. Now read the resistance after the other side of the fuse for Low resistance. Low resistance mean something it is loading the voltage. Did you check those 1N4003 diodes for short?
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Old 30th December 2012, 06:25 PM   #49
srinath is offline srinath  United States
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I have not tested them yet, but of course I am going to now.
I had too many interrutions, like the grocery run and friend of mine showed up with a Old 40lb magnavox cd player that wasn't reading disks. Yea had a tda1540 dac, but not reading disk.
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Srinath.
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Old 30th December 2012, 07:27 PM   #50
srinath is offline srinath  United States
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I managed to get all the 10 diodes on that board checked, and they all tested good.
I also pulled the connections from that board and powering it up, and none of the connections made any difference to the voltage @ that fuse.
So the short problem is in that board.
Cool.
Srinath.
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