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Old 1st January 2013, 05:55 PM   #71
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Hi,
First " HAPPY NEW YEAR " to every body. Yes I have another suggestion. Next time please remove the fuse and check the current across the fuse contacts. This way we will find out why the fuses does not blow and how much current the circuit it is using.
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Old 1st January 2013, 09:42 PM   #72
srinath is offline srinath  United States
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Its 4:40 pm and it looks like midnight ... and its been the brightest it has been all day.
Cool.
Srinath.
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Old 5th January 2013, 04:08 PM   #73
srinath is offline srinath  United States
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Across the fuse terminals - I see 72 or so in the 200u setting in the DCA part. So does that mean I have 72 microamps ? Now in the 20m setting, I get .5 - so its a .5 milli amp ? So its a low amperage draw.

I am going to check the rest of the things you mentioned.
Cool.
Srinath.
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Old 5th January 2013, 05:01 PM   #74
srinath is offline srinath  United States
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Removing d453 the pin 4 voltage goes up to 5.6v from 5.45.
I then put d453 back and removed d454, 455 ,456 and 457 - the 4 that are the rectifier bridge. The voltages all dropped to 0, pin 6 and pin 2 went to 0.
Cool.
Srinath.
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Old 5th January 2013, 05:13 PM   #75
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Hi,
The current it is too low. It looked like the transformer is gone. Lets try one more test. Assuming the DC voltage it is 20 so if you solder a 200 ohms resistor to the load side of the fuse and ground you should read 100 ma. It does read read not 100 ma the transformer it is bad. One more thing does the relays have the specs written on top of the relay or the side? That will tell you the voltage of the transformer.
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Old 5th January 2013, 05:16 PM   #76
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Hi,
One more thing can you check in the service manual if it have the specs for the transformer. It may have it.
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Old 5th January 2013, 05:18 PM   #77
srinath is offline srinath  United States
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The relays are 12vdc. You think the transformer puts out voltage, but cant put out current ?
I am thinking I may have a similar transformer somewhere ... but its not a big transformer, cant be that $$$.
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Srinath.
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Old 5th January 2013, 05:22 PM   #78
srinath is offline srinath  United States
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If I shorted the relays, I wont be needing the little transformer - if it is the only issue ... of course I wont have the display. But let me find the right trafo - is a CD player transformer the right voltage ? 12v ?
Cool.
Srinath.
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Old 5th January 2013, 06:35 PM   #79
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Hi,
You do not want to do that. They are using them in the power up sequence. Up to now I think the transformer it is gone.
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Old 5th January 2013, 10:24 PM   #80
srinath is offline srinath  United States
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I cant see it in the schematic - T451 J2812220023X TRANS 120/60 ST-BY <- Has no voltage mentioned.

But since 1 part is regulated by a 5v zener, and the other leg is regulated by a 7806 - is it a decent assumption it is a 12v ac output, and has that split into 2 via c463 and 464 ?

Cool.
Srinath.
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