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Post by mastertech on Apr 5, 2019 14:44:31 GMT -5
Hmm, I am surprised you are not reading any DC voltage. Can you test for DC voltage across caps C708 and C709 on the main board?
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Post by mastertech on Apr 5, 2019 14:48:49 GMT -5
Ok, wait a minute. I think because there is no ground with that harness disconnected is a problem. Can you use a piece of wire to just connect the ground line of that disconnected harness?
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Post by kopraish on Apr 5, 2019 15:44:28 GMT -5
IC700: 1/2/3/=0v, 4pin- 5.3V, 6pin- 0.62V, 7pin- 2.15v, 8pin- 3.5v
Q700 - B-0V, C-48V, E-48V
Q701 - B-49V, C-49V, E-49V
R708 - one side 45.9, other side 50v
AC /between 1pin and 3 pin/ = 76V
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Post by mastertech on Apr 5, 2019 17:18:30 GMT -5
That is much better. But I think that on Q700 the C should be 0 and B should be 48v.
I am curious, leaving everything the way it is still connected, do the relays now close when powered on?
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Post by kopraish on Apr 6, 2019 6:53:20 GMT -5
Sorry my mystake Q700 (C' is 0V'). Now i disconnected only CN751. At this situation, without connect CN751 all white relays work (input relays), the three blue relays, doesn't click.
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Post by mastertech on Apr 6, 2019 10:17:10 GMT -5
Ok, that all seems fine now. So lets look into those amps.
Ohm test R517,R518,R617,R618 and make sure they are all 10 ohms. If they are all good then remove them all, reconnect wire harness CN751 to the power supply, remove Fuse F1 and install your light bulb, power on the unit and see if your lamp goes out.
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Post by kopraish on Apr 6, 2019 11:13:05 GMT -5
R517,R518,R617,R618 are 10 ohms. After removing them, lamp light again.
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Post by mastertech on Apr 6, 2019 14:31:31 GMT -5
Remove Q510 and Q610 and see if lamp goes out.
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Post by kopraish on Apr 7, 2019 8:13:13 GMT -5
After removing Q510/Q610 lamp light again (R517,R518,R617,R618 are removing).
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Post by mastertech on Apr 7, 2019 17:56:53 GMT -5
You did say earlier that the lamp did not light when the final output mosfets were removed, correct?
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Post by kopraish on Apr 7, 2019 23:07:44 GMT -5
Correct. You can see in my first video clip (first post).
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Post by mastertech on Apr 8, 2019 12:29:49 GMT -5
Remove Q509 and Q609 and see if lamp goes out.
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Post by kopraish on Apr 8, 2019 12:51:33 GMT -5
After removing Q509/Q609 lamp goes out. Only inputs relays clicks.
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Post by mastertech on Apr 8, 2019 13:09:01 GMT -5
Did you test Q509/Q609 with your DMM to see if either one is shorted?
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Post by kopraish on Apr 8, 2019 13:12:40 GMT -5
They are perfect, i have 10 pairs brand new.
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