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Post by mastertech on Jun 19, 2017 19:40:01 GMT -5
What do you think, about the IC909? How would I know, if it is bad? I gave you a suggestion on what to do but I did not see where you did the testing. So I stopped responding on that unit.  |
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Post by tibimakai on Jun 19, 2017 20:53:07 GMT -5
Do you mean, to measure all those voltages?
I have measured the temperature and voltages at the IC909. Everything seems fine.
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Post by mastertech on Jun 19, 2017 21:38:01 GMT -5
Test all voltages on pages 88 an 89. There are test points on the board for each voltage. Look at the board layout for their locations. If you test those voltages and no abnormality is found I will see if I can direct you further to find the problem.
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Post by tibimakai on Jun 20, 2017 21:11:55 GMT -5
I'm trying to measure these voltages, but only two are measurable from the top, the rest is underside.
How could I measure those? I will have to solder wires to the test points?
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Post by mastertech on Jun 21, 2017 6:33:25 GMT -5
I will have to solder wires to the test points? yes. |
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Post by tibimakai on Jun 21, 2017 22:55:59 GMT -5
OK, I have found two voltage issues.
V+1R8_SC is only 1.43V.
V+1R2_NW is only 0.012V.
It was quite some work, to do these measurements.
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Post by tibimakai on Jun 21, 2017 23:02:55 GMT -5
IC9502 most leky is bad.
At pin #6, I have 2.45V and at pin #1, only 0.013V
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Post by mastertech on Jun 22, 2017 7:36:12 GMT -5
What is your voltage at pin 3 of 9502?
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Post by tibimakai on Jun 22, 2017 19:35:55 GMT -5
I'm getting 1.21V.
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Post by mastertech on Jun 22, 2017 20:00:28 GMT -5
That looks good. Can you lift the output pin so it is removed from circuit and test for voltage? And try not to break it. If you do not think you can then we can remove some other parts for testing. You do not want to break it yet because it might be ok.
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Post by tibimakai on Jun 22, 2017 23:47:40 GMT -5
You are thinking, that maybe the output gets shorted, by another component?
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Post by mastertech on Jun 23, 2017 7:11:29 GMT -5
It's possible but you need to verify. It could be the regulator but why just change a part just to find out it is not that. Easier to just verify first.
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Post by tibimakai on Jun 23, 2017 10:15:10 GMT -5
Afternoon I will check, when I get home.
It would be good to work this IC, because it is not available.
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Post by tibimakai on Jun 23, 2017 19:46:25 GMT -5
The regulator is good.
Unfortunately the short goes most likely, into IC9204( DM860A ).
I have removed L9206 and I still have short on both ends. 0.35 Ohm toward the regulator and 0.54 toward the IC9204.
I have lifted the positive leg, of the C9314 and the short is still there.
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Post by mastertech on Jun 23, 2017 19:57:20 GMT -5
You need to also remove L9209 and L9210 and see if short on regulator output pad is gone.
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