ady
Junior Member
Posts: 45 
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Post by ady on Nov 20, 2016 2:45:52 GMT -5
Hy. I have one Denon 3808A and works only in analog mode.
No HDMI, no digital.
When i make the test with up/down and poweing on - shows an error (which from the service guides says
)
① Sub-μcom NG No response from Sub-μcom " □ ＳＵＢ □□ ＥＲＲＯＲ □０１□ "
Can this be repaired ?
Thanks!
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Post by mastertech on Nov 20, 2016 19:57:30 GMT -5
What are all your voltages on CW118 and CW122?
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ady
Junior Member
Posts: 45
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Post by ady on Nov 21, 2016 12:14:46 GMT -5
c122 pin 1 is white dot and negative from massive radiator
1-5.33
2-5.25
3-0
4+5-0
6+7-6.24
8-5.3
9-5.25
10-0
11-5.3
12-0
cw118
1-0
2-0
3-2.7
4+5-0
6+7-0.29
8-5.3
9-5.36
10-5.52
11-6
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Post by mastertech on Nov 21, 2016 16:45:02 GMT -5
I see your CW118 pin 3, SCPU+5v is also low at 2.7v. This will probably take some effort to find. Are you wanting to put in the effort?
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ady
Junior Member
Posts: 45
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Post by ady on Nov 22, 2016 3:41:11 GMT -5
Hy. I want to repair and if you help me, maybe the 3808 will work again.
I was curious what the other two colleagues did.
If they changed the 1u-3799 and the problem still persist, or the 3799 is the problem.
Thanks.
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Post by mastertech on Nov 22, 2016 11:27:37 GMT -5
Well normally we would trouble shoot this in an orderly fashion but in this case I want you to jump ahead and check something first.
Go to the Digital board (1u-3799) and locate ic959 and remove it. Then go back and test the voltage on CW118, pin 3.
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ady
Junior Member
Posts: 45
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Post by ady on Nov 22, 2016 13:12:07 GMT -5
i will. but 3.3v derives from scpu5v and instead 5v the scpu5v have 2.5v (pin 14 - pin15 at cw 159).
scpu5v parts from tr715 found on 1u-3804-2 (1/2).
the tr715 feed from master5v (and i mesured and have 5v). but tr715 it's trigger by tr714.
tr 714 feeds from scpupower.
i must veryfi scpupower
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Post by mastertech on Nov 22, 2016 13:32:49 GMT -5
No, TR715 is not populated. Either we have a language barrier or you are not reading the schematic correctly.
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ady
Junior Member
Posts: 45
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Post by ady on Nov 22, 2016 13:54:25 GMT -5
i didn't follow the lines correctly on my tablet.
and i am new on this.
thanks
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ady
Junior Member
Posts: 45
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Post by ady on Nov 23, 2016 10:34:12 GMT -5
i did like you said and now is 5.19v.
what next?
thx
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Post by mastertech on Nov 23, 2016 12:10:42 GMT -5
Did you try testing IC959 after you removed it with your DMM?
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ady
Junior Member
Posts: 45
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Post by ady on Nov 23, 2016 12:18:54 GMT -5
no my friend because i don't know how.
please tell me how and i will verify.
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ady
Junior Member
Posts: 45
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Post by ady on Nov 23, 2016 12:38:07 GMT -5
i've put 5,4v on the input pin and on the output i have 3.25v
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Post by mastertech on Nov 23, 2016 12:45:46 GMT -5
i've put 5,4v on the input pin and on the output i have 3.25v This should be fine for the test. Can you post a picture of your board where you removed that ic? |
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ady
Junior Member
Posts: 45
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Post by ady on Nov 23, 2016 13:09:11 GMT -5
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