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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 6:01 pm Post subject: |
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| Jeremy112 wrote: | Ok sorry mac, I accidently followed the wrong wire, so I deleted my last post as not to confuse us. So many wires in a tight space!
The transformer connects to board 1U-3638-6 |
Thank god. I saw the email and said, That can't be right... LOL.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 6:02 pm Post subject: |
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| Jeremy112 wrote: | Well... heres an interesting update, the board, once I removed it, is cracked in half... COULD THAT BE WHY IT WONT WORK??? 
Wow this guy did a number on this receiver |
Damn, that was to easy. I thought I would be in this for a while. Well at least until you get that fixed and see what happens...LOL.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 6:05 pm Post subject: |
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Working on it now, got it glued together, just need to scrape some laquer and make the connections (and be very careful!)
Also as a side note, it appears as if someone has worked on this board, I can see some more crappy soldering!
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 6:10 pm Post subject: |
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As long as you have the board out, test ic406 and ic404. They should both test short.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 6:11 pm Post subject: |
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One more thing. If you get that board repaired and put it back in and it does turn on, DONT connect any speakers yet.
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RayN999
Joined: 25 May 2010
Posts: 207
Location: Minneapolis, MN
TV/Projector: Sony VPL-VW60 and Toshiba 65H84 CRT RPTV
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| Posted: Wed Jan 25, 2012 6:15 pm Post subject: |
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After I fixed the Marantz SR8000 output & got that to fire up, first thing I did was to check for any AC or DC on the speaker outputs, didn't want to let the smoke out of my speakers prematurely....
Checked and adjusted DC offset for each speaker channel that way before declaring the receiver 'fixed'.
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Ray Nelson
N9QBV
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 6:16 pm Post subject: |
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| RayN999 wrote: | After I fixed the Marantz SR8000 output & got that to fire up, first thing I did was to check for any AC or DC on the speaker outputs, didn't want to let the smoke out of my speakers prematurely....
Checked and adjusted DC offset for each speaker channel that way before declaring the receiver 'fixed'. |
Yep.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 6:24 pm Post subject: |
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| macgyver655 wrote: | | As long as you have the board out, test ic406 and ic404. They should both test short. |
The only 2 ICs on the board are IC403 and IC405
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 6:27 pm Post subject: |
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IC 403 and IC405 do not read shorted, however before I had tested them, after I got the connections all soldered back together, I put the board back in the receiver and hooked it up, plugged it in, turned it on, nothing happened.
When I removed the board to check those 2 ICs the heatsinks they are attached to were warm
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 6:32 pm Post subject: |
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Geez mac, I am once again sorry, I didnt notice the 2 little transistors LOL
Got all this stuff buzzing through my head, I think im still in awe of the complexity! But If I can snap out of it we should be good, let me test them quick!!
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 6:34 pm Post subject: |
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yes they do both read shorted
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 6:50 pm Post subject: |
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Ok, I guess we're not done. Now you have to test the output of that board. Connector CX054, pin 4 is gnd. Dmm on D/C and neg test leed connects there. Pin 3 is +6v. Pin 5 is +5v. let me know what you get.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 6:59 pm Post subject: |
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Pin 3 I get 2.2V and pin 5 I get a dead short. I assume the little dot by the connector signified the 1st pin
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 7:09 pm Post subject: |
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| Jeremy112 wrote: | | Pin 3 I get 2.2V and pin 5 I get a dead short. I assume the little dot by the connector signified the 1st pin |
You need to be sure you know which pins are which. Locate FB408. DMM on continuity test between that(either leg) and the 4th pin on the connector from either way and see which pin shoes continuity. That would then be pin 4.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 7:13 pm Post subject: |
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I was correct, pin 5 is a dead short, pin 3 reads 2.2, at least I do now know that the dot means the first pin, as it should because it usually does in most other electronics i've come across
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 7:15 pm Post subject: |
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| Jeremy112 wrote: | | I was correct, pin 5 is a dead short, pin 3 reads 2.2, at least I do now know that the dot means the first pin, as it should because it usually does in most other electronics i've come across |
What do you mean it reads a dead short?
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 7:17 pm Post subject: |
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from pin 4 to pin 5 it reads as 0.00vdc
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 7:19 pm Post subject: |
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| Jeremy112 wrote: | | from pin 4 to pin 5 it reads as 0.00vdc |
Thats means no output, not short. Dont confuse me, LOL.
Can you disconnect CX054 and test those pins on the board.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Wed Jan 25, 2012 7:22 pm Post subject: |
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| macgyver655 wrote: | | Jeremy112 wrote: | | from pin 4 to pin 5 it reads as 0.00vdc |
Thats means no output, not short. Dont confuse me, LOL.
Can you disconnect CX054 and test those pins on the board. |
My bad! lol
Pin 3 reads +6vdc pin 5 still reads no output
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 25, 2012 7:30 pm Post subject: |
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Locate C410 on there. Set DMM to A/C and a test leed on each leg. what does it read?
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