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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Mar 12, 2015 9:37 pm Post subject: |
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Ok, remove C84 from the board and then test across the pads on the board.
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Thu Mar 12, 2015 9:52 pm Post subject: |
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removed it, the -20v fuse pad now reads .434
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Mar 12, 2015 10:02 pm Post subject: |
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| Nashou66 wrote: | | Luuk neele wrote: | | removed it, the -20v fuse pad now reads .434 |
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'What does it do across the capacitor pads on the board? That is what mac is asking.
Check that for continuity as well as with the diode.
Nashou |
Yeah, he did not do what I asked but he jumped ahead and the short is now gone. But were not done yet. 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Mar 12, 2015 10:05 pm Post subject: |
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| Luuk neele wrote: | | removed it, the -20v fuse pad now reads .434 |
As I noted above to nash, you do have some problems following instructions, LOL.
So I see the short is now gone but you do have to do a few more things on that board. So pull it back out.
Now locate C85, should be right there nearby also and do a diode test across it.
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Thu Mar 12, 2015 10:06 pm Post subject: |
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| macgyver655 wrote: | | Nashou66 wrote: | | Luuk neele wrote: | | removed it, the -20v fuse pad now reads .434 |
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'What does it do across the capacitor pads on the board? That is what mac is asking.
Check that for continuity as well as with the diode.
Nashou |
Yeah, he did not do what I asked but he jumped ahead and the short is now gone. But were not done yet. |
sorry, i sometimes confuse things as i am not a native english speaker.
However a continuity test (with the board out) gives me no beep on the pads. it just silently stays at "1"
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Thu Mar 12, 2015 10:08 pm Post subject: |
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| macgyver655 wrote: | | Luuk neele wrote: | | removed it, the -20v fuse pad now reads .434 |
As I noted above to nash, you do have some problems following instructions, LOL.
So I see the short is now gone but you do have to do a few more things on that board. So pull it back out.
Now locate C85, should be right there nearby also and do a diode test across it. |
reads .678 on c85
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Mar 12, 2015 10:08 pm Post subject: |
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| Luuk neele wrote: |
sorry, i sometimes confuse things as i am not a native english speaker.
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OH, ok, that explains it, sorry.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Mar 12, 2015 10:10 pm Post subject: |
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Ok, 1 more thing to test. CR17 should be near there also. has 3 legs. Do diode test across various legs looking for a short.
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Thu Mar 12, 2015 10:14 pm Post subject: |
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| macgyver655 wrote: | | Ok, 1 more thing to test. CR17 should be near there also. has 3 legs. Do diode test across various legs looking for a short. |
reads .673 on cr17
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Mar 12, 2015 10:31 pm Post subject: |
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| Luuk neele wrote: | | macgyver655 wrote: | | Ok, 1 more thing to test. CR17 should be near there also. has 3 legs. Do diode test across various legs looking for a short. |
reads .673 on cr17 |
There are 3 legs. give me some more readings.
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Thu Mar 12, 2015 10:41 pm Post subject: |
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bottom two legs read 1.932
left leg and top leg read .673
right leg and top leg read.673
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Thu Mar 12, 2015 10:59 pm Post subject: |
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was my second measure okay?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Mar 12, 2015 11:05 pm Post subject: |
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Those numbers look fine. Should you should be done with testing. And the +40v line tested ok so now you can order parts.
So I have:
2) 75kohm, 2 watt resistors
1) 2.2uf Tant SRF mnt
1)LM320T-12
Whatever fuses are needed.
I would change that regulator even though it did not test shorted. Also, the 2 watt resistor may be a little tight in between those 2 caps but if the legs are long enough you can get them mounted ok.
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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| Posted: Thu Mar 12, 2015 11:09 pm Post subject: |
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thank god i have an SMD rework station with a hot air gun so i can mount surface modules.
ill have to see where i can order those parts. which regulator did you mean?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Mar 12, 2015 11:10 pm Post subject: |
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The one that you already have removed. You said it came out by itself.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Mar 12, 2015 11:14 pm Post subject: |
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| Luuk neele wrote: | thank god i have an SMD rework station with a hot air gun so i can mount surface modules.
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I just use 2 soldering irons.
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Luuk neele
Joined: 04 Mar 2015
Posts: 186
Location: Wijk bij duurstede, the Netherlands.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Mar 12, 2015 11:40 pm Post subject: |
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You need a 320. Your link is for a 340. So no, that will not work.
The cap has enough voltage but you need to check the size to make sure it will fit on the board. You don't want one to big that you cannot solder in on correctly.
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