SS, Instruction Manual, English, Page, MB (PDF). SSD, Instruction Manual, English, Page, MB (PDF). SS, Instruction Manual. Iwatsu SS scope looking for a new home, hasn’t been touched in a year or two but was all up and running when last used. Scope only, no. Hi there. I have an Iwatsu SS scope, which has just developed a focus issue. It’s not had much use in recent years. Othewise, appears to.
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Discussion in ‘Troubleshooting and Repair’ started by Sinewave, Feb 15, Iwatsu SS Reply to Thread. Search Forums Recent Posts. Feb 15, 1. I have an Iwatsu SS scope, which has just developed a focus issue. It’s not had much use in recent years.
Othewise, appears to work just fine apart from keeping a trace in focus. It’ll start sharp, then go out of focus, I can ‘chase’ it into focus, but it’ll wander again. Have tried the astigmatism but it’ll go out of focus again.
I think somewhere I may have the manual for it, but I don’t think it’ll be a service manual. Feb 15, 2.
I would be looking very critically at the electrolytic capacitors inside the unit. Feb 16, 3. I just found this, couldn’t reply to it to ask him how he got on. Feb 16, 4. That’s a newsgroup posting from Newsgroups are read-only here, and the chances of getting back to him are slim.
Here are a few links that may be useful: Feb 16, 5. Thanks Steve, I’ll take a look at those. Feb 16, 6. The manual has service and maintenance instructions and schematics.
So pretty much ss5711, between myself and any help I can get here, I’ll hope to get it sorted. In the CRT schematic there’s the circuits for intensity, focus and astigmatism. The astigmatism affects focus also, so perhaps it’s best for me now to try and trace around the focus and astig circuits and check components. Feb 17, 7.
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Be careful, the voltages around there can bite. I’d have a close look at electrolytics in the power sx-5711, and the sections of the circuit you’re working on first.
As I advised, I’d probably check all of them. Do you have access to an ESR and capacitance meter? Feb 17, 8. Well my Fluke measures capacitance but not ESR.
I had a glance at the caps, nothing looked odd, but the values may not be as they should. Feb 17, 9. So doing a spot of research suggests that with my capacitance meter, it may show a cap to appear to be fine, yet the series resistance may actually show that it isn’t.
I may have to invest in an ESR meter. Thing is at the moment I’m working in cramped areas, moved house a year ago and it still looks as though I moved in last week I need to invest in a plastic fold away table and antistatic mat to really take this thing apart. Feb 17, Another update, which may point me in a certain direction, is that the calibration point which should read 0.
Feb 21, I’ve found a poly cap with a crack in it, otherwise, physically things appear ok, but I’ve no other way of testing the caps apart from my capacitance meter, which shows them as fine, but as we both know they may have developed a resistance.
I’ll pop some photos up in a bit, I’ll see if I can get a good photo of the cracked cap. Here we are on the bench Power supply board out Cracked cap.
Feb 22, Anywhere that might be connected with the problem? Are there electrolytic capacitors that are near heatsinks or other hot parts? I’m concentrating on this because it has been reported as a known issue, and is a simple one that you should try to eliminate first.
If you were around the corner I’d come over with my ESR meter. Feb 23, With my multimeter set to read capacitance, I’m getting between and mic farads for a mic farad electrolytic cap – so reads ok. But on an LCR meter, at Hz, it’s reading At the very least, I’d compare the readings of your LCR meter with your capacitance function using a known good capacitor.
I presume both of these measurements have been taken out of circuit?
Do you have another scope? Here is a method of testing ESR. It’s essentially what the ESR meters automate. Feb 24, Hi yes I took some readings in the same manner from a known good cap.
Readings were done with one end desoldered out of circuit. I’ve got a diode measuring Fluke on diode range 2.
I think it’s a Schottky diode, manual says 1SS16, but I can’t find one or cross reference one. There’s no other specs in order for me to find one myself. That’s the one, sticking up.
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Service manual only says its a 1SS Feb 25, Do you have the schematic? What symbol does it show for this device? That meter looks like a good tool. Probably out of my price range though. You must log iwatsk or sign up to reply here. Ask a Question Want to reply to this thread or ask your own question? You’ll need to choose a username for the site, which only take ss-711 couple of moments here. After that, you can post your question and our members will help you out.
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