#61
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Never mind the last post about the waveform. Seems it was generating that even after I disconnected the probe. I'm going to give it back to my brother and see if there is somewhere around here that rents them.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#62
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yep, with tvs you can only go so far with voltage readings, wave forms are were its at. put it back together and get some screen shots showing brigtness and the jail bars again.
Scopes are handy but expensive for a good one, you can get decent later models for around 100$ but you risk it not working, case in point my scope just took a dump on me so now I have to fix it. |
#63
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You may just want to try your hand at fixing that scope, its prob pretty simple.
You do need to get a straight trace that reacts as it should. |
#64
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Quote:
I'm attaching a pic of the jail bars and brightness. The brightness is greatly improved with much more available range, so that seems resolved. The jail bars, however, are still there and quite noticeable (even in lighter scenes). I've replaced the two 100K resistors, the 33K and the diode. None had any effect. I have the scope's build instructions and I can go over it. If I'm not mistaken, this thing has tubes in it. I'll take them out and test them.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#65
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This scope has 10 tubes in it! Where to begin.
Well my brother built it, I'll have to enlist his help.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
Audiokarma |
#66
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if the scope has not been recapped it may have issues there.
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#67
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the fact that the horz convergence is not responding (I think that is what you said) and the horz blanking may be causing the jail bars sure points to a problem there. Is the width ok? not too wide?
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#68
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It's been recapped, but I don't know how long ago. I see a combination of electrolytic, film and those "orange drops" in it. I'm seeing my brother tomorrow, so I'll get more info on what's been done to it. He said it worked the last time he used it, but I didn't has how long ago that was.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#69
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Quote:
I've gotten used to no overscan, so this set's image seems too wide. I believe, though, that the overscan is about 6%. I can just see the edge of the 5% line on the overscan pattern.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#70
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I may be missing something here, but why is the scope thought to be in need of repair... the waveform posted looks reasonable, and perhaps the 10 or so "ripples" at the bottom of the waveform might indeed correspond to the 10 or so bands "jail bars" seen across the TV screen?
jr |
Audiokarma |
#71
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Quote:
I recalibrated the scope per manual and I was able to get both of those waveforms in the picture from the SM. However, all other attempts to scope out other points has given me garbage on the scope. I think there might be a short in the 10x probe.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#72
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Quote:
jr |
#73
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I managed to get to good waveforms from the convergence section (easiest to get to and many test points). The forms matched almost completely. Then things went wrong. I think there's a problem with the 10x probe. It's a heathkit, so I'm going to take it apart and see what might be going wrong.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#74
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if you are getting good wave form the 170v pp then trace on through and see if you can see it getting to the base of the blanker
Last edited by DaveWM; 08-24-2013 at 10:26 PM. |
#75
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Quote:
I've ordered a new probe and the BNC to banana plug converter. It should be here on Wed and I'll be able to get more done.
__________________
Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
Audiokarma |
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