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#196
08-08-2023, 07:57 AM
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One thing you can try, remove the plug for the convergence PCB, and do a resistance check from pin 6 on the convergence socket on the chassis to gnd, should be about 1 to 1.5 ohms.
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#198
08-08-2023, 09:50 AM
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plz do the resistance check mentioned above.
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#200
08-08-2023, 12:40 PM
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Sams says that winding is 1.1 ohms, not sure if thats close enough or not, I don't remember if you have the original FBT in there or not.
You may want to do the same resistance test at pins 13-14 on the FBT, if its noticeably lower than the 1.8 you saw at the socket, it may be a sign of a lose solder connection. At this point it would have done you good to have an oscilloscope, to see if you had the good signal at 300v at pin 6 on the convergence socket. That would go a long way to sorting this out.
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#201
08-08-2023, 12:54 PM
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I probed the wrong wire it’s 1.1 ohms and it’s the original flyback.
I’ve tried to post a pic of what the screen looks like but can’t size the pic right to post it. I measured the A19 coil wrong there is .9 ohms on both secondary sides and primary is good 2.6 ohms Last edited by timmy; 08-08-2023 at 04:19 PM.
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#203
08-08-2023, 07:13 PM
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..
" Here’s the voltages V21. I probed the wrong side of v22 it does have voltage. I missed B section of v19 I’ll post the voltages 1 180.6 9 -44 6 352.3 3 123.7 7 180.2 2 123.3 " Timmy, on V21 do pin 2 & 3 really have the same voltage on both pins....? Can you investigate this ? Can you check resistance compare to Sams on these pins? Possible short in the socket, or internal to the tube? I'm not sure about R166, R167, & C116... Not sure what to do with the flyback pulse at this point. I would be happier solving the odd voltage stuff first & being somewhat sure those items look like they are working.... If you guys want to pursue the flyback pulse it's ok, I just don't know how your going to test for it. But we could test for the tube voltages with the tools Timmy has..... Either thing could be just a tail chase anyway.... ..
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#204
08-08-2023, 07:21 PM
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Quote:
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#205
08-08-2023, 10:02 PM
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I just find it a bit odd that all the negative voltages related to that winding are not where the should be, V19 p9 , V4 p3, V21 p9 , there has to be a common cause, right?
Especially when there was that time when pins 13 -14 on the FBT were reversed.
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#206
08-09-2023, 06:38 AM
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Quote:
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#208
08-09-2023, 11:56 AM
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Quote:
What I still find odd, are the abnormal voltages you posted, and what may be the cause. V21 pin 9 @ -44 , should be -130v V4 pin 3 @ - 1.71v should be -10v V19 pin 9 @ -40v should be -75v
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#209
08-09-2023, 12:05 PM
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Quote:
And the 2 resistors and the .01 from the coil on the flyback to the burst gate are good.
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#210
08-09-2023, 12:36 PM
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That “flashing” is most likely due to the DVM being disrupted by the horizontal pulses on that line, an analog meter would not do that.
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Linear Mode
