06-04-2021, 03:35 PM
Hi.
Well the D16T is back on the bench. I've opened up the Line Scan Transformer can and found a problem with the wiring. This is odd as I thought it was potted but in fact no, its covered in a cardboard composition that was hard and brittle, the smoke was from a small bad joint that nearly caught the cardboard on fire....... one to watch. This has now been repaired and sealed.
Next was to look at the couple of sliders that were faulty, one was badly contaminated with a build up of dust and debris I have cleared all of this and I thought I'd try and lubricate them, I have some lanolin grease and this is allegedly good for electrical contacts so I gave them a light smear, the controls now feel very smooth and are giving a nice noise free operation, so that is good progress.
The Focus control though could be faulty but unfortunately I am not in a position to properly test how it is working as the CRT is now so low even with the lights off and window blind shut It's so dark and even a tiny amount of brightness the picture inverts. I might try the safe boost process and see if I can get some more emission, I do think the issue is the CRT is gassy and getting worse. I cannot test this with the MW6-2 as they need their own focus coils.
My own MW22-17 in the TV22 is poor as well and doesn't focus very well so not really suitable for a test. There is no 9 inch tubes at my late friends in Sorn, I suppose I could borrow a CRT from one of the sets in the museum though.
Tomorrow I'll do the frame blocking oscillator transformer swap and see what transpires there.
Well the D16T is back on the bench. I've opened up the Line Scan Transformer can and found a problem with the wiring. This is odd as I thought it was potted but in fact no, its covered in a cardboard composition that was hard and brittle, the smoke was from a small bad joint that nearly caught the cardboard on fire....... one to watch. This has now been repaired and sealed.
Next was to look at the couple of sliders that were faulty, one was badly contaminated with a build up of dust and debris I have cleared all of this and I thought I'd try and lubricate them, I have some lanolin grease and this is allegedly good for electrical contacts so I gave them a light smear, the controls now feel very smooth and are giving a nice noise free operation, so that is good progress.
The Focus control though could be faulty but unfortunately I am not in a position to properly test how it is working as the CRT is now so low even with the lights off and window blind shut It's so dark and even a tiny amount of brightness the picture inverts. I might try the safe boost process and see if I can get some more emission, I do think the issue is the CRT is gassy and getting worse. I cannot test this with the MW6-2 as they need their own focus coils.
My own MW22-17 in the TV22 is poor as well and doesn't focus very well so not really suitable for a test. There is no 9 inch tubes at my late friends in Sorn, I suppose I could borrow a CRT from one of the sets in the museum though.
Tomorrow I'll do the frame blocking oscillator transformer swap and see what transpires there.
