Main > Monitor/Video Forum
Some New Updates on the monochrome 9 monitor !!!
Rub87:
Hi,
Old post reanimated.
So I have actually a cnc machine w this monitor, its a old Deckel FP4NC with a Sinumerik 3M control, I got it for a little more then the price of the iron and as one could have guessed it didnt work anymore. After taking it down and finding some issues and replacing a few caps it worked again. I renewed all the broken bulbs in the thing and cleaned/resealed the linear glass scales.
So since a year or so the machine has worked
Perfect up until 2 days ago while I was working the monitor died. It just went black.
Before it did it did also have the slightly angled horizontal stripes on it after a cold boot for about 5 minutes. Once warm the tube was perfect
I must give a big thumbs up to the topic starter for drawing this diagram. Its the first crt ill try to repair and after searching for days to find nothing in terms of diagrams this is like an oase after 2 days without water in a desert
Id guess my best guess is to first see if the high voltage is still there? I thought to connect a sparkplug to the red anode wire and power the thing up briefly. And then check the supply voltages to these tda IC’s?
Maybe because its my first post I cnanot attach some photos of the tube in action.
PL1:
--- Quote from: Rub87 on September 06, 2024, 03:45:04 pm ---Maybe because its my first post I cnanot attach some photos of the tube in action.
--- End quote ---
If you're getting some sort of "failed security check" error message, try resizing or cropping the image by about 3-5%. :cheers:
Scott
Rub87:
Ok here we go.
This is the screen when it was still working. Superficial stripes. When cold they are alot more present
Rub87:
The high voltage doesn’t seem to be completely missing. :lol
Ill now try to check the supply to the TDA IC’s
Ok so I checked the supply at the TDA, its a bit over 4v. the LM317 is outputting like 4.5v. is this meant to be so low? in the TDA datasheet it says typical supply is 12v. input of the LM317T is 15.1V so thats good.
buttersoft:
Err, are you shorting that HV lead to ground, effectively? Never good to run a chassis without a proper load attached, especially the HV section. If you want to run it without the tube, you should look up the light-bulb trick. I'd detail it here, but i've never had to do it and would probably get some of the details wrong.
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