horizontal width coil, and other odd issues

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nem
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Re: horizontal width coil, and other odd issues

Post by nem »

Good to hear that everything still works.

I wouldn't trust Technotronic to have anything they advertise actually in stock.
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Re: horizontal width coil, and other odd issues

Post by grantspain »

that blooming is normal with most monitors, some handle it better than others
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Re: horizontal width coil, and other odd issues

Post by matt5cott »

Thanks guys, I'll set my expectations accordingly!

He reckons he has one, we'll see 8-)
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Re: horizontal width coil, and other odd issues

Post by matt5cott »

Well I've got the part in my possession and it looks spot on, though it will take me a couple of weeks to get round to fitting it.
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Re: horizontal width coil, and other odd issues

Post by Wurstkopp »

How much did you pay for it if I may ask?
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Re: horizontal width coil, and other odd issues

Post by MrMikeLU »

Hi,

Dont want to hijack anything here, but i also have 2 of those monitors here and since virtualy noone on the net has any schematics or useable expirience with them, its really motivating how you take both roles, asking and helping yourself 😉.
Maybe others got motivated aswell here, so i will post some pics of my problem with the hv-25lm(j).
I cant tell when the problem really started, First was that i used an 220/110v transformer which is not insulated (what is the diference between insulated and isolated) like that one i the cab (pony25). After 20 minutes the screen got miscolored on the left side, i changed back to the original transformer then and it took me like 2 weeks of powering it up 2-3 times a day so the degauss could work its thing but it was never 100% like before and gets discolored again when i dont use jt for a month or so. Anyone knows why it would magnetize so badly or whats happening when one uses nininsulated transformer. Then i wrote down all capitor values and ordered 2 of each and chand them, just all the barell style el ones.
Second thing is, in the middle of all the pots on the chassis there are 2 pretty big pins where one can read service, i connected those ( yeah stupid i know) to see what happens and the picture collapsed to a horizontal line, upon release of the pins picture returned and looked ok but im not sure if its that what started the problem.
Last one was the scart2vga adapter from tim worthington (best video amp), hope you guys knoe about it. It comes with an resistor to use on the 5v line from the jamma psu, since some psus need load on the 5v line to work. Never liked that bulky resistor so i tried if my new psu would work without it and it worked.
I used it like this for about 3 days, 3 hours a day and i was away from the cab for a while and when i came back i found it out of sync. I adjusted the sync but it would loose sync again and again till i cant adjustbut anymore. 3rd day my whole apartment was smelling of burnt electronics. Ok what happend was that if one uses the scart2vga adapter with no load on the 5v line, the psu while working would not regulate the 12v line, so the smell was the adapter almost burning from too much voltage. Ok so the sync problem came from the adapter but also jamma pcbs like raiden 2 would loose sync after those events. After a week or so it worked good again with jamma pcbs ( 10h test).
Ok now comes the moment i realized the problem i want to describe here. The lowest part of the picure starts to compress after 5min of runrime and it compresses really bad after some hours. I will post pictures at startup,
5min and 3 hours. Btw i changed the vertical and video ic and the hot, still the same, dont really know when it started. Hope anyone can help.

Edit: video
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Last edited by MrMikeLU on July 25th, 2019, 9:18 pm, edited 1 time in total.
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Wurstkopp
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Re: horizontal width coil, and other odd issues

Post by Wurstkopp »

Maybe just a cold solder joint on the vertical line pot (labeled V.LIN.).

BTW: Thse chassis have a manual degauss option afair.
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Re: horizontal width coil, and other odd issues

Post by MrMikeLU »

Dont think its about linearity but i will resolder the v.lin pot.
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Re: horizontal width coil, and other odd issues

Post by Wurstkopp »

Could be V. Size too, most definitely a cold solder joint in the v. circuit anyways.
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Re: horizontal width coil, and other odd issues

Post by matt5cott »

Wurstkopp wrote: June 21st, 2019, 8:21 am How much did you pay for it if I may ask?
Sorry I've not been following this thread for a bit, £130~£140 delivered is the answer you seek, so a lot! I've not got round to installing it yet.

Steve at technotronic-dimensions seems a really nice guy, he's clearly frustrated at cheap poor quality Chinese knock offs being produced when he's supplying the real deal 8-) I'll get back to him with my thanks as soon as I've fitted the new part.
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Re: horizontal width coil, and other odd issues

Post by Wurstkopp »

Thanks for the reply, mate. :)
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Re: horizontal width coil, and other odd issues

Post by MrMikeLU »

This time i assembled the monitor on a table, dont laugh about my selfmade stand.
I dont know why but the picture does not compress at the bottom anymore.
Only thing i can imagine with my knowledge is that the vertical sweep gets disturbed from the metal when the chassis is mounted inside the cabinet (voltage drop).
Also possible is that the tube/yoke or the chassis develpe the issue while mounted in that heavy angle like they are in that cab ( just an idea).
The tube got magnetized badly again, cant get it degaussed.
I will place some cardboard under the Chassis when mounting into the cab again but first i want evidence that it can be degaussed perfectly.
Going to rip some coil and thermistor from an tv now.

I can measure 105v on the coil, can i attach my meter leads to the coil pins on the chassis to measure the amps at startup ?? And what is the white round part near the thermistor?
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Re: horizontal width coil, and other odd issues

Post by MrMikeLU »

Couldnt attach this image
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Re: horizontal width coil, and other odd issues

Post by MrMikeLU »

Wired that thermistor to the original coil, no risk no fun. Picture shaked like it should and did a good job but cant get the left side perfect.
Going to turn the Coil 180Deg.
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Re: horizontal width coil, and other odd issues

Post by MrMikeLU »

Ok after 1 hour of pure degaussing, i think its better then i ever knew it, hope its the same when its mounted inside the cab again.
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Re: horizontal width coil, and other odd issues

Post by MrMikeLU »

Anyone knows what this coil is for?
H. Linearity maybe? Thats actually the only thing that could be somehow better. Need some plastic hexagon now.
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Re: horizontal width coil, and other odd issues

Post by PrincessPrinPrin »

It's the line balance coil (sometimes called the differential coil). It adjusts cross misconvergence of horizontal lines:
balancecoil.jpg
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Re: horizontal width coil, and other odd issues

Post by MrMikeLU »

Thank you sir, never heard of such an coil/adjustment.

Too bad its not horizontal linearity since when you look at the crosshatch, the rectangles on the far left look wider a bit compared to the far right ones. Looks like there is no way tonadjust the linearity.
Btw i was playing with magnets and magnet stripes etc, after like 5hours i came up with this crosshach in the picture. Its crazy what can be done to the geometry when placing them on the yoke.
Do the magnets stress the yoke or chassis?
Also the focus on the outer area cant be made better right?

I mounted a modern degauss coil in the meantime also.
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Re: horizontal width coil, and other odd issues

Post by MrMikeLU »

this misconvergence is the price for suberb geometry in the upper left corner which was the worst one before-
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Re: horizontal width coil, and other odd issues

Post by matt5cott »

9 years 5 months 3 days since the OP and both my Horizontal width coils are finally now functional :lolno: :lol:

Image


It pretty much looked like that until this evening, I've now cranked the coils to get the H.SIZE image as small as possible as per below, though it still doesn't appear quite small enough :eh: (though it's off centre, out of focus, pincushion needs adjusting etc!)

Image

Huge step in the right direction anyway, I'll fiddle with the image settings and set it up right in the coming week or so hopefully.
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