Wei-Ya on an MS8 not working properly!

[notsonic]

MEANT TO POST THIS IN MONITORS

i made a thread about this a long time ago on killercabs, and never got to fixing the situation. I got a new cabinet for high res games, so while I was putting the original chassis back on the tube, i took pictures of everything. basically the problem was that no matter what adjustments i made, the picture in 31khz would not stretch horizontally wide enough to fill the screen. the monitor is in my new astro city.

This is the tube:



this is the yoke connector, totally different from the ms8's and 9's ive seen used for chassis swaps:


this is the original chassis:


and this is the wei-ya tri sync chassis:



my problem was that the width of the picture in high res would not stretch wide enough to cover the screen. it came to about a quarter inch on both sides. vertical was fine. the only way to get it as wide as it got was turning up the b+ voltage for both 15khz and 31khz. (the 15khz pot affected the 31khz picture.) aside from being squished on the side like many people have reported, the low res picture was good. obviously with the b+ turned up it got too wide.

any ideas?

[cools]

Ordyne can fix this for you - the chassis needs modification to get full width.

Quick search shows it http://www.arcadeotaku.com/forum/viewto ... 838#p14838"

[notsonic]

weird thing is that i had no problems with the 15khz width, only the 31khz.

[grantspain]

yeah,you need to change the value of one of the high voltage caps and i know its C84,but i do not the value to put in
you could try asking ordyne,he may tell you what value you need

[dmauro]

I just checked and my tube has the same sticker on it with the same A68KJU96X number, but below that it has 5E instead of 4D. The AC 100v sticker is the same as well, although my SEGA part no. is too dusty or something to read. So I think you've definitely got the standard tube. Someone must have had to replace the yoke wires or something. Those are definitely different than what I've got. If the nanao works though, the Wei Ya should. Sounds like you've just got to get that modification mentioned.

I'm not having width problems in 15KHz or 31KHz. :/

[grantspain]

dmauro whats the value of caps C84,C85,C86
i have these as c84-115j/250,c85-103j/2k,c86-394j/400

[notsonic]

my best guess is that the 4d/5e discrepency is the difference. different yoke on the same tube.

is your original chassis the same as mine?

i dont think ill be trying to make it work with this tube again as the picture from the nanao chassis is too perfect. dont plan on sticking high res games in the astro anymore. cps2 needs a home.

with that said im going to try to put the chassis on the ms9 from my cyberlead, provided it works.

[Ordyne]

It will work fine on your MS9, just not on the MS8..

Not sure where you bought it from but they obviously never test these things !

[dmauro]

is your original chassis the same as mine?

I didn't look at the number, but it looks just like it. Yours is just a little cleaner

Good luck with it in the cyberlead.

Grantspain, I don't have a tool to measure those. My multimeter is a cheap analog one and I wouldn't even know how to get those readings.

[grantspain]

its not important now to check the values as notsonic is not gonna install the chassis BUT for future reference these numbers are printed on the side of the component

[notsonic]

before i put the chassis in the ms9 ill take down the cap values.

[tinchen3112]

thats very interesting.
i really like to know which value need this c84 cap.... is this the only one which must changed? where is it on the pcb?
maybe somebody know which cap has to be changed if the vertikal size is too much on a wei-ya c3129 ?

tinchen

[grantspain]

thats very interesting.
i really like to know which value need this c84 cap.... is this the only one which must changed? where is it on the pcb?
maybe somebody know which cap has to be changed if the vertikal size is too much on a wei-ya c3129 ?

tinchen

you have to be real careful when changing the value of these high voltage caps as it affects the x-ray protection circuit,c84 affects the width btw
ordyne can modify this chassis for you to fix the vertical size issue

[tinchen3112]

if i know the value, i can change the cap, too.
i´m firm with soldering...
if ordyne would make this for me, i have to send him the tube, too, couse it is a tv toshiba tube and not the ms8 one.
the shipping would be very expensive from germany to uk.

[grantspain]

if i know the value, i can change the cap, too.
i´m firm with soldering...
if ordyne would make this for me, i have to send him the tube, too, couse it is a tv toshiba tube and not the ms8 one.
the shipping would be very expensive from germany to uk.

you have a ms9 tube?
if you do and your vertical is far too high then either you have a faulty chassis or the b+ is set incorrectly

[Ordyne]

I've never seen height issues on either the MS8 or MS9 chassis, it was a problem with not going small enough on the Sanwa 29E31S with Wei-Ya chassis but I used to modify all the ones I sold.

[tinchen3112]

no, its not a ms9 tube.
it is a real flat toshiba tube from a grundig tv which i try to use with the egret3 wei-ya chassis, couse the 15k picture from the original samsung tube is not good enought for me.
the picture, is really perfect, the only issue is, that the width is not ok, i have 2cm borders left and right in 31 khz. in 15 khz only 5 mm.
must the cap have a lower or higher value to get more width?
i also dont know where the cap c84 is..is it the purple one? i cant find any marking on the pcb.
if my chassis got **** up, it is no disaster, couse i have a spare one.

[grantspain]

ok so you have a width problem not height,i am sure that cap is the one to change but i do not know what value to put in

[Ordyne]

There is no way to tell you the right value cap to fit without testing, you have to measure the HV and make sure you don't go out of range, if you do you're going to cause the CRT to emit too much radiation. Not a clever idea unless you want to steralize yourself!

[cools]

Not a clever idea unless you want to steralize yourself!

Sounds excellent! Bet it's no good for the monitor though?