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Author Topic: Nanao ms9 29su  (Read 396 times)

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dracotom

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Nanao ms9 29su
« on: July 31, 2017, 08:20:29 am »
Hello all,
I come ask a little help if possible.
So, i have a Nanao MS9 chassis and my problem come from the CRT PCB i guess.
when i turn on my monitor i can ear a noise inside the tube and look like on my crt PCB.
If i let it turn some minutes, usually my transistor Q506 die or i have a vertical line on the screen. I searched the problem with all  horizontal component but with any succes...
I serarched too in the power supply area but nothing look like bad.
If anybody have an idea i'm of course interested :)
I find a video on youtube, the guy have exactly the same prob as me, if that can help you...
https://youtu.be/aO5ETnzR5nk?t=274
In advznce thank you!

grantspain

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Re: Nanao ms9 29su
« Reply #1 on: July 31, 2017, 05:13:56 pm »
actually you told us why you have this issue in the video-perhaps you did not realise

the original tube/chassis combo was most likely ms2930,2931,2932 or 2934-these are all 0.198mh hl chassis, the ms9-29 is 0.300mh hl

this is why you have the very wide picture and the nasty noise-they are not compatible

dracotom

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Re: Nanao ms9 29su
« Reply #2 on: July 31, 2017, 05:38:20 pm »
Hello, thanks for your reply!
if i unserstand good it's my tube who is not compatible with the chassis?
i don't have the same tube as the one in the video.
but you right, the tube is not the original for this chassis, it is a Naomi tube with a 29E31S chassis, do you think the problem come from here too?
I though with the same size and plugs was enough to make it work good, i was wrong.
i can have the original tube so i'll make a test.
Do you have a topic with the differents tubes/chassis compatibles?
I read some posts of you, you seem to really good know this MS9 chassis, do you know if it's possible to plug a vga cable on it?
Thanks a lot for your advices, i'll test it quick!
« Last Edit: July 31, 2017, 05:47:54 pm by dracotom »

grantspain

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Re: Nanao ms9 29su
« Reply #3 on: July 31, 2017, 05:54:22 pm »
you would need to read the inductance of the windings of each vertical and horizontal to prove it

es31 were never used on Toshiba tubes, they were used on a tube made by shanghai novel-this tube is 0.300mh but there was a difference on the pinout of the neck-something to do with an extra ground pin I think




princess prin prin

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Re: Nanao ms9 29su
« Reply #4 on: August 01, 2017, 12:53:50 pm »
The Sanwa 29E31S manual (ver. 1.2) reports the Toshiba A68KSM696X as one of the possible tubes besides the Chinese ones.

dracotom

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Re: Nanao ms9 29su
« Reply #5 on: August 02, 2017, 06:06:15 am »
Hello,
i would like to thanks you  grantspain,
you was right, it was my non compatible tube the source of the problem.
i swapped with the original one and it works perfectly fine!
Thanks to share your experience :applaud:
And do you know if i can plug this chassis with a vga cable?
Thanks again for your help!!

grantspain

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Re: Nanao ms9 29su
« Reply #6 on: August 02, 2017, 04:54:36 pm »
the ms9-29 is a manual switching 15k/25k chassis(auto switching if ms9-29A)
to display 31khz vga signal you would need a converter of some kind, I do not have any experience with doing this but I have seen you can achieve this with soft 15k or an arcade vga card-someone else will be able to answer this question

  
 

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