help for nanao monitor

[xam29]

hello,
my name is maxime, i'm french and nice to meet you

i've a problem with my arcade monitor
model board : MS7-18A (it is like MS7-20L)
neck board : 519A1
picture tube : mitsubishi

i can't regulate the H-size
and i lost the focus in game

i haven't find the schematics for this board, can you help me please ??

thanks a lot

Xam

[Ken Layton]

Contact the Nanao expert and forum member, JOMAC from Australia. His website is:

www.jomac.net.au/mon.htm

[xam29]

thanks, i've mail jomac
but access to his board cost 50$ per years !!!
if anyone have an idea ....

[grantspain]

have you tried the focus pot on the lopti/flyback transformer,the width problem could be the pot/coil adjusted badly or a transistor,i can't remember which transistor but i will check for on tuesday when the world returns to work-in the mean time try adjusting your focus pot

[xam29]

i've already adjust the focus pot but it unregulate itself
for the h-size coil, i can't adjust it, because it like broken ( it wan't turn)

I wait your result

thanks

[Ken Layton]

thanks, i've mail jomac
but access to his board cost 50$ per years !!!
if anyone have an idea ....

As far as I know he does NOT operate a message board. He does have a link to the Star Tech Journal's message board (not owned or run by him). He visits and posts messages there, but it costs money for ordinary people to access that.

[xam29]

i'm not sure i've understand your reply
he just reply on startech board, that board is not at him and if i want a reply of him, i have to post on startech board
i'm right ?

[Jomac]

Normally these flybacks crack just above the pots , You will need to move the metal surround away from the front of the flyback to see this properly.
If you see a crack it will need to be replaced , Part number is MSH1FPU07 .

If you don't see any cracks the problem is more than likely the CRT socket on the neckboard , these corrode internally and only noticeable if you look where the focus wire connects to the focus pin , it will look slightly green in color.

As for the H-Size there is a single pin jumper that can be moved to adjust the size in steps , it's located beside the flyback in the power supply section. ( The wire is Red ) it can be on N =Narrow , M-Medium or , W=Wide.

[xam29]

thanks jomac
i will look for that as soon as is possible

have you got the manual of this monitor ? can you send me a copy ?

[Jomac]

Sorry I dont have any Nanao manuals or Schematics , the copied versions I have seen from internal sources are very bad quality and were never made public.
There is nothing a manual or schematic could do to help with the problems you are having anyway , so I wouldn't be to worried about it.

[xam29]

i've check my monitor
in fact, the focus is unregulate when i turn on the screen, after it come clear itself (after 5-10 min)
and i've other problem, i've seen little electrical discharge (little flash) on monitor with clac clac (sound) like it turn off and turn on immediately (the picture flash on top of the screen) ....
i think, he is very ill 

[Jomac]

That clicking sound is 100% a crack in the flyback , it is arcing to the metal surround at the front of the flyback  , this is the most common fault with these chassis.
If you leave it like this or try operating for to long it will also damage the Sync hybrid IC

[xam29]

ouch!!
i try to find a flyback ...
thanks for your help