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Author Topic: Re: Monitors-Cherry master  (Read 5905 times)
Frank A
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Pinball & Sailing
« on: November 16, 2009, 07:17:25 PM »
I have a Cherry Master with monitor issues. Some times when I turn it on it just stays green or has lines running thru it and sometimes it works fine. Is it the monitor or is there some electronic gizmo that has blown that is the issue ? I am afraid to open up the back and start tinkering since I read that the tubes discharge high voltage if the wrong thing is touched. Help please !

Frank A
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Frank A
Frank A
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Pinball & Sailing
« Reply #1 on: November 19, 2009, 06:46:28 PM »
I have added 2 pictures. Does anyone have any ideas as to what the issue may be ? Thanks, 
Frank A

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Frank A
channelmaniac
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Few things are better than fixing an old game...


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« Reply #2 on: November 21, 2009, 09:10:30 PM »
That looks like a bad clock driver or crystal.

That's what a Neo Geo board looks like when the crystal is bad or the 74LS368 IC that drives it has gone south.
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KirkLasVegas
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« Reply #3 on: November 21, 2009, 09:17:06 PM »
Quote from: Frank A on November 19, 2009, 06:46:28 PM
I have added 2 pictures. Does anyone have any ideas as to what the issue may be ? Thanks, 
Frank A

Frank...
It looks like the monitor is working and has good sync. I suspect it's displaying what it is being sent. Check grounds loose or open. Check power supply rails (12=11.8 to 12.5 and 5=4.75 to 5.20).
If all that looks good, look at the video source....


Kirk
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Definition of "Retirement"= to be able to get back all you contributed into it AND take some of their money too before dropping dead.
Frank A
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Pinball & Sailing
« Reply #4 on: November 21, 2009, 11:02:00 PM »
Thank you for the help. Attached is another picture. Where do I look for the referenced areas in the game ? Are they in the cabinet or up near the monitor ?
Frank A

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Frank A
Randy0777
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« Reply #5 on: December 29, 2009, 02:37:47 AM »
If you look at the contacts on your board(your PCB board),you will see how the "copper" is faded on some of your contacts. As you have the display up,pull the harness connection back and forth some and you should see a difference. You can try to clean the contacts with a pencil eraser.
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