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Author Topic: Scrambled Screen on Cherry Master 8 liner  (Read 6081 times)
Jacell3
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« on: March 05, 2013, 11:35:07 AM »
Hi everyone .... I am having an issue with two of my boards and i believe they are a sigma type boards: Magical Odds and Magical Tonic. When i plug them in all i get is a scrambled screen and when i switch back to my Dyna boards those work with no issues.  Any help on this would greatly be appreciated.
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asgard
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« Reply #1 on: March 10, 2013, 04:05:38 AM »
What exactly do you mean by "scrambled" ? All of those boards edge connectors are wired the same so it is either the monitor sync switches or your power supply voltage. If none of those work then the problem is with the boards.
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Jacell3
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« Reply #2 on: March 12, 2013, 03:18:50 PM »
here is a pic of what it is doing.

* photo.JPG (141.41 KB, 640x478 - viewed 320 times.)
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asgard
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« Reply #3 on: March 14, 2013, 07:53:46 PM »
 Definitely not a monitor problem, it's either the power supply voltage or the boards. Adjust your power supply voltage between 5.0 to 5.9, if that doesn't work the problem is with the boards.
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channelmaniac
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« Reply #4 on: March 17, 2013, 01:08:11 AM »
Quote from: asgard on March 14, 2013, 07:53:46 PM
Definitely not a monitor problem, it's either the power supply voltage or the boards. Adjust your power supply voltage between 5.0 to 5.9, if that doesn't work the problem is with the boards.

OMG NO!

TTL Logic runs from 4.75 to 5.25v. DO NOT run these boards above 5.25v!!!

Is this one of the older boards with the "reset switch" and a NiCd battery next to the big edge connector? If it is, check the switch to make sure it is good because that controls the +5v to the program memory (SRAM the CPU uses) RAM chip. I've seen that on some of the older boards.
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Jacell3
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« Reply #5 on: March 17, 2013, 01:32:54 AM »
i just checked the board and this one does not have the reset switch at all on the the board
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asgard
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« Reply #6 on: March 17, 2013, 02:25:30 AM »
I own and operate over 100 of these types of machines, I have never seen a board get damaged on the 5 volt circuit. OP, I have the two games you are talking about and some of these boards require a little more voltage to boot up. Put a multi-meter on the power supply and slowly adjust the voltage from 5.0 to 5.9 ( I wouldn't operate a machine below 5.0v ) if the board doesn't boot up then you know you have a bad PC board. Also like I said in a different post, if the board isn't in use you should remove the battery because it will leak and damage the prints on the board check yours to see if that happened. Most of my power supplies are between 5.3v and 5.5v.
« Last Edit: March 17, 2013, 02:37:18 AM by asgard » Logged
Jacell3
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« Reply #7 on: March 25, 2013, 04:04:08 PM »
What does that mean when it says check sum bad?
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asgard
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« Reply #8 on: March 25, 2013, 05:23:55 PM »
Could be an error in the processing, reset (memory clear) the board. To do this you have to hold down the percentage switch (while machine is ON)  then switch OFF then ON the machine, release the percentage switch and follow the instructions from there. If that doesn't work you probably have a damaged board. I hope not cause those Magical Tonic boards are hard to find.
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Jacell3
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« Reply #9 on: March 25, 2013, 07:05:40 PM »
I tried that and it went right back to the same mesage so i guess the board is bad..Thanks for the help on trouble shooting it.
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