California Speed causing Monitor Problem

eabundy

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Vernon, Connecticut
When I got the machine the both monitors were dead. (I have 2 california speeds linked). I bought 2 new Tri Mode monitors from HAPP. Installed them both. One has a perfect picture the other is missing red. I pull the cable from the nice picture board and ran the monitor off the 2nd PCB and have a perfect picture. Fast forward a few weeks later and now when I power up the machine the monitor blinks on and off and is missing red. I found if I press on the jamma connector at the cpu board the screen no longer turns on and off, but the red is still missing.

I'm guess the cpu board has a bad solder joint / crack? Not being very familiar with arcade boards what should I check as I'm fairly certain its an issue on the cpu board itself. Also just to double check I through a 60-1 in that game and the picture came up perfect with the same jamma harness that should be connected to the california speed cpu.

I am tempted to just buy a new CPU and be done with it, but alas they are not readily available, and it seems like it could be an easy fix.
 
Last edited:
Might want to check the JAMMA harness and connectors, specifically the video outputs. Maybe the connector isn't making good contact on the red video output. Did you try cleaning the edge connector on the PCB?
 
id also make sure the pins in the jamma connector are making good contact.

After that i would ohm the red video wire between the jamma connector and the monitor connector to make sure there is not an open someplace.

After that id check the video connectors of both monitors to make sure they are pinned out the same.

If after all that checks good, i would suspect a pcb issue. Swapping pcbs will verify this.
 
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