Following the Big Buck project, here is our part two real quick…

I mentioned in the first installment that the seller of the cab stated the CRT was working and actually even gave me a receipt from a tech who had calibrated the screen a few years back.
The story goes that it’s been sitting in a warehouse ever since, collecting dust.. The problem is, if the CRT is stuffed I don’t want to have to fix it or replace it with another big ass heavy, hard to find CRT Monitor.. So the options are LCD TV or not TV…
So lets take a look at how this beast displays a picture and see if the CRT has some life:


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Left to right, you can see the following-
The CRT in all it’s glory, the video out from the Monitor Chassis and lastly the plug that would have gone to the game PCB at some point.

So, firstly we figure that to make this whole thing easy we’ll use and Jamma harness and an J-PAC adapter. Simply because it’s neat, fast, able to be used with retro PCB’s later and I’ll want some buttons too.
Read more here:

To adapt the old plug to the Jamma video plug is fairly straight forward, most PCB’s just accept a Jamma harness, but this had a Horizontal and Vertical sync aswell.
In an Arcade Cabinet, video signals goes from the arcade system board (PCB) to the monitor through a harness. This harness is commonly made of 5 colored wires:

Red wire: red signal (rgb)
Green Wire: green signal (rgb)
Blue wire: blue signal (rgb)
Black wire: ground
White wire: horizontal synchronization (H)

The way around this is to simply wire the horizontal and vertical sync to the one wire.
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So in the first picture you can see the old plug connected (the top part of the plug is going to the Chassis) this is the plug we cut off and joined to our Jamma harness, second picture you can see the connector I’ve used to make it easy, also note the two sync wires and joined.
Lastly we plug the Jamma harness into the JPAC and give her some power..
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First we connect the Chassis to the power supply and make sure that everything is in order, the stepdown looks nice and clear, no power cables are going to short out, plugs all secure, fuse looks good..etc
Now before powering up the machine, lets set up the JPAC with some power via PS2 connection (powered by laptop not pictured).
I’ve also connected a VGA cable for testing, I’m not actually sending any signal, just interested to see if the CRT powers up, which it dones!.


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Success… well kinda. Wasn’t able to get a good output to run into the JPAC, I only have a laptop on hand that has an onboard graphics card that didn’t want to play nice.
If this did go well, this would be where I run Soft-15khz software application, this would output my video at the correct 15khz and avoid damaging the monitor.
Since this wasn’t working and I didn’t want to have trouble configuring it in future, I have planned to go ahead and just purchase an ArcadeVGA graphics card for the final build.
For now, I’m happy knowing the monitor has some life, we’ll re-visit the screen in future.