arcade troubleshooting

jcterzin

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Hey all.

Im still working on my Out Run unit and have successfullly installed a new power supply, replaced a busted off cap, and generally have gotten a feel for the thing. The next issue is this. The pcb lights up when powered on, and the speakers begin to make sound (basically static) but I get nothing on the monitor. I checked and it says the monitor was manufactured in 1999 so it has been replaced. My question is what should my next move be? Should I try to test the pcb, and if so how do I go about doing that? or should I do something else?
 
whoa, guys I just held down the test button and the game came to life! It appears that the PCB is working in good order now. However, I am playing blind. Like I said before, the monitor is relatively new (manufactured in 1999 it says). What is the most common problem when this is the case?
 
it appears to be a Wells Gardner 7300 or 7302

the chassis has the number WG 1493788

and the back of the monitor has a sticker that says samsung type #A48KRD82X02
 
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If the sound is working, that is a very good sign but you cannot really do much to test the video from the PCB without a working arcade monitor.

There are a few basic things you can do first:

1. Check the connections. There should be two, one for AC and the other for the video signal from the PCB. Sometimes the video signal is divided into two adjacent connectors and other times there is just one.
2. Check the fuses in the bottom of the cab and any that might be on the monitor chassis.
3. Check the AC Voltage line and make sure it is between 110v and 130v.
 
The AC line going to the monitor board is getting 110v. Also the fuses look fine. The monitor neck isnt glowing I just noticed. The Flyback transformer perchance? How do I test it?
 
I have been looking for someone near me to hire to look over the monitor because I really have no experience with them at all. HRMMMMMM, so frustrating. The board looks brand new! Why are these not just like computer monitors, where you just plug them in with a power and VGA cable?. Should I just say to hell with it and find a replacement?
 
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Have you tried the stuff mentioned on the other posts?

I looked at the following from Ken's page:
Common problems: Power applied, Monitor dead, No neck glow.
Cause: Resistor R812, Transistor Q801, and Capacitor C807 are all bad and should be all replaced.
Solution: Replace R812 (68 ohms, 1/2 watt), Q801 (2SC2073 or 2SD478 or NTE 375), and C807 (100 uf @ 16 volts).

Not that Ken needs any backup on this, especially from a novice like me, but I bought a non-working K7302 a couple of years back and R812 was gone. I guess the guy I bought it from realized that was the problem but never replaced it. As soon as I did, it started working again. I would suggest that you try replacing all three of the components that Ken named and you may get lucky. In fact, now that I have that info I will probably order Q801 to have on hand for the future - Ken is a genius when it comes to monitors.

If Ken's suggestions do not work, you could try to track down another chassis. I would try to find one of the same model, there is a chance another might work with that yoke/tube but I am not exactly sure for the K7302. You could also send it in for repair if you cannot find anyone local. I know Chad at ArcadeCup.com is a member here.
 
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