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Pincushion problem with wells monitor
mamerocks87:
I just emailed the Wells Technician support, so maybe I should here something soon. I will post what they send me when I get it.
-Kyle
mamerocks87:
Heres the response from wells:
HI KYLE
YOU'R MONITOR FROM THE PIX YOU SENT ME LOOKS ALMOST LIKE A 60 CYCLE HUM. BUT YOU CAN TRY ADJUSTING THE PIN CUSHION WITH THE CONTROL ON THE PIN CUSHION BOARD, WHICH IS MOUNTED ON THE MAIN BOARD.GIVE IT A TRY TO SEE IF THEIR IS ANY RESPONSE FROM THE PIN CUSHION ADJUSTMENT.
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Sorry im such a newbie but which board is the main, and where would i find the pincushion adjustment?
-Kyle
Ken Layton:
Since I don't have a 7400 manual or a 7400 monitor in front of me I can't do you much good.
In general, Wells-Gardner uses optional small plug-in boards for optional things like a pincushion correction circuit. Look on the monitors main (largest) circuit board. There is probably a small circuit board plugged into it (and standing vertically). I'm thinking that would be your pincushion correction board. I strongly advise ordering a k7400 service manual from the parts dept at Wlls-Gardner.
mamerocks87:
I found the pincushion adjustment. It helped some, i guess, there is still noticable boeing. Here are the pics after adjusted..... Could my pincushion control thing, be needing replaceing? What about the 60 cycle hum, he was talking about?? Whats that??
www.debutvm.com/pic1.jpg
www.debutvm.com/pic2.jpg
www.debutvm.com/pic3.jpg
Thanks,
-Kyle
Ken Layton:
I think he meant there's a slight hum bar in the picture (probably caused by some failing caps in the monitor power supply).
This may be an instance where a capacitor ESR meter would be handy to check the capacitors in this monitor.
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