Missile Command monitor wavering slightly

mhkohne

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I've finally gotten my cocktail Missile Command into the house and started actually playing a little.

Right now, the monitor is wavering a little (the image is also too small, and the brightness is cranked way up, but that's just adjustments). Research on-net tells me that I should put a cap-kit on this thing, as well as change out the big blue capacitor (According to Bob Roberts, a bad big blue can cause monitor issues). THEN I can try adjusting the picture.

Swapping the big blue is no big deal, but I've never done any monitor work before. Does the cap-kit do anything to the neck board, or is it all on the chassis board?

I've got a second MC cocktail table, with no logic boards, and a broken necked monitor. Should I re-work that chassis and swap it into the good monitor (they are the same type of monitor)? Or should I cap the chassis from the good monitor because I know it started out functional?

Is there anything else I should be doing? Anything else I should be changing out that I just don't know about yet? I want to minimize the number of orders I have to make for parts.

Thanks!
 
You should start by doing the cap kit. Once you do a cap kit you will be able to better analyze if the monitor needs anything else. Add some pics and the type of monitor you have. This will help with an suggestions, such as replacing the flyback at the same time. If you haven't done a cap kit yet, just take your time and do one at a time. Remember to observe the direction of the cap, monitors can have wrong markings on the pcb. Most cap kits do have a few caps for the neck board and most cap kits don't have the large filter caps either. Good Luck.
 
Thanks. It's the Sanyo 14" (http://pdf.textfiles.com/manuals/AR...7 1st Printing) [Op-Maint-Serv] [English].pdf).

What are the signs for needing a new flyback? Given that this beast is 30 years old, is it likely that the flyback is going to go?

Filter caps: Assuming these are on the chassis/neck boards, are they not included due to expense or because they don't tend to degrade much? Is there somewhere I can buy the kit that's more likely to have them? I have some caps here, and I can always order others from digi-key or something, but I'd like to get the full set in one go.

Thanks!
 
Some examples of a bad flyback are: Dark picture that can't be adjust. No pic with a "clicking" sound. Sparks coming from flyback. Ooze coming out of the flyback and hairline cracks.

Most cap kits do not come with filter caps, due to price. You will get mixed opinions on what needs to be changed in capping a monitor. I have not capped a Sanyo 14" and don't have a list of caps that usually get changed. I would order a cap kit and go from there. Cap kits have the caps that fail the most and cause most of the problems. You could also can make a list of all the caps and place an order with Mouser or etc.

Some monitors have badly designed flybacks and go out more than others. Some monitors have very good flybacks and usually don't need to be replaced and they maybe impossible to get. I'm not sure of the reputation regarding the Sanyo 14", but with the checking I did on the internet, I could not find any available. So that might mean that they were reliable.
 
Some examples of a bad flyback are: Dark picture that can't be adjust. No pic with a "clicking" sound. Sparks coming from flyback. Ooze coming out of the flyback and hairline cracks.

Most cap kits do not come with filter caps, due to price. You will get mixed opinions on what needs to be changed in capping a monitor. I have not capped a Sanyo 14" and don't have a list of caps that usually get changed. I would order a cap kit and go from there. Cap kits have the caps that fail the most and cause most of the problems. You could also can make a list of all the caps and place an order with Mouser or etc.

Some monitors have badly designed flybacks and go out more than others. Some monitors have very good flybacks and usually don't need to be replaced and they maybe impossible to get. I'm not sure of the reputation regarding the Sanyo 14", but with the checking I did on the internet, I could not find any available. So that might mean that they were reliable.

Thanks. I'm going with those assumptions and ordering the kit from Bob Roberts (I also noted that he didn't have flybacks for this monitor available). I'll also get the big blue (cabinet PS filter cap) and then see where I stand.

Thanks!
 
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