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Clarification on dangerous areas of CRT's

Xplicit

Xplicit

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Hi guys, New member here. I have recently started to help out a local Arcade, by repairing some of the machines. I have a question about the CRT's.

I understand the process of discharging the CRT, However I'd like to know in a little more detail, what parts are dangerous.

I see some repair videos where the repair tech is non-chalant about adjusting the colors / pots on the neckboard while the monitor is on.

My questions are, which parts can zap you? Are you able to safely touch the metal chassis while adjusting the pots on the neckboard? Can the neckboard pots be touched bare handed without getting zapped? Some of the pots are really small and are difficult to reach even with a screw driver, without taking the top of the cabinet off. I'm always really nervous adjusting the pots. Lol.

Most boards I've seen here are the K7000, K7500

Thank you!
 
I am a hobbyist at best but I do all my own CRT work. I recommend we wait for someone with more experience to answer your question more thoroughly. I did want to share that anytime you're adjusting pots it's best to use a trimpot tool. https://www.thingiverse.com/thing:6111567 <- that's one I made to get into tight areas but you can find plenty on Amazon, too. Just make sure they're non-conductive. Some people also use thicker zip-ties. I don't love doing that because of the elasticity the zip-ties have. They can be hard to use for precise adjustments.

Some tips I try to remember:
- whenever you're working on a CRT (especially when on), be sure to keep one hand in your pocket.
- Discharge the tube every time it's been sitting for more than a few minutes. It will recharge while off (especially in dry environments)

To note: the neckboard definitely can zap you since there's current running through all of the traces. The Nanao monitors usually have a little piece of insulating plastic to guard the solder-side; not sure about WGs.
 
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