Repaired my first monitor!

Finch

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Now I just have to adjust it to actually see something of use.

It's a G07-CB0 in a Gorf cocktail and when I got it the flyback had gone out, the caps were mostly likely dead, the HOT was dead and the fuses blown, to add to that it looked like someone took a blowtorch to the heat sinks and in the meantime blew off the top of the Horizontal width coil.

One Bob Roberts repair kit later and I have neck glow, a lot of scary crackling hissing noises and a picture.....sort of. It looks like its skipping around vertically and stretched to hell sideways and in general, pretty crazy.

So, here's my question, I didn't touch any of the adjustments as I repaired the monitor, so hopefully they are as they were before it blew originally, although the horizontal width coil is new, so I'm sure that's out of wack. What should I be trying first?

Also, at the moment the only thing I have to run on it is a Sega Genesis modded for RGB output through SCART. I made a funky adapter so I can run bare wires to the video plug that normally goes into the video board of Gorf and thus, hook a Genesis up to the monitor. Is it not worth adjusting anything while using the sega, or is it an ok starting point to at least getting a picture.

Second question, how dangerous is it to adjust these monitors while they are turned on/charged. The horizontal width coil in particular really requires getting my hand in there to adjust it, same with the B+ pot. Can I safely touch the little plastic pots on the flyback adjustment and the neckboard? or would massive rubber gloves and a screwdriver be a better choice?
 
Adjusting the flyback knobs bare handed is fine, but make sure to have like a plastic or non-conductive tool in order to adjust the horizontal width coil.
 
Adjusting the flyback knobs bare handed is fine, but make sure to have like a plastic or non-conductive tool in order to adjust the horizontal width coil.

+1 on this. And you can safely make all these adjustments with the monitor on. In fact, you have to, otherwise you won't be able to see what you're doing. The reason you *must* adjust the width coil with a plastic tool is not about the shock hazard at all. It's that if you use a metal tool, it'll screw up the inductance and it'll also get hot... Not to mention that using a metal tool on the brittle ferrite core will crack it.

For the rest of the pots on the G07, I usually just use a little screwdriver, since they're those flat board mount pots without knobs - you can't even grip them with your fingers to turn them.

Any control with a plastic knob you can just adjust with your fingers (flyback knobs, etc). Just watch out on cracked K7000 flybacks, sometimes they bite :D

-Ian
 
Any control with a plastic knob you can just adjust with your fingers (flyback knobs, etc). Just watch out on cracked K7000 flybacks, sometimes they bite

Which is exactly why I recommend a long plastic knob (i.e. a plastic screwdriver) for flyback adjustments. Generally I wil hand adjust any pot on the back of the chassis (except the fly) and use a tool for all on board and the fly pots. Overkill? Probably. But getting bit sucks...
 
I make ALL of my adjustments with plastic tools. Most of the time wearing gloves.

Yes, I'm a weenie.

Let's see some pics of that G07!
 
The gloves might save you from the neckboard voltages, but the HV won't even know you had them on. And even if you went and bought HV protective gloves, it may not protect you because 25Kv will find any pinhole.

For comparison, power linemen work with "just" 7.2Kv or or14Kv and their gloves are tested *daily*. And I'm not sure you could even successfully install a big blue with their gloves on. :)
 
I make ALL of my adjustments with plastic tools. Most of the time wearing gloves.

Yes, I'm a weenie.

Let's see some pics of that G07!

I may have to hunt down some wacky plastic tools. I'm a weenie too. I'll have to find a plastic allen wrench for the width coil, any suggestions on where to get one of these.


I'll post some pics, although right now about all you see if horribly distorted Sonic the Hedgehog.
 
I learned this the hard way a few weeks ago using a metal alan wrench to adjust the Horizontal width coil. My poor burned fingers. 20 seconds and that baby got hot QUICK!

Ive still yet to get a plastic tool to do this. Ive heard Radio Shack has them. Do they have a special name?
 
I make ALL of my adjustments with plastic tools. Most of the time wearing gloves.

Yes, I'm a weenie.

Let's see some pics of that G07!

Weenie!

I make all my adjustments with a finger touching the second anode, a foot in a bucket of water, and doing the adjustments with all metal tools! All with the monitor on! Like a real man! :D

* note: I don't do this.
 
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