Fitz
Headphoneus Supremus
- Joined
- Nov 12, 2005
- Posts
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- 19
Quote:
I'm not advising the OP one way or another whether he should do it (and he's already decided not to), but the focus adjustment is the one thing on the monitor that can be safely adjusted with no service manual or test equipment, as long as general precautions are taken while the monitor is open. They're safe to adjust their full range, and have their access limited to a path that keeps you from poking into the other parts, which can be made even safer with a 25 cent plastic screwdriver made especially for trimpot adjustments.
It's not like we're talking about adjusting the magnets on the neck of the tube to fix convergence, or adjusting questionably labeled trimpots elsewhere on the board to fix the colours, where you would need a service manual to do properly.
To the OP: Since you're not going to attempt it yourself (which is a smart move if you aren't confident in being able to safely work inside the monitor), you can try talking to somebody at a repair shop to see if they can just adjust it real quick at little cost, since the problem is already identified and it's a quick fix. It would take them maybe 10 minutes total to adjust it (and probably sharper than it was before), including taking apart and putting back together the monitor. I wouldn't spend anywhere close to $100 on a new CRT unless it was worlds better than the one you already have though, since that's more than I've paid to have the power supply and some other misc components repaired on a very old and very expensive monitor at work (I almost never work on PSUs myself).
| Originally Posted by helix that picture you put up is of the flyback transformer, it should not be adjusted unless you have a service manual and the test equipment to do it right, 40,000 volts and up is not something to be played with! edit: one more thing even though the high voltage caps have resistors across them to discharge to save money the makers keep them at a high value so they can use lower wattage resitors, this means even if some time go's by the caps might still be charged, it's not unusual for them to be ~350v or more, on the bigger ones shorting them out with a screwdriver can fuse the screwdriver to the leads (think arc welder) and if you touch it, it can leave burn marks not to metion severe pain. |
I'm not advising the OP one way or another whether he should do it (and he's already decided not to), but the focus adjustment is the one thing on the monitor that can be safely adjusted with no service manual or test equipment, as long as general precautions are taken while the monitor is open. They're safe to adjust their full range, and have their access limited to a path that keeps you from poking into the other parts, which can be made even safer with a 25 cent plastic screwdriver made especially for trimpot adjustments.
It's not like we're talking about adjusting the magnets on the neck of the tube to fix convergence, or adjusting questionably labeled trimpots elsewhere on the board to fix the colours, where you would need a service manual to do properly.
To the OP: Since you're not going to attempt it yourself (which is a smart move if you aren't confident in being able to safely work inside the monitor), you can try talking to somebody at a repair shop to see if they can just adjust it real quick at little cost, since the problem is already identified and it's a quick fix. It would take them maybe 10 minutes total to adjust it (and probably sharper than it was before), including taking apart and putting back together the monitor. I wouldn't spend anywhere close to $100 on a new CRT unless it was worlds better than the one you already have though, since that's more than I've paid to have the power supply and some other misc components repaired on a very old and very expensive monitor at work (I almost never work on PSUs myself).
![]|[ GorE](https://cdn.head-fi.org/avatars/m/10/10421.jpg?1376682382){kind=avatar}
