WG6100 Warped Picture

Cavern Arcader

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Hi All,

I have yet another issue with my WG6100, after I completed a Rebuild kit on the AR/II and replacing the Big Blue my screen now looks warped on the top and bottom of the screen... I've checked the voltages on the PCB which are at 5.1V and the power to the monitor all looks good. Also tried swapping the chassie transistors with no changes.... \

looking for suggestions.... thanks in advance.
 
Bad 1495, most likely the one at AB12.

There are two pairs of 1495's, two which provide amplification, and two which provide correction, to adjust for the pincushion effect of the tube. If you look at the schematics, you'll see two 1495's that cross the axes, one taking some of the x signal and feeding it to the y, and vice versa. These are the pincushion correction amplifiers.

On yours, the one that reads off of the x axis, and corrects the y axis is bad, so there's no correction, and you're seeing the pincushioning. This is the one at AB12
 
Probably AB12.

You can get the 1495's on ebay. Mostly from China, so it might take a bit, but you may be able to find a US-based seller.

:D
 
Disabling the magnetic plasma flow to the nacelles would be the best way to keep it from warping.
 
You can get the 1495's on ebay. Mostly from China, so it might take a bit, but you may be able to find a US-based seller.

Probably AB12.

You can get the 1495's on ebay. Mostly from China, so it might take a bit, but you may be able to find a US-based seller.

:D

Maybe.

Do yourself, and the PCB, a favor ... and socket them. :cool:


Everything these guys said. And keep a few on hand just to feel safe.
 
Pin Cushion Fixed

Problem Solved!

Thanks for the information as it was The MC1495's; however, not the A/B12 or the A/B13 but rather one of the C12 or C13.

I replaced the A/B12 first then the A/B13 and still had the same issue, so I decided I wasn't going to leave one old chip in the board set so I decided to replace C12 and C13 at the same time and the picture looks great!

Took about a month for the chips to arrive but I had to make sure I closed off the thread when the problem was solved as I hate reading a thread that just ends!
 

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It would have been C13 in that case. It wasn't the amp that provides the correction signal, it was the one that actually applies it, which would have been the next choice. It's good to have them all socketed anyway, as it will make troubleshooting them very easy, when they go again in 10-20 years. (The next repair guy will thank you.)

Either way, glad your board is working. Enjoy some Tempest!
 
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