U5000 b+

zork40

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Hey,

I've been struggling with a WG U5000 monitor, and finally got it working for the most part. Someone used it for parts, and cut out a bunch of transistors, diodes, resistors, caps, etc... I put them all in, replaced a bad resistor, and finally got it working.

I've read that the B+ for most monitors should be set to 130v. Why is it that on this monitor, it specifically lists the B+ at 155 when running at medium res of 25khz?

U5000_b_plus.jpg

Is the manual wrong?

I have a vertical deflection issue, where the monitor occasionally shrinks vertically a few inches and then expands back to full size. I'd like to get the B+ right before trying to fix that. Does anyone know what would cause that shrinkage? I have the troubleshooting guide from WG and I plan on checking the components they list as causing problems with vert. deflection.
 
IIRC you are correct on the B+, it get's that from a seperate power supply. I think on some there were two different B+ voltages. But the 155v sounds right for the U5000 is this a 33" or 27" I'm assuming that the bigger the monitor, the higher the b+ could be wrong on that. But I set them for what the manuals call for.

As for the shrinkage, I'm not sure, but it does sounds like you are describing verticle colapse.

Have you done a cap kit yet?
 
Thanks for the info. I replaced all the caps, except for 2 - the big filter cap, and another oddball one that was very tall. I did check both of those out of circuit with my cap. meter and they seemed OK. I just turned it on and ran it for 20 mins or so and it didn't shrink once. I'll have to keep an eye on it and see what it does long term.
 
First off, I don't know that 130v is the standard B+ for MOST monitors. The G07 has a B+ of 120, then 20EZ has a B+ of 108, and I recently had a monitor with a preferred B+ of 98.

Second, dual-res monitors sometimes have a higher b+ for the med-res than the standard-res.

As for the shrinking pic, I'd look over everything for some cold solder joints.

The troubleshooting guide is okay for giving you components to check, but this may be of more help:

http://www.wellsgardner.com/pdf/Service/U5000.pdf
 
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