19v1002 - wave across the screen and not centered

Bullwinkle

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I'm working on my Super Breakout. Judging from Ian's sticky, I should look at the B+ and if that's good, maybe replace the filter cap. (I have already recapped the monitor but have yet to put a new filter cap on).

Question I have is, where is the B+ test point, what should it be and where is it adjusted? I cant find a schematic specific to a v1002 (I see ones labeled 1000 and 1003) ... this is my first attempt at measuring and adjusting a b+, so any help is greatly appreciated.

the attached pic show the off-centered screen. the video shows the wave.

thanks

-tom

 

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The B+ on that monitor should be 75 volts. The adjustment is a pot laying flat on the chassis, on the corner of the circuit board closest to the large silver can capacitor.

The test point is marked #2, according to the manual. I forget exactly where it is.

This monitor uses a multi-section B+ filter cap - it's that silver can. It actually contains four capacitors in one, and can be replaced with four separate capacitors. Just tie all the cap's negative leads together. According to the manual, the sections are:
800uf@125v
200uf@100v
200uf@50v
20uf@200v
These old values are not commonly seen any more. Replacements can safely use slightly larger capacitance values. So you can substitute 820uf for 800uf, 220uf for 200uf, and 22uf for 20uf.

-Ian
 
Ian, thanks so much not only for this reply, but the info in the sticky thread. I think I'm on the right track now. I'll check the voltages and see what I get.

Is this the same manual as the 1000 & 1003?
 
OK...tested what I believe is the B+ (see photo)

monitor chassis.jpg

I'm was originally getting 88vdc. I turned it down but the lowest it will go is 85.24vdc. I'm assuming that I need to move on to my filter cap. Other voltages listed in the manual for the 1001 show:

testpoint - proper value per manual : actual value via DMM

2 - 75vdc : 85vdc
3 - 155vdc : 168vdc
28 - 550vdc : 612vdc
7 - 28vdc : 33vdc

Will pick up proper caps and replace.

Thanks,

-tom
 
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Ian, I'm assuming that the voltage (as long as it's higher) is not an issue on any of the 4 caps that make up the multi-section filter cap (ie: i can get an 820uF cap, but at 200v instead of the listed 125v). About to order from Mouser but want to make sure where these will be tied together with other caps..that the normal cap voltage rules still apply.

Thanks,

-tom
 
Yeah, as long as the voltage is the same or higher, you're good.

The negative leads of all the caps get tied together.

Look at the original can capacitor. On the bottom it'll have four terminals, and soldered lugs connected to the metal can itself. The terminals will be labeled with little shapes - a half-circle, square, triangle, etc. The side of the can will list the caps in the can, and their associated shape. These listed terminals are the positive side of those caps. The outer metal canister is negative for all caps.

-Ian
 
Yeah, as long as the voltage is the same or higher, you're good.

The negative leads of all the caps get tied together.

Look at the original can capacitor. On the bottom it'll have four terminals, and soldered lugs connected to the metal can itself. The terminals will be labeled with little shapes - a half-circle, square, triangle, etc. The side of the can will list the caps in the can, and their associated shape. These listed terminals are the positive side of those caps. The outer metal canister is negative for all caps.

-Ian

Finally getting around to this... I'm assuming I will just tie the negatives together and solder them into where the canister lugs went? ... i'm looking at this.. and it's lookin like a real chore ;)

What's the best way to organize this? I can see some serious potential for shorts with all the stuff connected underneath

breakout_monitor.jpg
EDIT: Finished replacing the canister cap with the 4 individual caps... no difference..still getting the "wave" effect across the screen. Would big blue cause this? I still cant dial down the power at B+.... still up around 86vdc (should be 75)


thanks

-tom
 
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I have Bullwinkle's Breakout now and fixed the B+ issue. It was the voltage regulator! :) I replaced that and was able to adjust the B+ to 75V. The wave is gone.

Tom did a good job on this monitor, I am glad he replaced that big silver cap with that series of caps and not me! That looked like a major pain!

I need help adjusting the picture. I can't get the picture down far enough to line-up with the blue line for the paddle. If I move it too far down the left side curls. What is the horizontal oscillator adjustment for? Is that horizontal width? I need to find a horizontal center adjustment (to the bring the picture down on the vertical monitor) and I don't see one. Anyone know?
 
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