JVC Videosphere 3240 Horizontal Issue

[greggburnett]

Hello All,
I have been restoring a JVC Videosphere Model 3240. It has had several issues. Here is whay I have done so far:
- The power supply would drop out, so I have replaced Current Regulator X24 and Regulator Amp X25, as well as the electrolytic caps for the five DC power sources.
- There was no picture or sound, so I used a tuner subber to bypass the tuner. I now have picture and sound, supplied by a DVD player through an RF Modulator.
- The picture was narrow horizontally (vertical appears okay and linear), so per the Sam’s I have replaced X20 Horiz Osc, X21 Horiz Drive, and X22 Horiz Out, as well as the electrolytics and some resistors in those circuits.
- I found a 2017 post in Videokarma (“Findm-Keepm”,Brian) suggesting that I change C401 and C402 to polystyrene/styroflex caps, which I have done.
- I also changed mylar cap C301 in the AGC circuit, also suggested in the Videokarma post.
- At this point, I have a double horizontal image, with a dark band down the center (image attached).
- The horizontal hold has range, and it holds, but I can’t get rid of the double image.

Any help will be very much appreciated.

[zeno]

The dark bar is the hoz blanking pulse. The vert is stretched and maybe rolling.
Start at the hoz AFC & if it is rolling also, look at the sync sep stage.
With ANY old JA solid state B&W they have bad small 'lytics. Even
50 yrs ago recapping the hoz & vert would fix 90% of them. JUST the
electrolytics ! When the hoz is fixed odds are the width will be normal.

GL & keep us posted.
73 Zeno
LFOD !

[greggburnett]

Thank you. Will do!

[damen]

Someone posted a similar problem on a set a while back, turns out they had misread the value of a cap in the AFC/OSC circuit that they replaced.

[greggburnett]

Thank you. I will check my work.