I have this Hantarex Polo/2. Adjusting the width coil seems to have no effect. The image stays too wide no matter what I fiddle with. Is this something that would require e to swap film caps to get it dialed in? Anyone know which caps are responsible and what value to change them to to reduce width?
Hantarex Polo/2 width issues
- Thread starter Esom
- Start date
No effect at all? Check the solder joints of the potenciometer board with main chassis pcb, they tend to get cold/break,. Also check the potentiometer itself.
If not you'll probably have to check the entire path from the potentiometer to the horizontal deflection IC for faulty components.
Here you have a cap map: https://forums.arcade-museum.com/threads/hantarex-polo-cap-maps-by-request.164549/
If not you'll probably have to check the entire path from the potentiometer to the horizontal deflection IC for faulty components.
Here you have a cap map: https://forums.arcade-museum.com/threads/hantarex-polo-cap-maps-by-request.164549/
Thanks, but that appears to be a cap map for the Polo, not the Polo/2.
Also, the horizontal width coil seems to have no effect. The H.Amp pot on the remote board does change the width, but only at full/nothing positions, and the difference is like 5 pixels.
Also, the horizontal width coil seems to have no effect. The H.Amp pot on the remote board does change the width, but only at full/nothing positions, and the difference is like 5 pixels.
Ohhh, progress? So when I was recapping, one cap didnt appear on my list, so I marked it for replacement later and moved on. In my quest to inspect every single component in the horizontal circuit I stumbled upon it again. Lo and behold, it's not supposed to be an electrolytic cap! On the schematic it's listed as "C87 - 220n" but no voltage ratings is mentioned and I can't find a full parts list for this chassis.
So, what should I replace this with? I assume the square footprint on the silkscreen should roughly match the size of the cap, should that indicate the correct voltage?
So, what should I replace this with? I assume the square footprint on the silkscreen should roughly match the size of the cap, should that indicate the correct voltage?
Attachments
Found a short in T19, replaced it and the pincushion was gone and the h-amp pot was responding again! ...for 10 whole minutes. I still couldn't get the width down enough to fit the screen, and then the image went all wibbly-wobbly, and them boom, back to exactly where it was before. Shorted transistor and all.
So, what burns up transistors like that?
So, what burns up transistors like that?