2 port 5200 acts messed up with Trak-Ball?

[SINGLE TOOTH]

So I made a previous post here, but nobody chimed in and I found out more information which might deserve a different thread since I can't edit the title.

 

old thread

http://atariage.com/forums/topic/277333-cx53-trak-ball-issues-jittery/

 

So I thought I had a Trak-Ball issue where it was jittery. I had changed just about everything in it; the dome buttons, all of the IC's, bearings, etc. Nothing seemed to help with it being jittery.

 

I just got a NIB trak-ball from Venezuela. I plugged it in and nothing would move the cursor. I then swapped out IC A1 (LM339) and then I could get the cursor moving, but it was still jittery. I swapped out the rest of the IC's and still jittery even on the NIB one. I then thought this was too much of a coincidence and decided to dig out an old 4 port 5200 and hooked up the RF. I would have done this sooner, but I didn't think this was the cause and it's a pain. My other 2 port i had been using has really nice video with the S-video mod I put in. When I put the NIB trak-ball hooked up to the 4 port 5200 it works fine. The issue must be with the 2 port 5200.

 

Anyway, what could be causing this issue with my 2 port 5200? Is there some kind of IC that is responsible for this?

[SignGuy81]

 

Anyway, what could be causing this issue with my 2 port 5200? Is there some kind of IC that is responsible for this?

 

Do you have the same issue with a regular controller with it being jittery on the 5200?

 

If not then I would think the problem isn't in the 5200 as far as it taking the input, but still may be problem with the 5200 as far as sending power to the chips in the trackball unit. Can you check and verify voltage? Check from pin 1(gnd) and pin 2(+5V) of J2 for 5V. The schematic is here http://www.atarihq.com/danb/images/52TB_PCB1_schem.pdf found here http://www.atarihq.com/danb/52trakball.shtml with other useful info.

 

That is the first thing I would check. To me if it works in the 4 port you would think the trackball is okay but if with regular controllers the analog sticks work fine on the 2 port but the trackball doesn't the only thing I could think of would be a power issue going to the trackball not enough voltage for the chips or something.

 

EDIT:

 

Almost forgot make sure to check it while J2 is plugged in as well.

Edited April 13, 2018 by SignGuy81

[SINGLE TOOTH]

Do you have the same issue with a regular controller with it being jittery on the 5200?

 

If not then I would think the problem isn't in the 5200 as far as it taking the input, but still may be problem with the 5200 as far as sending power to the chips in the trackball unit. Can you check and verify voltage? Check from pin 1(gnd) and pin 2(+5V) of J2 for 5V. The schematic is here http://www.atarihq.com/danb/images/52TB_PCB1_schem.pdf found here http://www.atarihq.com/danb/52trakball.shtml with other useful info.

 

That is the first thing I would check. To me if it works in the 4 port you would think the trackball is okay but if with regular controllers the analog sticks work fine on the 2 port but the trackball doesn't the only thing I could think of would be a power issue going to the trackball not enough voltage for the chips or something.

 

EDIT:

 

Almost forgot make sure to check it while J2 is plugged in as well.

Yeah normal controllers work fine, that’s what’s so odd. Didn’t notice anything odd until using the trak ball