Atari Jaguar controller port 1 problem

[Earthshaker87]

Hi guys!
I am an Atari Jaguar fresh owner but I have some issue with this great console.
I got it as faulty, then I replaced U38 and its cap and now turns on.
The problem is the controller mapping of player 1.
For exemple in Kasumi Ninja when I push "down" nothing happen, instead I have to push the button number "9". The same controller on the player 2 port works perfectly.
I have similar problem with other games (but differents buttons).
Do you have any idea how to fix it?
Thank you!

[+madman]

This thread may be helpful in diagnosing your issue: http://atariage.com/forums/topic/272851-jaguar-controller-ports/

[Earthshaker87]

This thread may be helpful in diagnosing your issue: http://atariage.com/forums/topic/272851-jaguar-controller-ports/

Thank you for your reply.

However I had a look on that thread and I already ordered the replacement for U20, U21 and U25.

Which chip the controller port 1 is connected? U20, U21 or U25?

[+Stephen Moss]

Are you certain the controller works fine on the other port?

Is there another game you can try in case the problem is with Kasumi Ninja and not the Jag?

If you can provide more information on the wrong mapping that may help narrow down the problem, for example you say 9 = Down, so does 3, 6, and # perform the other directions?

Looking at the schematic U20, U21 & U25 appear to be shared between both ports so there is no single device that affect just port 0 or port 1

[Earthshaker87]

Are you certain the controller works fine on the other port?

Is there another game you can try in case the problem is with Kasumi Ninja and not the Jag?

If you can provide more information on the wrong mapping that may help narrow down the problem, for example you say 9 = Down, so does 3, 6, and # perform the other directions?

Looking at the schematic U20, U21 & U25 appear to be shared between both ports so there is no single device that affect just port 0 or port 1

Yes, the other port seems fine.

I have another Atari Jaguar, and kasumi ninja works fine there.

In Kasumi Ninja everything seems to work exept down and 9 switched.

I tested the controller with Club Drive (actually I do not have other games) and down works intermittently in the menu screen and something is messed up on the keypad. I realized it when I tried to change the camera view.

The pcb is very clean. Maybe a resistor is dead .. but I really dunno how to check it. Unfortunately the double sided PCB makes me confuse even more >.<

 

Edited October 16, 2018 by Earthshaker87

[+Stephen Moss]

An odd fault, as the controller seem to work fine in the other port it would suggest that the controller is ok. Down & 9 are on the same input line but different rows so if the rows select on that port was wrong I would expect it to affect more than just those buttons, equally if the column was the problem I would expect to also affect more than just the one button.

The fact that they are on the same column would make me look there for the problem, 7 & 8 are also on the column, are they functioning correctly?

 

The Down, 9, 8 , 7 column goes to pin 13 on the controller port so look there for bad solder joints, from there is goes through R102 to pin 4 of U20 and then from pin 16 of U20 to pin 2 of resistor pack RP7, and finally from pin 15 of RP7 to +5V. You might want check the continuity/voltages along that route, for example if the 5V connection to RP7 was not good you could get random results, the voltage on the Jaguars controller port input pins should be pulled high to around +5V, you should be able to measure that on pin 13 that without a controller connected.

Edited October 17, 2018 by Stephen Moss

[Earthshaker87]

An odd fault, as the controller seem to work fine in the other port it would suggest that the controller is ok. Down & 9 are on the same input line but different rows so if the rows select on that port was wrong I would expect it to affect more than just those buttons, equally if the column was the problem I would expect to also affect more than just the one button.

The fact that they are on the same column would make me look there for the problem, 7 & 8 are also on the column, are they functioning correctly?

 

The Down, 9, 8 , 7 column goes to pin 13 on the controller port so look there for bad solder joints, from there is goes through R102 to pin 4 of U20 and then from pin 16 of U20 to pin 2 of resistor pack RP7, and finally from pin 15 of RP7 to +5V. You might want check the continuity/voltages along that route, for example if the 5V connection to RP7 was not good you could get random results, the voltage on the Jaguars controller port input pins should be pulled high to around +5V, you should be able to measure that on pin 13 that without a controller connected.

I will have a look tomorow. Thank you very much for your precious informations.