Atari CX 5200 Field Service Manual page 110

4-PORT 5 200 SYMPTOM CHECKLIST (Cont.)
SYMPTOM
Joystick does not work
Keypad does not work
F ire Button does not fire
CX5200 Field Service Manual
CONTROLLER F All.. U RES
POSSIBLE CAUSES
PORT,U5,U7 , C9 l -C l 06,
R l 0 6-Rl 1 3
P ORT,U9-U 1 2
PORT,U5,R1 1 4-R 1 1 7 , C 1 07 -C l l O Pg. 4-20 or 4-2 1
5-2
FLOWCHART
ENTRY POINT
Pg. 6-3
Pg. 6-4
* * * N OTE * * *
I f you are servicmg a unit
con taining PCB CA020 1 08,
chip designators have been
changed from U to A.