Atari CX 5200 Field Service Manual page 151

SYMPTOM
Noisy operation or ball
won't spin freely
Keyboard failure
F ire button failure
Cur sor won't move at all
Cur sor moves erratically left
and right or up and down
Cursor won't move left
or right
Cursor won't move up
o r down
D irectional dropouts
(left or r ight)
D irectional dropouts
(up or down)
B lank screen when
trakball is plugged in
CX5200 Field Service Manual
SYMPTOM CHECKLIST
POSSmLE CAUSES
Dirty roller and idler
shafts and ball, worn
bearings, warped encoding
wheels
Dirty keyboard PC board,
dirty 1 2-key switch set,
or defective game cable
Damaged dome switches on
keyboard PC Board, defective
game cable
Q l , A3, defective game
cable
A3
U l , A I -A5, C7
U2, A I -A5, C8
U l , PC board not seated
properly
U2, PC board not seated
properly
C 1 ,C2 or any of the
IC's A I -A 5 shorted to ground
7 -26
FLOWCHART
ENTRY POINT
A , Page 7-1 1
B, Page 7-1 2
See Chart,
F lowchart B ,
P age 7 - 1 2
No F lowchart
Entr y Point
No F lowchart
E ntry Point
C, Page 7-1 4
D, P age 7 - 1 9
E, Page 7 -2 3
E, Page 7-23
N o F lowchart
Entry Point