Atari CX - Page 146

LEFT/RIGHT DIRECTIONAL DROPOUTS TROUBLESHOOTING
k
J
Set oscilloscope
sweep time to
.2 msecldiv.
J b
Isthe rounded square (
I
wave at pin 5 & pin 7
of A1 a minimum of
450 MV? (Maximum
INo 0 Replace U1.
Does the waveform
have
a 50150 duty
cycle? (Minimum
acceptable duty
cycle: 60/40)
*
1 spun at a fast rate. I
Replace U1.
*
Swapout:
I 1) A1
Return to beginning
of Test Sequence
NOTE ~Wke sure the main PC Board is seated properly in the bottom cover. The corners where
U1 and U2 are mounted should be flush with the bottom cover.
CX5200 Field Service Manual