Main Pc Board - Atari CX 5200 Field Service Manual

LEFT fRIGHT DIRECTIONAL DROPOUTS TROUBLESHOOTING
NO TE : Make sure
the
and are mounted should be flush with the bottom cover.
U l U2
CX5200 Field Service M anual
Set oscilloscope
sweep time to
.2 msec/div.
Is the rounded square
wave at pin 5 &: pin 7
of A l a minimum of
4- 5 0 MY? (Maximum
.
2.5Y ) Ball must be
spun at a fast rate.
Does the waveform
have a 5 0/50 duty
cycle? ( M inimum
acceptable duty
cycle: 60 /4-0)
Swapout:
1 )
2 ) A2
3) U 1

main PC Board

is ted
sea
No
Yes
No
Yes
A l
Return to beginning
of Test Sequence
properly in the bottom cover.
7-23
Replace Ul
.
Replace U 1 .
The corners where