Atari CX 5200 Field Service Manual page 72

Color Troubleshooting (cont.)
C l
Is there a . 4v p-p
signal on the base
of Q3?
Yes
Is there a 4v p -p
signal on the collector
of Q3?
Yes
Is there a 3 volt p-p
signal between C9
and R31 ?
Yes
Mistuned R.F. Module
or defective:
1 ) R31
2) RF Module or open
R31 to R.F. Module
P in 4.
Repair
or
Replace
C X 5200 Field Service Manual
No
Defective R28 or open
Trace R28 to Q3 . .
No
Is the signal present
at approximately O V?
Yes
Defective R30
No
Defective C9 or open
C9 to the collector
of Q3.
If you are servicing a unit containing
P C B CA020 1 0 8, chip designators have
been changed from U to A .
4-1 5
No
Defective R29.
*** NO TE ***