Atari CX 5200 Field Service Manual page 94

SNOWY SCREEN (POWER SUPPLY) TROUBLESHOOTING
Is LED on?
No
Is there 5VDC
on the output of
VR2 or pin 3 of
the R.F. m odulator?
N o
Is there at least +7VD C
on the inpu t of VR2?
N o
I s the base o f Q7
O.7-1 .0VDC less
than the emitter?
No
Is the collector of
Q8 at 0 volts?
No
1 ' 1
C X5200 Field Service Manual
Yes
J
Yes Defective LED or
open from LED to
VR2.
Yes
Defective V R2 or
shorted output VR2.
Yes
Defectiv e Q7.
Yes
Defective R58 or a
broken trace to Q7.
4 A- I O
Repla ce or
Repair