Atari CX - Page 90

SNOWY SCREEN (POWER SUPPLY) TROUBLESHOOTING
b
Is LED on?
+
No
h
Is there 5VDC
on the output of
VR2 or
pin 3 of
the
R.F. modulator?
( No
b
Is there at least +7VDC
on the input of VRZ?
+
L
Is the base of 47
0.7-1 .OVDC less
than the emitter?
CX5200 Field Service [Manual
Yes
I
L
1
J b
I
1
Defective LED or
open
from LED to
VR2.
#
Yes
/' D
No
Is the collector of
Q8 at 0 volts?
I
w
I
I
I
Defective VR2 or
shorted output
VR2.
r
L
I
Yes
r I
I
I
J
Defective 47.
Yes q
Replace or
Repair
+
7
Defective R58 or a
broken trace to 47.
& A
* L
No