HP 3490A - Page 194

Replac€ Al3U2
in socker.
Monitor wltage
at
pin
1 of
W8
@nectff whi[6
apply-
ing+and-
10V at
pin
2.
Voltage at
pin
1 should
b€
+
10
V arü- l0
V
re-
spoctiwly-
Monitor
rclbga at W8 @n-
nedor
pin
13
while
apply-
ing
+
.nd
-
10
V
at TPA.
Voltage
d
pin
13 .hould
be+1V
and-l V r6pc-
tiwly.
Chsk BATIO
ilitch
@n-
laqts and wiring,
A13U3
by substi-
r
'e pan.
Als
1 389,10 ard feed-
oh A'l3B13 thru
Figure
7-16. Ratio
Troubleshooting Tree.
't-35
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