HP 3490A - Page 168

Replace
AI U'16 wirh
known
good
Frt.
Switch
cnges
and lunctions,
ob-
servang decimal
poinl.
Should correspond
to
Enge.
Return
to
General Trouble-
shooting Tree,
Figure
7-4.
SEE NOTE
1. Monitor
Din
SEE
NOTE
1. M@sure
rcttage
ar
pin
2 ot
A'U12.
Should
b€ <
+
0.5 V.
SEE NOTE
'1.
Monitor
iig-
nal at
base of
A101.
Corect
wave{orm:
SEE NOTE
1. Measur€
rcltage
ar
pin
1
of
A1u6.
Shquld be >
+
2.7 V.
Reter
to
Logic Trouble-
shooting
suggestions
in Par-
agraph
7-39.
SEE
NOTE
1. N/leasure
rcltage at
pin
2 of 41u8.
Shouldbe>+3V.
Measure
voltagB at
pins
5
l0 of
A1U8.
Pin
5
should be.5.7V,
pin
l0
be
+
12 V. Toler-
and
7 o{
A1U8.
Both
pi
n.fer
to
Logic Trouble-
eooting
suggestions
in Par
4.a3h
7-3g.
throuqh
A1CR2,
3,
Replace
41CR1.
Figure
7-10.
Logic Clock
Troubleshooting
Tree.
7-2317-)1
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