HP 3490A - Page 193

Ralio
Adjust-
r4rap6 5-79.
lc W8
disconnected,
pin
2 oi connetor
,
ard U2
removed.
set FUNCTION
ro DC,
to
10
V.
Apply
any INPUT
voltag€
with
h*n
below,
and apply I
l0 V
to TPC.
bgac levels
a! sh@n:
lNote 2l
TPC
.
10 v
+
l0 v
10 v
-10v
TPD
U5(12)
LOW
HIGH HIGH
LOW
LOW
LOW
HIGH
LOW HIGH
HIGH
HIGH
LOW
Monitor
rcltage at W8
con-
n*tor
pin
5 while-spply-
ing+and-loV
at'TPA.
Voltage
at
pin
5 should
be+l0V
and-10V re-
spectiwly,
nedq
pin
13 while
apply-
ing
+
ahd
-
10 v .l
TPA.
Volhge
il
pin
13 should
be+1V and-1V r6p4-
tiwlv.
Replace
A13u4 or
5 as
indicated by
prwious
checka.
Atter reFir,
go
to
next
step.
Check
413U3 by subsri-
tuting a
ntu
p6n.
Ale
cl€ck
A13R9,tO arld feed-
back cirdit A13R13
thru
16.
Check Al3Bl 1A,8
dd Al3R12,
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