HP 3490A - Page 185

M YGE
THAN
I
Iiü
'NG
LESS
THAN
NO
.
oft-".*l
tr
2uo30FJ5,
l
EB
SCe€
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I
EC
S€frtOil
OF
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f
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r_l
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Figure
7-14.
Sample/Hold
General Troubleshooting
Tree.
CHECK
FErS
azot,
02
Aito o:t
FoR
LEAKAGE.
ATSO
CHECK
A27C9
ANO
CIO FOR
LEAKAGE.
CHECK
VOLTAGE
AT A27TP2,
CHECK
FETS
A2706,
07 ANO
09 FOR
LEAKAGE.
ALSO
CHECK
A27CI2
AND
C18
FOR
LEASG€.
REMOVE
GROU]ID
OONIITECTIOI{
FROM
LTST.
WITH
INPUT
SHORTEO.
SELCCT
IO V
RMGE,
SET
SAi'PLE
RATE
TO
HOLD.
M€ASURE
VOLTAGE
AT
N7P3.
I
12 V
ANO
ORIFTING
L€SS
THAN
IS
VOLTAG€
T{EAR
ZERO?
TROUALESHOOT
AMPLIFI€R
B
u6, 06,
o?t.
ISVOLTAGE
TIEAR
ZERO?
TROUELESHOOT
OFFS€T
AMPLIFIER
i:l*o
^no
AssocrarEo
@MPG
5490-
D-
3437
't3t17-32
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