HP 8753D Option 011

V
erify the
A15 Preregulator
Verify
that the
A15 preregulator
is supplying
the correct
voltages
to the
A8
p
ost
regulator.
Use
av
oltmeter with
a
small
prob
e
to
measure
the
output
v
oltages
of
A15W1's plug.
Refer to
T
able
5-2
and
Figure
5-6
.
If
the
voltages
are not
within tolerance,
replace A15.
If
the
v
oltages
are
within
tolerance,
A15
is
v
eried.
Con
tin
ue
to
\Chec
k
for
aF
aulty
Assem
bly
."
T
able
5-2.
Output
V
oltages
Pin A15W1P1
(Disconnected)
Voltages
A8J2
(Connected)
V
oltages
A15
Preregulator
Mnemonic
1,2 +125
to
+100
+68
to
+72
+70
V
3,4 +22.4 to
+33.6
+17.0 to
+18.4
+18 V
5,6 0
22.4
to
0
33.6
0
17.0
to
0
18.4
0
18
V
7 N/C N/C N/C
8 +9.4
to +14
+7.4
to +8.0
+8
V
9,10 0
9.4
to
0
14
0
6.7
to
0
7.3
0
8
V
11 +32
to
+48
+24.6
to
+26.6
+25
V
12 N/C N/C N/C
NOTE:
The
+5VD
supply
m
ust
b
e
loaded
b
yone
or
more
assem
blies
at
all
times,
or
the
other
v
oltages
will
not
b
e
correct.
It
connects
to
motherb
oard
connector
A17J3
Pin
4.
Figure
PLUG5
here.
Figure 5-6. A15W1 Plug Detail
5-8 Power Supply Troubleshooting DRAFT
3/21/106 15:12
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