HP 3455A - Page 194

The
following signatures ere for the outgo
erd RAM
circuits.
The
signatures are taken with the start/stop
inputs of the signature
analyzer
connected
to
A3TR1.
NOTE
•*Th«« slgnaiurti apply whtn V44
and
U4S
art
removed from their tochets.
•To obtain this
signature,
a 10
K resistor must be
connected between the
5
volt TP
and
the probe
Up
of the signature
analyeer.
To check
for proper logic
tracer connections
verify
signature
of
*S
lest point Is
4FS3. The
signatures In
>6V: 4F53
Oils
section take one or
two
readings
to
stabllUe.
Pin
Signature
U34
1
7622
2
184P
3
1B4P
4
7622
S
7FPH
6
7FPH
7
0000
B
AFOP
9
AFOP
10
7622
11 UHUC
12
UHUC
13
7622
14
4FS3
U35 1
3A71
2
184P
3
184P
4
3A71
5
7FPH
6 7FPH
7
0000
8
AFOP
9 AFOP
10
3A71
11
UHUC
12
UHUC
13
3A71
14
4FS3
U36 1
4FS3
2
F281
3
AFOP*7078V
4
UHUC*F757*,*
5 7FPH*15FU*.*
6
184P*97C6*,’*
7
183F
8
0000
9
1PP6
10
183F
11
671
F
12
FF11
13
1UFP
14
143A
15
68P0
16
4F53
rin
Signature
U37 1 4FS3
2 F281
3
P6PH*3A9C*.*»
4
P961*H3FH*/*
5
8CPA*P2F8*.**
6
PH16*62PP*/*
7 4F53
8 0000
9
1PP5
10
4F53
11 93AF
12
U6FF
13 OHAH
14 4AC4
15
183F
16 4F53
U38 5
1PP5
8
1PP5
11 F281
12 1PP5
13
9037
U39 8
HF64
9
9037
U42 1 7822
2
P6PH
3
P6PH
4
7622
5
P961
6
P961
7
0000
8
PH16
9
PH16
10 7622
11
8CPA
12
8CPA
13 7622
14
4F53
U43 1 3A71
2
P6PH
3
P6PH
4
3A71
5
P961
6
P961
7 0000
8
PH16
9
PH16
10
3A71
11 8CPA
12 8CPA
13 3A71
14 4F53
Pin Signature
U44 1
93AF
2
U6FF
3
OHAH
4 4AC4
5
1UFP
6
FF11
7
671F
8 0000
9
AFOP*7078’.’
10
184P*97C6*,**
11
UHUC*F757*.*
12
7FPH*15FU*.’
13
9037
14
7622
15
MSA
16
4F53
U45 1 93AF
2 U6FF
3
'
OHAH
4
4AC4
s
1UFP
6 FF11
7 671F
8 0000
9
PH16*62PP*.**
10
8CPA‘P2F8',**
11
P961*H3FH‘/'
12
P6PH*3A9C*.*'
13 9037
14 7622
15 143A
16
4F53
U46 1
HF64
2
7622
3
3A71