Model 8901B Service
I
Test Point Signature'
DATA
0
Table
80-15.
Address Line Signatures,
@
Step
6
Test Point Signature'
DATA 4
Test Point
DATA
1
DATA
2
DATA 3
Signature
ADDRESS
15
ADDRESS 14
ADDRESS 13 3696
ADDRESS 12 HAP7
ADDRESS
11
ADDRESS 10 HPPO
ADDRESS 9 2H70
Replace with DATA
5
Replace with
latest parts. DATA 6 latest parts.
DATA 7
Test Point
ADDRESS 8
ADDRESS 7
ADDRESS 6
ADDRESS
5
ADDRESS
4
ADDRESS 3
ADDRESS 2
ADDRESS
1
ADDRESS
0
Test Point
Signature' Test Point
DATA
0
4FOC DATA
4
DATA
1
2C60 DATA
5
DATA 2
1
OH0 DATA
6
DATA 3
C14U DATA 7
Signature
HC89
52F8
UPFH
OAFA
5H21
7F7F
cccc
5555
uuuu
Signature'
3FH0
48FC
9H29
89CU
I
Test point
on
Controller Assembly
A13TPlO
(+5V).
9.
Switch POWER to
ON.
Check the
CONTROL
BUS test points on the extender board with the
signature analyzer
probe
as listed in Tables 8-16a through 8-16h.
If
signatures are faulty, see
Service Sheet
24
and check the Decoders and
ROMs.
NOTE
The signatures below are valid only
for
the firmware with the specified
ROM
part numbers. Consult Section
7,
Instrument Changes,
or
the
Man-
ual Changes Packet
for
signatures corresponding to other firmware part
numbers.
nble
80-1
6a.
Data Line Signatures,
@
Step
9
(2314A
to
2333A)
nble
80-1
6b.
Data Line Signatures,
@
Step
9
(23344
to
2426A)
Service Sheet
BD5
8D-55
To Next Page
