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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.
n b l e
80-1
6a. Data Line Signatures,
@
Step 9 (2314A to 2333A)
n b l e 80-1 6b. Data Line Signatures,
@
Step 9 (23344 to 2426A)
Service Sheet BD5
8D-55
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