Figure 6-2. Signatures, Basic PROM Set
CONNECTIONS
BUTTONS
NODE
A105 JMP1 Pin 9
A105 JMPl Pin 10
A105
JMP1 Pin 11
A105 JMP1 Pin 12
+5V
PROGRAM CONTROL LED
STOP
A105TP15
OUT
?
START
A105 TP14
IN
&
If the counter
is
working sufficiently to access the test functions, program controlled signature analysis
can be used.
In program controlled signature analysis the start and stop (and therefore the signature)
are controlled by software. This allows the signature analyzer to be used, in many cases, to troubleshoot
the hardware outside the bus system.
CLOCK
A1 05 TP8
IN
&
SIGNATURE
8HU1
7068
F439
U774
1817
SELF DIAGNOSTICS
At turn on the counter performes several internal diagnostic checks, checking the RAM, PROM, and
the associated decoding circuitry. The display shows dashes during these checks. If the counter passes
the tests
it
then enters the normal operating mode. If
it
fails RAM check the display will show all Es
and
a
unique signature will be generated. If the counter fails any of the PROM checks an error message
will be displayed, and
a
signature will be generated. Please refer to figure 6-3.
NODE
A105
JMP1 Pin 13
A105
JMP1 Pin 14
A105
JMP1 Pin 15
A105 JMP1 Pin 16
The counter generates PROM error signatures only during the power up diagnostics check. It
is
necessary to turn the power off, and then on again, while the signature analyzer is connected, to
get
a
signature.
SIGNATURE
C38U
CU8P
7096
3H7-3
PROBLEM
Ram Bad
A105 U13 (Basic Program) Bad
A1 05
U
17 (Basic Program) Bad
A105 U15 (Basic Program) Bad
CONNECTION
BUTTONS
.
A1 07 U2 (Power Meter) Bad
A1 05
U
14 (Band 4) Bad
A105 U17 (GPIB or BCDIRMT) Bad
START
A1 06 TP5
OUT
?
STOP
A106 TP5
IN
&
ERROR
All E's
3 1
32
33
CLOCK
A1 05 TP8
IN
&
SIGNATURE
007 U
1 UFP
U399
P672
9FA8
2A2C
8AFH
PROBE
A105 TP6
(+5V)
Figure 6-3. Self Diagnostic Error Indications
Scans by ArtekMedia © 2007
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