HP 4262A User Manual

Model 4262A Section VIII
Figure 8-12
‘ Signature Analysis Diagnostic Flow Diagram Notes.
START 1. Both START and STOP signals are taken
from A23U1 pin 37. CLOCK signal is
taken from A22TP2. Front panel control
settings for Signature Analyzer are:
1 |START __[— A23U1(37)
. STOP —1_ A23U1(37)
CLOCK __I— A22TP2
START button: released (ML)
STOP button: depressed (_m.)
CLOCK button: released (L)
2
NO
2.
Checks
that
signature
of
+5V
supply
is
@
5CAU.
If
incorrect,
go
to
Flow
Diagram
number
3.
3
Signature
Set
11
Replace
3.
Compares
actual
signatures
with
signature
9
g
set
@
on
the
signature
map
(see
Figure
OK:
A22U3
B).
If
not
identical,
replace
A22U3.
4. Check signatures with respect to nanopro-
cessor direct control bus line. If incorrect,
check every component on faulty bus line.
Troubleshoot
Stuck Bus
Figure A. Diagnostic Flow Diagram Notes.
|14 F566 ]
_in HU78
'
o
®
U21 i
g I F78F
: o1 3 C6F8
CLK, ® )
9653],
+5V
Figure B. Signature Map Notes.
Figure 8-12. Signature Analysis Guide (sheet 3 of 3).
8-25

HP 4262A Specifications

General

Brand	HP
Model	4262A
Category	Measuring Instruments
Language	English