HP 4262A User Manual

(B)——>|STOP _/~ A21U2pin?
Is
Signature at A21
U13 pin 8 CF87°?
START
_/~
A21U2pin7
START
_/~
A23PA8
STOP
~\_.
A23PAS8
CLOCK __/~ A22TP2
Is Signature of
+5V 0309 ?
Is
Signature
Set
41
\YES
Is
Signature
of
YES
+5V T2A7?
Is Signature Set 44*
OK?
CLOCK _/— A21U2pinl4
*See Table A
Press desired front NO
panel pushbutton. 3
Obs: i t
ooy signal a Check A21U14, U24, Check 21013 Is Signature Set 45¥\NO Check A23U1
YES
Troubleshoot
My
YES
_|
Ul0,
vl12,
U23,
Ull
an
.
OK?
and
UZ2.
Stuck
Node
?
desired
front
panel
4
’
Stuck Node. and U22. If OK
pushbutton. Can a Check A2 4
15msec
pulse
wave-
eck
A23U2.
YES
*See
service
sheet
23.
NO ’ form be observed?
15ms
Go to Flow Diagram B,
Check A21U2. l l
NO
Check keyboard
switch, A21U1
and U3.
Press
LOCAL
Is
Signature
Set
43
\NO
[
Is
Signature
Set
42
\NO
COLUMN
Check
keyboard
@—— pushoution. o_x{?j '\Ofy Bus Stuck? switch. -
YES YES
Nanoprocessor Check A21U11 Stuck Node ? Check A21U12 Troubleshoot
Data Bus Stuck? and U22. and U23. Stuck Bus.
YES
Troubleshoot ~ Troubleshoot
Stuck Bus. Stuck Node.
Figure 8-19. Digital Section Troubleshooting Procedures.
Flow Diagram H. A21 Board Diagnostic Flow Diagram.
Figure 8-19
Digital Section Troubleshooting Procedures
Flow Diagram G
SEE
INSIDE
8-41

HP 4262A Specifications

General

Brand	HP
Model	4262A
Category	Measuring Instruments
Language	English