HP 4262A User Manual

Are
Signatures at A22\yEs
US pin 14 and (17
START _/~ A23Ulpin33
STOP T\_ A23PA9
CLOCK ™\. A22TP4
START "\_ A23U1pin 33
STOP /- A23U1pta 33
CIOCK S/~ A22TP2
Are
Signatures at A22\yps
U9 pin 8 and UL7
OK?
Window Test
+5V UBH5?
Window Test
+5V H63P ?
\YES
Cathode Driver \YES Troubleshoot
Stuck Bus.
pin 3 pla 14 OK?
5
NO
NO
)
START
™\,
A23U1
pin
33
START
™\
A23U1pin
33
@
@
STOP
_/
A23UL
pin
33
STOP
./~
A23Ulpin33
©
Check
A22U8,
U1T
CLOCK
/-
A22TP2
CLOCK
—/~
A22TP2
U8,
U16
and
R20,
Is
Signature
Set
26
YYES
Troubleshoot
T
OK?
Sack
Node,
.
T
Window
Test
Signatures
at
A22
Multiplexer
+5V
H63P?
1s
Siguature
Set25\WES
(18
sgngu};x;e
Set
27W¥ES
("
110
vin
1
and
V1B
LS
Output
m\;:dm:
NO
§
pin
1
OK?
Stuck
Node
?
c
e
Bied NO NO NO
eatify incorrect
siguature.
6
Replace
defective
Check
A22U10
componenl(s).
‘Troubleshoot
-
Stuck
Node.
Window Test
+5V HE3P?
‘Troubleshoot
Stuck Node,
Con{irmation Check
Signature Set 24
OK?
Decoder Qutput
Stuck Node?
T~Segment
Decoder Output
Stuck Node ?
Check A22US.
Is Sig Set 27)YES
OK?
Go to Flow Diagram @
1s Signature at A22
U2 pin 5 4P0T?
Scan Counter
Output Bus Stuck?
Identify incorrect l Check A22U2,
Check A22U13 signature,
Replace defective
component(s).
Data-Bus
Drv/Rec Output
Bus Stuck?
Ko
o Check A22U19
and U20.
N
. -
Flow
Diagram
F.
A22
Board
Diggnostic
Flow
Diagram
(Dispaly
Control).
Figure
8-19.
Digital
Section
Troubleshooting
Procedures.
. . Figure 8-19
Digital Section Troubleshooting Procedures
Flow Diagram E
$EE INSIOE 8-39 8-40

HP 4262A Specifications

General

Brand	HP
Model	4262A
Category	Measuring Instruments
Language	English