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4262A
HP 4262A User Manual
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Section
VIII
Paragraph
8-52
8-52.
KEYBOARD
SWITCH
LED
REPLACEMENT.
a.
Perform
steps
a
through
g
of
paragraph
8-49,
Protective
Diode
Replacement.
b.
Remove
8
screws
((D
through
@
in
Figure
8-14)
fastening
A2
bgard
to
front
panel.
c.
Take
out
A2
board
from
instrument.
d.
Remove
pushbutton
switch
by
melting
plastic
legs
of
the
switch.
Use
tool
HP
P/N
5951-8516.
e.
Unsolder
defective
LED.
f.
To
assure
that
the
newly
installed
LED
will
not
rub
against
the
switch
plunger
(when
pushbutton
is
pressed),
a
soldering
guide
is
required.
Fabricate
a
soldering
guide
from
a
piece
of
3.18mm
(0.125
inch)
intemal
diameter,
thin
walled
plastic
tubing
4.76mm
(3/16
inch)
in
length.
If
tubing
is
not
available,
use
a
4.76mm
strip
of
paper
rolled
to
make
up
an
approximate
1.
D.
of
3.18mm.
g.
Insert
tubing
(or
rolled
paper)
into
bottom
of
plunger
of
new
switch
(see
Figure
8-15).
h.
Insert
the
new
LED
into
bottom
of
switch
plunger
containing
tubing.
i.
Rotate
LED
(in
bottom
of
switch
plunger)
so
that
the
shortest
lead
passes
through
the
P.
C.
board
mounting
hole
(identified
with
dot
marking).
See
Figure
8-16.
Model
4262A
j.
Install
switch
and
LED
combination
onto
A2
board
assembly.
k.
Grasp
LED
leads
(back
side
of
A2
board)
and
pull
LED
flush
against
front
side
of
A2
board.
1.
Solder
LED
to
A2
board
assembly.
CAUTION
WHILE
SOLDERING
LED,
PRESS
SWITCH
AGAINST
FRONT
SUR-
FACE
OF
A2
BOARD
ASSEMBLY.
BE
CAREFUL
NOT
TO
MELT
PLASTIC
LEGS
OF
SWITCH
OR
TO
CONTAMINATE
IT
WITH
SOLDERING
FLUX.
m.
Take
off
switch
and
remove
tubing
(or
rolled
paper)
from
switch
plunger.
Clean
any
re-
residual
flux
from
A2
board
assembly.
n.
Mount
switch
over
LED
and
operate
switch
several
times
to
assure
that
switch
plunger
does
not
rub
against
LED,
and
that
the
light-
pipe
in
key-cap
does
not
contact
LED
before
switch
plunger
bottoms.
Note
If
the
results
of
step
n
are
not
satisfactory,
repeat
the
LED
instal-
lation
procedure.
o.
Install
switch
(over
new
LED)
onto
A2
board
assembly.
Figure
8-15.
Inserting
Tubing
Into
Switch
Plunger.
8-28
Figure
8-16.
LED
Installation
in
Switch.
200
202
Table of Contents
Table of Contents
8
Introduction
14
Model 4262A and Accessories
14
Offset Adjustment
15
Specifications
20
Safety Considerations
20
General Information
20
Serial Number Plate
20
Accessories Supplied
21
General Component
22
Introduction
24
Initial Inspection
24
Lcr
24
Power Cable
24
Voltage and Fuse
25
Installation Instructions
26
Installation of Options 907, 908 and 909
26
Environment
26
Rack Mount Kit
28
Coupling Option 004 Comparator
29
Option 101 HP-IB Remote Control and Data Output Installation
29
Option Components
31
Switch Setting
32
Front Panel Features
33
Offset Adjustment
41
Measurement Error
42
Relationship of Dissipation to Series and Parallel Resistance
44
Unusual Operating Indications
54
Option Operation
58
Option 001: BCD Parallel Data
58
Output
58
Alternate Output of LCR and
58
Assignment
58
Output Timing
58
Option 004-COMPARATOR
62
Front Panel Features
63
HP-IB Interface Capabilities
63
Functions Relate
64
Service Request
64
Remote Program Codes
65
Remote Message Coding
66
Remote Message Coding
67
Equipment Required
68
Testrecord
68
Calibration Cycle
68
Accuracy Checks
68
Preliminary Qperations
69
Calibration of Dut's
72
Capacitance Accuracy Test
75
Test Signal Level
78
Resistance/Esr Accuracy Test
79
Inductance Accuracy Test
84
Inductance Accuracy Test Setup
84
Internal DC Bias Source Test
86
Internal DC Bias Source
86
Offset Adjustment Test
87
Specifications
87
Offset Adjustment Test Setup
87
HP-IB Interface Test Setup
92
Test
98
Vadjustment
106
Introduction
106
Safety Requirements
106
Equipment Required
106
Factory Selected Components
106
Adjustment Relationships
106
Adjustment Locations
106
Adjustable Components
107
Factory Selected Components
108
DUT Adjustment Recommendations
109
Initial Operating Procedure
110
DC Power Supply Adjustment
111
Adjustment
111
Nanoprocessor Operating Power
112
Waveform at A13TP2
116
Waveform at A13TP3
117
Zero Detector & APAO
120
10Khz Measurement Accuracy
122
C Zero ADJ Circuit Adjustment
127
Adjustment
127
Replaceable Parts
129
Abbreviations
129
Replaceable Parts List
129
Introduction
129
List of Reference Designators
129
Replaceable Parts
139
Major Mechanical Parts - Exploded View
151
Mechanical Parts - Exploded View
152
Manual Changes
154
Introduction
154
Summary of Changes by Assembly
154
Theory of Operation
168
Troubleshooting
168
Recommended Test Equipment
168
Repair
168
Basic Theory
169
Front Panel Features
169
Principles of Operation
171
Block Diagram Discussion
176
Analog Section Discussion
176
Digital Control Section
178
A23 Processor and ROM
178
A21 Keyboard Control
180
A22 Display Control
180
A2 Display and Keyboard
181
Timing Diagram Discussion
183
Options
185
Comparator
185
Option 004 Comparator
187
Option 101 HP-IB
187
Compatible (A25)
187
Troubleshooting
189
Repair
189
Symptoms Likely to Mislead
191
Front Panel Isolation Procedure
193
Removal
199
Protective Diode Replacement
200
ZERO ADJ Control Potentiometer (R4 and R5) Replacement
200
Rear Panel
217
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HP 4262A Specifications
General
Brand
HP
Model
4262A
Category
Measuring Instruments
Language
English
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