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3720A
HP 3720A User Manual
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I-
J
.
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-
-
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HEWLETT
'TPACKARD
u
SERVICE
MANUAL
MODEL
3720A
SPECTRUM
DISPLAY
SERIAL
PREFIX
This
manual
applies
to
all
instruments
having
serial
prefix
1209U.
Instruments
with
a
serial
prefix
above
1209U
may
have
a
Manual
Change
Sheet,
to
which
reference
should
be
made.
WWW.HPARCHIVE.COM
For
Free
Distribution
Only
,.
Copyright
HEW
LETT-PAC
KAR
D
LIMITED
1972
SOUTH
QUEENSFERRY,
WEST
LOTHIAN,
SCOTLAND
03720-95001
WWW.HPARCHIVE.COM
Printed:
APRIL
1972
I
2
4
Table of Contents
Default Chapter
5
Table of Contents
5
Accessories Furnished with 3720A
11
General Servicing Instructions
11
Operating Instructions
11
Section I Introduction
11
Front Panel Controls and Indicators
12
Rear Panel Controls and Connectors
14
Section II General Maintenance
15
Identification
15
Assembly Connection Identification
15
Integrated Circuit Identification
15
Removing Top and Bottom Covers
16
Front Panel Access
16
Removing Side Covers
16
Introduction
15
Maintenance
17
Locations of DC Power Supply Fuses
17
Replacement of Display Sensitivity Lamps
17
Cleaning the Air Filter
18
Cathode Ray Tube Removai/Repiacement
18
Line Transformer Removal/Replacement
19
Chassis Mounted Transistors Plate Removal/Replacement
19
High Voltage Tripler Assembly Removal/Replacement
19
Repair Procedures
19
Etched Circuits
19
Integrated Circuit Removal/Replacement
20
3-9
21
3 8 List of Abbreviations
21
Replaceable Parts
21
3-1
70
3 Code List of Manufacturers
70
Section IV System Troubleshooting
71
Introduction
71
Using Troubleshooting Section
71
Test Equipment
72
Logic Probe
72
System Troubleshooting Controls Set-Up
73
FLOW a . Control Faults
75
Display Sensitivity Faults
76
4-16
77
4 FLOW C . Data Transfer Faults
77
FLOW D Other Transferred Signals Faults
78
FLOW D(A)
78
Timescale Transfer Faults
78
Gain Correction Factors Transfer Faults
79
4-6
80
4-5
80
4-4
80
4-25
80
4-23
80
4-21 FLOW D . Other Transferred Signals Faults
80
FLOW D(C) . Signal Recovery Transfer Faults
80
Gain Correction Factors Check
80
Signal Recovery Transfer Check
80
Introduction
81
Drawing Symbols
81
5-3
81
Assembly Packages
81
Locating Assembly Packages
81
Theory of Operation
81
Functional Diagram
81
Figure
85
4
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HP 3720A Specifications
General
Brand
HP
Model
3720A
Category
Measuring Instruments
Language
English
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