Table of Contents
Model
3455A
TABLE OF CONTENTS (Cont'd)
Section
Page
VI. REPLACEABLE
PARTS
6-1
6-1.
Introduction 6-1
6-4.
Ordering
Information
6-1
6-6.
Non-Listed Parts 6-1
6-8.
Parts
Changes 6-1
6-10.
Proprietary
Parts
6-1
6-12.
Exchange Assemblies 6-2
6-
15. Service
Kit
6-2
Section
Page
VII. MANUAL CHANGES
7-1
7-
1. Introduction
7-1
Section
Page
VIII.
SERVICE
8-1
8-
1
Introduction
8-1
8-3.
Safety Considerations
8-8. Recommended Test
Equipment
8-1
8-10.
Introduction
8-2
8-12.
Input
Switching and DC Attenuator.
.
.8-2
8-13. General
8-2
8-15.
Detailed Description
8-2
8-17.
Operational
Attenuator
8-2
8-19.
Auto Calibration-DC
Voltage
8-2
8-20.
General
8-2
8-22.
Circuit
Description
8-4
8-34. Auto-Calibration-Ohms
8-9
8-35.
General
8-9
8-37. Circuit Description
8-9
8-42.
Auto
Calibration-A/D Convertor. . .
.8-10
8-44.
Circuit
Description
8-11
8-47. True RMS AC Convertor
8-11
8-48.
General
8-11
8-50.
Circuit Description
8-11
8-56. Average
Responding
AC Convertor
(Option 001)
8-12
8-57.
General
8-12
8-59. Circuit Description
8-12
8-65.
Ohms
Convertor
8-13
8-66.
General
8-13
8-68.
General
Description
8-13
8-73.
DC Preamplifier
8-14
8-74.
General
8-14
8-76.
Circuit Description
8-14
8-82.
Reference Assembly
8-16
8-83.
General
8-16
8-85.
Circuit
Description
8-16
8-87.
Analog-to-Digital
Convertor (A/D)..
8-16
8-88. General
8-16
8-92.
Circuit
Description
8-17
8-103. Inguard Controller
8-19
8-104. General
8-19
8-107. Circuit Description
8-19
8-M5. Main Controller
8-22
8-116.
General
8-22
8-118.
Circuit Description
8-23
8-141.
HP-IB Circuit
8-29
8-142.
General
8-29
8-144.
Circuit Description
8-29
8-168.
Front Panel Operation
8-32
8-169.
Circuit Description
8-32
TROUBLESHOOTING
8-174.
Introduction
8-35
8-176.
General
Block Diagram Theory
of Operation
8-35
8-179.
Outguard Section
8-35
8-185.
Inguard Section
8-36
8-194.
Preliminary Troubleshooting Check..
8-36
8-195. Instrument Half-Splitting
Techniques
8-36
8-198. Service
Group Summary
8-37
SERVICE GROUP A
8-A-l Turn-On
Circuitry (Inguard and
Outguard)
8-40
8-A-3. Inguard/Outguard
Isolation
8-40
8-A-5.
Outguard Troubleshooting
(Schematic
8)
8-40
8-A-6.
Inguard Troubleshooting
(Schematic
5,
6, 7)
8-40
8-A-8.
AlO Motherboard Troubleshooting
(Schematic
5, 6,
7)
8-40
8-A-lO. A/D Board Troubleshooting
(Schematic
5,
6)
8-41
8-A-12.
Inguard/Outguard Transfer Circuit
Troubleshooting (Schematic 7,8)
8-41
SERVICE GROUP 6
8-B-l. Auto-Cal and DC
Troubleshooting
(Inguard)
8-43
8-B-3. Auto-Cal Constants
8-43
8-B-9. Auto-Cal
Switch Closures
(Schematic
1,
5, 6, 7)
8-50
8-B-l I . Cal Constants
Service
Procedure
8-50
8-B-14.
Switch Closure Table
8-52
8-B-16.
Auto-Cal Troubleshooting
(Schematic I, 7)
8-52
8-B-18. DC Inoperative (Schematic 1)
8-54
8-B-20. Leakage and Other
Various
Malfunctions
8-54
8-B-23. 10
V
Range or
Constant 10 and 11 Fail. .
.8-55
8-B-24.
1 V Range or Constant
0,
I
,
and 2 Fails . .
8-55
8-B-25. 100
mV
Range or Constant 3
Fails
8-55
8-B-26.
100 V Range or Constants
5, 4,
and 7
Fail
8-55
8-B-27. 10(X)
V
Range or Constant 6 Fails
8-56
8-B-28.
Various
Other Malfunctions
8-56
8-B-30. Other Troubleshooting Hints
8-57
8-B-3I. General Noise
8-57
8-B-33. IX: Noise
(Schematic
1, 5.
and
6)
8-57
iv
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