HP 4262A Operating And Service Manual page 9

Model 4262A
TABLE OF CONTENTS
Section Title Page
V ADJUSTMENT .......... Cesseretreannaas 5-1
5-1. Introduction...........oveueuennnn.
5-1
5-3. Safety Requirements ..............
5-1
5-7.
Equipment Required
........00v...
5-1
5-9,
Factory Selected Components ......
5-1
5-12. Adjustment Relationships.......... 5-1
5-14, Adjustment Locations ............. 5-1
5-16. DUT Adjustment Recommendations . 5-4
5-1 Initial Operating Procedure........ 5-5
5-20. DC Power Supply Adjustment,...... 5-6
5-21. Nanoprocessor Operating Power
Voltage Adjustment.............. 5-7
5-22. Al2 Board Offset Adjustment....... 5-8
5-23. Al3 Board Offset Adjustment,...... 5-9
5-24. Al4 Phase Detector & Integrator
Adjustment ........c0iiiinnnn. 5-14
5-25. 10kHz Measurement Accuracy
Adjustment ......ciivviiennnnns 5-17
5-26. C Zero ADJ Circuit Adjustment
(AL2) L.ttt i et 5-22
VI REPLACEABLE PARTS ...cvvvnivienennss 6-1
6-1., Introduction.......eeovvvennnn eees B-1
6-3. Abbreviations ............. cerrras 6-1
6-5. Replaceable Parts List............ 6-1
6-7. Ordering Information ......... eees 6-2
6-12. Direct Mail Order System ......... 6-2
VII MANUAL CHANGES .. ..0iitvitverenennnn 7-1
7-1. Introduction..........ccvvvvueenn. 7-1
7-3. Manual Changes ......covvveevnnren 7-1
VIISERVICE .....vtiiiteiiiinsenecenconnnens 8-1
8-1. Introduction.........ceeoeeeenevenn 8-1
8-3. Theory of Operation .............. 8-1
8-5. Troubleshooting ............ creeas 8-1
8-7. Recommended Test Equipment ..... 8-1
8-9 Repair..civieeereninrannnns cesese 8-1
Section
8-11,
8-21,
8-22.
8-23.
Table of Contents
Title Page
Basic Theory ....vevvveeenecnnnas 8-2
Principles of Operation ,.......... 8-4
Block Diagram Discussion......... 8-8
Analog Section Discussion ...., 8-8
All Oscillator and
Source Resistor ....... 8-8
Al2 Range Resistor...... 8-8
Al3 Process Amplifier.,., 8-8
Al4 Phase Detector and
Integrator............. 8-8
Digital Control Section ....... 8-10
A23 Processor and ROM 8-10
A21 Keyboard Control .. 8-11
A22 Display Control
&RAM .......ccuvt.. 8-11
A2 Display and Keyboard 8-11
Timing Diagram Discussion....... 8-12
Options...vvverevennnnne cesesenn 8-14
Option 001 BCD Data
Output (A35) ...... ceeiaesens 8-14
Option 004 Comparator
(A4, A5 & A24)............. 8-15
Option 101 HP-IB
Compatible (A25).......... . 8-15
Troubleshooting ........c0vvveve. 8-16
Repair....ovvviieiiiennncennnasns 8-26
Removal of Q2 and Q3 ............ 8-26
Line Switch (S1) Removal......... 8-26
Protective Diode Replacement
(CR4, CR5, CR6 and CRT)...... . 8-27
ZERO ADJ Control Potentiometer
(R4 and R5) Replacement........ 8-217
A2 Keyboard and Display
Board Disassembly............. 8-27
Keyboard Switch LED Replacement 8-28
Product Safety Checks............ 8-29
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