Tektronix 11302A User manual

TEK
SERVICE
MANUAL
FirstPrinting AUG 1988
Revised SEP 1988
11302A
Part No. 070-7179-00
Product Group 47
Counter Timer Oscilloscope
Service Reference Manual
WARNING
The following service instructions are for use by qualified personnel
only. To avoid personal injury,
do not perform any servicing
unless you are qualified to
do so. Refer to the Safety Summary
prior
to performing any service.
Please check for CHANGE INFORMATION at the rear of this manual.

. -.
•• ·J
INSTRUMENTSERIAL NUMBERS
Each.instrument has a serial number on a panel insert, tag, orstamped on the chassis. The first number or letter
designatesthe country of manufacture. The lastfive digits ofthe serial number are assi
gned sequentiallyand are
unique
to each instrument. Those manufactured in the United States have six unique digits. The country ofmanu-
·racture
is identified as follows: · ·
BOOOOOO
100000
200000
300000
700000 .
Tektronix, Inc. Beaverton, Oregon, USA
TektronixGuernsey, Ltd., Channel Islands
Tektronix United Kingdom, Ltd., London
Sony{fektronix, Japan
Tektronix Holland, NV, Heerenveen, The Netherlands
Tektronix, thc., P.O. Box500, Beaverton, OR 97077
. . .
Copyright © Tektronix, Inc., 1988. All rights reserved. Tektronix products are covered by U.S. and foreign patents,
issued and pending. TEKTRONIX, TEK., SCOPEMOBILE and iJ are registered trademarks.
MS-DOS® is a registered trademark of Microsoft Corporation.
Printed in U.S.A.

Contents
List of illustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Safety Summary. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . x
Section 1- Ge neral Inf ormation
Introduction . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l-1
Operating Power Information .. .... . .... :. .. .. . ....... .... . .. . ..... . .............. .. ..... . .. . . 1-1
Power Co rd Infonnation . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Operat ing Voltage .... . .. . .............. . ......... .. ........... . ..... .. ................. 1-2
Memory Bac ku p Power . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Operating Environment . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Operat ing Tempera tur e ........................ . ................... . .... . . .............. 1-4
Ventilation Requirements .. .... . .... .... ......... .. .. . ...... .. ............... .. . . .... ... . 1-4
Instrument Options ........... . ... . .. . . . .. . ........... . ....... .. ....... .. .................... 1-5
List of Optio ns ............... . ........• . .......... .. ........... . ..... . .... . ....... . .. . . 1-5
Option lC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Option lR ........................ . .................. . ............................ 1-5
Option lT .. . ................................................ . .......... .. ........ 1-5
Option Al . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1- 5
Option A2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1- 5
Option A3 . . . . . .• . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . •. . . . . . . .. . . . . . . . • 1-5
Option A4 . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1- 5
Option AS . . • • . . . •. . . . • . . .• . . . . . . . . . . . . . . . . . . . . • . .. . . . . . . . . . • . . . . . . • . . . . . . . . . . . . . . 1- 5
Section 2- Checks and Adjus tm ents
Installing and Removing Plu g- In Units ................................ . .. . ........ .. ....... . .... 2- 1
Minimize the Time Power is Off . . . . . . . . . . . . .. •• .. . . . . . . •. . . . . . •. . .. . •. . . . . . . . . . •. . . . . . . .. . . . . . 2- 1
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
RS-232 Ca ble Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Using the CATS Software . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Creating a Working Disk For a Dual-Floppy Drive System ........................... . ... 2-5
Installing CATS Software on a Hard Disk System . ....... .. .. ....... . .. . . ..... .. ....... . 2-5
Running the CATS Software . . .. .. . .. . . . .. . .. . .... . . . .. . . .. . . .. . .... . . . .. . .. . . . .. . . . 2-6
Selecting Menu Items: Default Selection is Highlighted ... . ............................. 2-6
Exiting from CATS and Othe r Fl Key Options ................. .. ...................... 2-7
Other Fu nction Keys . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Storing and Reloading Mainframe Calibration Constants .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Test Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 2-8
CATS SRQ Messages .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
CATS Erro r Messages .... . . . ... . ........ . ........ . ......... .. .......... . ...... . .... 2-9
11302A Service Reference i

Contents
ii
Using this Procedure ....... . ............ . . . . . ........................... . .. . ........ . ...... . 2-10
Fonnat Conventions
............. ..................... .. .... . ........ ... . ......... . 2-10
Tenns Used .... .. ................ .. ............................................. . 2-10
Mainframe Menu Selection
and Measurement Techniques ............... . ........... . . . 2-10
Abbreviated Seque n ce for Pcrfonnancc Verification ............ ... ............. . ...... . 2- 11
Mainframe Preparat io n .. .. ...... .. . .... . . . ..... . ............... . .......... . . . ......... . . ... . 2-12
Part 1 - Power Supply
... . ............. . ......................... .... ............... . ...... . 2-14
Examine Supply Voltages
........................................... .. ... .. ... . .... . ... . 2-14
Adjust + 5.2 V Reference
........... .. ...... . ........ ... ................. . ............. . 2-17
Adjust Regulator Reference
................... . ... .. ...... . ... .. .... ......... .. . . .. . ... . 2-19
Part 2 - Extended Diagnostics
.............................................. . ............... . 2-21
Part 3 - Touch Screen
............................ .. ....................................... . 2-22
Touch Screen Sensitivity Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
Part 4 - CVR Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27
Part 5 -
AID Converter . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29
Part6 - ACVS Gain .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31
Part7 - Front Panel DisplayAdjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 2-34
Part 8 - Display Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35
Cathode Voltage
... . ....... ............ .. . .......................... . ................. 2-36
Grid Bias . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38
Y-
Axis Alignment ....... .. ......................... . ............................ . ..... 2-40
Display Clarity and Geometry . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41
Part9 - Stored Waveform Vectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 2-44
Part
10- Spot Shift ....... . ...... . ..... . ...... . ......... .. ...... . .......... . . . .............. 2-47
Spot Shift Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49
Part
11 -Readout Jitter .... . ......... . ............................ . ....... . ............ . ... 2-51
Vertical Readout Jitter
.... . ................................ . ..... . .... ... ........ . ..... 2-51
Horizontal Readout Jitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . 2-53
Part
12 -Vertical Center ......... .. .................. . ...... . ..... .. ..... . ....... ... ....... 2-55
Part
13 -Magnified Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . .. . . . . . . . . . 2-57
Part 14 - XY Phase . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-59
Part 15 - Plug-In Interface Gains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-62
Vertical Gain ..... . ......... . .......................... . ...... ... ......... ... .. ....... 2-62
Horizontal XY
Gain .. .. .. .. . .... .... .. . .. .. .... .. ... .. .. . .. .. ... ..... ... .. .. . ... ... .. . 2-63
Part
16- Vertical Center (Second Pass) .. . .............. . ....... . .................... . ........ 2-64
Part
17 -Sweep Slew Rate Selfcal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66
Part
18 -Sweep Gains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-67
Part
19 -Beam Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-69
Part
20 -Cursor to Graticule Match . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-73
Part
21- Reference Oscillator ......... .. . .... . ... .. ............... .... ......... . ............ 2-74
Part
22 -Front Panel Calibrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78
Fro
nt Panel CAUBRATOR Output Adjustment .. ......... . .... .. ...... . .................. 2-80
Part
23 -Intensity Se ttings ...... . ...... . ...... .. ...................... .. .... .... .... . . .. .... 2-81
Part
24 -CharacterControl . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 2-85
Part
25 -Install Instrument Covers/Store Cal Constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-86
Part
26 -Sweep Timing Accuracy .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .. . . . . . . . . . . . . . . 2-87
High Speed Linec:rity Adjustment . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-89
5 ns Timing Adjustment . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-93
Main Sweep 1 nsTiming Adjustment ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94
Delayed Sweep 1
ns Timing Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . 2-95
Delayed Sweep
500 psTiming Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96
11302A Service Reference
.......,_

Contents
P
art 27 - Delta Delay Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 97
P art 28 -ProbeSkew Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-98
Part 29 -Ve rt ical High F req uency Response ...................... . ........................... 2- 99
Vertical Hi gh Freq uen cy Gain ... . ................ .. ........ . .. . .. . . . .... .. ........... . . 2- 100
Ve rt ical Ste p Response ..... . ............ . ........ . .................................... 2-102
Count er View Step Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-104
Ve rt ical Amplifier Adjust ment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-106
Coun te r View St ep Response Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . 2-112
Part
30 - Vert ical/Measurem ent Accuracy .................................................... 2- 114
P art 31 -Trigge r F ilt ers .................. .. . . ............ .. .......... ... ....... ... ... . .. . . 2-116
P
art 32- Trig ger Noise and Sensitivity ....................................................... 2-118
Pa rt 33 -Trigger Sensi ti vity .. ____ . ___ __ .. _ .. __ ... . __ ... ___ .. _. _ .... _. _ .... __ .... __ .... __ _. _ 2-119
Trigger Sensitivity Adju st men t: Main ... __ . ______ .... _____ .. ___ . _. _. ___ .. ____ . ______ . __ __ 2-121
Trigger Sensitivity
Ad justment: De layed .............................................. _ ... 2-122
P
art 34 - Trigger Accuracy ...... . . . . ................ .. ................................. _. _. 2-123
In ternalTrigger Accuracy ........ . .... . . .. ............. . ... . ..... . .......... . ...... . .. . 2-123
External Trigger Accuracy
................ . ... . ........... . ..... .. ... . ..... .. .......... 2-124
External
Counte r Timer Trigger Accuracy . .. . .... . .. . .. .... . .. .. . .. . .... . .. . .. .. . .. .. . .. . 2-125
Part
35- Line T ri gger ...... . ... ... .. . ....... . ....... . ........ . ..... . ...................... 2-126
P
art 36 - Cente r Co mpartment X- Axis Accuracy ............................. . ................ 2-127
P
art 37 - R ear Pane l Inp ut/O u tput Signals ................ . ................ .. ................ 2-129
Part 38 -Counter Ref er en ce Clock In/Ou t ................................................... 2-132
Part 39- Freq uen cy Accuracy ..... . ..... .. .... . . . . . .............•...... .. ........ . ......... 2- 134
P
art 40 -External A an d B In put Sensitivity ............. .. ...... .. ........................... 2-135
Part 41 - 2
ns Holdoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-136
P
art 42 - Holdoff By Ev en ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . 2-137
P
art 43- Time Interv al Using Sweeps ...... . ................................ .. ... .. ..... . ... 2- 138
P art 44 - Minim um Time In terv al . . . .. . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-139
P
art 45- VideoTrigger ... . ......... . .. . ......... ... ............... . ...... . .. .. ...... ... .. 2-140
P
art 46 - Store Cal Constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . 2- 142
Pa
rt 47- Rese t DIP Switch es and Set Time/Dat e . . .. .. . .. ........ .. ..... . ..... .. .......... . ... 2-143
Section 3- Maintenance
Preve nt i ve Maintenance .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Cab inet Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 3- 1
Cleaning . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . .• . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1
Exterior ..... . ....... . ......... . .. . .. . .... . ............ . ............................... 3-2
CRT ............................. .. ...... .... ................. . ........... .. .......... 3-2
In t erio r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Visual Inspection .. . ....... . . .. ..... . ...................................... . . .. ...... .. .. .... 3-3
Periodic Electrical Adjust ment .............. ..... ..... . ... . ...................... . ........... . 3-3
Con-ective M aint enan ce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Pow er Supply Vo ltage Hazard ......... . ....... . ........................ .. . . .... . . . ...... .. .... 3-4
Ordering Parts . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Static- Se nsitive Device Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Removing and Re placing FRUs ..... .. ....... . .... ... .. ............. . ...... .. ...... , . . ....... . . 3-7
Electrical Lock-On of the ON/STANDBY Power Switch . .. .... . .......... .. ....... .. ........ . .... 3-8
Power Supply Module Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Fan Motor Removal ........ .. ..... . ........................ . ................ . .............. 3-14
Cath ode -Ray Tube Removal .. . ......................... . .... .. ............................ . . 3-15
Cathode-Ray
Tube Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
1l302A Service Refer ence iii

Contents
iv
Lithium Battery Handling, Disposal, and First Aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Removal and Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . 3-20
Board Cleaning .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 20
Disposal . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Emergency andFirst Aid Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
A5 Fro nt Panel Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 3-23
Al7 Upper Right Front Pane l Assembly ....................................................... 3-24
Circuit Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Al Plug-In Interface Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
A4 Regulator Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 -3 1
A7 Touch Panel Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-32
AlO Fro nt P an el Interface Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35
All Main Processor Board . . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36
Al2 Vertical Amp Board ..................... . . .... .................... . . . ............. 3-39
Al3 Scope Logic Board .. . . . .. . .. . .. .. . . . .. . . . . . . . . . .. . . . .. . .. .. . .. .. . . •.. . . . . .. . . . . . . . . 3-42
Al4 Time Base Board ......................... . ..................... . .................. 3-46
Al5 Co u nterff im er Reference Board ............. . ................ . .. . .. .-. . . . . . . . . . . . . . . . 3-48
Al6 Memory Expansion Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-50
Rear Panel Pl ate Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 3-51
R80 CRT Termination Network and Distributed Capacitance Plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-53
Al8
De lay line Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-54
FRU IC Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . 3-55
"Slam-Pack" In tegrated Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-55
Firmware Integrat ed Circuits ("Dual In-Line Package" ICs) ................... . .............. 3-57
Prelilninary Verification Procedure ......... ... .. . ........... . ............. .. ....... . 3-57
Firmware Upgxade Procedure ........... .. ....... .. ........... . . . ................... 3-57
Restoring Factory Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-59
Cables and Connectors . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-60
Interconnecting Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . •. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-60
Coaxial-Type End-Lead Connectors (Peltolas) ........... .. ................. . ............. . . 3-60
Multi-Pin Connectors ............ .... ................ . . . ...... . ...... . .... .. ..... . ..... 3- 60
Implosion Shield Removal . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-63
FRU Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-64
Line Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-64
Circuit Board Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-64
Checks After FRU Replacement . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-65
CRT ......... . ................ . ...... . ............ .. ........... . .................. .. . 3-65
CRT Term ination Network . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-67
Distributed Capacitance Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-68
Al Plug-In Interface Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 3-69
A7 Touch Panel Board . . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-70
AlO Front Panel Interface Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-70
All Main Processor Board ..... . .................... . ................................... 3-71
Establishing a Set of Calibration Constants . .. . .. . .. . . . .. . . . .. . .. .. . .. . . . .. . .. .. . .. .. . 3-71
Method 1 . . . . . . . . . . . . . . . . . . .. .. . .. . . . . . . . . .. . . . . .. . . . .. . . . . . . . . .. . .. . . . .. . . . .. . . . 3-71
Method 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-72
Method 3 . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-73
Method 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-73
Readjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-73
11302A Service Reference

Contents
A12 Vertical
Amp Board . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-75
A13 Scope Logic Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . 3-76
A14
Tiine Base Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . 3-78
A15 Coun te rfl'imer Reference Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-79
T..-uubl.::sbuotiol! • • • • . • • . • • • • . • . . . . • • . • . . . . • •. • . • • • ••• • . • •• • . . . • • . •• . . • . • . • •. • • . • . . . . . . . . • . . . 3-80
Diagnostics Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-80
Level 0: Kernel Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 80
Level 1: Self-Test Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 80
Kernel Verification ................... . ..................... .. . .. . .... ........ .... 3- 81
Power- Up Mode . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . 3-81
Normal (
Non -Power -U p) Mode ......... . . ... ... .. . ... .... . ...... .. ... . ... .... . 3- 81
Instrument Verification .................................................... .. ...... 3- 81
Power-Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . .. . . . . . . . . 3-81
Normal (Non-Power-Up)
Mode ........................................ . ........ 3-81
Level
2: Extended Tests Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 83
Index Code Conventions . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-83
Fron t Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . 3-83
Test Menu Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-84
Test Menu Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-84
Block and Area Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 3-85
Routine Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-85
Analog and Digital Test Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-86
Mainframe Digital Test Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-86
Memory Test Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 3-8 7
Test S tatus Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . 3 -87
RS-232-C/GPIB . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . 3-88
System Mode (GPffi & RS-232-C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . 3-89
Test Commands . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 3-89
DiagnosticTerminal Mode (RS-232-C) . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 3-90
Terminal Interface ................ .... .. .. ................................... 3-90
Invocation Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-90
Terminal Diagnostic Commands . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . 3-90
New Configura ti on Calibration .. . . ... . . ............... . ......... ... .. . ... .. ...... .. ..... 3-91
Restoring Cah'bra
ti on Data From EEROM .............................................. .. 3-91
Procedure . . . •. . •. • .. . . . . . . •• . .. . . ••. •. . . . . . . . . . . . . . . . . . . . .. . .. . . . .. . . . . . . . . . . . . . 3 -9 1
Field Replaceable Unit
(FRU) Guide ......... . ......... .. ....... .... . . ................... 3-92
Abbreviations of FRU Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . 3-92
Abbreviations of Co mponent and Module Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-92
Extended Diagnostic Error Index Codes .. .. . .... . .. . .... . .. . . .. . . .. .. . .... . .. . .. . . . .. . . . .. 3-93
Enhanced Accuracy Mode Troubleshooting . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-94
Other Tro ubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-98
CRT ... . ... ..... .... ....... ...... .. ........................ . ... ..... . ... ........ . . . .. 3-98
Module Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-98
No Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-98
Display With No rntensity Control .......... .... ................. .. ................ . 3-101
Poor Writing Rate ........... . ........... . ..... ..... . ... ........ . ..... . .......... 3-101
Poor Y-Axis Alignment
...... . ........................................... . ........ 3-102
CRT Termination .. . ........ ..... ... .......... .. ............ .. ............... . .... .. .. 3-102
M
od ule Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3- 102
11302AService Reference v

Contents
DistnoutedCapacitance Plate ................................... . ..................... . 3-104
Module Troubleshooting ................................................... ...... . 3-104
Power Supply Module ............................................. . ...... .. .... . .. . .. . 3-105
Module Troubleshooting ................... ............... ....................... . 3-105
Regulator Board ..................................................................... . 3-106
Fuse Troubleshooting ..................................................................... . 3-107
Section 4- Theory of Operation
Block Diagram Description . .. .. . .. .. . .. . .. .. . . . . . . . . . . . .. . .. . . . .. . .. .. . . . .. . . . . . . . . . . . . . . . . . . 4-1
Al Plug-In Interlace Board ....... .. ...................................... . .... . ..... 4-1
AS, A8, and A9 Front Panel Assembly .. .. . .. . . . .. . . . . . . . . . . . . . . .. . . . .. . . . . . . . . .. . . . .. 4-1
A7 Touch Panel Board . . . . . . . . . . . . . . . .. . .. . .. . . . .. . . . . . . . . .. . . . . . . . . . . . . . . .. . . . .. . . 4-1
AlO Front Panel Interface Board .. .. . . . .. . . . . .. .. . . . .. . . . . .. .. . .. . . . .. . .. . . . .. . . . . . .. 4-3
All Main Processor Board .......... . ...... .. ..... . ................ ... .............. 4-3
Al2 Vertical Amp Board . ............. . ......... . .... . .. ........ . ........ . .......... 4-4
A13 Scope Logic Board . ....... ......... .. .............. . .... . ... . .................. 4 -5
Al4 Time Base Board .. . .. . .. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .. . . . .. . .. . .. .. . .. .. . . . . . 4-5
Al5 CounterTimer Referenc.e Board (Option 11) .. . .. . . . .. . . . .. . . . . . . .. . .. . . . .. . . . .. . . 4-6
A16 Memocy Expansion Board . . .. .. . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 4-6
Al7 CharacterCon tr ol Board ........... .. ..... . ....... . .... ......... ................ 4-6
Section 5- Replaceable Parts
Change Information
Related Documentation
The Parts List at the rear of this manual lists theTektronix part numbers for all
Standard and Optional Accessories provided
with this product.
Manuals (Stan dard Accessories)
vi
Introduction to the 11301A and 11302 A Counter Timer Oscilloscopes
11301A and 11302A CounterTimer Oscilloscopes Users Reference Manual
11301A and 11302A CounterTimer Oscilloscopes Pocket Reference
11301A and 11302AFunctional Test
Option
lR Rackmounting Instructions
11302A Servi ce Refer ence
.-....

List of Illustrations
Figure 2-1
Figure 2-2
Figure 2-3
Figure 2-4
Figure 2-5
Figure 2-6
Figure 2-7
Figure 2-8
Figure 2-9
Figure 2-10
Figure 2-11
Figure 2-12
Figure 2-13
Figure 2-14
Figure 2-15
Figure 2-16
Figure 2-17
Figure 2-19
Figure 2-20
Figure 2-21
Figure 2-22
Figure 2-23
Figure 2-24
Figure 2-25
Figure 2-26
Figure 2-27
Figure 2-28
Figure 2-29
Figure 2-30
Figure 2-31
Figure 2-32
Figure 2-33
Figure 2-34
Figure 3-1
Figure 3-2
Figure 3-3
Figure 3-4
Figure 3-5
Figure 3-6
Figure 3-7
Figure 3-8
Figure 3-9
Location
of DIP Switch on the All Main Processor board .. . ..................... . ..... 2-12
Location of the J90 connector on t. he All Main Processor board. . . . . . . . . . . . . . . . . . . . . . . . . 2- 15
Location
of J63-2, the +5.1 V test point on t he A2 Power Supply Module .......... . ..... 2-16
A2A2 Control Rectifier board test point and adjustment locations ....................... 2-18
A4 Regulator board test point and adjustment locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Locations of CRT touch areas to test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 2-23
AlO Front Panel Interface board (Touch Screen) test point and adjustment locations. . . . . . . 2-24
Waveform display showing Touch Screen adjustment wavefonns. . . . . . . . . . . . . . . . . . . . . . . . . 2-25
A13 Scope Logic board (CVR Accuracy) test point and adjustment locations .............. 2-28
All Main Processor board (AID Converter) adjustment locations. . . . . . . . . . . . . . . . . . . . . . . . 2-30
A14 Timebase board (ACVS Gain) test point locations ................................. 2-32
Al3 Scope Logic board (ACVS Gain) adjustment location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33
A13 Scope Logic board (Display Quality) adjustment location. . . . . .. . . . . . . . . . . . . . . . . . . . . 2-37
Trace separation measurement (0.2 div or less) on the displayed XY waveform. . . . . . . . .. . . 2-45
All Main Processor board (Stored Waveform Vectors) adjustment locations .............. 2-46
A12 Vertical board and Al4 Timebase board (Spot Shift) adjustment locations ............. 2-50
A12 Vertical board (Vertical Readout Jitter) adjustment location ........................ 2-52
A12 Vertical board (Vertical Center) adjustment and shorting locations. . ................ 2-56
Al4 Timebase board (Magnified Registration) adjustment location ....................... 2-58
An XY waveform display showing dimensions A. B, and C. The actual phase difference is
equal to sin-• (A+ B) ................................ .... .................... ... .. 2- 60
A14 Timebase board (XY Phase) adjustment location. . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . 2-61
A12 Vertical board adjustment and shorting locations .................................. 2-65
AlO Front Panel Interface board (Beam Registration) test point locatio ns ................. 2-70
CRT display showing the trace to graticule measurements for Beam Registration ........... 2-71
CRT display showing an acceptable GRAT _PREP waveform. .. . . . .. . . . . . . . . . . . .. . . . . . . . 2-72
A14 Timebase board (Reference Oscillator) adjustment location .............. . .......... 2-75
Location of the Option lT Oven Oscillator adjustment ................................. 2-77
AIO Front Panel Interface board (Calibrator) test point locations. . . . . . . . . . . . . . . . . . . . . . . . 2-80
Display showing proper alignment of rising edge to cursors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-83
Waveform alignment for the Linearity measurement (dimension A should be the same at
both ends). . .................................................................... 2-91
A14 Tirnebase board (High
Speed Linearity) adjustment location ........................ 2-92
A12 Vertical board (High Frequency Response) adjustment locations. . ................. 2-109
Video waveform ................................................................ 2-141
Field Replaceable Units
(FRU) Locator ............................................. 3-10
Rear panel locati on of screws securing the Power Supply Module ........ . ...... .... .. ... 3- 12
Bottom view of A2A2 Control Rectifier board showing connector locations. . . . . . . . . . . . . . . . 3-13
Rear view of CRT base-pin socket and inside view of the rear panel. . . . . . . . . . . . . . . . . . . . . . 3-16
Front Panel Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
Plug- in compartment showing mounting screws for the A1 Plug-In Interface board. . . . . . . . . 3-26
Connector a nd screw locations for the removal of the A4 Regulator board. . . . . . . . . . . . . . . . 3-27
The diagonal method to remove (and to reinstall) the retaining screws on the l1302A
CRT Scale Cover. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-32
Connec tor locations for removal of the A7 Touch Panel board (inside view). . . . . . . . . . . . . . . 3-34
11302A Service Reference vii

List of lllustrations
Figure 3-10
Figure 3-11
Figure 3-12
Figure 3-13
Figure 3-14
Figure 3-15
Fi gure 3-16
Figure 3-17
Figure 3-18
Figure 3-19
Figure 3-20
Figure 3-21
Figure 3-22
Figure 3-23
Figure 3-24
Figure 3-25
Figure 3-26
Figure 3-27
Figure 3-28
Figure 3-29
Figure 3-30
Figure 3-31
Figure 3-32
Figure
3-33
Figure 3-34
Figure 3-35
Figure 4-1
viii
Connector locationsfor rem oval of the A10 Front Panel Interfac.e board. . . . . . . . . . . . . . . . . . 3-35
Connector locations for removal of the All Main Processor board. . . . . . . . . . . . . . . . . . . . . . . 3-36
Removal of left side decora ti ve t rim covers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-39
Connector locations for removal of the A12 Vertical Amp board ........... .. ........... 3-40
Connector locatio ns for removal of the A13 Sc o pe Logic board. . . . . . . . . . . . . . . . . . . . . . . . . . 3-42
Connector locations for removal of the A14 Time Base board ................. . .... .. . . . 3-46
Connec to r locations for removal of the A15 Counter/rimer Reference board (option 1T). . . 3-48
Connector location f or removal of the A16 Memmy Expansion board. . . . . . . . . . . . . . . . . . . . 3-50
Locations of mounting screws on the rear panel plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-51
IC lead indexing diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . 3- 56
IC insertion-extraction pliers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-58
11302Acabling diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-61
Orientation
of multi-pin connector s. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-62
Block menu sample display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-84
Area menu sample display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . 3-84
Block and Area displayfields. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-85
Display of Analog Test menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-86
Display of a Plug-In Digital Test menu (plug-in diagnostics only). .. . . . . . . . . . . . . . . . . . . . . . . 3-86
Display of Mainframe Digital Test menu. . . .... . . . .. . .. . . . .. . .... . .. .. . . . . .... . .. . . .. 3-86
Display of Memory Test menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . 3-87
Test Status areas ofthe display. . . .. . ...... . .. . .... . .... .. . . .... . .. .. . .. . .... . .. . . .. 3-87
Enhanced Accuracy adjustment procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-96
Al3 Sco peLogicboard jump er, resistor, and fuse locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-100
CRT Termination ju mper location .............. . .................................. 3-103
Distnbuted Capacitance Plate. .. . .. . . . .. . .. .. . .... . .. . .... . .. .. . .. .. . . .. .. . . . .. . . . 3-105
Rear panel principal line fuse locati on . . .. . .... . .... .... .. .. . .. .. . .. .. . .. . .. .. . . . . . . 3-107
1130
2A System Block Diagram .. . .. . ..... . ............ . ............ .... ... ..... . .... 4-2
11302A Service Reference

List of Tables
Table 1-1
Table 1-2
Table 1-3
Table 2-1
Table 2-2
Table 2-3
Table 2-4
Tab le 2-5
Ta b le 2-6
Table 2 -7
Table 2-8
Table 3-1
Table 3-2
Table 3-3
Tab le 3-4
Table 3-5
Power-Cord Conductor Identification
... . .. .. ...... . ......... .. ....... .. ............. 1-2
Power-Cord and Pl ug Identification .......... . .... ... ....................... . ....... . 1-3
Option Information Locator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Adjustment Tests to Correct Main and Delayed SweepFailures . . . . . .. . . . . . . . . . . . . . . . . . . 2-88
11302A Vertical Gain . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . 2-99
Vertical Adjustments Required for Check Failures .
.. ................................ 2-106
Initial Adjustments for Critical Components
...... . .......... . ......•......... . ..... 2- 111
Vert ical Cursor To lerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -1 15
Measurement Tolerances ....................... . . .. ................ .. ..... . ..... 2- 115
Horizontal Tolerances . . . .. . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . 2-128
Relative Susceptibility to Damage From Static Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Power-up Ke rn el Fail ur e Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . 3-82
Extended (Ext)
Tests Diagnostics Erro r Index Codes ........ ...... .......... .... ...... 3-93
Enhanced Accuracy Adjustment Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-94
En han ced Accuracy Mode Error Messages and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 3-97
ll302A Service Reference
ix

Safety Summary
Terms
In This Manual
As Marked on
Equipment
Symbols
As Marked on
Equipment
Specific warnings and cautions will be found throughout the manual where they
apply, but may not
appear in this summary.
CAUTION statements identify conditions or practices that could result in damage
to the equipment or other property.
WARNING statementsidentify conditions or practices that could result in personal
injury
or loss of life.
CAUTION indicatesa personal injury hazard not immediately accessible as one
reads the marking, or a hazard to property including the equipment itself.
DANGER indicates a personal injury hazard immediately accessible as one re ads
the marking.
DANGER-High Voltage.
@ Protective ground ( earth }terminal.
& ATfENTION-refer to manual.
X 11302A Service Reference

Warnings
Power Source
Grounding
the Product
Danger Arising from
Loss of Ground
Do Not Operate
in Explosive
Atmospheres
Do Not Service Alone
Use Care When
Servicing with
Power On
Use the Proper Fuse
11302AService Reference
Safety Summary
This product
is intended to operate from a powersource that will not apply more
than 250 V
nns between the supply conductors or between either supply conductor
and ground. A protective ground connection,
by way of the grounding conductor in
the power cord, is essential for safe operation.
This product is grounded through the grounding conductor of the mainframe power
cord.
To avoid electric shock, plug the power cord into a properly wired receptac le
before connecting to the product input or output terminals. A protective-ground
connection, by
way of the grounding conductor in the power cord, is essential for
safe operation.
Upon loss of the protective-ground connection, aU accessible conductive parts (in-
cluding knobs and controls that may
appear to be insulating), can inflict an electric
shock.
To avoid explosion, do not operate this product in an atmosphere of explosive gas-
ses.
Do not perform internal service or adjustment of this product unless another per-
son capable
of rendering flrst aid and resuscitation is present.
Dangerous voltages exist
at several points in this product. To avoid personal injury,
do not touch exposed connections and components while power is on.
Disconnect power before removing protective panels, soldering,
or replacing com-
ponents.
Use care when handling a CRT. Breakage of the CRT causes a high-velocity scat-
tering of glass fragments (implosion). Protective clothing and safety glasses should
be worn. Avoid striking the CRT on anyobject which might cause it to crack or
implode. When storing a CRT, place it in a protective carton or set it face down in
a protected location on a smooth surface with a soft mat under
the faceplate.
To avoid fire hazard, use only the fuse specified in the parts list for your product,
and which is identical in type, voltage rating, and current rating.
xi

Section 1
General Information
Introduction
Thissection gives all the information needed to apply power to the 11302A
Counter Timer Oscilloscope.
Information on operating
vo ltage and power cord needs , as well as environmental
conditions such as operating
temperature and ventilation requirements, is included
here.
The 11302A Service Reference manual is designed for use by qualified service per-
sonnel. It contains information necessary to check, troubleshoot, and maintain the
11302A mainframe.Troubleshooting is primarily based upon internal diagnostics.
These diagnostics isolate probl ems to the FRU (Field Replaceable Unit) level. De-
fective FRUs no t detected by diag11ostics are isolated using ot h er means. Once the
faulty FRU isidentified, use the instructions provided in this manual to remove
and replace it. The removal and immediate replacement of the faulty FRU allows a
minimum
of downtime for the user. Section 5, Replaceable Parts, givesa complete
list
of the FRUs in this instrument.
Operating Power Information
This instrument can be operated from either a ll5 V or 230 V nominal supply
source, 48 to 440 Hz.
The 6 ampere, 250 V line fuse is used for bot h 115 V and
230 V operation.
WARNING I
AC POWER SOURCE AND CONNECTION. The oscilloscope oper·
atesfrom a single-phase power source. It has a
three-wire powercord
and two-pole, three-terminalgrounding-typeplug. The voltage to
ground (earth) from eitherpole of the power source must not exceed the
maximum rated operating voltage, 250 volts.
Before making connection to the power source, check that the oscillo-
scope
UNE VOLTAGE SELECTOR on the rear of the instrument is
set to match the
voltage of thepower source, and has a suitable two·
pole, three-terminal grounding-typeplug.
GROUNDING. This instrument issafety Class 1 equipment (IEC
des-
ignation). All accessible conductive parts are directly connected
through the grounding conductor of the power cord to the grounded
(earthing) contact of the power plug.
Generallnformation-11302A Service Reference 1-1

Power Cord
Information
Operating Voltage
1-2
IWARNING I
The power input plugmust be inserted only in a mating receptacle with
a grounding contact where earth ground Jws been verified by a qualified
service person. Do notdefeat the grounding connection. Any interrup-
tion of the grounding connection can create an electric shock hazard.
For electric shock protection, the groundingconnection must be made
before making connection to the instrument's input or output terminals.
A power cord with appropriate plug configuration is supplied with each instrument.
Ta ble 1-1 gives the color-coding of the conductors in the power cord. If you require
a powercord
other than the one supplied, refe r to Table 1- 2, Power-Cord and Plug
Identification.
TABLE 1·1
Po wer· C or d Co ndu ctor Ide nt ification
Co ndu cto r C ol or
Al te rn ate Co lor
Ungrounded (Une) Brown Black
Grounded (Neutral) Light Blue . White
Grounded (Earthing) GreenlY ellow Green
The liNE VOLTAGE SELECTOR (located on the rear panel) allows you to se-
lect 115 V or 230 V nominal line-voltage operation. The same line fuse is used for
both 115 V an d 230 V operation.
General Infonnation-11302A Service Refe rence

_,
TABLE 1·2
Power-Cord and Plug Identification
Plug Usage
Coofiguratioo
(Max Rating)
~
North American
125 V/6 A
~
European
220V/6A
~
United Kingdom
240 V/6A
~
Australian
240 V/6 A
~
North American
250 V/10 A
~
Switzerland
240 V/6A
'ANS I- Aimrican NUlioTUll Standards Jnstiluu
2NEMA- NarioTUll Electrical Manufacturer's Anocialion
3!EC-
lntemtUiOTUll Elearotechnical Commissicn
Reference
Standards &
Certification
1ANSI C73.11
2NEMA 5-15-P
3IEC 83
1oUL
11CSA
4CEE (7),II, IV, VII
3ffiC 83
8
VDE
9SEMKO
SBSI 13 63
3
IEC 83
8
AS Cll2
1
2ETSA
1ANSI C73.20
2NEMA6-15-P
3JEC 83
1o UL
11
CSA
7SEV
"GEE -Intemalional Commission on Ruks for the Approval of Electrical Equipment
&8S/- Britislo Standards lnstiluu
SAS -Stondards Association of Australia
7
SEV- Schwtizevischer Elelarotechischer Verein
0
VDE- Verband Deutscher E/e/arotechniku
8SEMKO -Swedish Institute for Testing and Approval of Electrical Equiprmnt
•OU L- Underwri~n Laboratories
' 'CSA -Canadian Standards Anoci4tion
12
ETSA- El~ctricity Trust of South Australia
Generallnformation-11302A Service Reference
Option I
Standard
Al
A2
A3
A4
A5
1-3

Memory Backup Power
A ba ttery (AllBT119 0) within the instrument allows the reten t ion of volatile mem-
ory
upon loss of the AC po wer source. This ba tt exy provides memory backup power
which
stores the last instrument set tings when the power is off. The s elf-te st will
display a message to indicate when the battery needs to be replaced.
Ano th er ba tt ery (A 16BT520) allows the retention of mainframe settings via the
STOREfRECALL men u of the mainframe. The battery maintains the storage buff-
ers whe n the power is off. The re is no diagnostic se lf -test coverage of A16BT520's
ch
arge level.
The batteries have a normal shelf life of approximately five years. Partial or total
loss of st ored settings u pon po wer -up may in dicate th at the battery(ies) needs to be
replaced.
Operating Environment
Operating
Temperature
Ventilation
Requireme~ts
1-4
The following environmental requirements are provided to ensure proper opera-
tion and long instrument life.
This instrument can be operated where the am b ient air temperature is between 0°
and +50° C an d can be sto re d in am bi ent tem p eratures f ro m -40° to +75° C.
After storage at temperatu r es outside the operating limits, allow the chassis to
reac h the safe operating te m perat ur e before applying power .
To preve nt d amage to the Counter Time r Oscilloscope from overheated compo-
ne nt s, ad equa te int ernal airflow must be maintained at all times. Before turning on
the power, c heck the air-intake ho l es for obstructions. Remove any obstructions to
air flow and provide both the bench and the rack mount models with a minimum of
two inches of clearance at the sides and rear. To maintain adequat e cooling, a vari-
able speed f an controls the air fl ow as tempera tur e varies.
If airflow is restricted, the instrument 's power supply may temporarily
shut down .
C1P.nP.ral Information -11302A Service Re f eren ce

.-
Instrument Options
List of Options
Option 1C
Option 1R
Option 1T
Option
A1
Opti on A2
Opti on A3
Option A4
Option A5
Your instrument may be equipped with one or more instrument options. A brief
description of each available option is givenm the following discussi on . Option in-
formation is incorporated into the appropriate sections of the manual. Refer to
Table 1-3 and the Table of Contents for location of option information. For f unher
information and prices of instrument options, see yourTektronix Products catalog
or contact yourTektronix Field Office.
Option lC adds four bnc connectors to the front and rear panels so that signals
may be internally routed directly between the two panels. This is especially useful
for rackmounted applications. This op tion can be added at any time.
Option lR adds slide rails and rackmounting hardware to convert the benchtop
instrument to a standard 19-inch rackmount version. Thisopti on can be added at
anytime .
Option lT provides a high-stability timebase for the Counter Timer. This option
can be added at any time.
Replaces the standard power cord with the Universal European 220 V type power
cord.
Replaces the standard power cord with the United Kingdom 240 V type power
cord.
Replaces the standard power cord with the Australian 240 V type power cord.
Replaces the standard power cord with the North American 250 V type power
cord.
Replaces the standard power cord with the Switzerland 240 V type powercord.
General Infonnation -11302A Service Reference 1-S

TABLE 1·3
Option Information Locator
Location in Manual
Option Section Heading Information
Option 1C (Provides 1 Gives brief description
back
to front connectors) General Infonnation List of Options
of Option 1C.
Option lR (Provides 1 Gives brief description
rackmount hardware) General Information List
of Options of Option lR.
Option 1T 1 Gives brief description
General Infonnation List of Options
of Option 1T.
Option Al (Provides 1 Table 1-2, Power-Cord Gives plug configurations
Universal
European
General Information and Plug Identification ratings and referenced
power cord) standards.
List of Options Gives brief description
of Option
Al.
Option A2 (Provides 1 Table 1-2, Power-Cord Gives plug configurations
United Kingdom General Information and Plug Identification ratings and referenced
power cord) standards.
List of Options Gives brief description
of Option A2.
Option A3 (Provides 1
Table 1-2, Power-Cord Gives plug configurations
Australian General Information
and Plug Identification ratings and referenced
power cord) standards.
List
of Options Gives brief description
of Option A3 .
Option A4 (Provides 1 Table 1-2, Power-Cord Gives plug configurations
North American General Information and Plug Identification ratings and referenced
power cord) standards.
List of
Opt ions Gives brief description
of Option A4.
Option A5 (Provides 1 Table 1-2, Power-Cord Gives plug configurations
Switzerland General Information and Plug Identification ratings and referenced
power cord) standards.
List of Options Gives brief description
of Option A5.
1-6
r. ..n.eral Information -11302A Service Reference

Section 2
Checks and Adjustments
This section contains procedures to check electrical specifications, verify most
instrument functions, and set all internal adjustments. This procedure provides a
logical sequ
ence of check and adjustment steps, and is intended to re t urn the
instrument to specified operation following repair, or as a part of a routine
maintenance program.
The procedure is semi-automated, relying on computer
aided test system (CATS) software running on
an IBM compatible personal
computer(PC) to control the mainframe.
The Checks and Adjustments procedure
contains
manual and automated tests. The written procedure directsyou to run
CATS tests when necessary. The CATS software displays the tests in alphabetical
order,
not in the order in which they will be run. The PC controls the mainframe
under test via the COMl RS-232 port.
Consult
the User's Reference manual for more information about advertised
specifications and instrument operation. Consult the test equipment manuals for
information concerning test equipment setup or interconnection. The specifications
are given at the beginning of each procedure that verifies a performance
specification.
NOTE
Performance specifications are used in the checkportions of this
procedure
while tighter adjustment specifications are usedin the
adjustment portions to ensure that theadvertised instrument
performance is met
in allnormal operating conditions.
Installing and Removing Plug-In Units
To avoid instrument dQJ'I'Ulge. set the mainframe ON/STANDBY
switch to STANDBY before installing or removingplug-in units.
Minimize the Time Power is Off
During the procedureyou will be asked to change plug-in units and install or
remove the top and bottom covers. Both of these tasks require a power-down with
the ON/STANDBY switch. You should try to keep
the power-off time to a
minimum in order to reduce the internal temperatu re change. The mainframe
accuracy isadversely affected by internal changes in temperature. In normal
operation, Enhanced Accuracy is available only
after a 20 minute warmup period.
This requirement isdefeated during the procedure to accelerate the execution
time,
but care should be taken to minimize the power-off time.
Cheeks and Adjustments-l l302AService Reference 2-1