Tektronix 308 User manual

lIIIIlI
n
COMMITTEDTO EXCELLENCE
WARNING
THE FOLLOWING SERVICING INSTRUCTIONS
ARE FOR USE BYQUALlFIEO PERSONNELONLY.
TO AVOIO PERSONAL INJURY, DO NOT
PER FORM ANY SERVICING OTHER THAN THAT
CONTAINED IN OPERATING INSTRUCTIONS
UNLESS YOU ARE QUALlFIEO TO DO SO.
INSTRUCTION MANUAL
Tektronix, Inc.
P.O.
Box 500
Beaverton,
Oregon 97077
070-2662-00
Serial Number _
First Printing aCT 1979

TABLE Fe
308 Service
TENTS
SECTION 1 INTRODUCTION AND
SPECIFICATION
INTRODUCTION
........
1-1
SPECIFICATION
........ 1-2
SECTION 2OPERATING
INSTRUCTIONS
INSTALLATION ......... 2-1
Power Requirements .... 2-1
Power Cord .......... 2-1
CONTROLS, CONNECTORS,
AND
INDICATORS ....... 2-2
Acquisition Controis .... 2-2
Instrument and Display SECTION 4
Mode Controis ........ 2-4
Entry
Controls ........ 2-5
Signature Controls .....
2-6
Input Controls and
Connectors .......... 2-6
OPERATORS
CHECKOUT
PROCEDURE ...........
2-9
I
ntroduction .......... 2-9
Diagnostics
.......... 2-9
OPERATORS
FAMILlARIZATION ....... 2-10
The
Controi Function
Access Chart
......... 2-10
The Next State Table
...
2-10
Basic Operating
Information .......... 2-10
Typical Application
..... 2-19
Page
LIST OF ILLUSTRATIONS ii
LIST OF TABLES iv
OPERATOR'S SAFETY SUMMARY v
SERVICE SAFETY SUMMARY vii
@
SECTION 3THEORY OF OPERATION Page
INTRODUCTION 3-1
SYSTEM ARCHITECTURE. 3-1
GENERAL SYSTEM
DESCRIPTION 3-4
DETAILED
CIRCUIT
DESCRIPTION 3-7
ParalIei Data
Input {i;> 3-7
Word Recognizer 03-11
ParalIei
Acquisition
Memory and Trigger
Delay <2> 3-15
Time Base 03-19
Serial/Signature
Input 0' 3-19
SignatureGenerator 03-22
Serial Data
Acquisition {f> 3-25
Keyboard 0and
MPU
-0 3-29
Display Controi 0 .. 3-31
CRT
~ 3-34
Power Supply
<{P 3-37
CALlBRATION
PERFORMANCE CHECK 4-3
Power-on Diagnostics .
.. 4-4
Operator-Initiated
Diagnostics ........
.. 4-4
Threshold Voltages
.... ,4-7
Minimum Externai Clock
Period ,4-8
Minimum Sample Interval
and
Minimum Data Pulse
Width 4-10
Word Recognizer
Filter.. 4-12
Minimum Word Recognizer
Pulse Width . . . . . . . .
.. 4-14
Trigger Delay Counter .. 4-16
Signature Acquisition .
.. 4-19
Serial Acquisition .... .. 4-20

308 Service
TABLE
F CONTENTS (cont)
SECTION 4CALlBRATION (cont) Page SECTION 5 MAINTENANCE (cont) Page
:%'
ADJUSTMENT PROCEDURE4-23 CORRECTIVE
Power Supplies
.......
4-24
MAINTENANCE .........
5-11
CRT Circuit ..........
4-25
Obtaining Replacement
Clock Delay ..........
4-26
Parts: ..............
5-11
Externai
Trigger Delay 4-29
Soldering Techniques ...
5-11
..
DC Balance and Bias ... 4-31 Removal and Replacement
Input Capacitance
4-32 I
nstructions ..........
5-12
.....
Signature Data Delay ... 4-35 Recalibration
.........
5-20
Instrument Repackaging .5-21
SECTION 5
MAINTENANCE
STATIC SENSITIVE
SECTION 6
OPTIONS
COMPONENTS .........
5-1
PREVENTIVE
SECTION 7
REPlACEABlE
MAINTENANCE .........
5-2
ElECTRICAl PARTS
Cleaning ............
5-2
Inspection ...........
5-2
SECTION 8DIAGRAMS
TROUBLESHOOTING
.... 5-4
SECTION 9
REPlACEABlE
Troubleshooting Aids ...
5-4
MECHANICAl PARTS
Troubleshooting
Equipment ...........
5-6 ACCESSORIES
Troubleshooti ng
Techniques .......... 5-9 CHANGE INFORMATION
LIST
F ILLUSTRATIONS
Figure
No. Page Figure
No. Page
308 dimensional drawing . . . . . . . . . .. 1-13
Location of the Ii ne-voltage i ndicator .. 2-1
Connecting the power cord. ...... .. 2-1
Optional power cords for the 308 "2-2
Acquisition controls and i ndicators 2-3
Instrument and display mode controls 2-4
Entry controls 2-5
Signature controls 2-6
Right side panel controls and connectors 2-7
1-1
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
ii
308 Data Analyzer
viii 2-9
2-10
2-11
2-12
2-13
2-14
2-15
2-16
2-17
Data
transition s, filter adjustment, and
triggering 2-8
Next state
table 2-11
Basic 308
acquisition and display system 2-11
Positive
logic with number assignments to
voltage inputs 2-12
ParalIei
acquisition menu 2-14
Serial
acquisition menu 2-14
Typical signature data sequences 2-18
Data
to signature sequence . . . . . . . .. 2-19
Test
schematic for the 308 application
example 2-20
@

LIST
F ILLUSTRATIONS (cont)
308 Service
Figure
No.
3-1
3-2
3-3
3-4
3-5
3-6
3-8
3-10
3-11
3-12
3-13
3-14
3-15
3-16
7
8
3-19
3-20
3-21
8-22
3-23
3-24
3-25
3-26
3-27
3-28
Example
of block-structured routines in
the 308 .
Memory allocation map for the 308 .
Simplified diagram of the 308 .
Simplified diagram of the paralIei data
input circuit .
Equivalent
circuit of one channel of the
P6451 data acquisition probe .
Simplified diagram for one channel of the
sample/latch stage .
Simplified timing diagram of sample/latch
stage .
Simplified diagram of the word recognizer
circuit .
Async filter timing diagram .
Simplified diagram of the paralIei
acquisition memory and trigger delay
circuits .
Simplified timing diagram for data
acquisition sequence .
Simplified diagram of the time base circuit
Simplified diagram of the serial/signature
input, signature generator, and serial data
acquisition circuits .
Simplified diagram of the variable delay
circuit and its timing .
Timing diagram of the gating logic stage
Simplified diagram of the CRC generator
stage .
Asynchronous mode instruction format
Synchronous mode instruction format
Status i nformation format .
Typical data
block for a USART .
USART
command instruction format ..
Simplified diagram of the MPU and key
board
circuits .
Simplified diagram of the display controi
circuit .
Timing diagram of the display timing
generator stages .
Simplified diagram of the CRT circuit ..
Simplified diagram and waveforms of the
horizontal sweep generator .
Simplified diagram of the power supply
circuit .
Representation
of inverter stage and
idealized waveforms .
Page
3-2
3-3
3-5
3-8
3-9
3-9
3-10
3-12
3-14
3-16
3-17
3-20
3-21
3-23
3-24
3-26
3-27
3-27
3-28
3-28
3-29
3-30
3-32
3-33
3-35
3-36
3-38
3-40
Figure
No.
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9A
4-98
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10
5-11
Page
Diagnostic 0keyboard code 4-5
Diagnostic test setup 4-6
Test
setupfor checking minimum external
clock period. ................. .. 4-8
Test waveform
for minimum externai
clock period. ................. .. 4-9
Test waveforms
for minimum sample
interval and
minimum data pulse width. 4-11
Test waveforms
for word recognizer filter 4-13
Test waveforms
for minimum word
recognizer pulse width .......... .. 4-15
Test setup
for trigger delay counter . .. 4-17
Adjusting pulse generators outputs for
trigger delay counter check 4-18
Adjusting pulse generators outputs for
checking clock qualifiers 4-18
Adjusting pulse generator outputs for
signature acquisition check. ...... .. 4-19
Test setup
for serial acquisition check 4-22
Test setup
for adjusting clock delay and
signature data delay ,4-27
Test waveforms
for clock delay
adjustment, externai trigger, and
signature data delay ............ .. 4-28
Test setup
for adjusting externai trigger
delay. . . . . . . . . . . . . . . . . . . . . . . .. 4-30
Test
setupfor adjusting input capacitance 4-33
Test waveforms
for adjusting input
capacitance .................. .. 4-34
Test setup
for adjusting signature data
delay. ...................... .. 4-36
Diagnostic 5reference pattern ..... .. 5-4
Circuit board locations .......... .. 5-5
Color code for resistors and capacitors 5-7
Semiconductor lead configurations ... 5-8
Multi-connector holder orientation . . .. 5-9
Keyboard removal 5-13
Side panel and
circuit board removal 5-14
308
top view 5-15
Power
switch actuation linkage 5-16
CRT
circuit board removal details 5-17
Pin
connector replacement . . . . . . . .. 5-21
REV AAPR 1980
iii

308 Service
LIST FILLUSTRATI S (cont)
Figure
No.
8-1
8-2
8-3
8-4
8-5
8-6
8-7
8-8
8-9
NOTE
The following illustrations appear
in the Diagrams
foldout section.
Semiconductor lead configurations
A1Data
input boardcomponentlocations
A2
Trigger board component locations
A3 Serial &signature data acquisition
board component locations
A5 Key board component locations
A4 MPU board component locations
A6
CRT board component locations
A7 Primary power
supply board
component locations
A8 Secondary power
supply board
component locations
Figure
No.
8-10
8-11
8-12
8-13
8-14
8-15
8-17
A1 Data input board test point and
adjustment locations
A2 Trigger board test point and
adjustment locations
A3 Serial &signature data
acquisition
board test point and adjustment locations
A4 MPU board test point and adjustment
locations
A6 CRT board test point and adjustment
locations
A8 Secondary power supply board test
point and adjustment locations
Controi Function Access Chart
LIST FTABLES NOTE
Table Table Thefollowingtables appear
in the Diagramsfoldout
No. Page No. section.
1-1
Electrical Characteristics ........... 1-2
8-1 Troubleshooting Tree to Signature List
1-2 Environmental Characteristics
....... 1-12 Cross-Reference
1-3 Physical Characteristics .............
""" ..
1-13 8-2 Device Error List
8-3 308 Power-Up Diagnostic Errors
2-1
Power-up Error Codes
.................. " .... 2-9 8-4 Signature List and Setup Conditions for
2-2 ParalIei and Serial Acquisition Parameters 2-13 ROM Check
2-3 Signature List
.................................... 2-21
8-5 Signature List and Setup
Conditions for
Kernel Check
3-1
Truth Table for Setting Parameters 8-6 Signature List and Setup
Conditions for
... 3-11
Chip Select Test
3-2
Truth Table for the Clock Gate ...... ".... 3-18 8-7 Signature List and Setup
Conditions for
3-3 Sample Interval Selection
.................... 3-19
Chip Select Test (Write Only)
3-4 Programmable Bit-Rate Generator 8-8 Signature List and Setup
Conditions for
Outputs .......................
3-25 Address
Counter
3-5 Data Bus Buffer Controi
...........
3-27 8-9 Signature List and Setup
Conditions for
3-6 USART Read/Write Contral
Logic
........ 3-29 Delay Counter
8-10 Signature List and Setup
Conditions for
4-1
Test Equipment Required ..........
4-1
Data Paths
4-2 Serial Acquisition Data
............
4-21
8-11 Signature List and Setup Conditions for
4-3 Power Supply Tolerances
..........
4-24 Display
Column Counter
8-12 Signature List and Setup Conditions for
Display Row-Line Counter
5-1
Relative Susceptibilityto StaticDischarge 8-13 Signature List and Setup
Conditions for
Damage .......................
5-1
Display Character Row Counter
5-2 Externai Inspection Checklist
..............
5-3 8-14 Baud Rate Test
One
5-3
Intemal Inspection Checklist .•...... 5-3 8-15 Baud Rate Test
Two
REV AAPR 1980

@
308 Service
OP RATORS SAFETY SUMMARY
The general safety i nformation in this part of the summary is for both operating and servici ng
personnel. Specific warnings and cautions will be found throughout the manual where they
apply and do not appear in this summary.
TERMS
In This Manual
CAUTION statements identify conditions or practices that could result in damage to the
equipment or other property.
WARNING statements identify conditions or practices that could result in personal injury or
loss of life.
As
Marked on Equipment
CAUTION indicates apersonal injury hazard not immediately accessible as one reads the
marking, or ahazard to propert y inciuding the equipment itself.
DANGER indicates apersonal injury hazard immediately accessibleas one reads the marking.
SYMBOLS
As Marked on Equipment
~ DANGER - High voltage.
@Protective ground (earth) terminal.
Power
Source
This product is intendedto operatefrom a power sourcethat will not apply morethan 250volts
rms 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
essentiai for safe operation.
v

308 Service
Grounding the Product
This product is grounded through the grounding conductor of the power cord. To avoid
electrical shock, piug the power cord i nto a properly wired receptacle betore connecti ng tothe
product input or output terminals. A protective ground connection by way of the grounding
conductor in the power cord is essentiai for sate operation.
Danger Arising From Loss of Ground
Upon loss ot the protective-ground connection, all accessible conductive parts (including
knobs and controls that may appear to be insulating) can render an electric shock.
Use
the Proper Power Cord
Use only the power cord and connector specified for your product.
Use
only a power cord that is in good condition.
For detailed information on power cords and connectors, see Section 2 ot the manual.
Refer
cord and connector changes to qualitied service personnel.
Use
the Proper Fuse
To avoid fire hazard, use only the fuse of correct type, voltage rating and current rating as
specified in the parts list for your product.
Reter tuse replacement to qualitied service personnel.
Do Not Operate in Explosive Atmospheres
To avoid explosion, do not operatethis product in an explosive atmosphere uniessit has been
specifically certitied for such operation.
Do Not Remove Covers or Panels
To avoid personal injury, do not remove the product covers or panels. Do not operate the
product without the covers and panels properly installed.
vi @

@
308 Service
SERVICING SAFETY SUMMARY
FOR QUAL/F/ED SERVICE PERSONNEL ONL y
Refer a/so to the preceding Operators Safety Summary.
Do Not Service Alone
Do not perform internai service or adjustment of this product uniessanother person capable of
rendering first aid and resuscitation is present.
Use Care When Servicing With Power On
Dangerous voltages exist at severalpoints 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 components.
Power Source
This product is intended to operatefrom a power sourcethat will not apply morethan 250volts
rms 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
essentiai for safe operation.
vii

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2662-33
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The 308 Data Analyzer.
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