Tektronix TAS 455 User manual

Service Manual
TAS 455 & TAS 465
Analog Oscilloscopes
B020099 and Below
070-8524-02
Warning
The servicing 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 service.

  
"$) *.3425-&.4 -".5'"$452&% #9 &+42/.*8 )"3 " 3&2*", .5-#&2 /. " 0".&, *.3&24 /2 4"( /2 34"-0&% /. 4)&
$)"33*3 )& '*234 ,&44&2 *. 4)& 3&2*", .5-#&2 %&3*(."4&3 4)& $/5.429 /' -".5'"$452& )& ,"34 '*6& %*(*43 /' 4)&
3&2*", .5-#&2 "2& "33*(.&% 3&15&.4*",,9 ".% "2& 5.*15& 4/ &"$) *.3425-&.4 )/3& -".5'"$452&% *. 4)&
.*4&% 4"4&3 )"6& 3*8 5.*15& %*(*43 )& $/5.429 /' -".5'"$452& *3 *%&.4*'*&% "3 '/,,/73
 &+42/.*8 .$ &"6&24/. 2&(/. 
 &+42/.*8 .*4&% *.(%/- 4% /.%/.
 /.9&+42/.*8 "0".
 &+42/.*8 /,,".%   &&2&.6&&. )& &4)&2,".%3
.3425-&.43 -".5'"$452&% '/2 &+42/.*8 #9 &84&2.", 6&.%/23 /543*%& 4)& .*4&% 4"4&3 "2& "33*(.&% " 47/ %*(*4
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&+42/.*8 .$  /8  &"6&24/.  
2*.4&% *. 
/092*()4 &+42/.*8 .$ ,, 2*()43 2&3&26&% &+42/.*8 02/%5$43 "2& $/6&2&% #9  ".% '/2&*(.
0"4&.43 *335&% ".% 0&.%*.( )& '/,,/7*.( "2& 2&(*34&2&% 42"%&-"2+3 !   ".%
:

WARRANTY
!                    " 
     "       "  !      
               !    
       "   " !      !   "
                
         " !     ! 
"                  "    ! 
        "     !  "   
   "  
 "   "  "      "       
  !          "        "
   !              
                   
              "    
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER
WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX' RESPONSIBILITY TO REPAIR OR
REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR
BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

TAS 455 and TAS 465 Service Manual 
Ta le of Contents
List of Figures vii...............................................
List of Ta les xi................................................
Safety Summary xiii.............................................
Sym ols and Terms xiii......................................
Specific Precautions xiv.....................................
Preface xvii.....................................................
Related Manuals xviii.........................................
Specifications
Product Description 1Ć1.........................................
User Interface 1Ć2...........................................
  
  
      
   
Vertical System 1Ć3..........................................
Horizontal System 1Ć3.......................................
Trigger System 1Ć3..........................................
Measurement Cursors 1Ć3....................................
Nominal Traits 1Ć5...............................................
Warranted Characteristics 1Ć9...................................
Performance Conditions 1Ć9..................................
Typical Characteristics 1Ć17.......................................
Operation
Installation and Power On 2Ć1....................................
Quick Start 2Ć3..................................................
Selecting and Deselecting Input Channels 2Ć3.................
Using the Menus 2Ć3.........................................
Connecting a Signal 2Ć4.....................................
Using AUTOSET 2Ć4.........................................
Compensating the Pro e 2Ć5.................................
Menu Map 2Ć8...............................................

Table of Contents
Contents

Theory of Operat on
C rcu t Descr pt on 3Ć1..........................................
Log c Convent ons 3Ć1.......................................
Module Interconnect on 3Ć1..................................
Analog Board 3Ć4............................................
..!(/.),-  5
,)! ) %(# (.!,"!  5
(&)# +/%-%.%)( 3,%  5
2.!,(& ,%##!,  5
Processor System 3Ć4.......................................
,)!--), /-3-.!'  5
 /-3-.!'  5
! )/. /-3-.!'  5
,)(.5(!& (.!,"! /-3-.!'  5
(&)# ), (.!,"! /-3-.!'  5
D splay Assembly 3Ć6........................................
!,.%& /.*/.  5
),%4)(.& /.*/.  5
%#$ )&.#!  5
Front Panel 3Ć6..............................................
!(/ 1%.$!-  5
  5
 ).- ( ,)!-  5
- ( ,%0!,  5
1%.$!-  5
Power Supply 3Ć8...........................................
Fan 3Ć8.....................................................
Performance Ver f cat on
General Instruct ons 4Ć1.........................................
Us ng the Br ef Performance Checks Procedures 4Ć1...........
Us ng the Performance Tests Procedures 4Ć1..................
Convent ons 4Ć2.............................................
Br ef Performance Checks 4Ć3...................................
PowerĆOn Self Tests 4Ć3......................................
Funct onal Tests 4Ć3.........................................
/(.%)(& !-.- ,!,!+/%-%.!- 5
!,%"3 .$! ,)! )'*!(-.), /.*/. 5
!,%"3 .$! (*/. $((!&- 5
!,%"3 .$! &.$)* (  /(.%)(- 5
!,%"3 .$! %'! -! 5
!,%"3 .$! ,%##!, 3-.!' 5
!,%"3 .$! 2.!,(& ,%##!, 5

Tab e of Contents
TAS 455 and TAS 465 Service Manua 
Temperature Compensation Ca ibrations 4Ć9..................
Horizontal Sweep Path 4Ć9.................................
Vertical Signal Path 4Ć11....................................
Performance Tests 4Ć13...........................................
Performance Tests Prerequisites 4Ć13..........................
Equipment Required 4Ć13.....................................
Vertica System Checks 4Ć15..................................
Check DC Gain and Voltage Measurement Accuracy 4Ć15......
Check Trigger Level Accuracy 4Ć16..........................
Check DC Coupling Bandwidth 4Ć17.........................
Check ĆAxis Gain 4Ć19.....................................
Horizonta System Checks 4Ć19................................
Check Time Base and Time Cursor Accuracy 4Ć19.............
Check Dual Delay Accuracy 4Ć22............................
Trigger System Checks 4Ć24...................................
Check Trigger Sensitivity 4Ć24...............................
Video Trigger Sensitivity 4Ć28................................
Adjustment
Adjustment Procedures 5Ć1......................................
Requirements for Performance 5Ć1...........................
Personnel 5Ć1............................................
Access to Adjustments 5Ć1.................................
WarmĆUp Period 5Ć1......................................
Equipment Required 5Ć2.....................................
Performing the Adjustment Procedures 5Ć2....................
Complete Adjustment 5Ć3..................................
Partial Adjustment 5Ć3.....................................
Adjustment Dependencies 5Ć3.............................
Adjustment Instructions 5Ć4..................................
Power Supply Adjustment
(New Style Power Supply) 5Ć4..........................
CRT Adjustments 5Ć4.....................................
Low Frequency Output Compensation 5Ć6...................
Factory Horizontal Cal 5Ć7.................................
Factory Vertical Cal 5Ć11....................................
High Frequency Step Response 5Ć14.........................
Attenuator Compensation 5Ć16..............................
Vertical Gain Adjust (Cabinet On) 5Ć17........................

Ta le of Contents
Contents
iv
Maintenance
Maintenance Information 6Ć1.....................................
Before Servicing 6Ć1.........................................
Tektronix Service 6Ć1........................................
,,).3 ",0& " 4
"+&, *, '&,.&*) ",0& " 4
Self Service 6Ć2.............................................
Preventing ESD 6Ć2..........................................
Inspection and Cleaning 6Ć5.....................................
General Care 6Ć5............................................
Inspection and Cleaning Procedures 6Ć5......................
)-+" .&*) 5 2.",&*, 4
'")&)$ ,* "!/," 5 2.",&*, 4
'")&)$ ,* "!/," 5 ).",&*, 4
'")&)$ .%"  (+'*-&*) %&"'! 4
Removal and Installation Procedures 6Ć9.........................
Preparation Ċ Please Read 6Ć9...............................
'" "(*0' 4
")",' )-.,/ .&*)- 4
/((,3 *# ,* "!/,"- 4
Line Cord and Line Fuse 6Ć14.................................
&)" *,! 4
&)" /-" 4
FrontĆPanel Kno s and Shafts 6Ć15............................
"(*0&)$ ,*).4)"' )*- )! %#.- 4
)-.''&)$ ,*).4)"' )*- )! %#.- 4
Feet, Rear Cover, and Ca inet 6Ć17............................
", *0", 4
&)". 4
"+' &)$ .%" ,*). "". 4
FrontĆPanel Trim, Menu and Power Buttons 6Ć18................
"(*0&)$ .%" ,*). ,&( 4
")/ /..*)- )! '-.*(", 4
*1", /..*) "+' "("). 4
)-.''&)$ .%" ,*). ,&( 4
A62 Front Panel Module Removal 6Ć20.........................
,*).4)"' *!/'" &---"('3--"('3 4
Menu Flex Circuit Replacement 6Ć23...........................
A1 Analog Board 6Ć24.........................................
Display Driver Board (A3) 6Ć26................................
CRT Implosion Shield 6Ć27....................................
Fan and Fan Mount 6Ć29......................................
) )! ) */). "(*0' 4
) )! ) */). )-.''.&*) 4

Tabl of Cont nts
TAS 455 and TAS 465 S rvic Manual v
CRT 6Ć31.....................................................
 #%+" .
 $()"") %$ .
CRT Light Guid 6Ć34.........................................
CRT Front Brack t 6Ć35.......................................
A2 Display Control Board 6Ć36.................................
A63 Pow r Supply Modul 6Ć37................................
%,' *&&"- #%+" .
%,' *&&"- $()"") %$ .
Troubl shooting 6Ć41.............................................
Troubl shooting Proc dur 6Ć41...............................
Equipm nt 6Ć41..............................................
Symptom Matrix 6Ć42.........................................
R packaging Information 6Ć51....................................
Options
&) %$(  $)'$) %$" %,' %'( .
''$)-."*( '+  &) %$( .
&) %$  !#%*$) .
&) %$  '%$) %+' $ %* .
&) %$   ) %$" '%( .
&) %$  ')  ) % " ') %$ $ () ) &%') .
R plac abl El ctrical Parts List
Diagrams
Diagrams and Circuit Board Illustrations 9Ć1......................
Symbols 9Ć1................................................
Compon nt Valu s 9Ć1.......................................
Graphic It ms and Sp cial Symbols Us d in This Manual 9Ć1...
Compon nt Locator Diagrams 9Ć2............................
R plac abl M chanical Parts List

  

vi