Tektronix TDS 520A User manual

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Service Manual
TDS 520A, 524A, 540A, & 544A
Digitizing Oscilloscope
070–8713–03
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&(/. 
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 /.9&+42/.*8 "0".
 &+42/.*8 /,,".%   &&2&.6&&. )& &4)&2,".%3
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2*.4&% *. 
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:

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.

TDS 520A, 524A, 540A, & 544A Service Manual i
Ta le of Contents
Safety Summary xiii.............................................
Specifications
Specifications 1Ć1...............................................
General Product Description 1Ć1..............................
User Interface 1Ć2...........................................
 &$ '
 %!#$ '
 # &#"!$  ! '
 '
Signal Acquisition System 1Ć3................................
Horizontal System 1Ć4.......................................
Trigger System 1Ć5..........................................
Acquisition Control 1Ć6......................................
OnĆBoard User Assistance 1Ć6...............................
" '
&%!$% '
Measurement Assistance 1Ć6.................................
&#$!# '
$&# '
%   #!$$   '
Storage and I/O 1Ć7..........................................
Display 1Ć8..................................................
!! '
Nominal Traits 1Ć9...............................................
Warranted Characteristics 1Ć15...................................
Typical Characteristics 1Ć21.......................................

Table of Contents
Contents
ii
Operatin Information
Usin This Manual 2Ć1...........................................
Before Servicin 2Ć1.........................................
Strate y for Servicin 2Ć1....................................
Manual Structure 2Ć2........................................
Manual Conventions 2Ć3.....................................
%+") 0
*/ 0
/#%") 0
Tektronix Service 2Ć4........................................
(($*/ & ( (,  0
& ( %( " (* %$ (,  0
" (,  0
Findin Other Information 2Ć5................................
General Information 2Ć7.........................................
Supplyin Operatin Power 2Ć7...............................
%-( %( $%(#* %$ 0
&(* $ %"* 0
#%(/ !+& %-( 0
Operatin Environment 2Ć10...................................
&(* $ #&(*+( 0
$* "* %$ '+ (#$*) 0
Applyin and Interruptin Power 2Ć11..........................
%-( $ 0
%-(  0
Repacka in Instructions 2Ć12................................
Installed Options 2Ć12........................................
General Operatin Instructions 2Ć13...............................
Screen Layout 2Ć13...........................................
Basic Procedures 2Ć13........................................
%- *% %-( $ 0
%- *% ) "& 0
%- *% ) * **+) $+ 0
%- *% * +$* %$) 0
%- *% * %#&". +$* %$) 0
Theory of Operation
Circuit Description 3Ć1..........................................
Lo ic Conventions 3Ć1.......................................
Module Overview 3Ć1........................................

Tabl of Cont nts
TDS 520A, 524A, 540A, & 544A S rvic Manual iii
P rformanc V rification
Bri f Proc dur s 4Ć1............................................
G n ral Instructions 4Ć1.....................................
Conv ntions 4Ć2.............................................
S lf T sts 4Ć4...............................................
'4+(: 06'40#. &,756/'06 '.( 1/2'05#6+10 #0&
+#)0156+%5 <
Functional T sts 4Ć6.........................................
'4+(: .. 0276 *#00'.5 <
'4+(: 6*' +/' #5' <
'4+(: 6*' #+0 #0& '.#:'& 4+))'4 :56'/5 <
'4+(: 6*' +.' :56'/ 26+10#. 10   #0&  <
P rformanc T sts 4Ć15...........................................
4'4'37+5+6'5 <
37+2/'06 '37+4'& <
'56 '%14& <
Signal Acquisition Syst m Ch cks 4Ć23........................
*'%- %%74#%: 1( ((5'6 "'41 '66+0) <
*'%-  #+0 #0& 1.6#)' '#574'/'06 %%74#%: <
*'%- 0#.1) #0&9+&6* <
*'%- '.#: '69''0 *#00'.5 <
Tim Bas Syst m Ch cks 4Ć39...............................
*'%- %%74#%: (14 10)<'4/ #/2.' #6' '.#: +/'
#0& '.6# +/' '#574'/'065 <
Trigg r Syst m Ch cks 4Ć42...................................
*'%- %%74#%: +/' (14 7.5'<.+6%* 14 7.5'<!+&6*
4+))'4+0) <
*'%- %%74#%: 4+))'4<.'8'. 14 *4'5*1.&  172.'& <
'05+6+8+6: &)' 4+))'4  172.'& <
Output Signal Ch cks 4Ć54....................................
*'%- 762765=  #0& #+0 #0& '.#:'& 4+))'4 ;
  #0&  10.: <
*'%- 41$' 1/2'05#614 762765 <
Option 05 Vid o Trigg r Ch cks 4Ć61..........................
*'%- +&'1 4+))'4 <
Adjustm nt Proc dur s
Adjustm nt Proc dur s 5Ć1......................................
G n ral Information 5Ć1......................................
!#4/<72 '4+1& <
%%'55 <
Equipm nt R quir m nts and Options 5Ć2....................
1/276'4 :56'/ #0& '4+2*'4#. '37+4'/'065 <

Table of Contents
Contents
iv
/3).-!+ %1)/(%1!+2 9
%23 04)/,%-3 9
Ad ustments 5Ć2.............................................
%1&.1,)-' 3(% $*423,%-32 9
.,/+%3% $*423,%-3 9
-$)5)$4!+ $*423,%-32 9
)'-!+ !3( .,/%-2!3).- 9
!13)!+ $*423,%-3 9
$*423,%-3 &3%1 %/!)1 9
$*423,%-3 %/%-$%-#)%2 9
Equipment Required 5Ć5.....................................
Ad ustment Instructions 5Ć7..................................
!1$6!1% -23!++!3).- 9
.&36!1% -23!++!3).- 9
.&36!1%9"!2%$ $*423,%-32 9
Probe Ad ustment 5Ć11........................................
.,/%-2!3% 3(% 1."% 9
%!241% 1."% !-$6)$3( 9
$*423 3(% 1."%: )'( 1%04%-#8 %2/.-2% 9
Display Assembly Ad ustment 5Ć19............................
1)'(3-%22 !-$ .-31!23 $*423,%-3
   !-$   .-.#(1.,%  -+8 9
.3!3).- 1)'(3-%22 !-$ .-31!23 $*423,%-3
   !-$   .+.1  -+8 9
Maintenance
Maintenance Information 6Ć1.....................................
Procedures Not In This Section 6Ć1...........................
Preventing Electrostatic Discharge (ESD) 6Ć2..................
1%#!43).-2 9
42#%/3)")+)38 3.  9
Inspection and Cleaning 6Ć5.....................................
General Care 6Ć5............................................
Inspection and Cleaning Procedures 6Ć5......................
-2/%#3).-: 73%1).1 9
+%!-)-' 1.#%$41%: 73%1).1 9
-2/%#3).-: -3%1).1 9
+%!-)-' 1.#%$41%: -3%1).1 9
4"1)#!3).- 9
Removal and Installation Procedures 6Ć9.........................
Preparation Ċ Please Read 6Ć9...............................
)23 .& .$4+%2 9
%-%1!+ -2314#3).-2 9

Table of Contents
TDS 520A, 524A, 540A, & 544A Service Manual v
4,,!17 .& 1.#%$41%2 8
Access Procedure 6Ć16.......................................
Procedures for External Modules 6Ć17.........................
1.-38!-%+ -."2 8
)-% 42% !-$ )-% .1$ 8
 !2*%32 8
%!1 .5%1 !-$ !")-%3 8
1.-3 .5%1 1), )-' %-4 433.-2 !-$ 33%-4!3.1
!-%+ 8
 1.-38!-%+ 22%,"+7 8
)2/+!781!,% 22%,"+7 8
!")-%3 .$4+%2 8
Procedures for OuterĆC assis Modules 6Ć31....................
 33%-4!3.1 22%,"+7 8
!- 8
  42 !-$ .6%1 !"+%2 8
 %1!1 .!1$ %-31.-)#2 !1$#./7 -3%1&!#% 8
 )$%. 1)''%1 .!1$ 8
 1.#%22.1)2/+!7 .!1$ 8
./ .5%1 !-$ .!1$ 1!#*%32 8
%!18!-%+ !"+%2 8
 #04)2)3).- .!1$ 8
+.//7 )2* 8
%!1 (!22)2 8
Procedures for InnerĆC assis Modules 6Ć51....................
 .6 .+3!'% .6%1 4//+7 8
 .1  )2/+!7 22%,"+7 !-$ 4//+7 42% 8
1.-3 4"/!-%+ 8
!)- (!22)2 8
Disassembly for Cleaning 6Ć60................................
Troubles ooting 6Ć63.............................................
TDS 520A, 524A, 540A, & 544A Diagnostics 6Ć63................
Firmware Updates 6Ć64.......................................