Tektronix TDS 520A - A29 Video Trigger Board

Removal and Installation Procedures
TDS 520A, 524A, 540A, & 544A Service Manual
6Ć37
A29 Video Trigger Board
Additional modules Removed:  #53 ".% ".",/(;".% %*(*4",;0/7&2 $"#,&3
 Assemble equipment and locate modules to be removed
" "6& )".%9 " 3$2&7%2*6&2 7*4) " 3*:& ; /28R 4*0 4&-3  ".% 
# /$"4& 4)& -/%5,&3 4/ #& 2&-/6&% *. 4)& ,/$"4/2 %*"(2"- OuterĆ
Chassis Modules *(52& ; 0"(& ;
$ / 4)& 02/$&%52&3 A14 D1 Bus and Power Cables ".% A23 SerPar
Board 4)"4 02&$&%& 4)*3 02/$&%52& 4/ 2&-/6& 4)/3& *4&-3 4 *3 not
.&$&33"29 4/ 05,, 4)&  #/"2% "33&-#,9 /54 &.4*2&,9 ./2 *3 *4 .&$&3;
3"29 4/ 2&-/6& 4)& $"#,& $/..&$4/2 '2/- 4)&  &2"2 #/"2% 4/ 4)&
 2/$&33/2*30,"9 #/"2%
 Orient the oscilloscope: &4 4)& /3$*,,/3$/0& 3/ *43 #/44/- *3 %/7. /. 4)&
7/2+ 352'"$& ".% *43 '2/.4 *3 '"$*.( 9/5
 Disconnect the fan from processor/display board: .0,5( 4)& '".3 0/7&2
$"#,& '2/- 
 Remove the processor/display board: *(52& ; 3)/73 4)&  *%&/
2*((&2 #/"2% /04*/.  *.34",,&% 3& *(52& ; "3 " (5*%& 7)*,&
%/*.( 4)& '/,,/7*.( 35#34&03
" !/2+*.( '2/- 4)& 2&"2 0".&, 2&-/6& 4)& 47/ 3$2&73 -/5.4*.( 4)&
3500/24 #2"$+&4 *. 4)& 2&"2 0".&, )&. ,*'4 *4 /54 '2/- 4)& 2&"2 0".&,
# *3$/..&$4 4)& 47/ 0/7&2 $"#,& $/..&$4/23 4)& ".",/(;0/7&2 ".%
%*(*4",;0/7&2 *.4&2$/..&$4 $"#,&3 '2/- 4)& 6*%&/ #/"2% $/..&$4/2
".% '2/- 4)& 02/$&33/2;%*30,"9 $*2$5*4 #/"2% $/..&$4/2 3&& .5-#&2
 /. *(52& ;
$ &-/6& /2 05,, ,//3& 4)&  /..&$4/2 #/"2% 3&& .5-#&2  /.
*(52& ;
% .0,5( 4)& $/"8 6*%&/ $"#,& 4)"4 $/..&$43 4)& 6*%&/ #/"2% 4/ 4)&
"$15*3*4*/. #/"2%3 3&& *(52& ;
& ,*%& #"$+ ".% ,*'4 50 4)& *%&/ 2*((&2 $*2$5*4 #/"2% 3&& *(52&
;.