Removal and Installation Procedures
TDS 520A, 524A, 540A, & 544A Service Manual
6Ć53
A20 or A30 Display Assembly and Supply Fuse
NOTE
The display and the displayĆdriver board are a single module and
must be removed and replaced as such. They are listed as a single
module in the !+'!'! ,.- %-. A20 refers to the TDS 520A
and 540A monochrome module. A30 refers to the TDS 524A and
544A color module.
Assemble equipment and locate modules to be removed: 0! $) 3
-,!1 ,%0!, 1%.$ -%4! 5 *,2R .%+ .!(- ) *.! .$!
(* /'!- .* ! ,!(*0! %) .$! '*.*, %#,( InnerĆChassis Modules
%#/,! 5 +#! 5
Orient the oscilloscope: !. .$! *-%''*-*+! -* %.- *..*( %- *1) *) .$!
1*,& -/,"! ) %.- ,!, %- "%)# 3*/
Remove the highĆvoltage fuse: " 3*/ ,! -!,0%%)# .$%- "/-! ,!(*0! .$!
"/-! ",*( %.- "/-! $*' !, !0!,-! .$! +,*! /,! .* ,!%)-.''
WARNING
Display tube handling: Use care when handling a display tube. If
you break a display tube it may implode, scattering glass fragments
with high velocity and possibly injuring you. Wear protective
clothing, including safety glasses (preferably a fullĆface shield).
Avoiding striking the display tube with or against any object.
Display tube storage: Store the display tube face down in a
protected location, placing it on a soft, nonabrasive surface to
prevent scratching the face plate.
Remove the display tube:
&! .$! +,!/.%*)- */.'%)! %) .$! 1,)%)# *0! !"!,!)! %#5
/,!5 ) *, %#/,! 5
) 1$%'! *%)# .$! "*''*1%)# -/-.!+-
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.$! & *" .$! %-+'3 ./! ) .$! %-+'3 ./! 3*&! *))!.*,
",*( .$! %-+'3 %,/%. *, ) **-!) .$!
-,!1 *) .$! 0% !* *, .$. $*' - .$! -*&!.- $!) +/'' &
*) .$! 0% !* *, -'%#$.'3 $%- -!+,.!- .$! *, ",*( .$! -*&!.
*, .$! ) )+'/# .$! %-+'3 ./! *))!.*, ",*(
.$! & *" .$! %-+'3 ./! ) .$! %-+'3 ./! 3*&! *))!.*,
",*( .$! %-+'3 %,/%. *,
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