Tektronix 5000 Series User Manual

C T921
,
T922 /
R ,
T932A
,
T935A
&
442
EXCESSIVE
OSCILLATIONS
IN
THE
100V
POWER
SUPPLY
Reference : Schematic 7 Power Supply
Serial Number : T921 B013300 & Below
T922 B028790
& Below
T922R BO13204 & Below
T932A
B021865 &
Below
T935A BO22992 & Below
442
BO22915 &
Below
The 100
volt supply
may
start to
oscillate
after
the
instrument
warms
up .
The oscillations are from 1 to 2 MHz and may cause double triggering .
The
trace may
also
show
oscillation , due
to the
100v supply
going out
of
regulation
.
(
Oscillations
can
be
either
med or
high
frequency
. )
To
prevent the
oscillations a
capacitor ,
C723
,
22pf
P / N
281-0511-00
,
is
added in
parallel
with
R722 on
the
power
supply
board .
--Mike
Laurens
58-511 , Ext . 7173
464 , 465 , 466 , 475 / A , 485 PRESS NUTS USED TO MOUNT REAR FEET
Reference :
Wizard's Workshop , Issue 8-26
The original article published on September 1 , 1978 was inadvertently left
out of the May 1980 master index . It also does not appear in the microfiche
Maintenance
Notes
.
The
information
is
repeated
here
to
refresh us
all on
this
problem
.
The press nut , mounted in the rear sub - panel of the chassis , which holds the
screws for the rear feet , can usually be replaced if knocked loose or damaged .
If the
old nut
or
part of the
nut
remains in the
hole
,
drive
it
out
using a
scribe or
other
pointed
tool .
Draw the new
press nut
into
place
,
using
a
screw and
several
washers
,
by
slowly
tightening
from
the
rear of the
scope
.
If the
hole in the
sub -
panel
has
been
deformed , a
small
amount of
glue
or
adhesive
may
have to be
used
around
the
press
nut
.
Except in
cases of
severe damage , this method will usually work .
The press aut part numbers
are listed below :
464 , 465 , 466 , 475 / A
P / N
129-0394-00
485
P / N 220-0429-00
Thanks to Bill
Stephenson and
Pat
Morrison of
Dallas
for
their
inputs
.
--Roy
Lindley
58-511 , Ext . 7173
C
-24
June
27 ,
1980
Issue 10-13

Tektronix 5000 Series Specifications

General

Brand	Tektronix
Model	5000 Series
Category	Test Equipment
Language	English