Tektronix 465B User Manual

Maintenance—465B Service
MAIN
INTERFACE BOARD REMOVAL.
It repair IS
necessary on reverse side
of the Main Interface
board, it is
possible
to gain access to that area
by removal of one
or
two circuit boards as previously outlined. Consider
this
first before proceeding
with Main Interface board
removal
procedure. (There is no reason
to remove
the Main
Interface
board except for exchange.)
II the Main Interface
board becomes
defective,
it
is
recommended
that
your local
Tektronix Field Office
or representative
be contacted to arrange
instru-
ment
repair at a Tektronix Service
Center.
The Main Interface
board can be removed
as follows:
1.
Remove Trigger Generator and
Sweep Logic board
as previously outlined.
2.
Position
the instrument with the front
to your right
and
the Interface board facing
you.
3.
Remove
the high-voltage shield from
Interface
board.
4.
Remove BEAM FIND and X10
MAG push-button
extension
shafts. Insert a scribe or small
screwdriver
between the end
of
the
white plastic switch shaft and the
inside of the black plastic extension
shaft, then pry gently.
5.
Remove INTENSITY,
FOCUS, SCALE ILLUM,
ASTIG,
and TRACE ROTATION control extension
shafts.
Loosen front setscrew in each coupli
ng
with a
0.050"
Allen
wrench.
6.
Disconnect
twelve
ribbon-
or wire-cable connectors
from Main Interface board and note the
location, quantity,
and
color
of wires for each plug for reassambly
reference:
a.
P4009,
a three-wire connector
at the top left
corner of
the
board
(to Q14009).
b. P4035, a four-wire connector near
top
center
of
the
board (to crt socket).
c.
P4069, a two-wire connector near
the INTEN-
SITY
potentiometer at top center of the
board (to the
Fan
board).
d. P4057, a three-wire connector near the INTEN-
SITY potentiometer at top center of the
board (to
Vertical Mode Switch).
e.
P4utn, a tnree-wire connector near the in
l
en-
SITY potentiometer at top center
of the board (to
Vertical Preamp
board).
f.
P4058,
a six-wire connector near the INTENSITY
potentiometer
at top
center
of the board (to Vertical
Output board).
g.
P4086, a two-wire connector near
Q4190 (to
graticule lights).
h.
P41
65,
a two-wire connector
near the front of the
INTENSITY potentiometer (Y-Axis).
i.
P4176, a
two-wire connector near the TRACE
ROTATION potentiometer
(to
crt).
j.
P4398, a six-wire connector from the TRACE SEP
and B INTENSITY potentiometers,
at the front of the
board.
k. P4498,
a
six-wire connector from
the
TRACE
SEP
and
HOLDOFF potentiometers,
at
the front
of
the
board.
I. P4561, a three-wire connector near
the bottom
center of the board (from the HOLDOFF control).
7.
Unsolder the CALIBRATOR
loop from Main Inter-
face board.
8.
Unsolder five wires from Main Interface
board and
confirm each
wire's
color
and location in the following list
for reassembly reference (high-voltage wires to crt
socket):
a. Wire to the one-notch ceramic strip is white
with
a yellow stripe.
b. Wire to the
-2450
volts test point (TP4129)
is
white with a red stripe.
c.
Wire
to
center notch on the three-notch
ceramic
strip is white with an orange stripe.
d. Lowest of a pair of wires between
the
large
high-
voltage capacitors
is white with brown and yellow
stripes

Tektronix 465B Specifications

General

Brand	Tektronix
Model	465B
Category	Test Equipment
Language	English