Tektronix 465B User Manual

Maintenance—
465B Service
e. P7052,
a
three-wire
connector
near top
center
of
Trigger
Generator
and Sweep
Logic
circuit board.
f.
Unsolder
the wires from
the
External Trigger
Input
connectors.
2.
Remove
POWER-switch-actuator
rod from
the
plastic
holder on the
switch. Pry rod
out of the
holder with
a
small
flat-bladed
screwdriver and
remove rod
from the
instrument.
3.
Remove
POWER switch
bracket from
the circuit
board
(3/16” wrench or
nutdriver
required).
The white
plastic
circuit board
support on
back side of board
mayfall
off
when circuit
board
hold-down screws are
removed;
save
it for
reinstallation.
4. Remove
five circuit
board
hold-down
screws
(Phillips
screwdriver required) from
the board (two at
rear,
two at front,
and one in a
post at top
center of the
board).
Also
remove post
(3/16"
wrench or
nutdriver
required).
5.
Unplug
Trigger Generator
and Sweep
Logic
circuit
board by prying
Trigger board away
from Interface
board
at the two
white
interboard
connectors (at bottom
edge of
the Trigger
board).
6. Move
Trigger
board to the
rear
until Trigger
switches clear
the front
casting to remove
the assembly
from the
instrument. Exercise
caution to
avoid damaging
the
connector
pins on
the Interface board.
7. To
reinstall the Trigger
Generator
and Sweep Logic
circuit board,
reverse
the order of the
removal steps.
If
indexing of the
Trigger
switches was
disturbed, a
series
of
alignment steps
will be required to
return
the indexing to
its correct
position.
After each
adjustment to
the switch
positioning,
the
board must be
reinstalled
tocheckoutthe
switch
operation.
SWEEP
TIMING
CIRCUIT
BOARD. Remove
and
replace this
board as
follows:
1.
Disconnect the
following wires:
a.
P6014, a
two-wire
connector (to
main cable
harness).
b.
P6002, a
three-wire
connector (to
DELAY
TIME
POSITION
potentiometer).
c.
P6001,
a four-wire
connector
(to X10
MAG
and
UNCAL LED).
2.
Remove
VAR
TlMt/UlV, A
TIME/Div,
and B
TIME/DIV knobs
(1/16”
and
5/64"
Allen
wrenches re-
quired).
The VAR
knob has one
externally
accessible
Allen
setscrew,
and the
large gray
knob has two
externally
accessible
Allen setscrews.
The clear
plastic skirt knob
has two
Allen
setscrews which
are
accessiblefrom
behind
the front panel
casting. Black
spacing
rings may fall
out;
save them
for
reinstallation.
3.
Remove
the board
hold-down screw
and the
hex-
agonal rod from
the Sweep
Timing circuit
board (Phillips
screwdriver and
3/16" wrench or nutdriver
required).
4.
Use a
flat-blade screwdriver to pry
the
Timing board
away
from the
Interface
board. Gently
pull away the
corner of the
Interface board
near the B
External
Trigger
input connector
and
simultaneously lift up
on the
Timing
board near the
reartofully
disengage
connector pi ns
from
the
Interface
board.
5.
To
reinstall
Timing board,
reverse the
order of the
removal steps.
VERTICAL
OUTPUT
BOARD REMOVAL.
Remove and
replace this board
as follows:
1.
Unplug P4295,
a
six-wire
connector
at
thetop front
corner
of Vertical
Output board.
2.
Disconnect
two wires
from the crt
neck. (Use
long-
nose
pliers and
gently pull
connectors
from the
pins on the
crt
neck. Pull
straight away
from the
crt
neck to avoid
putting a side
strain
on the
metal-to-glass
neck-pin seal.)
3.
Unplug the
delay-line
terminal from the
top right
corner of the
board.
4.
Remove
the
integrated
circuit
mounting nut
from
main chassis.
Use a
1/4"
open-end
wrench
to
loosen the
nut.
5. Remove
two
circuit board
hold-down
screws along
the top
edge
of the
board and
remove
Vertical Output
circuit
board from
the
instrument.
Save the
nylon
posts
(located
behind front
edge of
board) for
reinstallation.
6.
To reinstall
Vertical
Output
circuit
board,
reverse
the
order of the
removal
steps.
5-15

Tektronix 465B Specifications

General

Brand	Tektronix
Model	465B
Category	Test Equipment
Language	English