Tektronix 465B User Manual

Maintenance
—465B
Service
e.
Unplug P1505,
an
eight-wire connector
near the
rear of the
Preamplifier
circuit
board.
5.
Remove 10
screws
from attenuator
covers (five
in
each
cover) and
lift covers from
attenuator
assemblies.
6. Unsolder
two resistors
that connect
from the Ver-
tical
Preamplifier circuit
board to
the Attenuator
boards.
7.
Remove six
circuit board
hold-down
screws from
the
Preamplifier
circuit
board and remove
board from
the
instrument.
8. To
replace the Vertical
Preamplifier
circuit board,
use the
reverse of the
removal steps.
VERTICAL
MODE
SWITCH
AND
ATTENUATORS.
Remove
and replace
these
assemblies as
follows:
1.
Loosen
front
setscrews
in the
Vertical POSITION
control shaft
couplers
and the VAR
VOLTS/DIV
control
shaft
couplers. Slide
shafts out
of
the
couplers and
remove
them
from the
instrument.
2.
Disconnect
INVERT and 20
MHz BW
LIMIT push-
button
extension
shafts
from
the
switch shafts. Insert
a
scribe or
similar tool
between the
end of the
white plastic
shaft
and the
inside of the
black plastic
extension
shaft,
then pry
gently. Extension shafts
will
snap back into
position when
reassembling.
3.
Loosen six
Vertical
Preamplifier board
hold-down
screws (do
not remove).
4. Remove
knobs
from the
VOLTS/DIV
switches.
Loosen
setscrews and
pull
to
remove (requires a
1/16"
Allen
wrench).
5.
Remove
the AC-GND-DC
lever
switch knobs by
pulling them
straight off.
6.
Unplug
both input
coupling
capacitors from
the
board.
Bend
capacitors out
of the
way, leaving
the
soldered
lead
attached.
7.
Remove four
nutssecuringtheattenuatorchassisto
the
instrument
front
casting
(1/4" nutdriver required).
8.
Disconnect the
following
wires and
connectors:
a. P5232,
a
three-wire
connector (to
the
Interface
circuit
board).
b.
P5236
and
P5235,
two-wire
connectors (to
the
VAR
VOLTS/DIV
potentiometers).
c. P5036,
a
six-wire
connector (to
the CH
1 and
CH 2
VOLTS/DIV
UNCAL LED
and the 20
MHz BW
LIMIT LED).
d.
P5001, an
eight-wire
connector at
rear of
Vertical
Mode
Switch circuit
board (to
the
Preamplifier
circuit
board).
e. P5056
and P5265,
three-wire
connectors (to the
Probe Coding
boards).
f.
Single
red lead near
the
stand-off post at
the rear
of the
Vertical
Mode Switch
circuit board.
9.
Remove
securing
screw and
hexagonal
stand-off
post
from the
rear of the
Vertical
Mode
Switch circuit
board.
10. Remove
Vertical
Mode
Switch circuit
board from
the
instrument.
11. To
reinstall
the Vertical
Mode
Switch
and
attenuators,
use the
reverse of the
removal
steps.
TRIGGER
GENERATOR
AND SWEEP
LOGIC BOARD.
Remove
and replace this
board as follows:
1.
Disconnect the
following cables
and wires:
a.
Eight
coaxial cables
from
component side of
the
Trigger
Generator
and Sweep
Logic circuit
board.
Make
note of
cable color
codes to
aid in
proper
installation when
reassembling.
b.
P7010
and P7305,
five-wire
connectors (to
the A
and B
TRIGGER SLOPE
controls).
c. P7204,
a
four-wire
connector (to
TRIG
and
READY
LED). Guide
the
connector
through the
slotted
hole when
removing
the
circuit board.
d. P7105,
a
two-wire
connector
(to
POWER LED).

Tektronix 465B Specifications

General

Brand	Tektronix
Model	465B
Category	Test Equipment
Language	English