Tektronix T921 User Manual

Service
Information-T921/T922/T922R
Interconnecting
Cable and Pin Connector Replace-
ment
The interconnecting cable assemblies
are factory
assembled . They consist of machine installed
pin connec-
tors
mounted in plastic holders . The plastic holders are
easily replaced
as individual items, but if the connectors
are faulty, the entire cable
should be replaced .
It is
possible for the pin connectors to become dislodg-
ed from the
plastic holders . If this happens, the connector
can be re-installed
as follows (see Fig . 5-5) :
1 . Bend grooved portion of holder away
from cable as
shown .
2 . Re-insert
connector into its hole in plug-in portion of
holder .
NOTE
Holder positions are numbered (number
one is
identified with
a triangle) .
3 . Bend grooved part
of holder so that connector is
inserted
into groove .
When plugging
connector holders onto board pins, be
sure to match triangle mark
on holder with triangle mark
on circuit board .
Shaft-Knob
Removal
1 . Grip knob end with
one hand and shaft end with other
hand .
CRIMPED SIDE
OF PIN CONNECTOR
FACES TOWARD
HINGED PORTION
OF
HOLDER
5- 1 2
Fig .
5-5 .
Pin
connector replacement .
2 . Pull on knob, while pushing on shaft, to free recessed
portion
of
shaft
from retainer bushing (see Fig . 5-6) . Some
shaft-knobs may require
considerable force to remove .
Attenuator Replacement
The bushing and shaft
may separate abruptly . To
avoid damage
to
the
potentiometer and circuit
board, or personal injury, grip
both pieces firmly
during shaft-knob removal . It may
be
helpful
to grip
the shaft with the tip of long-nose pliers and
use a
gentle rocking motion to separate the shaft from the
bushing
.
Vertical Amplifier Replacement
To remove the
Vertical Amplifier from the instrument :
1 . Support the Vertical Amplifier,
while removing the
retaining screws . One is between
the attenuators and the
other two are in the lower corners .
2 . Disconnect P4 (see Fig . 5-7) from the Interface
board
by lifting the
entire Vertical Amplifier . Be careful not to
bend the pins .
To replace the Vertical Amplifier,
reverse the above
procedure
.
NOTE
The front
panel, switches, delay line,
and
attenuators are
attached to the Vertical board .
To remove the attenuator from the
instrument :
1 . Remove
the POSITION switch knob and shaft
:
2 . Remove
the VOLTS/DIV VAR knob and shaft . To
remove the
shaft, loosen the set screws holding the
shaft
to the potentiometer
and pull the shaft out .
3 . Pull the VOLTS/DIV knob and shaft out
of the front
panel .
4 .
Remove the three retaining screws
from the
attenuator
shield and the hex nut behind the front panel
below the BNC
connector .
REV . B
APR 1977

Tektronix T921 Specifications

General

Brand	Tektronix
Model	T921
Category	Test Equipment
Language	English