Tektronix T921 - Page 75

NOTE
Although it maybe convenient, it is notnecessary to
remove any front panel or subpanel controls or
parts . The foregoing steps will allow the front of the
crt to be moved to the right of its normal position
while slightly bending the plastic subpanel to allow
clearance for the crt to be pulled forward out of its
shield
.
9 . Gently press forward on the-crt base, supporting the
front of the crt, until the front extends far enough forward
to grasp . Pull the crt the rest of the way out of its shield .
10 . To install a new crt, reverse the above procedure .
COMPONENT REPLACEMENT (T922R)
Vertical Module Replacement
1 . Remove right handle . It is held onby two screws on
the back of the front panel .
2 . Lift the plastic mask and light filter away from the crt
to remove .
REV . A JUL 1977
CH 2
FRONT REAR
SWITCH BOARD
CH 1
ATTEN
HORIZONTAL BOARD
UNDER VERT BOARD
VERTICAL AMP
BOARD
CH 1 FRONT REAR
SWITCH BOARD
EXT TRIG FRONTREAR
SWITCH BOARD BELOW
CH 1 FRONTREAR SWITCH
BOARD
Service
Information-T921/T922/T922R
3 . Remove the four screws holding the bezel . Remove
the bezel
.
4 . Remove the front panel and the plastic module
surrounding it .
5 . Make note of their location to aid reassembly, then
disconnect :
P4 connector
6 . Remove three screws (see Fig . 5-10) . Remove vertical
module by sliding it forward slightly, lifting the rear to
clear the power supply, then sliding it back and out of the
instrument .
Horizontal Module Replacement
1 . Remove the vertical module . See preceding instruc-
tions .
POWER
SUPPLY
BOARD
Three vertical input harmonica connectors (3 pin)
from FRONT-REAR switch
boards .
INTERFACE
BOARD
Fig . 5-9 . T922R circuit board locations (shown with bottom of instrument
facing upward) .
1982-55
5- 1 7