Shaft-Knob Removal; Cathode Ray Tube (Crt) Removal - Tektronix 455 Instruction Manual

Maintenance— 455/A2/B2
/
Fig. 5-4. Shaft-knot removal.

Shaft-Knob Removal

1. Grip knob end with one hand and shaft end with other
hand.
2. Pull on knob, while pushing on shaft, to free recessed
portion of shaft from retainer bushing (see Fig. 5-4). Some
shaft-knobs may require considerable force to remove.

Cathode Ray Tube (Crt) Removal

W A R N I N G
Handle c rt carefully. Rough handling o r scratch­
ing can cause c r t to implode.
TO REMOVE CRT:
1. Remove Vertical Module (see instructions in Vertical
Module Maintenance section).
5-6
RETAINER:
BUSHING :
\
RECESSED
PORTION OF
SHAFT
BUSHING EXPANDS;
AS SHAFT-KNOB ;
IS REMOVED
:
1907-42
2. Remove plastic bezel and filte r from front of crt (held
with 4 screws).
3. Unplug crt anode lead and discharge to chassis.
4. Unplug c rt base socket.
5. Disconnect 2 vertical deflection plate leads from left side
of c rt neck.
6. Disconnect 2 horizontal deflection plate leads from
bottom of crt neck.
7. Hold crt face in one hand and slowly push c rt base with
other hand.
8. Carefully pull crt out of shield.
;
TO IN STA LL CRT:
1. Remove horizontal deflection plate leads from Interface
board and plug them onto crt horizontal deflection plate
pins.
2. Carefully insert crt into shield. Before pushing crt com­
pletely in place, pull horizontal deflection plate leads through
hole in bottom o f shield w ith tweezers or long-nose pliers.
3. Connect horizontal deflection plate leads to Interface
board.
4. Connect vertical deflection plate leads.
5. Connect c rt base socket and anode lead.
6. Install filte r and bezel.
REV. A, O C T 1975