Teletype 43K001/AAA, Repair Manual

Page: 45 / 82

2. 50K122 UNITIZED KEYBOARD
Spacebar Mechanism
To remove the spacebar mechanism:
(a) With the spacebar in the undepressed
state, insert a small screwdriver into the
left side slot opening of the spacebar and exert
a slight counterclockwise twist of the screw­
driver while grasping the spacebar and pulling
upward (Fig. 38)�
SPACEBAR
KEYS�TCH
�RE
HOUSING
BAIL
Fig. 38--:-Spacebar Removal
(b) When the latching tab on the left slide is
twisted clear of its guide, the spacebar can
be pulled free of engagement from the guide
and wire bail.
(c) When the spacebar is removed, the wire
bail
can
be removed from its guide slots.
(Fig. 39).
GUIDE SLOTS
�RE
BAIL
Fig. 39-Wire Bail Removal
MANUAL 525, 3-13
(d) To
install
spacebar, insert the wire bail in
its guide slots and while engaging the
spacebar with its guide and the wire bail, push
down on the spacebar until the tab on the left
side latches into the guide. (Fig. 40)
(e) Check mechanical operation of the space­
bar
so
that it returns to its unoperated
position freely when depressed and released
slowly.
�RE
BAIL
SPACEBAR
GUIDE
Fig. 40-8pacebar Assembly
Keytops
To remove indicator keytop and indicator assem­
bly:
(a) Remove keytop by pulling up.
(b) Remove indicator lens by pulling up until
it releases.
(c) Remove lens holder by pulling up.
(d) Remove indicator assembly from housing
by pulling up.
In
reassembly insure the
terminal pins on the indicator assembly line up
with the
terminals
on the keyboard logic circuit
card.
INDICATOR
LENS
LENS
HOLDER
INDICATOR
ASSEMBLY
INDICATOR
CIRCUIT CARD
TERMINALS
Fig. 41-Indicator Keytop Removal