Bell System Practices Plant 33 ASR Manual page 2

SECTION 580-301-200
(2) Grasp top of rear panel and lift it up to
disengage panel from stand.
35 ASR TTY
(1) Remove the chad container by sliding it
to the left, raising the right side, and slid-
ing it to the right.
(2) Operate the two pushbutton fasteners lo-
cated at the top of the lower compartment
panel.
(3) Depress the spring clip underneath the
keyboard and pivot the lower compart-
ment panel to the :floor.
(4) Disengage the panel from pivot screws and
remove panel.
35 RO TTY
(1) Same as the 35 ASR TTY with the ex-
ception that only one pushbutton fastener
is used to hold the lower compartment panel
and no chad container -is provided.
35 ROTR TTY
Note: The data set and DAS 820B2 are not
mounted in the 35 ROTR TTY stand ( due
to space limitation) when a 35 ROTR TTY
is used as a primary data station. A KS-20018
type cabinet is required. In addition, DAS
804R3 is mounted on the door of the stand.
(1) Apply outward pressure at the top rear
of the KS-20018 type cabinet panel until
the catches disengage.
(2) Lift the panel up to remove it from
framework.
2.04
Verify that the proper circuit packs (CP)
are installed in DAS 820Bl or 820B2
(Fig.
1) and that tlie R and CS switches are positioned
properly according to the service order and/or
worksheet.
Note 1: An option in DAS 820Bl or 820B2
is the encoding of the shift register on CP
AR37.
Note 2: For 33 ASR or 33 RO TTY, posi-
tion DAS 820Bl or 820B2 in the mainte-
nance position as follows:
Page2
(1) Rotate latch counterclockwise
(Fig.
2).
This allows DAS 820Bl or 820B2 to
pivot on the 91A bracket.
(2) With both hands placed on the rear
of the data auxiliary set, gently pull
the top towards the rear of the station as
shown in Fig. 3.
2.05
Remove lock strip (card-retaining bar) by
loosening the two screws holding it to the
apparatus mounting. Slide lock strip from be-
neath screws to remove lock strip.
2.06
Using the 7 48A tool assembly ( card-ex-
tracting tool), remove CP AR37 from DAS
820Bl or 820B2 (Fig. 1) as follows:
(1) Place pivots of 748A on faceplate of CP
and gently push 7 48A until pivots engage
faceplate.
(2) Grasp handle of 748A and pull CP AR37
straight out.
2.07
Inspect shift register
(Fig.
4). A properly
encoded CP AR37 shift register should
have three 24 - 28 gauge insulated wires run-
ning through each of the eight tubes.
2.08
In the event that the shift register
is
not encoded, ref er to the section entitled
No. I Electronic Switching System ADF,
Half-Duplex-100 Word Per Minute
Data Station Using 4-Row Teletype-
writers, Maintenance (580-301-300).
Replace CP AR37 as follows :
(1) Insert CP AR37 in slot 13.
(2) Verify that CP AR37 is seated properly
in its connector.
(3) Remove the 748A tool assembly by spring-
ing the bottom pivot down to disengage
pivot from CP faceplate.
(4) Lift up 748A to disengage top pivot.
2.09
Installation of the 33-type TTY should
be in accordance with the section entitled
32 and 33 Teletypewriter Set, Installation
(574-100-201) with the following exceptions: