Teletype 43K001/AAA, Repair Manual

Page: 60 / 82

D
525, 4-8
C. CIRCUIT DIAGRAMS (Contd)
43K001/AAA KEYBOARD LOGIC
CIRCUIT NOTES: INFORMATION NOTES:
INFORMATION NOTES CONT.
101
102
103.
VOLTAGE
+5V
-121/
VOl TAC.E RANGE
+4.!) 10
5 5
-!0. 8 T0-13
2
I N TEGRATED C I R CUITS POWER CONNECTIONS:
TYPE DESIG
+5V LOGIC GAD.
TTL ILS) MLA2, A3 14
TTL
I
LS) MLBI,82,83 16
TTL MLAI 16
TTL MLA4 10
ROM
MLB4 16
•
(BIPOLAR)
SWITCH OPTIONS:
OFF
=
SWITCH OPEN
ON =SWITCH CLOSED
�o�"
DEPRESS SWITCH HERE I
c=::::J
g�S��]g�
��
g�OSE
2
c:::::::::J
(Q)
PARITY OPTION
*
SW-1 OF FIOPEN) PARITY DETECT ON EVEN
ON (CLOSED) PARITY DETECT OFF
tbl
SPEED SELECT
*
SW-2 OFF"(OPEN) 30 CHAR. PER SECOND
ONICLOSEOI
10
CHAR. PER SECOND
*
FACTORY FURNISHED STATE
201 All
RESISTORS
1/4 WATT AND VALUES
IN OHMS UNLESS OTHERWISE SP ECIFIED.
ALL CAPA CITORS VALUES IN MICROFARADS .
202 LOGIC DESIGNATION;
�
I /IC PIN NUMBER
I
CODE INDICATES LOCATION
ON CIRCUIT CARD
203. SWITCH PACK DESIGNATION:
SWITCH PACK LOCATION SWITCH NO.
S P
B�
SWI
2 0 4 . KEYSWI TCH
A NO
INDICATORS TERMINAL DESIG NATIONS;
IBOTTOM VIEW
I
CONTACT
l'C
1.0
(BOT T OM VIEW)
INDICATOR
205 INTEGRATED CIRCUITS- EXTERNAL VIEW AND
LEAD DESIGNATION:
206
VI EWEO FROM TOP
�
o
:; �
o
:�
3 12
3
14
4 I I 4 13
5 10
5
12
6
9 6 II
7
8 7 10
• 9
MLA2,A 3,A4
MLAI, 81,82 ,83,84
CONNECTOR INFORMATION P107
I
FEMALE PLUG):
PIN
NO.
2
3
4
5
6
1
•
9
10
I I
12
13
,.
15
16
17
,.
19
20
DESIGNATION
LOGIC GROUND
ALARM
SEND DATA
REPEAT
+5V
A UTO A NSWER
DATA
CLOCK
LOCAL
INTERLOCI<
KEY POSITION
CHARACTERS PER SECOND
PAINTER TEST
PARITY
INPUT OUTPUT
ST.O,RT CONT�OL
+ R4
5V
PRINTER
TEST SWITCH
ISSUE2D
:
OR LATER
IS S U E 2�
OR
LOCAL
EARLI[Jit
I
RESET
SWITCH
+5V
AI
6.1K
I
L
,
.
MLAI
9502
IS
C9
1.0
MLAI
teo2
'""
,
.
PRINTER TEST SWITCH
/RELEASED
�
�12mSEc ��msfc.
RESET SWITCH
DE PRESSED
......,. \
SfC.
1
!"�m uc.
••
1
ri.79U.
SEC.
!5.1k
.;.,a
RO
MLA4
7490
••
LOGIC
+
1
I
I
•
I
I
2
I
Cl
C
2
·'
+5V
+5V
-12\1
-