Teletype 43K001/AAA, Repair Manual

Page: 56 / 82

525, 4-4
C. CIRCUIT DIAGRAMS
AND CAB KEYBOARD LOGIC
6_
INFORMATION N'JTES:
201. ALL R£SIS TANC£ "VALUES IN OHMS UNLESS
O THERWISE. SPECtH£0.
202. ALL CAPACIT ANCE
oN
MICROFARADS UNLESS
204. INTEGRATED CIRCUITS-EXTERNAL VtEW AND LEAD
DESIGNATION :
43KIOI/CAA AND CAB
205. CONNECTOR TERMINATION
ION CIRCUIT CARD):
A
O
TM
E
RW
I
I£
SPECIFIED.
B
G
203. KEYSWITCH AND INDI CATO�S TERMINAL DESIGNATIONS:
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COff"T
�
BASIC
{BOTTOM VIEW)
��
I
NORMAlLY
I CLOSED)z
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3
INDICATOR
u. SEC.
'0'.
2 13
3 12
4 I I
•
10
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7 •
MLM,BI ,82 ,83
28
27
28
2.
24
23
22
21
2 0
19
II
II
12 1 7
,.
,
.
MLAI, A5, AI, 84
NOT PRESENT
ON
I SSU E lA
CLOCK GENERATION ANO DRIVERS
ov
1 �
8.93
USEC.
"1
t·lEc.
KEYSWITCH LOGIC AND
SENSE AMPLIFIERS
- 8V
R22
680K
C8
,
,.0
+IZV
SENSE AMP I
SENSE
AMP 2
SENSE AMP 3
SENSE AMP
r------ 4,53
m SEC-�
5U
S EC
�
.�ru S£C.
DATA ENABLE
1 PULSE
1ST DEPRESSION
KEY DEPRESSED
POR
I N
tO
II
l2
12
13
0
w
MLA5
KEYSWITCH
LOGIC
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.,.
uo
R31
1.5K
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G
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=
R32
1.5K
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CRO
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