DC
502
4-10
PRE-SCALE
INPUT
J180
DIRECT
INPUT
+20
V
+5
V
>
-20 V>
DC
502 BLOCK DIAGRAM
SIGNAL-SHAPING
CIRCUIT
CR185
Q190 Q195
CR186
U190 Q198
CR187
U160C
CR188
A
STEERING
GATE
U160B
19B
7A25B
24B
LATCH
-----------------
O
A
11 \
SCAN
+8
CLOCK
COUNTER
U260A
—
<
•
—>
U262A
U260B
U262B
U260D
U263A
25A
TIME
SLOT
DECODER
19A,
20A, 20B, 21B
A
U265
J100
TRIGGER
LEVEL
■O
a
v
1-MHz
CLOCK
Y200
GATE
GENERATOR
GATE
U200A
U200C
J
U200B
U200D
U220A
U220B
U222A
U222B
LATCH
I
I
I
I
L
OPTIONAL
1-MHz
CLOCK
Y201
U201
REGULATED
SUPPLIES
"1
U300
U320
—J—£
0330
T" Q340
I______
I
I
I
I
I
DECADE
DIVIDER
UNITS
U209
U210
U211
U212
U213
U214
U215
.01
SEC
.1
SEC
1
SEC
IO SEC
CONTROL
SIGNALS
U230A
U246D
U230B
U230C
U230D
MEAS
INTER
SWITCH
S200
A
CLEAR
CLEAR
RESET
>■
>
>■
>
10° DCU
STORAGE
U165A
U165B
U167
U169
10
1
DCU
U235
103 DCU
U236
REGISTER
U250
U251
U252
U253
U254
U255
U256
103 DCU
U237
10
4
DCU
U238
10s DCU
U239
106
DCU
U240
A
OVERFLOW
REGISTER
U241A
U241B
Q242
OVERFLOW
RESET
4
BCD
OUTPUT LINES
v
6
TIME-SLOT
LINES
TSl_
TS
7
LEADING-ZERO
SUPPRESSION
&
DECIMAL POINT
LOCATION
U245B
U246A
U246B
U260C
U263B
INVERTERS
U246C
U267D
U267A
U267E
U267B
U267F
U267C
-0-
SEVEN
SEGMENT
DECODER
&
DRIVER
U270
n
7 segment
lines
DISPLAY
LED's
DS280
DS281
DS282
DS283
DS284
DS285
DS286
A
ANODE
VOLTAGE
ENABLE
Q280
Q281
Q282
Q283
Q284
Q285
Q286
B
L
O
C
K
D
IA
G
R
A
M
3-11
Summary of Contents for DC 502
Page 4: ...DC 502...
Page 24: ...39 39 Relocated on back of board SN B070000 REV MAY 1974...
Page 33: ...FIG 1 EXPLODED...