U
2 GOA
U2GOB
SEGMENT
DECODER
FHOM
P
UIUO
5v
i
R2U4
RX<^>
S
S.GR
S.GIC
x
Z5B
E*T
SCAN
~
---
+
5V
U2GOD
+»v
U24C»B
U2GOC
UlfeOA
U2¾5
47-
m
F
R284
U2
37
U254
U2G7A
U2¾4
U24O
U25G
U2G7C
MS
P
U24IA
BOARD
display
tR-Bä,}
CR244
CLEAR
U245A
OVERFLOW
REGISTER.
P/O
AI MAIN BOARD
C
ounters
and
D
isplay
DC
502
A4 P20TSCTION
circuit
board
47
a
,
F
2OV
IO
VOLTS
(.USA)
5.Z
VOLTS
(REG,}
4'
SEE
PARTS
UST
FOR
EARLIER
VALUES
AND
SERIAL
NUMBER
RANGES
OF
PARTS
MARKED
WITH BLUE OUTLINE.
----------
X
DECI MAL
28B
P
oint
U2G2A
FROM
PIM
S
U222*
CRE«i)
OtoAS
P
(LE-
scaler
,
bd
+
5 VOLTS
(RE«.)
+
5
VOLTS
(REG)
4-S
VOLT«»
(REG,-)
U24IB
U25O
LEADING
ZERO
SUPPRESSION
U24GA
U
N
T
E
R
S
&
D
IS
P
L
A
Y
S
eries
P
ass
(
located
in
mainframe
)
U24GC
8_
4
UZ(,7F
ffo
az
display
B
oard
?2
CRMI
R.28ON
%oo
300
Q284
IGHT
OUTPUT
I¾B
^>
OVERFLOW
DISPLAY LEDs
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...